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Iliadi A, Zervou SK, Koletsi D, Schätzle M, Hiskia A, Eliades T, Eliades G. Surface alterations and compound release from aligner attachments in vitro. Eur J Orthod 2024; 46:cjae026. [PMID: 38884540 PMCID: PMC11181360 DOI: 10.1093/ejo/cjae026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/18/2024]
Abstract
AIM The aim of the present study was to assess the alterations in morphology, roughness, and composition of the surfaces of a conventional and a flowable composite attachment engaged with aligners, and to evaluate the release of resin monomers and their derivatives in an aqueous environment. METHODS Zirconia tooth-arch frames (n = 20) and corresponding thermoformed PET-G aligners with bonded attachments comprising two composite materials (universal-C and flowable-F) were fabricated. The morphological features (stereomicroscopy), roughness (optical profilometry), and surface composition (ATR-FTIR) of the attachments were examined before and after immersion in water. To simulate intraoral use, the aligners were removed and re-seated to the frames four times per day for a 7-day immersion period. After testing, the eluents were analyzed by LC-MS/MS targeting the compounds Bis-GMA, UDMA, 2-HEMA, TEGDMA and BPA and by LC-HRMS for suspect screening of the leached dental material compounds and their degradation products. RESULTS After testing, abrasion-induced defects were found on attachment surfaces such as scratches, marginal cracks, loss of surface texturing, and fractures. The morphological changes and debonding rate were greater in F. Comparisons (before-after testing) revealed a significantly lower Sc roughness parameter in F. The surface composition of the aligners after testing showed minor changes from the control, with insignificant differences in the degree of C = C conversion, except for few cases with strong evidence of hydrolytic degradation. Targeted analysis results revealed a significant difference in the compounds released between Days 1 and 7 in both materials. Insignificant differences were found when C was compared with F in both timeframes. Several degradation products were detected on Day 7, with a strong reduction in the concentration of the targeted compounds. CONCLUSIONS The use of aligners affects the surface characteristics and degradation rate of composite attachments in an aqueous environment, releasing monomers, and monomer hydrolysates within 1-week simulated use.
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Affiliation(s)
- Anna Iliadi
- Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Greece
- Faculty of Medicine and Health Technology, University of Tampere, Finland
| | - Sevasti-Kiriaki Zervou
- Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research ‘Demokritos’, Athens, Greece
| | - Despina Koletsi
- Clinic of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, Switzerland
- Meta-Research Innovation Center at Stanford (METRICS), Stanford University, CA, USA
| | - Marc Schätzle
- Clinic of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, Switzerland
| | - Anastasia Hiskia
- Photo-Catalytic Processes and Environmental Chemistry, Institute of Nanoscience and Nanotechnology, National Centre for Scientific Research ‘Demokritos’, Athens, Greece
| | - Theodore Eliades
- Clinic of Orthodontics and Pediatric Dentistry, Center for Dental Medicine, University of Zurich, Switzerland
| | - George Eliades
- Department of Biomaterials, School of Dentistry, National and Kapodistrian University of Athens, Greece
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Egle K, Dohle E, Hoffmann V, Salma I, Al-Maawi S, Ghanaati S, Dubnika A. Fucoidan/chitosan hydrogels as carrier for sustained delivery of platelet-rich fibrin containing bioactive molecules. Int J Biol Macromol 2024; 262:129651. [PMID: 38280707 DOI: 10.1016/j.ijbiomac.2024.129651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 01/29/2024]
Abstract
Platelet-rich fibrin (PRF), derived from human blood, rich in wound healing components, has drawbacks in direct injections, such as rapid matrix degradation and growth factor release. Marine polysaccharides, mimicking the human extracellular matrix, show promising potential in tissue engineering. In this study, we impregnated the self-assembled fucoidan/chitosan (FU_CS) hydrogels with PRF obtaining PRF/FU_CS hydrogels. Our objective was to analyze the properties of a hydrogel and the sustained release of growth factors from the hydrogel that incorporates PRF. The results of SEM and BET-BJH demonstrated the relatively porous nature of the FU_CS hydrogels. ELISA data showed that combining FU_CS hydrogel with PRF led to a gradual 7-day sustained release of growth factors (VEGF, EGF, IL-8, PDGF-BB, TGF-β1), compared to pure PRF. Histology confirmed ELISA data, demonstrating uniform PRF fibrin network distribution within the FU_CS hydrogel matrix. Furthermore, the FU_CS hydrogels revealed excellent cell viability. The results revealed that the PRF/FU_CS hydrogel has the potential to promote wound healing and tissue regeneration. This would be the first step in the search for improved growth factor release.
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Affiliation(s)
- Karina Egle
- Institute of Biomaterials and Bioengineering, Faculty of Natural Science and Technology, Riga Technical University, LV-1048 Riga, Latvia; Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1048 Riga, Latvia.
| | - Eva Dohle
- FORM, Frankfurt Oral Regenerative Medicine, Clinic for Maxillofacial and Plastic Surgery, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany
| | - Verena Hoffmann
- FORM, Frankfurt Oral Regenerative Medicine, Clinic for Maxillofacial and Plastic Surgery, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany
| | - Ilze Salma
- Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1048 Riga, Latvia; Institute of Stomatology, Riga Stradins University, LV-1007 Riga, Latvia
| | - Sarah Al-Maawi
- FORM, Frankfurt Oral Regenerative Medicine, Clinic for Maxillofacial and Plastic Surgery, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany
| | - Shahram Ghanaati
- FORM, Frankfurt Oral Regenerative Medicine, Clinic for Maxillofacial and Plastic Surgery, Johann Wolfgang Goethe University, 60590 Frankfurt am Main, Germany.
| | - Arita Dubnika
- Institute of Biomaterials and Bioengineering, Faculty of Natural Science and Technology, Riga Technical University, LV-1048 Riga, Latvia; Baltic Biomaterials Centre of Excellence, Headquarters at Riga Technical University, LV-1048 Riga, Latvia.
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3
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Martinez-Garcia A, Fink L, Bayarjargal L, Winkler B, Juarez-Arellano EA, Navarro-Mtz AK. Structural analysis of potato starch transformation during high-energy ball-milling: Oxygen and humidity content effects. Int J Biol Macromol 2024; 260:129579. [PMID: 38266852 DOI: 10.1016/j.ijbiomac.2024.129579] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2023] [Revised: 11/28/2023] [Accepted: 01/16/2024] [Indexed: 01/26/2024]
Abstract
High Energy Ball-Milling (HEBM) modifies starchs' granule morphology, physicochemical properties, and chemical structure. However, understanding how the HEBM changes the starch chemical structure is necessary to control these modifications. Therefore, this study aimed to investigate the changes in potato starch's long- and short-range molecular order during HEBM at different environmental conditions such as oxygen (Air) and humidity content. Due to the correlation between the starch modification and the energy supplied (Esupp) by the HEBM, Burgio's equation was used to calculate this energy. The starch transformation was followed by X-ray diffraction, Fourier Transform-Infrared Spectroscopy, and Raman spectroscopy. A Principal Component Analysis (PCA) was conducted to reduce the HEBM variables. PAC analysis demonstrated that the different oxygen-humidity conditions do not affect the HEBM of potato starch. Based on the starch chemical structure transformation correlated with Esupp during HEBM, four stages were observed: orientation, modification, mechanolysis, and over-destruction. It was identified for the first time that at low milling energy (<1.5 kJ/g, orientation stage), the glycosidic rings change their orientation, and starch-water interaction increases while the starch's organization reduces. Ergo, the potato starch could be more susceptible to chemical modifications during the first two stages.
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Affiliation(s)
- A Martinez-Garcia
- Centro de Investigaciones Científicas, Instituto de Química Aplicada, Universidad del Papaloapan, Circuito central 200, Col. Parque Industrial, C.P. 68301 Tuxtepec, Oax., Mexico
| | - L Fink
- Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, D-60438 Frankfurt a.M., Germany
| | - L Bayarjargal
- Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, D-60438 Frankfurt a.M., Germany
| | - B Winkler
- Institut für Geowissenschaften, Goethe-Universität Frankfurt, Altenhöferallee 1, D-60438 Frankfurt a.M., Germany
| | - E A Juarez-Arellano
- Centro de Investigaciones Científicas, Instituto de Química Aplicada, Universidad del Papaloapan, Circuito central 200, Col. Parque Industrial, C.P. 68301 Tuxtepec, Oax., Mexico
| | - A K Navarro-Mtz
- Centro de Investigaciones Científicas, Instituto de Biotecnología, Universidad del Papaloapan, Circuito central 200, Col. Parque Industrial, C.P. 68301 Tuxtepec, Oax., Mexico.
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4
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Mileti O, Mammolenti D, Baldino N, Lupi FR, Gabriele D. Starch films loaded with tannin: the study of rheological and physical properties. Int J Biol Macromol 2024; 254:127973. [PMID: 37944713 DOI: 10.1016/j.ijbiomac.2023.127973] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/17/2023] [Accepted: 11/06/2023] [Indexed: 11/10/2023]
Abstract
Recently, the research on innovative food packaging has been oriented toward biodegradable materials to lower the environmental impact generated by conventional plastics. The films often carry functional additives interacting with the matrix and modifying its physical properties. In this work tannin, a scarcely exploited active additive, was used to obtain potato starch-based films, and its content was optimized on the basis of mechanical and microscopic tests. Rheological measurements were adopted to evaluate the tannin-starch interaction and the microstructure of the film forming solutions (FFSs). Their thickness, color, thermal conductivity, elastic modulus (Eel), elongation at break (EAB), surface wettability and water solubility were evaluated. Furthermore, microstructure was investigated through Fourier-transform infrared spectroscopy (FTIR), polarized light (POM) and scanning electron microscopy (SEM). It was observed that all FFSs behave as weak gels and tannin addition weakens the gel structure and decreases the gelatinization temperature from about 60 °C to 57 °C. Plastic and deformable films (Eel = 1.96 MPa and EAB = 189 %) were obtained at low tannin fractions, whereas, at a higher concentration, stiffer films (Eel = 12 MPa and EAB = 10 %), with hydrophobic behavior were produced. Among the tested tannin fractions, an intermediate value of 1.7 % (w/w) was found to be promising for industrial purposes.
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Affiliation(s)
- Olga Mileti
- Department of Information, Modeling, Electronics and Systems (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy
| | - Domenico Mammolenti
- Department of Information, Modeling, Electronics and Systems (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy
| | - Noemi Baldino
- Department of Information, Modeling, Electronics and Systems (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy
| | - Francesca Romana Lupi
- Department of Information, Modeling, Electronics and Systems (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy.
| | - Domenico Gabriele
- Department of Information, Modeling, Electronics and Systems (D.I.M.E.S.), University of Calabria, Via P. Bucci, Cubo 39C, I-87036 Rende, CS, Italy
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Tsujimura M, Saito K, Ishikita H. Stretching vibrational frequencies and pK a differences in H-bond networks of protein environments. Biophys J 2023; 122:4336-4347. [PMID: 37838831 PMCID: PMC10722396 DOI: 10.1016/j.bpj.2023.10.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 08/22/2023] [Accepted: 10/12/2023] [Indexed: 10/16/2023] Open
Abstract
The experimentally measured stretching vibrational frequencies of O-D [νO-D(donor)] and C=O [νC=O(donor)] H-bond donor groups can provide valuable information about the H-bonds in proteins. Here, using a quantum mechanical/molecular mechanical approach, the relationship between these vibrational frequencies and the difference in pKa values between H-bond donor and acceptor groups [ΔpKa(donor … acceptor)] in bacteriorhodopsin and photoactive yellow protein environments was investigated. The results show that νO-D(donor) is correlated with ΔpKa(donor … acceptor), regardless of the specific protein environment. νC=O(donor) is also correlated with ΔpKa(donor … acceptor), although the correlation is weak because the C=O bond does not have a proton. Importantly, the shifts in νO-D(donor) and νC=O(donor) are not caused by changes in pKa(donor) alone, but rather by changes in ΔpKa(donor … acceptor). Specifically, a decrease in ΔpKa(donor … acceptor) can lead to proton release from the H-bond donor group toward the acceptor group, resulting in shifts in the vibrational frequencies of the protein environment. These findings suggest that changes in the stretching vibrational frequencies, in particular νO-D(donor), can be used to monitor proton transfer in protein environments.
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Affiliation(s)
- Masaki Tsujimura
- Department of Advanced Interdisciplinary Studies, The University of Tokyo, Meguro-ku, Tokyo, Japan.
| | - Keisuke Saito
- Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo, Japan; Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo, Japan
| | - Hiroshi Ishikita
- Department of Applied Chemistry, The University of Tokyo, Bunkyo-ku, Tokyo, Japan; Research Center for Advanced Science and Technology, The University of Tokyo, Meguro-ku, Tokyo, Japan.
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Fauzi AA, Fauza J, Suroto H, Parenrengi MA, Suryaningtyas W, Widiyanti P, Suroto NS, Utomo B, Wahid BDJ, Bella FR, Firda Y. An In Vitro Study of Chitosan-Coated Bovine Pericardium as a Dural Substitute Candidate. J Funct Biomater 2023; 14:488. [PMID: 37888153 PMCID: PMC10607121 DOI: 10.3390/jfb14100488] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 09/14/2023] [Accepted: 09/18/2023] [Indexed: 10/28/2023] Open
Abstract
Defects in the dura matter can be caused by head injury, and many cases require neurosurgeons to use artificial dura matter. Bovine pericardium is an option due to its abundant availability, adjustable size and characteristics, and because it has more collagen than porcine or equine pericardia. Nevertheless, the drawback of bovine pericardium is that it has a higher inflammatory effect than other synthetic dura matters. Chitosan has been shown to have a strong anti-inflammatory effect and has good tensile strength; thus, the idea was formulated to use chitosan as a coating for bovine pericardium. This study used decellularized bovine pericardial membranes with 0.5% sodium dodecyl sulphate and coatings containing chitosan at concentrations of 0.25%, 0.5%, 0.75%, and 1%. An FTIR test showed the presence of a C=N functional group as a bovine pericardium-chitosan bond. Morphological tests of the 0.25% and 0.5% chitosan concentrations showed standard pore sizes. The highest tensile strength percentage was shown by the membrane with a chitosan concentration of 1%. The highest degradation rate of the membrane was observed on the 7th and 14th days for 0.75% and 1% concentrations, and the lowest swelling ratio was observed for the 0.25% concentration. The highest level of cell viability was found for 0.75% chitosan. The bovine pericardium membrane with a 0.75% concentration chitosan coating was considered the optimal sample for use as artificial dura matter.
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Affiliation(s)
- Asra Al Fauzi
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Joandre Fauza
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Heri Suroto
- Department of Orthopedic and Traumatology, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia;
| | - Muhammad Arifin Parenrengi
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Wihasto Suryaningtyas
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Prihartini Widiyanti
- Biomedical Engineering Study Program, Department of Physic, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia; (P.W.); (Y.F.)
| | - Nur Setiawan Suroto
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Budi Utomo
- Department of Public Health, Faculty of Medicine, Universitas Airlangga, Surabaya 60115, Indonesia;
| | - Billy Dema Justia Wahid
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Fitria Renata Bella
- Department of Neurosurgery, Faculty of Medicine, Universitas Airlangga, Dr. Soetomo General Academic Hospital, Surabaya 60131, Indonesia; (J.F.); (M.A.P.); (W.S.); (N.S.S.); (B.D.J.W.); (F.R.B.)
| | - Yurituna Firda
- Biomedical Engineering Study Program, Department of Physic, Faculty of Science and Technology, Universitas Airlangga, Surabaya 60115, Indonesia; (P.W.); (Y.F.)
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Olivito F, Jagdale P, Oza G. Synthesis and Biodegradation Test of a New Polyether Polyurethane Foam Produced from PEG 400, L-Lysine Ethyl Ester Diisocyanate (L-LDI) and Bis-hydroxymethyl Furan (BHMF). TOXICS 2023; 11:698. [PMID: 37624203 PMCID: PMC10457969 DOI: 10.3390/toxics11080698] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/10/2023] [Accepted: 08/11/2023] [Indexed: 08/26/2023]
Abstract
In this paper we produced a bio-based polyether-polyurethane foam PU1 through the prepolymer method. The prepolymer was obtained by the reaction of PEG 400 with L-Lysine ethyl ester diisocyanate (L-LDI). The freshly prepared prepolymer was extended with 2,5-bis(hydroxymethyl)furan (BHMF) to produce the final polyurethane. The renewable chemical BHMF was produced through the chemical reduction of HMF by sodium borohydride. HMF was produced by a previously reported procedure from fructose using choline chloride and ytterbium triflate. To evaluate the degradation rate of the foam PU1, we tested the chemical stability by soaking it in a 10% sodium hydroxide solution. The weight loss was only 12% after 30 days. After that, we proved that enzymatic hydrolysis after 30 days using cholesterol esterase was more favoured than hydrolysis with NaOH, with a weight loss of 24%, probably due to the hydrophobic character of the PU1 and a better adhesion of the enzyme on the surface with respect to water. BHMF was proved to be of crucial importance for the enzymatic degradation assay at 37 °C in phosphate buffer solution, because it represents the breaking point inside the polyurethane chain. Soil burial degradation test was monitored for three months to evaluate whether the joint activity of sunlight, climate changes and microorganisms, including bacteria and fungi, could further increase the biodegradation. The unexpected weight loss after soil burial degradation test was 45% after three months. This paper highlights the potential of using sustainable resources to produce new biodegradable materials.
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Affiliation(s)
- Fabrizio Olivito
- Department of Chemistry and Chemical Technologies, University of Calabria, Via P. Bucci, Cubo 12C, 87036 Cosenza, Italy
| | - Pravin Jagdale
- Circular Carbon GmbH, Europaring 4, 94315 Straubing, Germany;
| | - Goldie Oza
- Centro de Investigación y Desarrollo Tecnológico en Electroquímica, Pedro Escobedo 76703, Mexico;
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Wang Q, Zhou FP, Tao DD, Wei JH, Cai R, Jiang YB. Amyloid peptide hydrogels via formation of coordination polymers with Ag + by its core peptide equipped with a C-cysteine. Chem Commun (Camb) 2023; 59:9599-9602. [PMID: 37461336 DOI: 10.1039/d3cc02076b] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/04/2023]
Abstract
We report that the core sequence of amyloid β (Aβ) peptide, KLVFF, when equipped with a C-terminal cysteine residue, exhibited an extremely low minimum hydrogelation concentration of 0.05 wt% in the presence of Ag+ in pH 5 buffer, with this concentration 2 orders of magnitude lower than that of the pentapeptide itself. The CD signal of the Ag+-L-KLVFFC hydrogel was observed to be sensitive to the early-stage aggregation of amyloid β peptide.
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Affiliation(s)
- Qian Wang
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
| | - Fu-Peng Zhou
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
| | - Dan-Dan Tao
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
| | - Jin-Hong Wei
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
| | - Rui Cai
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
| | - Yun-Bao Jiang
- Department of Chemistry, College of Chemistry and Chemical Engineering, The MOE Key Laboratory of Spectrochemical Analysis and Instrumentation, and iChEM, Xiamen University, Xiamen 361005, China.
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9
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Sit I, Fashina BT, Baldo AP, Leung K, Grassian VH, Ilgen AG. Formic and acetic acid p Ka values increase under nanoconfinement. RSC Adv 2023; 13:23147-23157. [PMID: 37533784 PMCID: PMC10390803 DOI: 10.1039/d2ra07944e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Accepted: 06/22/2023] [Indexed: 08/04/2023] Open
Abstract
Organic acids are prevalent in the environment and their acidity and the corresponding dissociation constants can change under varying environmental conditions. The impact of nanoconfinement (when acids are confined within nanometer-scale domains) on physicochemical properties of chemical species is poorly understood and is an emerging field of study. By combining infrared and Raman spectroscopies with molecular dynamics (MD) simulations, we quantified the effect of nanoconfinement in silica nanopores on one of the fundamental chemical reactions-the dissociation of organic acids. The pKa of formic and acetic acids confined within cylindrical silica nanopores with 4 nm diameters were measured. MD models were constructed to calculate the shifts in the pKa values of acetic acid nanoconfined within 1, 2, 3, and 4 nm silica slit pores. Both experiments and MD models indicate a decrease in the apparent acid dissociation constants (i.e., increase in the pKa values) when organic acids are nanoconfined. Therefore, nanoconfinement stabilizes the protonated species. We attribute this observation to (1) a decrease in the average dielectric response of nanoconfined aqueous solutions where charge screening may be decreased; or (2) an increase in proton concentration inside nanopores, which would shift the equilibrium towards the protonated form. Overall, the results of this study provide the first quantification of the pKa values for nanoconfined formic and acetic acids and pave the way for a unifying theory predicting the impact of nanoconfinement on acid-base chemistry.
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Affiliation(s)
- Izaac Sit
- Department of Nanoengineering, University of California San Diego La Jolla CA 92093 USA
| | - Bidemi T Fashina
- Geochemistry Department, Sandia National Laboratories Albuquerque NM 87123 USA
| | - Anthony P Baldo
- Geochemistry Department, Sandia National Laboratories Albuquerque NM 87123 USA
| | - Kevin Leung
- Geochemistry Department, Sandia National Laboratories Albuquerque NM 87123 USA
| | - Vicki H Grassian
- Department of Chemistry & Biochemistry, University of California San Diego La Jolla CA 92093 USA
| | - Anastasia G Ilgen
- Geochemistry Department, Sandia National Laboratories Albuquerque NM 87123 USA
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Hosseini-Shokouh S, Zhou J, Berger E, Lv ZP, Hong X, Virtanen V, Kordas K, Komsa HP. Highly Selective H 2S Gas Sensor Based on Ti 3C 2T x MXene-Organic Composites. ACS APPLIED MATERIALS & INTERFACES 2023; 15:7063-7073. [PMID: 36694305 PMCID: PMC9923678 DOI: 10.1021/acsami.2c19883] [Citation(s) in RCA: 12] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Cost-effective and high-performance H2S sensors are required for human health and environmental monitoring. 2D transition-metal carbides and nitrides (MXenes) are appealing candidates for gas sensing due to good conductivity and abundant surface functional groups but have been studied primarily for detecting NH3 and VOCs, with generally positive responses that are not highly selective to the target gases. Here, we report on a negative response of pristine Ti3C2Tx thin films for H2S gas sensing (in contrast to the other tested gases) and further optimization of the sensor performance using a composite of Ti3C2Tx flakes and conjugated polymers (poly[3,6-diamino-10-methylacridinium chloride-co-3,6-diaminoacridine-squaraine], PDS-Cl) with polar charged nitrogen. The composite, preserving the high selectivity of pristine Ti3C2Tx, exhibits an H2S sensing response of 2% at 5 ppm (a thirtyfold sensing enhancement) and a low limit of detection of 500 ppb. In addition, our density functional theory calculations indicate that the mixture of MXene surface functional groups needs to be taken into account to describe the sensing mechanism and the selectivity of the sensor in agreement with the experimental results. Thus, this report extends the application range of MXene-based composites to H2S sensors and deepens the understanding of their gas sensing mechanisms.
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Affiliation(s)
- Seyed
Hossein Hosseini-Shokouh
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014Oulu, Finland
| | - Jin Zhou
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014Oulu, Finland
| | - Ethan Berger
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014Oulu, Finland
| | - Zhong-Peng Lv
- Department
of Applied Physics, Aalto University, FIN-00076Aalto, Finland
| | - Xiaodan Hong
- Department
of Applied Physics, Aalto University, FIN-00076Aalto, Finland
| | - Vesa Virtanen
- Research
Unit of Medical Imaging, Physics and Technology, Faculty of Medicine, University of Oulu, Aapistie 5A, 90220Oulu, Finland
| | - Krisztian Kordas
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014Oulu, Finland
| | - Hannu-Pekka Komsa
- Microelectronics
Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, P.O. Box 4500, FIN-90014Oulu, Finland
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11
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Dash R, Kommu P, Kumari N, Bhattacharyya AS. Structural characterization of fillers of inorganic materials in bismaleimide resins. JOURNAL OF POLYMER ENGINEERING 2022. [DOI: 10.1515/polyeng-2022-0171] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract
Because of its dimensional stability, minimal shrinkage, chemical and fire resistance, good mechanical qualities and high resistance to a variety of solvents, acids and water, bismaleimide (BMI) thermosetting polymers are mostly employed in aerospace applications. Corrosion prevention has also been accomplished using BMI coating. The addition of inorganic materials like metal oxides can influence the properties of BMI as an inorganic–organic composite. Ferric chloride–bismaleimide (FeCl3–BMI) and titania–bismaleimide (TiO2–BMI) composites were synthesized. Fillers of inorganic compounds like MnO2, Ni (NO3)2·6H2O and Al2(SO4)3 were synthesized as well. The structural and crystalline configuration as well as physicochemical changes were thoroughly studied by XRD and Fourier transform infrared spectroscopy (FTIR).
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Affiliation(s)
- Ritambhara Dash
- Centre for Nanotechnology , Central University of Jharkhand , Ranchi 835 205 , India
| | - Parameshwar Kommu
- Centre for Nanotechnology , Central University of Jharkhand , Ranchi 835 205 , India
| | - Neha Kumari
- Centre of Excellence in Green and Efficient Energy Technology (CoE-GEET) , Central University of Jharkhand , Ranchi 835 205 , India
| | - Arnab S. Bhattacharyya
- Centre for Nanotechnology , Central University of Jharkhand , Ranchi 835 205 , India
- Centre of Excellence in Green and Efficient Energy Technology (CoE-GEET) , Central University of Jharkhand , Ranchi 835 205 , India
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12
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Liu Z, Ramakrishna S, Ahmed I, Rudd C, Liu X. Rheological, Surface Tension and Conductivity Insights on the Electrospinnability of Poly(lactic-co-glycolic acid)-hyaluronic Acid Solutions and Their Correlations with the Nanofiber Morphological Characteristics. Polymers (Basel) 2022; 14:polym14204411. [PMID: 36297989 PMCID: PMC9611082 DOI: 10.3390/polym14204411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 09/29/2022] [Accepted: 10/17/2022] [Indexed: 12/04/2022] Open
Abstract
In this study, solutions were prepared with fixed concentrations of hyaluronic acid (HA) but varied concentrations of poly (lactic-co-glycolic acid) (PLGA) to emphasize the effects of PLGA concentration and HA addition on solution properties and to further evaluate their electrospinning performance. The dependence of specific viscosity on PLGA concentration was studied to determine the concentration regimes and evaluate the critical concentration (Ce) for successful fiber generation. The Ce of PLGA solutions is 12.07% compared to 10.09% for PLGA-HA solutions. Blending with HA results in a lower concentration dependence and better consistency to the theoretical scaling mechanisms due to the additional topological constrains, which thus result in more chain entanglements. Solutions in semi-dilute entangled regimes show the crossover of complex moduli, verifying the stable and reliable entanglement network. Higher concentrations and HA addition both led to lower crossover frequencies and, thus, a longer relaxation time. The effects of a higher PLGA concentration and HA addition on the surface tension were not evident. However, the HA addition significantly improved the solution conductivity up to three times in the pure PLGA solutions due to its polyelectrolyte nature. Defect-free and uniform nanofibers were generated from 35% to 40% of the PLGA-HA solutions, yet fibers with bead-on-string structures were produced from all studied pure PLGA solutions. Such solution characteristics and parametric correlations can provide predictive insights on tailoring the morphological characteristics of nanofibers for specific applications.
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Affiliation(s)
- Ziqian Liu
- Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Ningbo China, Ningbo 315100, China
| | - Seeram Ramakrishna
- Department of Mechanical Engineering, National University of Singapore, Singapore 119077, Singapore
| | - Ifty Ahmed
- Department of Mechanical, Materials and Manufacturing Engineering, University of Nottingham, Nottingham NG7 2RD, UK
| | - Chris Rudd
- James Cook University Singapore, Singapore 387380, Singapore
| | - Xiaoling Liu
- Department of Mechanical, Materials and Manufacturing Engineering, The University of Nottingham Ningbo China, Ningbo 315100, China
- Correspondence:
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13
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Saito K, Xu T, Ishikita H. Correlation between C═O Stretching Vibrational Frequency and p Ka Shift of Carboxylic Acids. J Phys Chem B 2022; 126:4999-5006. [PMID: 35763701 PMCID: PMC9289881 DOI: 10.1021/acs.jpcb.2c02193] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2022]
Abstract
![]()
Identifying the pKa values of aspartic
acid (Asp) and glutamic acid (Glu) in active sites is essential for
understanding enzyme reaction mechanisms. In this study, we investigated
the correlation between the C=O stretching vibrational frequency
(νC=O) of protonated carboxylic acids and
the pKa values using density functional
theory calculations. In unsaturated carboxylic acids (e.g., benzoic
acid analogues), νC=O decreases as the pKa increases (the negative correlation), whereas
in saturated carboxylic acids (e.g., acetic acid analogues, Asp, and
Glu), νC=O increases as the pKa increases (the positive correlation) as long as the
structure of the H-bond network around the acid is identical. The
negative/positive correlation between νC=O and pKa can be rationalized by the presence
or absence of the C=C double bond. The pKa shift was estimated from the νC=O shift of Asp and Glu in proteins on the basis of the negative correlation
derived from benzoic acids. The previous estimations should be revisited
by using the positive correlation derived in this study, as demonstrated
by quantum mechanical/molecular mechanical calculations of νC=O and electrostatic calculations of pKa on a key Asp85 in the proton-transfer pathway of bacteriorhodopsin.
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Affiliation(s)
- Keisuke Saito
- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan.,Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
| | - Tianyang Xu
- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan
| | - Hiroshi Ishikita
- Department of Applied Chemistry, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8654, Japan.,Research Center for Advanced Science and Technology, The University of Tokyo, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8904, Japan
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14
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Bapolisi AM, Kielb P, Bekir M, Lehnen AC, Radon C, Laroque S, Wendler P, Müller-Werkmeister HM, Hartlieb M. Antimicrobial Polymers of Linear and Bottlebrush Architecture: Probing the Membrane Interaction and Physicochemical Properties. Macromol Rapid Commun 2022; 43:e2200288. [PMID: 35686622 DOI: 10.1002/marc.202200288] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Revised: 05/16/2022] [Indexed: 11/10/2022]
Abstract
Polymeric antimicrobial peptide mimics are a promising alternative for the future management of the daunting problems associated with antimicrobial resistance. However, the development of successful antimicrobial polymers (APs) requires careful control of factors such as amphiphilic balance, molecular weight, dispersity, sequence, and architecture. While most of the earlier developed APs focus on random linear copolymers, the development of APs with advanced architectures proves to be more potent. It is recently developed multivalent bottlebrush APs with improved antibacterial and hemocompatibility profiles, outperforming their linear counterparts. Understanding the rationale behind the outstanding biological activity of these newly developed antimicrobials is vital to further improving their performance. This work investigates the physicochemical properties governing the differences in activity between linear and bottlebrush architectures using various spectroscopic and microscopic techniques. Linear copolymers are more solvated, thermo-responsive, and possess facial amphiphilicity resulting in random aggregations when interacting with liposomes mimicking Escheria coli membranes. The bottlebrush copolymers adopt a more stable secondary conformation in aqueous solution in comparison to linear copolymers, conferring rapid and more specific binding mechanism to membranes. The advantageous physicochemical properties of the bottlebrush topology seem to be a determinant factor in the activity of these promising APs.
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Affiliation(s)
| | - Patrycja Kielb
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.,Institute of Physical and Theoretical Chemistry, University of Bonn, Wegelerstrasse 12, 53115, Bonn, Germany
| | - Marek Bekir
- Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany
| | - Anne-Catherine Lehnen
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.,Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany
| | - Christin Radon
- Institute of Biochemistry and Biology, Department of Biochemistry, University of Potsdam, Karl-Liebknecht Strasse 24-25, 14476, Potsdam, Germany
| | - Sophie Laroque
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany
| | - Petra Wendler
- Institute of Biochemistry and Biology, Department of Biochemistry, University of Potsdam, Karl-Liebknecht Strasse 24-25, 14476, Potsdam, Germany
| | | | - Matthias Hartlieb
- Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Straße 24-25, 14476, Potsdam, Germany.,Fraunhofer Institute for Applied Polymer Research (IAP), Geiselbergstraße 69, 14476, Potsdam, Germany
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15
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Lapresta-Fernández A, Nefeli Athanasopoulou E, Jacob Silva P, Pelin Güven Z, Stellacci F. Site-selective surface enhanced Raman scattering study of ligand exchange reactions on aggregated Ag nanocubes. J Colloid Interface Sci 2022; 616:110-120. [DOI: 10.1016/j.jcis.2022.02.051] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2021] [Revised: 01/19/2022] [Accepted: 02/12/2022] [Indexed: 01/07/2023]
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16
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Zhang W, Ye W, Wang Y, Yan Y. Microfluidic fabrication of tunable alginate-based microfibers for the stable immobilization of enzymes. Biotechnol J 2022; 17:e2200098. [PMID: 35544361 DOI: 10.1002/biot.202200098] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 04/24/2022] [Accepted: 05/07/2022] [Indexed: 11/11/2022]
Abstract
Immobilized enzymes have drawn extensive attention due to their enhanced stability, easy separation from reaction mixture, and prominent recyclability. Nevertheless, it is still an ongoing challenge to develop potent immobilization techniques which are capable of stable enzyme encapsulation, minimal loss of activity, and modulability for various enzymes and applications. Here, microfibers with tunable size and composition were fabricated using a home-made microfluidic device. These microfibers were able to efficiently encapsulate bovine serum albumin (BSA), glucose oxidase (GOx), and horseradish peroxidase (HRP). But the physically adsorbed enzymes readily diffused into the catalytic reaction system. The leakage of enzymes could be substantially inhibited by conjugating to polyacrylic acid (PAA) and incorporating into alginate-based microfibers, enabling stable immobilization, improved recyclability, and enhanced thermostability. In addition, GOx and HRP-loaded microfibers were fabricated under the optimized conditions for the visual detection of glucose using the cascade reaction of these enzymes, showing sensitive color change to glucose with concentration range of 0-2 mM. Due to the tunability and versatility, this microfluidic-based microfiber platform may provide a valuable approach to the enzyme immobilization for the cascade catalysis and diagnoses with multiple clinical markers. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Wen Zhang
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310034, China
| | - Wenbo Ye
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310034, China
| | - Yajun Wang
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310034, China
| | - Yunfeng Yan
- College of Biotechnology and Bioengineering, Zhejiang University of Technology, Hangzhou, 310034, China
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17
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Bayrakdar A, Mert S, Kasımoğulları R, Bangaru S, Manivannan P. Synthesis, spectroscopic (FT-IR and NMR), DFT and molecular docking studies of ethyl 1-(3-nitrophenyl)-5-phenyl-3-((4-(trifluoromethyl)phenyl)carbamoyl)-1H-pyrazole-4-carboxylate. RESEARCH ON CHEMICAL INTERMEDIATES 2022. [DOI: 10.1007/s11164-022-04681-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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18
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Koshti B, Kshtriya V, Naskar S, Narode H, Gour N. Controlled aggregation properties of single amino acids modified with protecting groups. NEW J CHEM 2022. [DOI: 10.1039/d1nj05172e] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
The self-assembling properties of single amino acids modified with protecting groups under controlled conditions of temperature and concentration are illustrated.
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Affiliation(s)
- Bharti Koshti
- Department of Chemistry, Indrashil University, Kadi, Mehsana, Gujarat, India
| | - Vivekshinh Kshtriya
- Department of Chemistry, Indrashil University, Kadi, Mehsana, Gujarat, India
| | - Soumick Naskar
- Department of Chemistry, Indrashil University, Kadi, Mehsana, Gujarat, India
| | - Hanuman Narode
- Department of Chemistry, Indrashil University, Kadi, Mehsana, Gujarat, India
| | - Nidhi Gour
- Department of Chemistry, Indrashil University, Kadi, Mehsana, Gujarat, India
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19
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Mukherjee D, Ahmed IA, Gai F. Site-Specific Interrogation of Protein Structure and Stability. Methods Mol Biol 2022; 2376:65-87. [PMID: 34845603 DOI: 10.1007/978-1-0716-1716-8_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
To execute their function or activity, proteins need to possess variability in local electrostatic environment, solvent accessibility, structure, and stability. However, assessing any protein property in a site-specific manner is not easy since native spectroscopic signals often lack the needed specificity. One strategy that overcomes this limitation is to use unnatural amino acids that exhibit distinct spectroscopic features. In this chapter, we describe several such unnatural amino acids (UAAs) and their respective applications in site-specific interrogation of protein structure and stability using standard biophysical methods, including circular dichroism (CD), infrared (IR), and fluorescence spectroscopies.
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Affiliation(s)
| | - Ismail A Ahmed
- Department of Biochemistry and Molecular Biophysics, University of Pennsylvania, Philadelphia, PA, USA
| | - Feng Gai
- Department of Chemistry, University of Pennsylvania, Philadelphia, PA, USA.
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20
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Thermoplastic starch blown films functionalized by plasticized nitrite blended with PBAT for superior oxygen barrier and active biodegradable meat packaging. Food Chem 2021; 374:131709. [PMID: 34875439 DOI: 10.1016/j.foodchem.2021.131709] [Citation(s) in RCA: 40] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2021] [Revised: 11/25/2021] [Accepted: 11/26/2021] [Indexed: 01/31/2023]
Abstract
Functional bioplastic packaging was produced from thermoplastic starch (TPS) with nitrite (1-5%) and polybutylene adipate terephthalate (PBAT) (PBAT/TPS at 30/70 and 40/60) via blown-film extrusion. TPS-nitrite interaction increased thermal destabilization and decreased α-relaxation temperature of TPS phase, indicating improved plasticization and disruption of starch granules. Nitrite modified C=O bonding of PBAT and improved compatibility with TPS networks, resulting in compact microstructures that reduced oxygen and water vapor permeability. Films containing nitrite showed up to 39.7% decrease (p≤0.05) in mechanical properties while effectively improving and stabilizing redness of vacuum-packaged pork during storage for 12 days. Nitrite release led to up to 0.66 ppm residual nitrite, which corresponded to formation of nitrosyl myoglobin (3.4-9.6 ppm), and effectively reduced total viable count, lactic acid bacteria and yeast and molds (p≤0.05). Stabilized lipid components also increased with increasing nitrite. Novel nitrite-containing biodegradable film enhanced functional properties and retained quality of packaged meat.
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21
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Xiong Q, Stupp SI, Schatz GC. Molecular Insight into the β-Sheet Twist and Related Morphology of Self-Assembled Peptide Amphiphile Ribbons. J Phys Chem Lett 2021; 12:11238-11244. [PMID: 34762436 DOI: 10.1021/acs.jpclett.1c03243] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Self-assembly of high-aspect-ratio filaments containing β-sheets has attracted much attention due to potential use in bioengineering and biomedicine. However, precisely predicting the assembled morphologies remains a grand challenge because of insufficient understanding of the self-assembly process. We employed an atomistic model to study the self-assembly of peptide amphiphiles (PAs) containing valine-glutamic acid (VE) dimeric repeats. By changing of the sequence length, the assembly morphology changes from flat ribbon to left-handed twisted ribbon, implying a relationship between β-sheet twist and strength of interstrand hydrogen bonds. The calculations are used to quantify this relationship including both magnitude and sign of the ribbon twist angle. Interestingly, a change in chirality is observed when we introduce the RGD epitope into the C-terminal of VE repeats, suggesting arginine and glycine's role in suppressing right-handed β-sheet formation. This study provides insight into the relationship between β-sheet twist and self-assembled nanostructures including a possible design rule for PA self-assembly.
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Affiliation(s)
- Qinsi Xiong
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Samuel I Stupp
- Department of Chemistry, Center for BioInspired Energy Science, and Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Materials Science and Engineering, Northwestern University, Evanston, Illinois 60208, United States
- Department of Medicine, Northwestern University, Chicago, Illinois 60611, United States
- Simpson Querrey Institute for BioNanotechnology, Northwestern University, Chicago, Illinois 60611, United States
| | - George C Schatz
- Department of Chemistry, Northwestern University, Evanston, Illinois 60208-3113, United States
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22
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Mix LT, Hara M, Fuzell J, Kumauchi M, Kaledhonkar S, Xie A, Hoff WD, Larsen DS. Not All Photoactive Yellow Proteins Are Built Alike: Surprises and Insights into Chromophore Photoisomerization, Protonation, and Thermal Reisomerization of the Photoactive Yellow Protein Isolated from Salinibacter ruber. J Am Chem Soc 2021; 143:19614-19628. [PMID: 34780163 DOI: 10.1021/jacs.1c08910] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We demonstrate that the Halorhodospira halophila (Hhal) photoactive yellow protein (PYP) is not representative of the greater PYP family. The photodynamics of the PYP isolated from Salinibacter ruber (Srub) is characterized with a comprehensive range of spectroscopic techniques including ultrafast transient absorption, photostationary light titrations, Fourier transform infrared, and cryokinetics spectroscopies. We demonstrate that the dark-adapted pG state consists of two subpopulations differing in the protonation state of the chromophore and that both are photoactive, with the protonated species undergoing excited-state proton transfer. However, the primary I0 photoproduct observed in the Hhal PYP photocycle is absent in the Srub PYP photodynamics, which indicates that this intermediate, while important in Hhal photodynamics, is not a critical intermediate in initiating all PYP photocycles. The excited-state lifetime of Srub PYP is the longest of any PYP resolved to date (∼30 ps), which we ascribe to the more constrained chromophore binding pocket of Srub PYP and the absence of the critical Arg52 residue found in Hhal PYP. The final stage of the Srub PYP photocycle involves the slowest known thermal dark reversion of a PYP (∼40 min vs 350 ms in Hhal PYP). This property allowed the characterization of a pH-dependent equilibrium between the light-adapted pB state with a protonated cis chromophore and a newly resolved pG' intermediate with a deprotonated cis chromophore and pG-like protein conformation. This result demonstates that protein conformational changes and chromophore deprotonation precede chromophore reisomerization during the thermal recovery of the PYP photocycle.
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Affiliation(s)
- L Tyler Mix
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Miwa Hara
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Jack Fuzell
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
| | - Masato Kumauchi
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Sandip Kaledhonkar
- Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Aihua Xie
- Department of Physics, Oklahoma State University, Stillwater, Oklahoma 74078, United States.,Center for Advanced Infrared Biology College of Arts and Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Wouter D Hoff
- Department of Microbiology and Molecular Genetics, Oklahoma State University, Stillwater, Oklahoma 74078, United States.,Center for Advanced Infrared Biology College of Arts and Sciences, Oklahoma State University, Stillwater, Oklahoma 74078, United States
| | - Delmar S Larsen
- Department of Chemistry, University of California, Davis, One Shields Avenue, Davis, California 95616, United States
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23
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Ravichandiran P, Prabakaran DS, Maroli N, Kim AR, Park BH, Han MK, Ramesh T, Ponpandian S, Yoo DJ. Mitochondria-targeted acridine-based dual-channel fluorescence chemosensor for detection of Sn 4+ and Cr 2O 72- ions in water and its application in discriminative detection of cancer cells. JOURNAL OF HAZARDOUS MATERIALS 2021; 419:126409. [PMID: 34171666 DOI: 10.1016/j.jhazmat.2021.126409] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 05/28/2021] [Accepted: 06/12/2021] [Indexed: 06/13/2023]
Abstract
The goal of the present work was to fabricate a new low-cost, easy-to-prepare, dual-channel fluorescence chemosensor comprised of acridine-diphenylacetyl moieties (NDA) to enable remarkable Sn4+ detection in water and biological medium. The resulting NDA-Sn4+ complex was utilized for the distinguished identification of Cr2O72- ions from other anions and biomolecules. These investigations involve the absorption, fluorescence, and electrochemical methods for the detection of Sn4+ and Cr2O72- ions in pure water. The mechanism for NDA-mediated Sn4+ detection was experimentally determined by FT-IR, NMR titrations, mass (ESI) analyses, and DFT calculations. The obtained results indicate that the NDA chemosensor possessed excellent performance characteristics including good water solubility and compatibility, quick response time (less than 10 s), high sensitivity (Sn4+ = 0.268 μM and Cr2O72- = 0.160 μM), and selectivity against coexisting metals, anions, amino acids, and peptides. The chemosensor NDA induced negligible toxicity in live cells and was successfully utilized as a biomarker for the tracking of Sn4+ in human normal and cancer cells. More importantly, NDA demonstrates distinguished recognition of Sn4+ in human cancer cells rather than in normal live cells. Additionally, NDA was shown to act as a mitochondria-targeted probe in FaDu cells.
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Affiliation(s)
- Palanisamy Ravichandiran
- R&D Education Center for Whole Life Cycle R&D of Fuel Cell Systems, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea; Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea.
| | - D S Prabakaran
- Department of Radiation Oncology, College of Medicine, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk 28644, Republic of Korea; Department of Biotechnology, Ayya Nadar Janaki Ammal College (Autonomous), Sivakasi, Srivilliputhur Main Road, Sivakasi 626124, Tamil Nadu, India
| | - Nikhil Maroli
- Center for Condensed Matter Theory, Department of Physics, Indian Institute of Science, Bangalore 560012, India
| | - Ae Rhan Kim
- Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea
| | - Byung-Hyun Park
- Department of Biochemistry, Jeonbuk National University Medical School, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
| | - Myung-Kwan Han
- Department of Microbiology, Jeonbuk National University Medical School, 567 Baekje-daero, Deokjin-gu, Jeonju-si, Jeollabuk-do 54896, Republic of Korea
| | - Thiyagarajan Ramesh
- Department of Basic Medical Sciences, College of Medicine, Prince Sattam Bin Abdulaziz University, Al-Kharj 11942, Saudi Arabia
| | - Samuel Ponpandian
- Department of Biotechnology, Ayya Nadar Janaki Ammal College (Autonomous), Sivakasi, Srivilliputhur Main Road, Sivakasi 626124, Tamil Nadu, India
| | - Dong Jin Yoo
- R&D Education Center for Whole Life Cycle R&D of Fuel Cell Systems, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea; Department of Life Science, Department of Energy Storage/Conversion Engineering of Graduate School, Hydrogen and Fuel Cell Research Center, Jeonbuk National University, Jeonju, Jeollabuk-do 54896, Republic of Korea.
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24
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Almotairy A, Almutairi M, Althobaiti A, Alyahya M, Sarabu S, Alzahrani A, Zhang F, Bandari S, Repka MA. Effect of pH Modifiers on the Solubility, Dissolution Rate, and Stability of Telmisartan Solid Dispersions Produced by Hot-melt Extrusion Technology. J Drug Deliv Sci Technol 2021; 65. [PMID: 34552669 DOI: 10.1016/j.jddst.2021.102674] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of the current study was to investigate the dual effect of an amorphous solid dispersion generated by hot melt extrusion and the addition of pH modifiers on the solubility and stability of telmisartan. Hydroxypropyl methylcellulose acetate succinate L grade was used as a polymeric carrier and recrystallization inhibitor, and meglumine, sodium carbonate, or Neusilin S2 were incorporated as pH modifiers to generate a desirable microenvironmental pH in the solid dispersions. Differential scanning calorimetry, powder X-ray diffraction, and Fourier transform infrared spectroscopy were incorporated to obtain the solid-state characterizations of telmisartan, and the results confirm a partial transformation of telmisartan to an amorphous state. An in vitro release study revealed that the transformation of telmisartan to an amorphous material improved its dissolution rate by 2-fold compared to pure drug and by up to 5-fold with the incorporation of pH modifiers. Results of the stability studies demonstrated that the samples have no significant degradation under accelerated stability conditions at 40 °C/75% RH.
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Affiliation(s)
- Ahmed Almotairy
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Pharmaceutics and Pharmaceutical Technology Department, College of Pharmacy Taibah University, Al Madinah AlMunawarah 30001, Saudi Arabia
| | - Mashan Almutairi
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Department of Pharmaceutics,College of Pharmacy, University of Hail, Hail, 81442, Saudi Arabia
| | - Abdulmajeed Althobaiti
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Mohammed Alyahya
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Department of Pharmaceutics, College of Pharmacy, King Saud University, Riyadh, 11451, Saudi Arabia
| | - Sandeep Sarabu
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Abdullah Alzahrani
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Feng Zhang
- College of Pharmacy, The University of Texas at Austin, TX, 78712, USA
| | - Suresh Bandari
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
| | - Michael A Repka
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, University, MS 38677, USA
- Pii Center for Pharmaceutical Technology, The University of Mississippi, University, MS 38677, USA
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25
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Veissi M, Maktabi S, Ramezani Z, Khosravi M. Highly Sensitive Fluorescence Assay of Enterotoxin A in Milk Using Carbon Quantum Dots as a Fluorophore. FOOD ANAL METHOD 2021. [DOI: 10.1007/s12161-021-02009-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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26
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Maiuolo L, Olivito F, Algieri V, Costanzo P, Jiritano A, Tallarida MA, Tursi A, Sposato C, Feo A, De Nino A. Synthesis, Characterization and Mechanical Properties of Novel Bio-Based Polyurethane Foams Using Cellulose-Derived Polyol for Chain Extension and Cellulose Citrate as a Thickener Additive. Polymers (Basel) 2021; 13:2802. [PMID: 34451341 PMCID: PMC8400649 DOI: 10.3390/polym13162802] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2021] [Revised: 08/09/2021] [Accepted: 08/16/2021] [Indexed: 01/21/2023] Open
Abstract
A novel series of bio-based polyurethane composite foams was prepared, employing a cellulose-derived polyol for chain extension and cellulose-citrate as a thickener additive. The utilized polyol was obtained from the reduction reaction of cellulose-derived bio-oil through the use of sodium borohydride and iodine. Primarily, we produced both rigid and flexible polyurethane foams through chain extension of the prepolymers. Secondly, we investigated the role of cellulose citrate as a polyurethane additive to improve the mechanical properties of the realized composite materials. The products were characterized by FT-IR spectroscopy and their morphologies were analysed by SEM. Mechanical tests were evaluated to open new perspectives towards different applications.
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Affiliation(s)
- Loredana Maiuolo
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Fabrizio Olivito
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Vincenzo Algieri
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Paola Costanzo
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Antonio Jiritano
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Matteo Antonio Tallarida
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Antonio Tursi
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
| | - Corradino Sposato
- ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Trisaia Research Centre, S.S. 106 Ionica, km 419 + 500, 75026 Rotondella, MT, Italy; (C.S.); (A.F.)
| | - Andrea Feo
- ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development, Trisaia Research Centre, S.S. 106 Ionica, km 419 + 500, 75026 Rotondella, MT, Italy; (C.S.); (A.F.)
| | - Antonio De Nino
- Department of Chemistry and Chemical Technologies, University of Calabria, 87036 Rende, CS, Italy; (V.A.); (P.C.); (A.J.); (M.A.T.); (A.T.)
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EVA Films Loaded with Layered Double Hydroxide (LDH) Modified with Methacrylic Anion: Effect of the Nanohybrid Filler on the Photodegradation Phenomena. Polymers (Basel) 2021; 13:polym13152525. [PMID: 34372126 PMCID: PMC8348014 DOI: 10.3390/polym13152525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/22/2021] [Accepted: 07/27/2021] [Indexed: 11/29/2022] Open
Abstract
The photo-oxidative studies of ethylene vinyl acetate copolymer (EVA) matrix, filled with Layered Double Hydroxide (LDH) modified with methacrylic anion (MA), were herein reported, together with gas permeation tests. The formulation of nano-hybrid LDHs was characterized using X-ray diffractometry (XRD) and thermogravimetric analysis (TGA), demonstrating the partial intercalation of the 30% of MA anion between the LDH’s galleries. The as-modified filler was introduced into an EVA matrix by mechanical milling, producing free-standing films subjected to accelerated aging. Fourier transform infrared spectroscopy (FT-IR) results suggested that the nanohybrid presence determined a stabilizing effect up to 45 days of UV irradiation, especially if compared to the EVA/LDH references for all formulated EVA hybrid nanocomposites. Conversely, the presence of nanohybrid in the matrix did not significantly change the thermal stability of EVA samples. The dispersion of modified MA-LDH in the EVA matrix produces defect-free samples in the whole range of investigated loadings. The samples show a slight decrease in gas permeability, coupled with a substantial stabilization of the original CO2/O2 selectivity, which also proves the integrity of the films after 30 days of UV irradiation.
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28
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Fellows AP, Casford MTL, Davies PB. Using hybrid atomic force microscopy and infrared spectroscopy (AFM-IR) to identify chemical components of the hair medulla on the nanoscale. J Microsc 2021; 284:189-202. [PMID: 34313326 DOI: 10.1111/jmi.13052] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2021] [Revised: 07/02/2021] [Accepted: 07/20/2021] [Indexed: 11/30/2022]
Abstract
Atomic force microscopy integrated with infrared spectroscopy (AFM-IR) has been used to topographically and chemically examine the medulla of human hair fibres with nanometre scale lateral resolution. The mapping of cross-sections of the medulla showed two distinct structural components which were subsequently characterised spectroscopically. One of these components was shown to be closely similar to cortical cell species, consistent with the fibrillar structures found in previous electron microscope (EM) investigations. The other component showed large chemical differences from cortical cells and was assigned to globular vacuole species, also confirming EM observations. Further characterisation of the two components was achieved through spectral deconvolution of the protein Amide-I and -II bands. This showed that the vacuoles have a greater proportion of the most thermodynamically stable conformation, namely the antiparallel β-sheet structures. This chimes with the observed lower cysteine concentration, indicating a lower proportion of restrictive disulphide cross-link bonding. Furthermore, the large α-helix presence within the vacuoles points to a loss of matrix-like material as well as significant intermolecular stabilisation of the protein structures. By analysing the carbonyl stretching region, it was established that the fibrillar, cortical cell-like components showed considerable stabilisation from H-bonding interactions, similar to the cortex, involving amino acid side chains whereas, in contrast, the vacuoles were found to only be stabilised significantly by structural lipids.
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Affiliation(s)
| | | | - Paul B Davies
- Department of Chemistry, University of Cambridge, Cambridge, UK
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29
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Encapsulation of hexanal in bio-based cyclodextrin metal organic framework for extended release. J INCL PHENOM MACRO 2021. [DOI: 10.1007/s10847-021-01095-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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30
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Kazanci M, Haciosmanoglu SK, Kamel G. Synchrotron Fourier transform infrared microspectroscopy (sFTIRM) analysis of unfolding behavior of electrospun collagen nanofibers. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 251:119420. [PMID: 33465575 DOI: 10.1016/j.saa.2020.119420] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2020] [Revised: 12/29/2020] [Accepted: 12/30/2020] [Indexed: 06/12/2023]
Abstract
Collagen nanofibers are popular extracellular matrix (ECM) materials in regenerative medicine. Electrospinning of collagen dissolved in organic solvents is widely used for fabricating anisotropic collagen nanofibers; however, such fibers are water-soluble and require cross-linking before use as scaffolds for cell culture. Herein, in-situ crosslinking during electrospinning process is suggested by using different chemical agents, namely genipin and glutaraldehyde, and physical crosslinking method (UV light). sFTIRM; Synchrotron Fourier-Transform Infrared Microspectroscopy is a powerful tool that sheds light on the molecular structure of collagen nanofibers. Applied extraction methods caused shifts on protein band positions. Electrospinning process prevents self-assembly of collagen molecules and obtained electrospun collagen nanofibers have lower band positions. Crosslinkers have effect on the secondary structure of collagen molecules. Among different crosslinkers, genipin in-situ crosslinking process perform better in preserving the native structure of electrospun collagen nanofibers than the physical crosslinking method (UV).
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Affiliation(s)
- Murat Kazanci
- Biomedical Engineering Department, School of Engineering and Natural Sciences, Istanbul Medeniyet University, 34700 Istanbul, Turkey; Nanoscience and Nanoengineering Program, Graduate School, Istanbul Medeniyet University, 34700 Istanbul, Turkey.
| | - Selcuk Kaan Haciosmanoglu
- Nanoscience and Nanoengineering Program, Graduate School, Istanbul Medeniyet University, 34700 Istanbul, Turkey
| | - Gihan Kamel
- SESAME Synchrotron (Synchrotron-light for Experimental Science and Applications in the Middle East), 19252 Allan, Jordan; Department of Physics, Faculty of Science, Helwan University, Cairo, Egypt.
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31
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Momeni S, Rezvani Ghomi E, Shakiba M, Shafiei-Navid S, Abdouss M, Bigham A, Khosravi F, Ahmadi Z, Faraji M, Abdouss H, Ramakrishna S. The Effect of Poly (Ethylene glycol) Emulation on the Degradation of PLA/Starch Composites. Polymers (Basel) 2021; 13:1019. [PMID: 33806074 PMCID: PMC8036416 DOI: 10.3390/polym13071019] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2021] [Revised: 03/22/2021] [Accepted: 03/23/2021] [Indexed: 02/07/2023] Open
Abstract
As a hydrophilic renewable polymer, starch has been widely used in biocompatible plastics as a filler for more than two decades. The present study aimed at investigating the effects of polyethylene glycol (PEG), as a plasticizer, on the physicochemical properties of a hybrid composite-polylactic acid (PLA) and thermoplastic starch (TPS). A solvent evaporation process was adopted to gelatinize the starch and disparate PEG contents ranging from 3 to 15 wt.% (with respect to the sample weight) were examined. It was revealed that the increase in the PEG content was accompanied by an increment in the starch gelatinization degree. Referring to the microstructural analyses, the TPS/PLA mixture yielded a ductile hybrid composite with a fine morphology and a uniform phase. Nevertheless, two different solvents, including acetone and ethanol, were used to assess if they had any effect on the hybrid's morphology, tensile strength and thermal properties. It was found that ethanol culminated in a porous hybrid composite with a finer morphology and better starch distribution in the PLA structure than acetone. As the result of PEG addition to the composite, the crystallinity and tensile strength were decreased, whereas the elongation increased. The hydrolytic degradation of samples was assessed under different pH and thermal conditions. Moreover, the microbial degradation of the PLA/TPS hybrid composite containing different PEG molar fractions was investigated in the soil for 45 days. The rate of degradation in both hydrolytic and biodegradation increased in the samples with a higher amount of PEG with ethanol solvent.
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Affiliation(s)
- Sarieh Momeni
- Department of Chemistry, Amirkabir University of Technology, Tehran 15875-4413, Iran; (S.M.); (Z.A.)
| | - Erfan Rezvani Ghomi
- Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, National University of Singapore, Singapore 117581, Singapore;
| | - Mohamadreza Shakiba
- Department of Chemistry, Amirkabir University of Technology, Tehran 15875-4413, Iran; (S.M.); (Z.A.)
| | - Saied Shafiei-Navid
- Department of Organic Chemistry, Faculty of Chemistry, University of Mazandaran, Babolsar 47416-95447, Iran;
| | - Majid Abdouss
- Department of Chemistry, Amirkabir University of Technology, Tehran 15875-4413, Iran; (S.M.); (Z.A.)
| | - Ashkan Bigham
- Institute of Polymers, Composites and Biomaterials—National Research Council (IPCB-CNR), Viale J.F. Kennedy 54—Mostra d’Oltremare pad. 20, 80125 Naples, Italy;
| | - Fatemeh Khosravi
- Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, National University of Singapore, Singapore 117581, Singapore;
| | - Zahed Ahmadi
- Department of Chemistry, Amirkabir University of Technology, Tehran 15875-4413, Iran; (S.M.); (Z.A.)
| | - Mehdi Faraji
- School of Chemistry, College of Science, University of Tehran, Tehran 14155-6455, Iran;
| | - Hamidreza Abdouss
- Department of Polymer, Amirkabir University of Technology, Tehran 15875-4413, Iran;
| | - Seeram Ramakrishna
- Center for Nanotechnology and Sustainability, Department of Mechanical Engineering, National University of Singapore, Singapore 117581, Singapore;
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32
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Barrera EE, Zonta F, Pantano S. Dissecting the role of glutamine in seeding peptide aggregation. Comput Struct Biotechnol J 2021; 19:1595-1602. [PMID: 33868596 PMCID: PMC8039506 DOI: 10.1016/j.csbj.2021.02.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2020] [Revised: 02/18/2021] [Accepted: 02/20/2021] [Indexed: 12/02/2022] Open
Abstract
Poly glutamine and glutamine-rich peptides play a central role in a plethora of pathological aggregation events. However, biophysical characterization of soluble oligomers -the most toxic species involved in these processes- remains elusive due to their structural heterogeneity and dynamical nature. Here, we exploit the high spatio-temporal resolution of coarse-grained simulations as a computational microscope to characterize the aggregation propensity and morphology of a series of polyglutamine and glutamine-rich peptides. Comparative analysis of ab-initio aggregation pinpointed a double role for glutamines. In the first phase, glutamines mediate seeding by pairing monomeric peptides, which serve as primers for higher-order nucleation. According to the glutamine content, these low molecular-weight oligomers may then proceed to create larger aggregates. Once within the aggregates, buried glutamines continue to play a role in their maturation by optimizing solvent-protected hydrogen bonds networks.
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Affiliation(s)
- Exequiel E. Barrera
- Instituto de Histología y Embriología (IHEM) - Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), CC56, Universidad Nacional de Cuyo (UNCuyo), Mendoza, Argentina
| | - Francesco Zonta
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
| | - Sergio Pantano
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai 201210, China
- Biomolecular Simulations Group, Institut Pasteur de Montevideo, Mataojo 2020, CP 11400 Montevideo, Uruguay
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33
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Zhorov BS. Possible Mechanism of Ion Selectivity in Eukaryotic Voltage-Gated Sodium Channels. J Phys Chem B 2021; 125:2074-2088. [DOI: 10.1021/acs.jpcb.0c11181] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Boris S. Zhorov
- Department of Biochemistry and Biomedical Sciences, McMaster University, Hamilton, Ontario L8K 4K1, Canada
- Sechenov Institute of Evolutionary Physiology and Biochemistry, Russian Academy of Sciences, St. Petersburg 194223, Russian Federation
- Almazov National Medical Research Centre, St. Petersburg 197341, Russian Federation
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Infrared nanospectroscopy reveals the molecular interaction fingerprint of an aggregation inhibitor with single Aβ42 oligomers. Nat Commun 2021; 12:688. [PMID: 33514697 PMCID: PMC7846799 DOI: 10.1038/s41467-020-20782-0] [Citation(s) in RCA: 43] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 12/01/2020] [Indexed: 12/12/2022] Open
Abstract
Significant efforts have been devoted in the last twenty years to developing compounds that can interfere with the aggregation pathways of proteins related to misfolding disorders, including Alzheimer’s and Parkinson’s diseases. However, no disease-modifying drug has become available for clinical use to date for these conditions. One of the main reasons for this failure is the incomplete knowledge of the molecular mechanisms underlying the process by which small molecules interact with protein aggregates and interfere with their aggregation pathways. Here, we leverage the single molecule morphological and chemical sensitivity of infrared nanospectroscopy to provide the first direct measurement of the structure and interaction between single Aβ42 oligomeric and fibrillar species and an aggregation inhibitor, bexarotene, which is able to prevent Aβ42 aggregation in vitro and reverses its neurotoxicity in cell and animal models of Alzheimer’s disease. Our results demonstrate that the carboxyl group of this compound interacts with Aβ42 aggregates through a single hydrogen bond. These results establish infrared nanospectroscopy as a powerful tool in structure-based drug discovery for protein misfolding diseases. Our understanding of the molecular mechanisms underlying pathological protein aggregation remains incomplete. Here, single molecule infrared nanospectroscopy (AFM-IR) offers insight into the structure of Aβ42 oligomeric and fibrillar species and their interaction with an aggregation inhibitor, paving the way for single molecule drug discovery studies.
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35
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Development of MWCNT decorated with green synthesized AgNps-based electrochemical sensor for highly sensitive detection of BPA. J APPL ELECTROCHEM 2021. [DOI: 10.1007/s10800-020-01511-3] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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36
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Kasmi N, Pinel C, Da Silva Perez D, Dieden R, Habibi Y. Synthesis and characterization of fully biobased polyesters with tunable branched architectures. Polym Chem 2021. [DOI: 10.1039/d0py01512a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A series of sugar-derived triols and biobased diacids were combined to prepare fully biobased branched polyesters with different structural features by melt polycondensation.
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Affiliation(s)
- Nejib Kasmi
- Department of Materials Research and Technology (MRT)
- Luxembourg Institute of Science and Technology (LIST)
- L-4362 Esch-sur-Alzette
- Luxembourg
| | | | | | - Reiner Dieden
- Department of Materials Research and Technology (MRT)
- Luxembourg Institute of Science and Technology (LIST)
- L-4362 Esch-sur-Alzette
- Luxembourg
| | - Youssef Habibi
- Department of Materials Research and Technology (MRT)
- Luxembourg Institute of Science and Technology (LIST)
- L-4362 Esch-sur-Alzette
- Luxembourg
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37
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Nanoporous Activated Carbon Derived via Pyrolysis Process of Spent Coffee: Structural Characterization. Investigation of Its Use for Hexavalent Chromium Removal. APPLIED SCIENCES-BASEL 2020. [DOI: 10.3390/app10248812] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Hexavalent chromium (Cr(VI)) is a heavy metal that is highly soluble and exhibits toxic effects on biological systems. Nevertheless, it is used in many industrial applications. The adsorption process of Cr(VI), using activated carbon (AC), is under investigation globally. On the other hand, around six million tons of spent coffee is sent to landfill annually. In the spirit of cyclic economy, this research investigated the production of AC from spent coffee for the removal of Cr(VI) from wastewater. The AC was produced via pyrolysis process under a nitrogen atmosphere. Chemical activation using potassium hydroxide (KOH) occurred simultaneously with the pyrolysis process. The produced AC was tested as an absorber of Cr(VI). The best fitted kinetic model was the diffusion–chemisorption model. A 24-h adsorption experiment was carried out using a solution with a pH of 3 and an initial Cr(VI) concentration of 54.14 ppm. This resulted in an experimental maximum capacity of 109 mg/g, while the theoretical prediction was 137 mg/g. It also resulted in an initial adsorption rate (ri) of 110 (mg/(g h)). The Brunauer–Emmett–Teller surface area (SgBET) was 1372 m2/g, the Langmuir surface area (SgLang.) was 1875 m2/g, and the corrugated pore structure model surface area (SgCPSM) was 1869 m2/g. The micropore volume was 84.6%, exhibiting micropores at Dmicro1 = 1.28 and Dmicro2 = 1.6 nm. The tortuosity factor (τ) was 4.65.
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38
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Wang Q, Guan X, Kang L, Wang B, Sheng L, Wang FR. Polyphenylene as an Active Support for Ru-Catalyzed Hydrogenolysis of 5-Hydroxymethylfurfural. ACS APPLIED MATERIALS & INTERFACES 2020; 12:53712-53718. [PMID: 33210901 DOI: 10.1021/acsami.0c11888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Selective transformation of biomass feedstocks to platform molecules is a key pursuit for sustainable chemical production. Compared to petrochemical processes, biomass transformation requires the defunctionalization of highly polar molecules at relatively low temperatures. As a result, catalysts based on functional organic polymers may play a prominent role. Targeting the hydrogenolysis of the platform chemical 5-hydroxymethylfurfural (5-HMF), here, we design a polyphenylene (PPhen) framework with purely sp2-hybridized carbons that can isolate 5-HMF via π-π stacking, preventing hemiacetal and humin formation. With good swellability, the PPhen framework here has successfully supported and dispersed seven types of metal particles via a newly developed swelling-impregnation method, including Ru, Pt, Au, Fe, Co, Ni, and Cu. Ru/PPhen is studied for 5-HMF hydrogenolysis, achieving a 92% yield of 2,5-dimethylfuran (DMF) under mild conditions, outperforming the state-of-the-art catalysts reported in the literature. In addition, PPhen helps perform a solventless reaction, achieving direct 5-HMF to DMF conversion in the absence of any liquid solvent or reagent. This approach in designing support-reactant/solvent/metal interactions will play an important role in surface catalysis.
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Affiliation(s)
- Qiming Wang
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
| | - Xuze Guan
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
| | - Liqun Kang
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
| | - Bolun Wang
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
| | - Lin Sheng
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
| | - Feng Ryan Wang
- Department of Chemical Engineering, University College London, Torrington Place, WC1E 7JE London, U.K
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39
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Long-term hydrolytic degradation study of polycaprolactone films and fibers grafted with poly(sodium styrene sulfonate): Mechanism study and cell response. Biointerphases 2020; 15:061006. [PMID: 33203213 DOI: 10.1116/6.0000429] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Polycaprolactone (PCL) is a widely used biodegradable polyester for tissue engineering applications when long-term degradation is preferred. In this article, we focused on the analysis of the hydrolytic degradation of virgin and bioactive poly(sodium styrene sulfonate) (pNaSS) functionalized PCL surfaces under simulated physiological conditions (phosphate buffer saline at 25 and 37 °C) for up to 120 weeks with the aim of applying bioactive PCL for ligament tissue engineering. Techniques used to characterize the bulk and surface degradation indicated that PCL was hydrolyzed by a bulk degradation mode with an accelerated degradation-three times increased rate constant-for pNaSS grafted PCL at 37 °C when compared to virgin PCL at 25 °C. The observed degradation mechanism is due to the pNaSS grafting process (oxidation and radical polymerization), which accelerated the degradation until 48 weeks, when a steady state is reached. The PCL surface was altered by pNaSS grafting, introducing hydrophilic sulfonate groups that increase the swelling and smoothing of the surface, which facilitated the degradation. After 48 weeks, pNaSS was largely removed from the surface, and the degradation of virgin and pNaSS grafted surfaces was similar. The cell response of primary fibroblast cells from sheep ligament was consistent with the surface analysis results: a better initial spreading of cells on pNaSS surfaces when compared to virgin surfaces and a tendency to become similar with degradation time. It is worthy to note that during the extended degradation process the surfaces were able to continue inducing better cell spreading and preserve their cell phenotype as shown by collagen gene expressions.
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Patel RD, Raval MK. Formulation of Diacerein Cocrystal Using β-Resorcylic Acid for Improvement of Physicomechanical and Biopharmaceutical Properties. Org Process Res Dev 2020. [DOI: 10.1021/acs.oprd.0c00298] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Rajeshri D. Patel
- Department of Pharmaceutical Sciences, Saurashtra University, Rajkot-360 005, Gujarat, India
| | - Mihir K. Raval
- Department of Pharmaceutical Sciences, Saurashtra University, Rajkot-360 005, Gujarat, India
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Hayami R, Ideno Y, Sato Y, Tsukagoshi H, Yamamoto K, Gunji T. Soluble ethane-bridged silsesquioxane polymer by hydrolysis–condensation of bis(trimethoxysilyl)ethane: characterization and mixing in organic polymers. JOURNAL OF POLYMER RESEARCH 2020. [DOI: 10.1007/s10965-020-02294-z] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Kaufmann JCD, Krause BS, Adam S, Ritter E, Schapiro I, Hegemann P, Bartl FJ. Modulation of Light Energy Transfer from Chromophore to Protein in the Channelrhodopsin ReaChR. Biophys J 2020; 119:705-716. [PMID: 32697975 DOI: 10.1016/j.bpj.2020.06.031] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2020] [Revised: 06/10/2020] [Accepted: 06/26/2020] [Indexed: 10/23/2022] Open
Abstract
The function of photoreceptors relies on efficient transfer of absorbed light energy from the chromophore to the protein to drive conformational changes that ultimately generate an output signal. In retinal-binding proteins, mainly two mechanisms exist to store the photon energy after photoisomerization: 1) conformational distortion of the prosthetic group retinal, and 2) charge separation between the protonated retinal Schiff base (RSBH+) and its counterion complex. Accordingly, energy transfer to the protein is achieved by chromophore relaxation and/or reduction of the charge separation in the RSBH+-counterion complex. Combining FTIR and UV-Vis spectroscopy along with molecular dynamics simulations, we show here for the widely used, red-activatable Volvox carteri channelrhodopsin-1 derivate ReaChR that energy storage and transfer into the protein depends on the protonation state of glutamic acid E163 (Ci1), one of the counterions of the RSBH+. Ci1 retains a pKa of 7.6 so that both its protonated and deprotonated forms equilibrate at physiological conditions. Protonation of Ci1 leads to a rigid hydrogen-bonding network in the active-site region. This stabilizes the distorted conformation of the retinal after photoactivation and decelerates energy transfer into the protein by impairing the release of the strain energy. In contrast, with deprotonated Ci1 or removal of the Ci1 glutamate side chain, the hydrogen-bonded system is less rigid, and energy transfer by chromophore relaxation is accelerated. Based on the hydrogen out-of-plane (HOOP) band decay kinetics, we determined the activation energy for these processes in dependence of the Ci1 protonation state.
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Affiliation(s)
- Joel C D Kaufmann
- Institut für Biologie, Biophysikalische Chemie, Humboldt-Universität zu Berlin, Berlin, Germany; Institut für Medizinische Physik und Biophysik, Charité Berlin, Berlin, Germany
| | - Benjamin S Krause
- Institut für Biologie, Experimentelle Biophysik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Suliman Adam
- Fritz Haber Center for Molecular Dynamics Research at the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Eglof Ritter
- Institut für Biologie, Biophysikalische Chemie, Humboldt-Universität zu Berlin, Berlin, Germany; Institut für Biologie, Experimentelle Biophysik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Igor Schapiro
- Fritz Haber Center for Molecular Dynamics Research at the Institute of Chemistry, The Hebrew University of Jerusalem, Jerusalem, Israel
| | - Peter Hegemann
- Institut für Biologie, Experimentelle Biophysik, Humboldt-Universität zu Berlin, Berlin, Germany
| | - Franz J Bartl
- Institut für Biologie, Biophysikalische Chemie, Humboldt-Universität zu Berlin, Berlin, Germany.
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43
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Electrochemical inspection of polypyrrole/chitosan/zinc oxide hybrid composites. J Appl Polym Sci 2020. [DOI: 10.1002/app.49561] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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On the Secondary Structure of Silk Fibroin Nanoparticles Obtained Using Ionic Liquids: An Infrared Spectroscopy Study. Polymers (Basel) 2020; 12:polym12061294. [PMID: 32516911 PMCID: PMC7361871 DOI: 10.3390/polym12061294] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 05/27/2020] [Accepted: 06/02/2020] [Indexed: 12/30/2022] Open
Abstract
Silk fibroin from Bombyx mori caterpillar is an outstanding biocompatible polymer for the production of biomaterials. Its impressive combination of strength, flexibility, and degradability are related to the protein’s secondary structure, which may be altered during the manufacture of the biomaterial. The present study looks at the silk fibroin secondary structure during nanoparticle production using ionic liquids and high-power ultrasound using novel infrared spectroscopic approaches. The infrared spectrum of silk fibroin fibers shows that they are composed of 58% β-sheet, 9% turns, and 33% irregular and/or turn-like structures. When fibroin was dissolved in ionic liquids, its amide I band resembled that of soluble silk and no β-sheet absorption was detected. Silk fibroin nanoparticles regenerated from the ionic liquid solution exhibited an amide I band that resembled that of the silk fibers but had a reduced β-sheet content and a corresponding higher content of turns, suggesting an incomplete turn-to-sheet transition during the regeneration process. Both the analysis of the experimental infrared spectrum and spectrum calculations suggest a particular type of β-sheet structure that was involved in this deficiency, whereas the two other types of β-sheet structure found in silk fibroin fibers were readily formed.
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Nguyen TN, Rangel A, Migonney V. Kinetic and degradation reactions of poly (sodium 4-styrene sulfonate) grafting “from” ozonized poly (ϵ-caprolactone) surfaces. Polym Degrad Stab 2020. [DOI: 10.1016/j.polymdegradstab.2020.109154] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Harris A, Lazaratos M, Siemers M, Watt E, Hoang A, Tomida S, Schubert L, Saita M, Heberle J, Furutani Y, Kandori H, Bondar AN, Brown LS. Mechanism of Inward Proton Transport in an Antarctic Microbial Rhodopsin. J Phys Chem B 2020; 124:4851-4872. [DOI: 10.1021/acs.jpcb.0c02767] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Andrew Harris
- Department of Physics, University of Guelph, 50 Stone Rd. E., Guelph, Ontario N1G 2W1, Canada
| | - Michalis Lazaratos
- Theoretical Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Malte Siemers
- Theoretical Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Ethan Watt
- Department of Physics, University of Guelph, 50 Stone Rd. E., Guelph, Ontario N1G 2W1, Canada
| | - Anh Hoang
- Department of Physics, University of Guelph, 50 Stone Rd. E., Guelph, Ontario N1G 2W1, Canada
| | - Sahoko Tomida
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Japan
| | - Luiz Schubert
- Experimental Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Mattia Saita
- Experimental Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Joachim Heberle
- Experimental Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Yuji Furutani
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Japan
| | - Hideki Kandori
- Department of Life Science and Applied Chemistry, Nagoya Institute of Technology, Showa-ku, Nagoya 466-8555, Japan
| | - Ana-Nicoleta Bondar
- Theoretical Molecular Biophysics Group, Department of Physics, Freie Universität Berlin, Arnimallee 14, D-14195 Berlin, Germany
| | - Leonid S. Brown
- Department of Physics, University of Guelph, 50 Stone Rd. E., Guelph, Ontario N1G 2W1, Canada
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Sloand JN, Nguyen TT, Zinck SA, Cook EC, Zimudzi TJ, Showalter SA, Glick AB, Simon JC, Medina SH. Ultrasound-Guided Cytosolic Protein Delivery via Transient Fluorous Masks. ACS NANO 2020; 14:4061-4073. [PMID: 32134630 DOI: 10.1021/acsnano.9b08745] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The inability to spatiotemporally guide proteins in tissues and efficiently deliver them into cells remains a key barrier to realizing their full potential in precision medicine. Here, we report ultrasound-sensitive fluoro-protein nanoemulsions which can be acoustically tracked, guided, and activated for on-demand cytosolic delivery of proteins, including antibodies, using clinically relevant diagnostic ultrasound. This advance is accessed through the discovery of a family of fluorous tags, or FTags, that transiently mask proteins to mediate their efficient dispersion into ultrasound-sensitive liquid perfluorocarbons, a phenomenon akin to dissolving an egg in liquid Teflon. We identify the biochemical basis for protein fluorous masking and confirm FTag coatings are shed during delivery, without disrupting the protein structure or function. Harnessing the ultrasound sensitivity of fluorous emulsions, real-time imaging is used to simultaneously monitor and activate FTag-protein complexes to enable controlled cytosolic antibody delivery in vitro and in vivo. These findings may advance the development of image-guided, protein-based biosensing and therapeutic modalities.
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Affiliation(s)
- Janna N Sloand
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Theodore T Nguyen
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Scott A Zinck
- Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Erik C Cook
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Tawanda J Zimudzi
- Materials Research Institute, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Scott A Showalter
- Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Adam B Glick
- Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Julianna C Simon
- Graduate Program in Acoustics, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
| | - Scott H Medina
- Department of Biomedical Engineering, The Pennsylvania State University, University Park, Pennsylvania 16802, United States
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Abstract
Infrared difference spectroscopy probes vibrational changes of proteins upon their perturbation. Compared with other spectroscopic methods, it stands out by its sensitivity to the protonation state, H-bonding, and the conformation of different groups in proteins, including the peptide backbone, amino acid side chains, internal water molecules, or cofactors. In particular, the detection of protonation and H-bonding changes in a time-resolved manner, not easily obtained by other techniques, is one of the most successful applications of IR difference spectroscopy. The present review deals with the use of perturbations designed to specifically change the protein between two (or more) functionally relevant states, a strategy often referred to as reaction-induced IR difference spectroscopy. In the first half of this contribution, I review the technique of reaction-induced IR difference spectroscopy of proteins, with special emphasis given to the preparation of suitable samples and their characterization, strategies for the perturbation of proteins, and methodologies for time-resolved measurements (from nanoseconds to minutes). The second half of this contribution focuses on the spectral interpretation. It starts by reviewing how changes in H-bonding, medium polarity, and vibrational coupling affect vibrational frequencies, intensities, and bandwidths. It is followed by band assignments, a crucial aspect mostly performed with the help of isotopic labeling and site-directed mutagenesis, and complemented by integration and interpretation of the results in the context of the studied protein, an aspect increasingly supported by spectral calculations. Selected examples from the literature, predominately but not exclusively from retinal proteins, are used to illustrate the topics covered in this review.
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Ultrafast Backbone Protonation in Channelrhodopsin-1 Captured by Polarization Resolved Fs Vis-pump-IR-Probe Spectroscopy and Computational Methods. Molecules 2020; 25:molecules25040848. [PMID: 32075128 PMCID: PMC7070883 DOI: 10.3390/molecules25040848] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 02/03/2020] [Accepted: 02/12/2020] [Indexed: 12/19/2022] Open
Abstract
Channelrhodopsins (ChR) are light-gated ion-channels heavily used in optogenetics. Upon light excitation an ultrafast all-trans to 13-cis isomerization of the retinal chromophore takes place. It is still uncertain by what means this reaction leads to further protein changes and channel conductivity. Channelrhodopsin-1 in Chlamydomonas augustae exhibits a 100 fs photoisomerization and a protonated counterion complex. By polarization resolved ultrafast spectroscopy in the mid-IR we show that the initial reaction of the retinal is accompanied by changes in the protein backbone and ultrafast protonation changes at the counterion complex comprising Asp299 and Glu169. In combination with homology modelling and quantum mechanics/molecular mechanics (QM/MM) geometry optimization we assign the protonation dynamics to ultrafast deprotonation of Glu169, and transient protonation of the Glu169 backbone, followed by a proton transfer from the backbone to the carboxylate group of Asp299 on a timescale of tens of picoseconds. The second proton transfer is not related to retinal dynamics and reflects pure protein changes in the first photoproduct. We assume these protein dynamics to be the first steps in a cascade of protein-wide changes resulting in channel conductivity.
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Shamsabadi AA, Isfahani AP, Salestan SK, Rahimpour A, Ghalei B, Sivaniah E, Soroush M. Pushing Rubbery Polymer Membranes To Be Economic for CO 2 Separation: Embedment with Ti 3C 2T x MXene Nanosheets. ACS APPLIED MATERIALS & INTERFACES 2020; 12:3984-3992. [PMID: 31874026 DOI: 10.1021/acsami.9b19960] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Sustainable and energy-efficient molecular separation requires membranes with high gas permeability and selectivity. This work reports excellent CO2 separation performance of self-standing and thin-film mixed matrix membranes (MMMs) fabricated by embedding 2D Ti3C2Tx MXene nanosheets in Pebax-1657. The CO2/N2 and CO2/H2 separation performances of the free-standing membranes are above Robeson's upper bounds, and the performances of the thin-film composite (TFC) membranes are in the target area for cost-efficient CO2 capture. Characterization and molecular dynamics simulation results suggest that the superior performances of the Pebax-Ti3C2Tx membranes are due to the formation of hydrogen bonds between Ti3C2Tx and Pebax chains, leading to the creation of the well-formed galleries of Ti3C2Tx nanosheets in the hard segments of the Pebax. The interfacial interactions and selective Ti3C2Tx nanochannels enable fast and selective CO2 transport. Enhancement of the transport properties of Pebax-2533 and polyurethane when embedded with Ti3C2Tx further supports these findings. The ease of fabrication and high separation performance of the new TFC membranes point to their great potential for energy-efficient CO2 separation with the low cost of $29/ton separated CO2.
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Affiliation(s)
- Ahmad Arabi Shamsabadi
- Department of Chemical and Biological Engineering , Drexel University , Philadelphia , Pennsylvania 19104 , United States
| | | | - Saeed Khoshhal Salestan
- Department of Chemical Engineering , Babol Noshirvani University of Technology , Babol 47148-71167 , Iran
| | - Ahmad Rahimpour
- Department of Chemical Engineering , Babol Noshirvani University of Technology , Babol 47148-71167 , Iran
| | - Behnam Ghalei
- Institute for Integrated Cell-Material Sciences (iCeMS) , Kyoto University , Kyoto 606-8504 , Japan
| | - Easan Sivaniah
- Institute for Integrated Cell-Material Sciences (iCeMS) , Kyoto University , Kyoto 606-8504 , Japan
| | - Masoud Soroush
- Department of Chemical and Biological Engineering , Drexel University , Philadelphia , Pennsylvania 19104 , United States
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