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Gómez S, Cappelli C. The Role of Hydrogen Bonding in the Raman Spectral Signals of Caffeine in Aqueous Solution. Molecules 2024; 29:3035. [PMID: 38998986 PMCID: PMC11243038 DOI: 10.3390/molecules29133035] [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: 06/06/2024] [Revised: 06/22/2024] [Accepted: 06/23/2024] [Indexed: 07/14/2024] Open
Abstract
The identification and quantification of caffeine is a common need in the food and pharmaceutical industries and lately also in the field of environmental science. For that purpose, Raman spectroscopy has been used as an analytical technique, but the interpretation of the spectra requires reliable and accurate computational protocols, especially as regards the Resonance Raman (RR) variant. Herein, caffeine solutions are sampled using Molecular Dynamics simulations. Upon quantification of the strength of the non-covalent intermolecular interactions such as hydrogen bonding between caffeine and water, UV-Vis, Raman, and RR spectra are computed. The results provide general insights into the hydrogen bonding role in mediating the Raman spectral signals of caffeine in aqueous solution. Also, by analyzing the dependence of RR enhancement on the absorption spectrum of caffeine, it is proposed that the sensitivity of the RR technique could be exploited at excitation wavelengths moderately far from 266 nm, yet achieving very low detection limits in the quantification caffeine content.
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Affiliation(s)
- Sara Gómez
- Scuola Normale Superiore, Classe di Scienze, Piazza dei Cavalieri 7, 56126 Pisa, Italy
| | - Chiara Cappelli
- Scuola Normale Superiore, Classe di Scienze, Piazza dei Cavalieri 7, 56126 Pisa, Italy
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2
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Hou X, Wang Y, Song X, Gao J, Ma Y. Biomimetic synthesis of single-crystalline anhydrous xanthine nanoplates in an aqueous solution with high reflectivity. SOFT MATTER 2024; 20:4422-4433. [PMID: 38775112 DOI: 10.1039/d4sm00165f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2024]
Abstract
Biogenic purine crystals can function in vision as light scatters, mirrors, and multilayer reflectors and produce structural colors or depolarization for camouflage. Xanthine crystals form irregular multifocal mirrors in the median ocellus of Archaeognatha. It is important to broaden the study of crystallization strategies to obtain organic crystals with purine rings in the laboratory. In this work, a facile one-step synthesis route to fabricate bio-inspired xanthine crystals is reported for the first time. The obtained rhomboidal xanthine nanoplates have similar morphology and size to biogenic xanthine crystals. Their length and thickness are about 2-4 μm and 50 nm, respectively. Lattice parameters, crystal structure, formation mechanism and optical properties of synthetic single-crystalline xanthine nanoplates were investigated in detail in this work. The obtained xanthine nanoplate crystals are proposed to be anhydrous xanthine with monoclinic symmetry, and the xanthine nanoplates mainly expose the (100) plane. It is proposed that the anhydrous xanthine nanoplates are formed via an amorphous xanthine intermediate precursor. The synthetic anhydrous xanthine nanoplates exhibit excellent optical properties, including high diffuse reflectivity, strong depolarization and pearlescent luster. This work provides a new design to synthesize bio-inspired organic molecular crystals with excellent optical properties.
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Affiliation(s)
- Xiubin Hou
- MOE Key Laboratory of Cluster Science, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Yingxia Wang
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
| | - Xinbing Song
- School of Physics, Beijing Institute of Technology, Beijing 100081, China.
| | - Juan Gao
- MOE Key Laboratory of Cluster Science, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
| | - Yurong Ma
- MOE Key Laboratory of Cluster Science, Key Laboratory of Medical Molecule Science and Pharmaceutical Engineering, School of Chemistry and Chemical Engineering, Beijing Institute of Technology, Beijing 100081, China.
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3
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Khalil LM, El-Refaie WM, Elnaggar YS, Abdelkader H, Al Fatease A, Abdallah OY. Non-invasive caffeinated-nanovesicles as adipocytes-targeted therapy for cellulite and localized fats. Int J Pharm X 2024; 7:100236. [PMID: 38524143 PMCID: PMC10958479 DOI: 10.1016/j.ijpx.2024.100236] [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: 12/02/2023] [Revised: 03/03/2024] [Accepted: 03/06/2024] [Indexed: 03/26/2024] Open
Abstract
Caffeine (CAF) is a non-selective adenosine A1 receptor antagonist which predominates in fat cells. When CAF binds to adenosine receptors, it increases cyclic adenosine monophosphate; inhibiting adipogenesis and inducing fat lipolysis. Resveratrol (RSV) is an antioxidant polyphenol possessing different anti-obesity mechanisms. Topical application of both hydrophilic CAF and lipophilic RSV is limited. This study aimed to develop novel caffeinated-resveratrol bilosomes (CRB) and caffeine-bilosomes (CB) that could non-invasively target and deposit in fat cells. RSV bilosomes (RB) were prepared as a non-targeted system for comparison. CRB showed nanosize (364.1 nm ±6.5 nm) and high entrapment for both active compounds. Rats treated topically with CRB revealed a significant decrease (P = 0.039) in body weight. Histological analysis of the excised skin demonstrated a reduction in the subcutaneous fatty layer thickness and a decrease in the size of connective tissue-imbedded fat cells. Kidney histological examination of RB-treated rats showed subcapsular tubular epithelial cells with cytoplasmic vacuolation. This reflects a systemic effect of RSV from the non-targeted RB compared to CRB, which had a targeting effect on the adipose tissue. In conclusion, CAF in CRB significantly enhanced RSV deposition in adipose tissue and assisted its local-acting effect for managing obesity and cellulite.
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Affiliation(s)
- Lobna M. Khalil
- Department of Pharmaceutics, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
| | - Wessam M. El-Refaie
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, Egypt
| | - Yosra S.R. Elnaggar
- Department of Pharmaceutics, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
- Department of Pharmaceutics and Pharmaceutical Technology, Faculty of Pharmacy, Pharos University in Alexandria, Alexandria, Egypt
| | - Hamdy Abdelkader
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 62223, Saudi Arabia
| | - Adel Al Fatease
- Department of Pharmaceutics, College of Pharmacy, King Khalid University, Abha 62223, Saudi Arabia
| | - Ossama Y. Abdallah
- Department of Pharmaceutics, Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
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Fu Q, Xie Y, Gao F, Zhu W, Lang X, Singh R, Zhang B, Kumar S. Signal-enhanced multi-core fiber-based WaveFlex biosensor for ultra-sensitive xanthine detection. OPTICS EXPRESS 2023; 31:43178-43197. [PMID: 38178418 DOI: 10.1364/oe.503443] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2023] [Accepted: 11/27/2023] [Indexed: 01/06/2024]
Abstract
In this work, we introduce a novel multimode fiber (MMF) - seven core fiber (SCF) - MMF (MCM) optical fiber biosensor, also known as the WaveFlex biosensor (plasma wave assisted fiber biosensor), based on localized surface plasmon resonance (LSPR) for qualitative detection of xanthine. Xanthine is a purine base widely distributed in human blood and tissues, and commonly used as an indicator for various disease detections. The MCM sensor incorporates a tapered optical fiber structure, fabricated using the combiner manufacturing system (CMS), and is designed with SCF and MMF. By effectively harnessing LSPR, the sensor boosts the attachment points of biomolecules on the probe surface through immobilized tungsten disulfide (WS2)-thin layers, gold nanoparticles (AuNPs), and carbon nitride quantum dots (C3N-QDs). The functionalization of xanthine oxidase (XO) on the sensing probe further enhances the sensor's specificity. The proposed WaveFlex biosensor exhibits a remarkable sensitivity of 3.2 nm/mM and a low detection limit of 96.75 µM within the linear detection range of 100 - 900 µM. Moreover, the sensor probe demonstrates excellent reusability, reproducibility, stability, and selectivity. With its sensitivity, biocompatibility, and immense potential for detecting human serum and fish products, this WaveFlex biosensor presents a promising platform for future applications.
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Guzmán-Armenteros TM, Ruales J, Cuesta-Plúa C, Bravo J, Sinche M, Vera E, Vera E, Vargas-Jentzsch P, Ciobotă V, Ortega-Ojeda FE, Proaño A, Echeverría A, Ramos-Guerrero L. Raman Spectroscopic and Sensory Evaluation of Cocoa Liquor Prepared with Ecuadorian Cocoa Beans Treated with Gamma Irradiation or Induced Electromagnetic Field Fermentation. Foods 2023; 12:3924. [PMID: 37959042 PMCID: PMC10647436 DOI: 10.3390/foods12213924] [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: 08/29/2023] [Revised: 09/19/2023] [Accepted: 09/26/2023] [Indexed: 11/15/2023] Open
Abstract
Cocoa liquor is the primary precursor of the worldwide highly appreciated commodity chocolate. Its quality depends on several factors, such as the type of cocoa, the fermentation process, and the control of the contaminants in the fermented beans. This study aims to evaluate whether the induced magnetic field treatment during the fermentation process or the pathogen reduction with gamma irradiation after the fermentation affect the characteristics of the cocoa liquor obtained from Ecuadorian cocoa beans. For this purpose, liquor samples from controls (standard process), from beans treated with an induced magnetic field up to 80 mT, and from beans irradiated with nominal doses up to 3 kGy were characterized through Raman spectroscopic analysis and sensorial evaluation. The most relevant bands of the cocoa liquor were assigned according to reports from the literature, spectroscopic data, and chemometrics. The spectra corresponding to different treatments and doses were visually very similar, but they could be discriminated using OPLS-DA models, where the most intense Raman signals were attributed to the lipid components. The sensorial evaluation rated the presence of floral, fruity, almondy, acid, and bitter flavors, along with astringency and intense aroma, and these attributes exhibited variable behavior depending on the dose of the irradiation or magnetic treatment. Therefore, both treatments may exert an influence on cocoa beans and, therefore, on the cocoa liquor quality.
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Affiliation(s)
- Tania María Guzmán-Armenteros
- Departamento de Ciencia de Alimentos y Biotecnología, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador; (T.M.G.-A.); (J.R.); (E.V.)
| | - Jenny Ruales
- Departamento de Ciencia de Alimentos y Biotecnología, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador; (T.M.G.-A.); (J.R.); (E.V.)
| | - Cristina Cuesta-Plúa
- Agencia de Regulación y Control Fito y Zoosanitario (AGROCALIDAD), Av. Interoceánica km 14 ½, Tumbaco 170184, Ecuador; (C.C.-P.); (J.B.)
| | - Juan Bravo
- Agencia de Regulación y Control Fito y Zoosanitario (AGROCALIDAD), Av. Interoceánica km 14 ½, Tumbaco 170184, Ecuador; (C.C.-P.); (J.B.)
| | - Marco Sinche
- Departamento de Ciencias Nucleares, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170525, Ecuador; (M.S.); (E.V.); (P.V.-J.)
| | - Edwin Vera
- Departamento de Ciencia de Alimentos y Biotecnología, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional (EPN), Quito 170525, Ecuador; (T.M.G.-A.); (J.R.); (E.V.)
| | - Edison Vera
- Departamento de Ciencias Nucleares, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170525, Ecuador; (M.S.); (E.V.); (P.V.-J.)
| | - Paul Vargas-Jentzsch
- Departamento de Ciencias Nucleares, Facultad de Ingeniería Química y Agroindustria, Escuela Politécnica Nacional, Ladrón de Guevara E11-253, Quito 170525, Ecuador; (M.S.); (E.V.); (P.V.-J.)
| | - Valerian Ciobotă
- Rigaku Analytical Devices, Inc., 30 Upton Drive, Suite 2, Wilmington, MA 01887, USA;
| | - Fernando E. Ortega-Ojeda
- Departamento de Ciencias de la Computación, Universidad de Alcalá, Ctra. Madrid-Barcelona Km. 33.6, 28871 Alcalá de Henares, Madrid, Spain;
- Instituto Universitario de Investigación en Ciencias Policiales (IUICP), Universidad de Alcalá, Libreros 27, 28801 Alcalá de Henares, Madrid, Spain
| | - Andrés Proaño
- Programa de Reactivación de Café y Cacao, Ministerio de Agricultura y Ganadería, Av. Eloy Alfaro y Av. Amazonas, Quito 170518, Ecuador;
| | - Armando Echeverría
- Facultad de Ciencias Técnicas, Universidad Internacional del Ecuador, Quito 170411, Ecuador;
| | - Luis Ramos-Guerrero
- Grupo de Investigación Bio-Quimioinformática, Carrera de Ingeniería Agroindustrial, Facultad de Ingeniería y Ciencias Aplicadas, Universidad de Las Américas (UDLA), Quito 170503, Ecuador
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Aziz M, Ejaz SA, Tamam N, Siddique F. A comprehensive computational approach for the identification of structure-based potential pharmacological candidates as selective AKR1B1 and AKR1B10 inhibitors: repurposing of purine alkaloids for the treatment of cancer. J Biomol Struct Dyn 2023; 41:7892-7912. [PMID: 36214620 DOI: 10.1080/07391102.2022.2127906] [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: 06/15/2022] [Accepted: 09/16/2022] [Indexed: 10/17/2022]
Abstract
Significant metabolic pathways have been linked to AKR1B1 and AKR1B10. These enzymes are crucial biological targets in the therapy of colon cancer. In the past several decades, drug repurposing has gained appeal as a time and cost-efficient strategy for providing new indications for existing drugs. The structural properties of the plant-based alkaloidal drugs theobromine and theophylline were examined using density functional theory (DFT) computations, where the B3LYP/SVP method was used to quantify the dipole moment, polarizability, and optimization energy. Optimized structures obtained through DFT studies were docked inside the active pocket of target proteins to evaluate their inhibitory potential. Moreover, molecular dynamic simulation provides significant insight into a dynamic view of molecular interactions. The findings of current revealed theobromine and theophylline as strong AKR1B1 and AKR1B10 inhibitors, respectively. In addition, the anti-cancer potential of theophylline and theobromine was validated by targeting various tumor proteins, i.e. NF-κB, cellular tumor antigen P53 and caspase-3 using a molecular docking approach. Theobromine was found to be strongly interacted with NF-κB and caspase-3, whereas theophylline potentially inhibited cellular tumor antigen P53. In addition, the ADMET characteristics of theobromine and theophylline were identified, confirming their drug-like capabilities. These results should open the way for further experimental validation and structure-based drug design/repurposing of AKR1B1/AKR1B10 inhibitors for the treatment of colon cancer and associated malignancies.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Mubashir Aziz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
| | - Syeda Abida Ejaz
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, The Islamia University of Bahawalpur, Bahawalpur, Pakistan
| | - Nissren Tamam
- Department of Physics, College of Science, Princess Nourah Bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Farhan Siddique
- Laboratory of Organic Electronics, Department of Science and Technology, Linköping University, Norrköping, Sweden
- Department of Pharmacy, Royal Institute of Medical Sciences (RIMS), Multan, Pakistan
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Stefanowska K, Woźniak M, Sip A, Mrówczyńska L, Majka J, Kozak W, Dobrucka R, Ratajczak I. Characteristics of Chitosan Films with the Bioactive Substances-Caffeine and Propolis. J Funct Biomater 2023; 14:358. [PMID: 37504853 PMCID: PMC10381157 DOI: 10.3390/jfb14070358] [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: 05/31/2023] [Revised: 07/02/2023] [Accepted: 07/07/2023] [Indexed: 07/29/2023] Open
Abstract
Chitosan is a natural and biodegradable polymer with promising potential for biomedical applications. This study concerns the production of chitosan-based materials for future use in the medical industry. Bioactive substances-caffeine and ethanolic propolis extract (EEP)-were incorporated into a chitosan matrix to increase the bioactivity of the obtained films and improve their mechanical properties. Acetic and citric acids were used as solvents in the production of the chitosan-based films. The obtained materials were characterized in terms of their antibacterial and antifungal activities, as well as their mechanical properties, including tensile strength and elongation at break. Moreover, the chemical structures and surface morphologies of the films were assessed. The results showed that the solution consisting of chitosan, citric acid, caffeine, and EEP exhibited an excellent antiradical effect. The activity of this solution (99.13%) was comparable to that of the standard antioxidant Trolox (92.82%). In addition, the film obtained from this solution showed good antibacterial activity, mainly against Escherichia coli and Enterococcus faecalis. The results also revealed that the films produced with citric acid exhibited higher activity levels against pathogenic bacteria than the films obtained with acetic acid. The antimicrobial effect of the chitosan-based films could be further enhanced by adding bioactive additives such as caffeine and propolis extract. The mechanical tests showed that the solvents and additives used affected the mechanical properties of the films obtained. The film produced from chitosan and acetic acid was characterized by the highest tensile strength value (46.95 MPa) while the chitosan-based film with citric acid showed the lowest value (2.28 MPa). The addition of caffeine and propolis to the film based on chitosan with acetic acid decreased its tensile strength while in the case of the chitosan-based film with citric acid, an increase in strength was observed. The obtained results suggested that chitosan films with natural bioactive substances can be a promising alternative to the traditional materials used in the medical industry, for example, as including biodegradable wound dressings or probiotic encapsulation materials.
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Affiliation(s)
- Karolina Stefanowska
- Department of Chemistry, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 75, 60625 Poznań, Poland
| | - Magdalena Woźniak
- Department of Chemistry, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 75, 60625 Poznań, Poland
| | - Anna Sip
- Department of Biotechnology and Food Microbiology, Faculty of Food Science and Nutrition, Poznan University of Life Sciences, Wojska Polskiego 48, 60627 Poznań, Poland
| | - Lucyna Mrówczyńska
- Department of Cell Biology, Faculty of Biology, Adam Mickiewicz University, Uniwersytetu Poznańskiego 6, 61614 Poznań, Poland
| | - Jerzy Majka
- Department of Wood Science and Thermal Techniques, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 38/42, 60637 Poznań, Poland
| | - Wojciech Kozak
- Department of Industrial Products and Packaging Quality, Institute of Quality Science, Poznań University of Economics and Business, al. Niepodległości 10, 61875 Poznań, Poland
| | - Renata Dobrucka
- Department of Industrial Products and Packaging Quality, Institute of Quality Science, Poznań University of Economics and Business, al. Niepodległości 10, 61875 Poznań, Poland
| | - Izabela Ratajczak
- Department of Chemistry, Faculty of Forestry and Wood Technology, Poznan University of Life Sciences, Wojska Polskiego 75, 60625 Poznań, Poland
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Can K, Can Z, Üzer A, Apak R. Visual colorimetric sensor for nitroguanidine detection based on hydrogen bonding-induced aggregation of uric acid-functionalized gold nanoparticles. Talanta 2023; 260:124585. [PMID: 37119798 DOI: 10.1016/j.talanta.2023.124585] [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: 02/10/2023] [Revised: 04/19/2023] [Accepted: 04/20/2023] [Indexed: 05/01/2023]
Abstract
A colorimetric assay is proposed for the quantification of nitroguanidine (NQ), based on triggering the aggregation of uric acid-modified gold nanoparticles (AuNPs@UA) by intermolecular hydrogen bonding interaction between uric acid (UA) and NQ. The red-to-purplish blue (lavender) color change of AuNPs@UA with increasing NQ concentrations could be perceived with the naked eye or detected by UV-vis spectrophotometry. The absorbance versus concentration correlation gave a linear calibration curve in the range of 0.6-3.2 mg L-1 NQ, with a correlation coefficient of 0.9995. The detection limit of the developed method was 0.063 mg L-1, lower than those of noble metal aggregation methods in the literature. The synthesized and modified AuNPs were characterized using UV-vis spectrophotometry, scanning transmission electron microscopy (STEM), dynamic light scattering (DLS), and Fourier transform infrared spectroscopy (FTIR). Some critical parameters such as modification conditions of AuNPs, UA concentration, solvent environment, pH, and reaction time were optimized for the proposed method. The non-interference of common explosives (i.e., nitroaromatic, nitramine, nitrate ester, insensitive and inorganic explosives), common soil and groundwater ions (Na+, K+, Ca2+, Mg2+, Cu2+, Fe2+, Fe3+, Cl-, NO3-, SO42-, CO32-, PO43-) and possible interfering compounds (used as camouflage agents for explosives; D-(+)-glucose, sweeteners, acetylsalicylic acid (aspirin), household powder detergents, and paracetamol) on the proposed method was demonstrated, proving that the procedure was fairly selective for NQ, due to special hydrogen bonding interactions between UA-functionalized AuNPs and NQ. Finally, the proposed spectrophotometric method was applied to NQ-contaminated soil, and the obtained results were statistically compared with those of the liquid chromatography-tandem mass spectrometric (LC-MS/MS) method in the literature.
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Affiliation(s)
- Kader Can
- Department of Chemistry, Institute of Graduate Studies, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey; Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey
| | - Ziya Can
- Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey
| | - Ayşem Üzer
- Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey.
| | - Reşat Apak
- Department of Chemistry, Faculty of Engineering, Istanbul University-Cerrahpaşa, Avcilar, 34320, Istanbul, Turkey; Turkish Academy of Sciences (TUBA), Bayraktar Neighborhood, Vedat Dalokay St. No:112, Çankaya, 06670, Ankara, Turkey.
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Zhang X, Wang J, Wang Y, Yao Z, Guo W, Xu H, Jiang Z. Boosting electron transport process over multiple channels induced by S-doped carbon and Fe 7S 8 NPs interface toward high-efficiency antibiotics removal. JOURNAL OF HAZARDOUS MATERIALS 2023; 442:130115. [PMID: 36303349 DOI: 10.1016/j.jhazmat.2022.130115] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2022] [Revised: 09/21/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
The enhancement of electron transport process on multiple channels of C-Fe and C-S-Fe bonds between dual-reaction centres was investigated for stimulating the antibiotics degradation in Fenton-like processes. Herein, multiple channels structure of sulfur-doped carbon coupled Fe7S8 cluster through C-Fe bond and C-S-Fe bond was constructed through density functional theory (DFT), and S-doped carbon framework coated Fe7S8 nanoparticles (Fe7S8/SC) Fenton-like catalyst was prepared through hydrothermal and subsequent sulfuration process. The DFT calculations revealed that electrons are thermodynamically transferred from carbon to iron along both C-Fe and C-S-Fe bonds. The optimized Fe7S8/SC catalyst exhibited desirable catalytic property for Fenton-like degradation for various antibiotics, the removal of amoxicillin, norfloxacin, and tetracycline hydrochloride reach 98.9%, 97.8%, and 99.3% respectively within 40 min under neutral pH, and catalyst also demonstrated excellent cycle stability after five runs. The excellent degradation effect of antibiotics by Fenton-like catalyst was attributed to the intensified electron transport process by multiple electron transfer channels between dual reaction centres, making FeII easier to regenerate. This study spreads a new route for the enhancement of electron transport process in Fenton-like catalysts by constructing multiple channels.
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Affiliation(s)
- Xiao Zhang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Jiankang Wang
- College of Materials Science and Engineering, Yangtze Normal University, Chongqing 408100, China
| | - Yahui Wang
- State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Hefei 230037, China
| | - Zhongping Yao
- School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China.
| | - Wanqian Guo
- School of Environmental Engineering, Harbin Institute of Technology, Harbin 150001, China
| | - Hongbo Xu
- School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China
| | - Zhaohua Jiang
- School of Chemistry and Chemical Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150001, China
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Nashed N, Lam M, Ghafourian T, Pausas L, Jiri M, Majumder M, Nokhodchi A. An Insight into the Impact of Thermal Process on Dissolution Profile and Physical Characteristics of Theophylline Tablets Made through 3D Printing Compared to Conventional Methods. Biomedicines 2022; 10:biomedicines10061335. [PMID: 35740357 PMCID: PMC9219830 DOI: 10.3390/biomedicines10061335] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2022] [Revised: 05/29/2022] [Accepted: 05/31/2022] [Indexed: 11/16/2022] Open
Abstract
The dissolution profile is of great importance in drug delivery and is affected by the manufacturing method. Thus, it is important to study the influence of the thermal process on drug release in emerging technologies such as 3D printing-fused deposition modeling (FDM). For this purpose, the characteristics of 3D printed tablets were compared to those of tablets prepared by other thermal methods such as hot-melt extrusion (HME) and non-thermal methods such as physical mixture (PM). Theophylline was used as a drug model and blends of ethyl cellulose (EC) and hydroxypropyl cellulose (HPC) were used as a matrix former. The solid state of the drug in all formulations was investigated by differential scanning calorimetry, X-ray powder diffraction, and Fourier-transformed infrared spectroscopy. All studied tablets had the same weight and surface area/volume (SA/V). Dissolution data showed that, for some formulations, printed tablets interestingly had a faster release profile despite having the highest hardness values (>550 N) compared to HME and PM tablets. Porosity investigations showed that 100% infill printed tablets had the highest porosity (~20%) compared to HME (<10%) and PM tablets (≤11%). True density records were the lowest in printed tablets (~1.22 g/m3) compared to tablets made from both HME and PM methods (~1.26 g/m3), reflecting the possible increase in polymer specific volume while printing. This increase in the volume of polymer network may accelerate water and drug diffusion from/within the matrix. Thus, it is a misconception that the 3D printing process will always retard drug release based on increased tablet hardness. Hardness, porosity, density, solid-state of the drug, SA/V, weight, and formulation components are all factors contributing to the release profile where the total balance can either slow down or accelerate the release profile.
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Affiliation(s)
- Nour Nashed
- Pharmaceutics Research Laboratory, Arundel Building, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK; (N.N.); (M.L.)
| | - Matthew Lam
- Pharmaceutics Research Laboratory, Arundel Building, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK; (N.N.); (M.L.)
| | - Taravat Ghafourian
- School of Life Sciences, Faculty of Creative Arts, Technologies and Science, University of Bedfordshire, Luton LU1 3JU, UK;
| | - Lluis Pausas
- M2M Pharmaceuticals Ltd., The Gateway Building, 1 Collegiate Square, Thames Valley Science Park, Reading RG2 9LH, UK; (L.P.); (M.J.); (M.M.)
| | - Memory Jiri
- M2M Pharmaceuticals Ltd., The Gateway Building, 1 Collegiate Square, Thames Valley Science Park, Reading RG2 9LH, UK; (L.P.); (M.J.); (M.M.)
| | - Mridul Majumder
- M2M Pharmaceuticals Ltd., The Gateway Building, 1 Collegiate Square, Thames Valley Science Park, Reading RG2 9LH, UK; (L.P.); (M.J.); (M.M.)
| | - Ali Nokhodchi
- Pharmaceutics Research Laboratory, Arundel Building, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, UK; (N.N.); (M.L.)
- Correspondence: ; Tel.: +44-1273872811
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11
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Zhang T, Wu L, Pei J, Li X, Li H, Inscore F. Part-Per-Billion Level Chemical Sensing with a Gold-Based SERS-Active Substrate. SENSORS 2022; 22:s22051778. [PMID: 35270924 PMCID: PMC8915063 DOI: 10.3390/s22051778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 02/15/2022] [Accepted: 02/22/2022] [Indexed: 12/16/2022]
Abstract
We used surface-enhanced Raman spectroscopy (SERS) for the rapid and sensitive detection and quantification of caffeine in solution. Such a technique incorporated into a portable device is finding wide applications in trace chemical analysis in various fields, including law enforcement, medicine, environmental monitoring, and food quality control. To realize such applications, we are currently developing portable and handheld trace chemical analyzers based on SERS, which are integrated with a sensor embedded with activated gold nanoparticles in a porous glass matrix. In this study, we used this gold SERS-active substrate to measure aqueous solutions of the drug caffeine as a test chemical to benchmark sensor performance by defining sensitivity (lowest measured concentration (LMC) and estimated limit of detection (LOD)), determining concentration dependence and quantification capabilities by constructing calibration curves; by evaluating the effects of pH values of 3, 7, and 11; and by examining the reproducibility of the SERS measurements. The results demonstrate that the SERS sensor is sensitive, with caffeine detected at an LMC of 50 parts per billion (ppb) with an LOD of 0.63 ppb. The results further show that the sensor is very stable and can be used to make reproducible measurements, even under extremely acidic to basic pH conditions. Vibrational assignments of all observed SERS peaks are made and reported for the first time for caffeine on a gold substrate.
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Affiliation(s)
- Tingting Zhang
- Micro Optical Instruments, Shenzhen 518118, China; (T.Z.); (L.W.); (H.L.)
| | - Liyun Wu
- Micro Optical Instruments, Shenzhen 518118, China; (T.Z.); (L.W.); (H.L.)
| | - Junchang Pei
- Institute of Criminal Science and Technology, Taizhou Public Security Bureau, Taizhou 225300, China; (J.P.); (X.L.)
| | - Xuefeng Li
- Institute of Criminal Science and Technology, Taizhou Public Security Bureau, Taizhou 225300, China; (J.P.); (X.L.)
| | - Haowen Li
- Micro Optical Instruments, Shenzhen 518118, China; (T.Z.); (L.W.); (H.L.)
| | - Frank Inscore
- Micro Optical Instruments, Shenzhen 518118, China; (T.Z.); (L.W.); (H.L.)
- Correspondence: ; Tel.: +86-755-33082899
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12
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Painuli R, Raghav S, Jha PC, Athar M, Kumar D. Thermodynamics and kinetics to develop an analytical method for sensing of aqueous Hg(II) using caffeic acid decorated AgNPs. INORG NANO-MET CHEM 2022. [DOI: 10.1080/24701556.2022.2034012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Ritu Painuli
- Department of Chemistry, Banasthali Vidyapith, Rajasthan, India
| | - Sapna Raghav
- Department of Chemistry, Banasthali Vidyapith, Rajasthan, India
| | - Prakash C. Jha
- Centre for Applied Chemistry, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Mohd Athar
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar, Gujarat, India
| | - Dinesh Kumar
- School of Chemical Sciences, Central University of Gujarat, Gandhinagar, Gujarat, India
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13
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Physicomechanical characterization and tablet compression of theophylline nanofibrous mats prepared by conventional and ultrasound enhanced electrospinning. Int J Pharm 2022; 616:121558. [PMID: 35143904 DOI: 10.1016/j.ijpharm.2022.121558] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2021] [Revised: 01/25/2022] [Accepted: 02/02/2022] [Indexed: 11/21/2022]
Abstract
Theophylline (TEO) nanofibers with polyethylene oxide (PEO) were prepared by conventional electrospinning (ES) and novel needleless ultrasound-enhanced electrospinning (USES). They were compared for Young's modulus, elongation at rupture and rupture stress, tabletability and drug release. Placebo (PEO) or drug-loaded (PEO/TEO 90:10) nanofibers were examined by scanning electron microscopy (SEM), powder X-ray diffraction (PXRD), differential scanning calorimetry (DSC) and infrared spectroscopy (ATR-FTIR). Nanofibers prepared by USES were thinner than ES nanofibers and drug-loaded nanofibers thinner than placebo. Drug was mostly amorphous and interacted weakly with PEO. Mats generated by USES and also drug-loaded mats demonstrated higher Young's modulus (stiffness) and higher rupture stress. Under compression, USES and drug-loaded nanofibers demonstrated greater compaction work, higher yield pressure (Heckel and K-L models), and produced stronger tablets than ES and placebo respectively. Principal Component Analysis revealed two significant components explaining 91.05% of the variance. The first comprised the compaction work, yield pressure (ductility) and Young's modulus that were positively intercorrelated and elongation at rupture that was correlated negatively. The second comprised the mat rupture stress and tablet breaking load. Drug release from nanofibrous tablets was faster than tablets of physical mixture but there was no difference between the tablets of the two electrospinning methods.
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Silver Nanoparticles for Conductive Inks: From Synthesis and Ink Formulation to Their Use in Printing Technologies. METALS 2022. [DOI: 10.3390/met12020234] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Currently, silver nanoparticles have attracted large interest in the photonics, electrics, analytical, and antimicrobial/biocidal fields due to their excellent optical, electrical, biological, and antibacterial properties. The versatility in generating different sizes, shapes, and surface morphologies results in a wide range of applications of silver nanoparticles in various industrial and health-related areas. In industrial applications, silver nanoparticles are used to produce conductive inks, which allows the construction of electronic devices on low-cost and flexible substrates by using various printing techniques. In order to achieve successful printed patterns, the necessary formulation and synthesis need to be engineered to fulfil the printing technique requirements. Additional sintering processes are typically further required to remove the added polymers, which are used to produce the desired adherence, viscosity, and reliable performance. This contribution presents a review of the synthesis of silver nanoparticles via different methods (chemical, physical and biological methods) and the application of silver nanoparticles under the electrical field. Formulation of silver inks and formation of conductive patterns by using different printing techniques (inkjet printing, screen printing and aerosol jet printing) are presented. Post-printing treatments are also discussed. A summary concerning outlooks and perspectives is presented at the end of this review.
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15
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Miscibility and Solubility of Caffeine and Theophylline in Hydroxypropyl Methylcellulose. Pharmaceutics 2021; 13:pharmaceutics13111836. [PMID: 34834251 PMCID: PMC8624303 DOI: 10.3390/pharmaceutics13111836] [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: 10/08/2021] [Revised: 10/26/2021] [Accepted: 10/29/2021] [Indexed: 12/14/2022] Open
Abstract
As amorphization may improve the solubility and bioavailability of a drug substance, the aim of this work was to assess to what extent the crystallinity of caffeine (CAF) and theophylline (TF) can be reduced by homogenization with a polymeric excipient. To realize this purpose, the physical mixtures of both methylxanthines with hydroxypropyl methylcellulose (HPMC) were examined using differential scanning calorimetry (DSC), hot-stage microscopy (HSM), Fourier-transform infrared (FTIR) and Raman spectroscopy. Moreover, phase diagrams for the physical mixtures were calculated using theoretical data. Results of DSC experiments suggested that both CAF and TF underwent amorphization, which indicated proportional loss of crystallinity for methylxanthines in the mixtures with HPMC. Additionally, HSM revealed that no other crystalline or amorphous phases were created other than those observed for CAF and TF. FTIR and Raman spectra displayed all the bands characteristic for methylxanthines in mixtures with HPMC, thereby excluding changes in their chemical structures. However, changes to the intensity of the bands created by hydrogen bonds imply the formation of hydrogen bonding in the carbonyl group of methylxanthines and the methyl polymer group. This is consistent with data obtained using principal component analysis. The findings of these studies revealed the quantities of methylxanthines which may be dissolved in the polymer at a given temperature and the composition at which methylxanthines and polymer are sufficiently miscible to form a solid solution.
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Gołdyn M, Komasa A, Pawlaczyk M, Lewandowska A, Bartoszak-Adamska E. Salts of purine alkaloids caffeine and theobromine with 2,6-dihydroxybenzoic acid as coformer: structural, theoretical, thermal and spectroscopic studies. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:713-724. [PMID: 34738542 DOI: 10.1107/s2053229621010883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Accepted: 10/19/2021] [Indexed: 11/10/2022]
Abstract
The study of various forms of pharmaceutical substances with specific physicochemical properties suitable for putting them on the market is one of the elements of research in the pharmaceutical industry. A large proportion of active pharmaceutical ingredients (APIs) occur in the salt form. The use of an acidic coformer with a given structure and a suitable pKa value towards purine alkaloids containing a basic imidazole N atom can lead to salt formation. In this work, 2,6-dihydroxybenzoic acid (26DHBA) was used for cocrystallization of theobromine (TBR) and caffeine (CAF). Two novel salts, namely, theobrominium 2,6-dihydroxybenzoate, C7H9N4O2+·C7H5O4- (I), and caffeinium 2,6-dihydroxybenzoate, C8H11N4O2+·C7H5O4- (II), were synthesized. Both salts were obtained independently by slow evaporation from solution, by neat grinding and also by microwave-assisted slurry cocrystallization. Powder X-ray diffraction measurements proved the formation of the new substances. Single-crystal X-ray diffraction studies confirmed proton transfer between the given alkaloid and 26DHBA, and the formation of N-H...O hydrogen bonds in both I and II. Unlike the caffeine cations in II, the theobromine cations in I are paired by noncovalent N-H...O=C interactions and a cyclic array is observed. As expected, the two hydroxy groups in the 26DHBA anion in both salts are involved in two intramolecular O-H...O hydrogen bonds. C-H...O and π-π interactions further stabilize the crystal structures of both compounds. Steady-state UV-Vis spectroscopy showed changes in the water solubility of xanthines after ionizable complex formation. The obtained salts I and II were also characterized by theoretical calculations, Fourier-transform IR spectroscopy (FT-IR), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC) and elemental analysis.
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Affiliation(s)
- Mateusz Gołdyn
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, Poznań 61-614, Poland
| | - Anna Komasa
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, Poznań 61-614, Poland
| | - Mateusz Pawlaczyk
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, Poznań 61-614, Poland
| | - Aneta Lewandowska
- Department of Polymers, Faculty of Chemical Technology, Institute of Chemical Technology and Engineering, Poznan University of Technology, Berdychowo 4, Poznań 60-965, Poland
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Bettini S, Ottolini M, Pagano R, Pal S, Licciulli A, Valli L, Giancane G. Coffee Grounds-Derived CNPs for Efficient Cr(VI) Water Remediation. NANOMATERIALS (BASEL, SWITZERLAND) 2021; 11:1064. [PMID: 33919207 PMCID: PMC8143114 DOI: 10.3390/nano11051064] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/14/2021] [Accepted: 04/17/2021] [Indexed: 11/17/2022]
Abstract
Carbon nanomaterials are a group of materials characterized by sp2/sp3 carbon backbone which, combined with surface atoms and/or chemical groups, ensures peculiar physical chemical features for a wide range of applications. Among these materials, carbon dots and carbon nanoparticles belong to carbon nanomaterials with a few nanometer dimensions. In this work, carbon nanoparticles were produced from spent coffee grounds as sustainable carbon source through a simple, cheap and eco-friendly procedure according to an oxidation process (at controlled temperature) driven by hydrogen peroxide. Atomic Force Microscope (AFM) and fluorescence, UV-Vis absorption, FT-IR and Raman spectroscopy were used to assess the formation of carbon nanomaterials of about 10 nm with the typical emission and absorption properties of carbon dots and peculiar surface features. In fact, the presence of heteroatoms, i.e., phosphorus, and the carbonyl/carboxyl surface groups on carbon nanoparticles, was proposed to confer peculiar properties allowing the fast Mn(VII) reduction to Mn(II) at neutral pH and the Cr(VI) reduction to Cr(III) in weak acid aqueous media.
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Affiliation(s)
- Simona Bettini
- Department of Biological and Environmental Sciences and Technologies, DISTEBA, University of Salento, Via per Arnesano, I-73100 Lecce, Italy; (R.P.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
| | - Michela Ottolini
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, I-73100 Lecce, Italy; (M.O.); (S.P.); (A.L.)
| | - Rosanna Pagano
- Department of Biological and Environmental Sciences and Technologies, DISTEBA, University of Salento, Via per Arnesano, I-73100 Lecce, Italy; (R.P.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
| | - Sudipto Pal
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, I-73100 Lecce, Italy; (M.O.); (S.P.); (A.L.)
| | - Antonio Licciulli
- Department of Engineering for Innovation, University of Salento, Via per Monteroni, I-73100 Lecce, Italy; (M.O.); (S.P.); (A.L.)
| | - Ludovico Valli
- Department of Biological and Environmental Sciences and Technologies, DISTEBA, University of Salento, Via per Arnesano, I-73100 Lecce, Italy; (R.P.); (L.V.)
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
| | - Gabriele Giancane
- Consorzio Interuniversitario Nazionale per la Scienza e Tecnologia dei Materiali, INSTM, Via G. Giusti, 9, I-50121 Firenze, Italy
- Department of Cultural Heritage, University of Salento, Via D. Birago, 48, I-73100 Lecce, Italy
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Rozenberg M, Fausto R, Reva I. Variable temperature FTIR spectra of polycrystalline purine nucleobases and estimating strengths of individual hydrogen bonds. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2021; 251:119323. [PMID: 33508682 DOI: 10.1016/j.saa.2020.119323] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2020] [Revised: 11/19/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
In the first part of this work, we report the FTIR spectra of pure NH and isotopically substituted ND (10-15% D and 80-90% D) polycrystalline hypoxanthine, xanthine, adenine and guanine recorded in the 400-4000 cm-1 range, as a function of temperature (10-300 K). We provide assignments of the stretching and out-of-plane bending amine (NH2) and imine (NH) bands to the distinct H-bonds present in the crystal, based on the temperature sensitivity and isotopic exchange behavior. Empirical correlations between spectral and thermodynamic or structural parameters enabled us to estimate the energies and lengths of H-bonds in the studied nucleobase crystals and to correlate them with literature data. The empirical H-bonding energies are compared with H-bonding and stacking energies computed for hypoxanthine. In the second part, strategies for using the empirical correlations together with information extracted from quantum mechanical data (in particular from the Bader's quantum theory of atoms in molecules, QTAIM) for the evaluation of hydrogen bonding properties are discussed, and their advantages and drawbacks pointed out. The justification for a cooperative use of quantum-mechanical calculations with empirical spectra-energy correlations is discussed.
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Affiliation(s)
- M Rozenberg
- The Hebrew University of Jerusalem, Department of Inorganic and Analytical Chemistry, Jerusalem, Givat Ram 91904, Israel.
| | - R Fausto
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal.
| | - I Reva
- University of Coimbra, CQC, Department of Chemistry, 3004-535 Coimbra, Portugal; University of Coimbra, CIEPQPF, Department of Chemical Engineering, 3030-790 Coimbra, Portugal.
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Lv N, Ma K, Li R, Liang P, Liang P, Gao X. Sublethal and lethal effects of the imidacloprid on the metabolic characteristics based on high-throughput non-targeted metabolomics in Aphis gossypii Glover. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 212:111969. [PMID: 33561773 DOI: 10.1016/j.ecoenv.2021.111969] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2020] [Revised: 01/14/2021] [Accepted: 01/20/2021] [Indexed: 06/12/2023]
Abstract
Sublethal effect considered as an emerging factor to assess the environmental risk of insecticides, which can impact the insects on both physiology and behavior. Lethal exposure can be causing near immediate mortality. Pests are inevitably exposed to sublethal and lethal dose in the agroecosystem following application of pesticides. Insecticides, widely used for the control of insect pests, are irreplaceable in insect pest management. The effects of imidacloprid by the method of high-throughput non-targeted metabolomics was investigated in Aphis gossypii Glover exposed to LC10 and LC90 doses of the imidacloprid, and the control group was treated with the same condition without imidacloprid. Pairwise comparisons showed that 111 metabolites changed significantly, 60 in the LC10 group, and 66 in the LC90 group compared to the control group, while only 16 changes in the LC10 were same with that in LC90 group. Among the changed metabolites, a total of 16 metabolites were identified as potential biomarkers, which represented the most influential pathways including glycolysis and gluconeogenesis, alanine, aspartate, and glutamate metabolism, ascorbate and aldarate metabolism, glutathione metabolism, phenylalanine metabolism, tyrosine metabolism, caffeine metabolism and parkinson's disease (PD), which could account for the sublethal and lethal effects on A. gossypii. These modified metabolic pathways demonstrated that high energy consumption, excitotoxicity and oxidative stress (OS) were appeared in both LC10 and LC90 groups, while PD was detected only in the LC90 group. The results of non-targeted metabolomics revealed the effects of neonicotinoid pesticide exposure on A. gossypii successfully, and provided a deep insight into the influenced physiology by the stress of neonicotinoid pesticide in the insect.
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Affiliation(s)
- Nannan Lv
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Kangsheng Ma
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Ren Li
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Pingzhuo Liang
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Pei Liang
- Department of Entomology, China Agricultural University, Beijing 100193, China
| | - Xiwu Gao
- Department of Entomology, China Agricultural University, Beijing 100193, China.
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On the Use of Phenolic Compounds Present in Citrus Fruits and Grapes as Natural Antioxidants for Thermo-Compressed Bio-Based High-Density Polyethylene Films. Antioxidants (Basel) 2020; 10:antiox10010014. [PMID: 33375591 PMCID: PMC7823819 DOI: 10.3390/antiox10010014] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Revised: 12/09/2020] [Accepted: 12/21/2020] [Indexed: 01/04/2023] Open
Abstract
This study originally explores the use of naringin (NAR), gallic acid (GA), caffeic acid (CA), and quercetin (QUER) as natural antioxidants for bio-based high-density polyethylene (bio-HDPE). These phenolic compounds are present in various citrus fruits and grapes and can remain in their leaves, peels, pulp, and seeds as by-products or wastes after juice processing. Each natural additive was first melt-mixed at 0.8 parts per hundred resin (phr) of bio-HDPE by extrusion and the resultant pellets were shaped into films by thermo-compression. Although all the phenolic compounds colored the bio-HDPE films, their contact transparency was still preserved. The chemical analyses confirmed the successful inclusion of the phenolic compounds in bio-HDPE, though their interaction with the green polyolefin matrix was low. The mechanical performance of the bio-HDPE films was nearly unaffected by the natural compounds, presenting in all cases a ductile behavior. Interestingly, the phenolic compounds successfully increased the thermo-oxidative stability of bio-HDPE, yielding GA and QUER the highest performance. In particular, using these phenolic compounds, the onset oxidation temperature (OOT) value was improved by 43 and 41.5 °C, respectively. Similarly, the oxidation induction time (OIT) value, determined in isothermal conditions at 210 °C, increased from 4.5 min to approximately 109 and 138 min. Furthermore, the onset degradation temperature in air of bio-HDPE, measured for the 5% of mass loss (T5%), was improved by up to 21 °C after the addition of NAR. Moreover, the GA- and CA-containing bio-HDPE films showed a high antioxidant activity in alcoholic solution due to their favored release capacity, which opens up novel opportunities in active food packaging. The improved antioxidant performance of these phenolic compounds was ascribed to the multiple presence of hydroxyl groups and aromatic heterocyclic rings that provide these molecules with the features to permit the delocalization and the scavenging of free radicals. Therefore, the here-tested phenolic compounds, in particular QUER, can represent a sustainable and cost-effective alternative of synthetic antioxidants in polymer and biopolymer formulations, for which safety and environmental issues have been raised over time.
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Hsu HC, Liao PW, Lee HT, Liu WC, Ho ML. Silver Nanoplates for Colorimetric Determination of Xanthine in Human Plasma and in Fish Meat via Etching/Aggregation/Fusion Steps. SENSORS (BASEL, SWITZERLAND) 2020; 20:E5739. [PMID: 33050252 PMCID: PMC7599804 DOI: 10.3390/s20205739] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 09/25/2020] [Accepted: 10/07/2020] [Indexed: 06/11/2023]
Abstract
Silver nanoplates (AgP) were prepared and used in a colorimetric method for the evaluation of Xanthine (Xan) in blood plasma and fish meat. The detection mechanism for Xan was observed to occur via etching of AgP particles/aggregation/fusion steps, resulting in a color change from blue to grey. First, the basic Xan solution is adsorbed through partial substitution of capping molecules around the AgP with Xan, and then intermolecular hydrogen bonds form between AgP and AgP. Subsequently, the titrant Xan solution further etches the AgP and finally fuses particles together. Owing to the step by step mechanism, the response range towards Xan has two linear regression ranges: 0.15-0.60 μM and 0.61-3.00 μM, respectively. The detection limit in the range of 0.15-0.60 μM is 0.011 μM (S/N = 3). AgP exhibits good selectivity for Xan over other potential interferents such as amino acids and blood proteins. AgP achieves rapid detection of Xan and can be applied to the satisfactory determination of Xan in blood plasma and fish meat. This colorimetric sensor is easy to use, cost effective, fast, selective and user friendly.
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Affiliation(s)
| | | | | | | | - Mei-Lin Ho
- Department of Chemistry, Soochow University, No. 70, LinShih Rd., Shih-Lin, Taipei 11102, Taiwan; (H.-C.H.); (P.-W.L.); (H.-T.L.); (W.-C.L.)
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22
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Allan MC, Owens B, Mauer LJ. Relative humidity-temperature transition boundaries for anhydrous β-caffeine and caffeine hydrate crystalline forms. J Food Sci 2020; 85:1815-1826. [PMID: 32449950 DOI: 10.1111/1750-3841.15114] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Revised: 01/31/2020] [Accepted: 02/12/2020] [Indexed: 11/29/2022]
Abstract
Caffeine is a hydrate-forming polymorphic crystalline compound that can exist in α, β, and hydrate forms. Phase transitions between hydrate and anhydrous forms of a crystalline ingredient, and related water migration, can create product quality challenges. The objective of this study was to determine the relative humidity (RH)-temperature phase boundary between anhydrous β-caffeine and caffeine hydrate. The β-caffeine→caffeine hydrate and caffeine hydrate→β-caffeine RH-temperature transition boundaries were determined from 20 to 45 °C using a combination of water activity (aw ) controlled solution and vapor-mediated equilibration, moisture sorption, powder X-ray diffraction, and Fourier-transform infrared spectroscopy techniques. Two transition boundaries were measured: the β-caffeine→caffeine hydrate transition boundary (0.835 ± 0.027 aw at 25 °C) was higher than the caffeine hydrate→β-caffeine transition boundary (0.625 ± 0.003 aw at 25 °C). Moisture sorption rates for β-caffeine, even at high RHs (>84% RH), were slow. However, caffeine hydrate rapidly dehydrated at low RHs (<30% RH) into a metastable transitional anhydrous state with a similar X-ray diffraction pattern to metastable α-caffeine. Exposing this dehydrated hydrate to higher RHs (>65% RH) at lower temperatures (20 to 30 °C) resulted in full restoration to a 4/5 caffeine hydrate. This transitional anhydrous state was unstable and converted to a less hygroscopic state after annealing at 50 °C and 0% RH for 1 day. It was postulated that the caffeine hydrate→β-caffeine was the true β-caffeine↔caffeine hydrate phase boundary and that β-caffeine could be metastable above the caffeine hydrate→β-caffeine transition boundary. These caffeine RH-temperature transition boundaries could be used for selecting formulation and storage conditions to maintain the desired caffeine crystalline form. PRACTICAL APPLICATION: Caffeine can exist as either an anhydrous (without water) or hydrate (internalized water) crystalline state. The stability of each caffeine crystalline form is dictated by humidity (or water activity) and temperature, and these environmental stability boundaries for the caffeine crystalline forms are reported in this manuscript. Conversions between the two crystalline states can lead to deleterious effects; for example, the presence of caffeine hydrate crystals in a low water activity food (e.g., powder) could lead to the relocation of the water in caffeine to other ingredients in the food system, leading to unwanted water-solid interactions that could cause clumping and/or degradation.
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Affiliation(s)
- Matthew C Allan
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN, 47907, U.S.A
| | - Bridget Owens
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN, 47907, U.S.A
| | - Lisa J Mauer
- Department of Food Science, Purdue University, 745 Agriculture Mall Drive, West Lafayette, IN, 47907, U.S.A
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Ragavan I, Vidya C, Shanavas S, Acevedo R, Anbarasan PM, Manjri A, Prakasam A, Sudhakar C, Selvankumar T. Synthesis, spectroscopic characterization and molecular docking study of ethyl 2-(4-(5, 9-dihydro-6-hydroxy-2-mercapto-4H-purin-8-ylthio) thiophen-2-yl)-2-oxoacetate molecule for the chemotherapeutic treatment of breast cancer cells. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110596] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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24
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Zhang Y, Fu Y, Jiang S, Qiao H, Xiong Y, Fu H, Zhang W, Gong Y, Jin S, Wu Y. Comparative metabolomics analysis of ovarian developmental stages in Macrobrachium nipponense. COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY D-GENOMICS & PROTEOMICS 2020; 34:100648. [PMID: 32078987 DOI: 10.1016/j.cbd.2019.100648] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 11/21/2019] [Accepted: 11/21/2019] [Indexed: 01/12/2023]
Abstract
Rapid sexual maturity of female Macrobrachium nipponense is a severe problem for the aquaculture industry. To date, there have been only transcriptome studies investigating ovarian development, and studies using other tools, such as metabolomics are lacking. Metabolomics reveals changes in the level of metabolites in tissues in relation to current physiological characteristics, and can yield valuable insight into the growth and development of organisms. In this study, we systematically analyzed 15 samples from five different ovarian developmental stages in M. nipponense to learn more about how metabolites change over reproduction. Gas chromatography/time-of-flight mass spectroscopy revealed an array of different compounds and 83-162 pathways depending on the stage. Furthermore, 89 metabolites and 14 pathways were significantly different across stages. It is hypothesized that N-acetyl-N-formyl-5-methoxykynurenamine, ascorbate, fructose-2,6-bisphosphate, cortexolone and other metabolites that significantly differed by stage are regulated by hormones and are closely related to ovarian development. However, for other metabolites that changed with development, such as cytidine and xanthine, an association with ovarian development has yet to be revealed. Quantitative polymerase chain reaction was used to correlate gene changes to metabolites in the pathway for biosynthesis of plant secondary metabolites. We found that the TCA cycle rate may be the cause of female miniaturization during the reproductive period, and that the control of fatty acid content via aquaculture nutrition may be an exogenous tool for regulatory control of maturation. This study provides a systematic and comprehensive metabolomics analysis of ovarian development in M. nipponense and lays a foundation for addressing the problem of rapid sexual maturity.
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Affiliation(s)
- Yuning Zhang
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, PR China
| | - Yin Fu
- Shanghai Institute of Nutrition and Health, CAS, Shanghai 200031, PR China
| | - Sufei Jiang
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Hui Qiao
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Yiwei Xiong
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Hongtuo Fu
- Wuxi Fisheries College, Nanjing Agricultural University, Wuxi 214081, PR China; Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China.
| | - Wenyi Zhang
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Yongsheng Gong
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Shubo Jin
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
| | - Yan Wu
- Key Laboratory of Freshwater Fisheries and Germplasm Resources Utilization, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, PR China
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25
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Jin L, Liu C, Yang FZ, Wu DY, Tian ZQ. Coordination behavior of theophylline with Au(III) and electrochemical reduction of the complex. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.02.118] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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26
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Prediction of differential scanning calorimetry curve of theophylline direct compression model tablet using Raman spectra. J Drug Deliv Sci Technol 2019. [DOI: 10.1016/j.jddst.2018.11.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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27
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Kallakunta VR, Patil H, Tiwari R, Ye X, Upadhye S, Vladyka RS, Sarabu S, Kim DW, Bandari S, Repka MA. Exploratory studies in heat-assisted continuous twin-screw dry granulation: A novel alternative technique to conventional dry granulation. Int J Pharm 2018; 555:380-393. [PMID: 30458256 DOI: 10.1016/j.ijpharm.2018.11.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2018] [Revised: 11/13/2018] [Accepted: 11/16/2018] [Indexed: 11/16/2022]
Abstract
Dry granulation is the preferred technique for solvent-sensitive products, especially drugs with stability problems such as hydrolysis. Twin-screw granulation is a continuous granulation technique, offering a potential alternative to conventional dry granulation techniques such as roller compaction. The major advantage of twin-screw granulation is the ability to adjust process parameters of dry granulation without compromising the compression properties. This study was aimed to perform exploratory studies of heat-assisted continuous twin-screw dry granulation process to formulate sustained release tablets for APIs with different melting points: theophylline, acetaminophen and lidocaine hydrochloride hydrate. Granulation feasibility was studied with different binders (e.g. Klucel™ EF, Kollidon® VA64), sustained release agents (e.g. Klucel™ MF, Eudragit® RSPO) and diluents at various drug loads. The processing conditions were below the melting point or glass transition temperature of the formulation ingredients. After successful granulation, DSC and XRD studies revealed the crystalline nature of the granules and FTIR studies showed no interaction of the API with the excipients. The granules were compressed into sustained release tablets without any compressibility issues. The tablets were stable after testing for 6 months at 25 °C/60% RH. This novel continuous dry granulation technique may offer an excellent alternative to conventional dry granulation techniques.
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Affiliation(s)
- Venkata Raman Kallakunta
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Hemlata Patil
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Roshan Tiwari
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Xingyou Ye
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Sampada Upadhye
- Catalent Pharma Solutions, 14 School House Road, Somerset, NJ 08873, USA
| | - Ronald S Vladyka
- Catalent Pharma Solutions, 14 School House Road, Somerset, NJ 08873, USA
| | - Sandeep Sarabu
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Dong Wuk Kim
- College of Pharmacy, Kyungpook National University, Daegu 41566, South Korea
| | - Suresh Bandari
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States
| | - Michael A Repka
- Department of Pharmaceutics and Drug Delivery, School of Pharmacy, The University of Mississippi, MS 38677, United States; Pii Center for Pharmaceutical Technology, University of Mississippi, MS 38677, USA.
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28
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Muniz-Miranda F, Pedone A, Muniz-Miranda M. Raman and Computational Study on the Adsorption of Xanthine on Silver Nanocolloids. ACS OMEGA 2018; 3:13530-13537. [PMID: 31458060 PMCID: PMC6644810 DOI: 10.1021/acsomega.8b02174] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2018] [Accepted: 10/08/2018] [Indexed: 06/09/2023]
Abstract
Xanthine is a nucleobase, deriving from adenine and guanine by deamination and oxidation processes, which may deposit in the human body causing diseases, similar to uric acid. Here, we have investigated the adsorption of xanthine on silver colloidal nanoparticles by means of surface-enhanced Raman scattering (SERS) with an exciting radiation in the near-infrared spectral region, where interference due to fluorescence does not occur, along with density functional theory calculations of molecule/metal model systems. By adopting a combined experimental and computational approach, we have identified the "marker" SERS bands of xanthine and the tautomer that preferentially binds the silver particles, as well as the molecular group involved in the interaction with metal. This investigation allows using the FT-SERS spectroscopy for biosensory and diagnostic purposes in body fluids, detecting abnormal levels of xanthine, and preventing metabolic diseases.
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Affiliation(s)
- Francesco Muniz-Miranda
- Department
of Chemical and Geological Sciences (DSCG), University of Modena and Reggio Emilia (UniMORE), Via Campi 103, 41125 Modena, Italy
| | - Alfonso Pedone
- Department
of Chemical and Geological Sciences (DSCG), University of Modena and Reggio Emilia (UniMORE), Via Campi 103, 41125 Modena, Italy
| | - Maurizio Muniz-Miranda
- Department
of Chemistry “Ugo Schiff”, University of Florence (UniFI), Via della Lastruccia 3, 50019 Sesto Fiorentino, Italy
- Institute
of Complex Systems (CNR), Via Madonna del Piano 10, 50019 Sesto Fiorentino, Italy
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29
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Kallakunta VR, Tiwari R, Sarabu S, Bandari S, Repka MA. Effect of formulation and process variables on lipid based sustained release tablets via continuous twin screw granulation: A comparative study. Eur J Pharm Sci 2018; 121:126-138. [PMID: 29772273 PMCID: PMC6235737 DOI: 10.1016/j.ejps.2018.05.007] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2018] [Revised: 05/03/2018] [Accepted: 05/12/2018] [Indexed: 11/30/2022]
Abstract
The current study's aim is to prepare lipid based sustained release tablets via a twin-screw granulation technique and compare those dosage forms with conventional techniques, namely wet granulation and direct compression. The granules were successfully manufactured in a single-step, continuous twin-screw granulation process with a low proportion of binder (Klucel™ EF, HPC SSL) using Compritol® 888 ATO, Precirol® ATO 5 and Geleol™ as sustained release agents. The granules prepared showed good flow characteristics and compaction properties. DSC and XRD studies were conducted to characterize the granules prepared via a twin-screw granulation method and the results demonstrated the crystalline nature of lipids within the granules. FTIR data indicated that there were no interactions with the formulation components investigated. The formulations developed by all three methods were compressed into tablets with a mechanical strength of 14-16 KP. The tablets formulated were characterized for physicochemical properties, in vitro drug release studies, water uptake and erosion studies. These results showed that the drug was not completely released after 24 h for tablets developed by the wet granulation process using all three lipids. The tablets prepared by the direct compression method demonstrated a burst release within 8 to 10 h from Precirol ATO 5® and Geleol™ formulations compared to Compritol® 888 ATO. However, tablets prepared using twin-screw granulation exhibited sustained release of the drug over 24 h and the water uptake and erosion results were in accordance with dissolution data. Stability data for 45 days at accelerated conditions (40 °C/75% RH) showed similar release profiles with ƒ2 values above 50 for all of the twin screw granulation formulations, indicating the suitability of the process for formulating sustained release tablets. These findings of a single-step, continuous twin-screw granulation process are novel and demonstrate new opportunities for development of sustained release tablets.
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Affiliation(s)
- Venkata Raman Kallakunta
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, USA
| | - Roshan Tiwari
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, USA
| | - Sandeep Sarabu
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, USA
| | - Suresh Bandari
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, USA
| | - Michael A Repka
- Department of Pharmaceutics and Drug Delivery, University of Mississippi, University, MS 38677, USA; Pii Center for Pharmaceutical Technology, University of Mississippi, University, MS 38677, USA.
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30
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He Y, Langenhoff AAM, Comans RNJ, Sutton NB, Rijnaarts HHM. Effects of dissolved organic matter and nitrification on biodegradation of pharmaceuticals in aerobic enrichment cultures. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 630:1335-1342. [PMID: 29554753 DOI: 10.1016/j.scitotenv.2018.02.180] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/31/2017] [Revised: 02/13/2018] [Accepted: 02/14/2018] [Indexed: 06/08/2023]
Abstract
Natural dissolved organic matter (DOM) and nitrification can play an important role in biodegradation of pharmaceutically active compounds (PhACs) in aerobic zones of constructed wetlands (CWs). This study used an enrichment culture originating from CW sediment to study the effect of DOM and nitrification on aerobic biodegradation of seven PhACs. The enriched culture degraded caffeine (CAF), metoprolol (MET), naproxen (NAP), and ibuprofen (IBP) with a consistent biodegradability order of CAF>MET>NAP>IBP. Biodegradation of propranolol, carbamazepine, and diclofenac was insignificant (<15%). CAF biodegradation was inhibited by the easily biodegradable DOM. Conversely, DOM enhanced biodegradation of MET, NAP, and IBP, potentially by contributing more biomass capable of degrading PhACs. Nitrification enhanced biodegradation of NAP and IBP and mineralization of the PhAC mixture as well as less biodegradable DOM, which may result from co-metabolism of ammonia oxidizing bacteria or enhanced heterotrophic microbial activity under nitrification. MET biodegradation was inhibited in the presence of nitrification. DOM and nitrification effects on PhAC biodegradation in CWs gained from this study can be used in strategies to improve CW operation, namely: designing hydraulic retention times based on the biodegradability order of specific PhACs; applying DOM amendment; and introducing consistent ammonium streams to increase removal of PhACs of interest.
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Affiliation(s)
- Yujie He
- Department of Environmental Technology, Wageningen University and Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands; State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, 210023 Nanjing, China
| | - Alette A M Langenhoff
- Department of Environmental Technology, Wageningen University and Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands.
| | - Rob N J Comans
- Department of Soil Quality, Wageningen University and Research, P.O. Box 47, 6700 AA Wageningen, The Netherlands
| | - Nora B Sutton
- Department of Environmental Technology, Wageningen University and Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
| | - Huub H M Rijnaarts
- Department of Environmental Technology, Wageningen University and Research, P.O. Box 17, 6700 AA Wageningen, The Netherlands
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31
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Kulla H, Haferkamp S, Akhmetova I, Röllig M, Maierhofer C, Rademann K, Emmerling F. In-situ-Untersuchungen mechanochemischer Eintopfreaktionen. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800147] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Hannes Kulla
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Sebastian Haferkamp
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Irina Akhmetova
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Mathias Röllig
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
| | - Christiane Maierhofer
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
| | - Klaus Rademann
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
- Institut für Chemie; Humboldt-Universität zu Berlin; Brook-Taylor-Straße 2 12489 Berlin Deutschland
| | - Franziska Emmerling
- BAM Bundesanstalt für Materialforschung und -prüfung; Richard-Willstätter-Straße 11 12489 Berlin Deutschland
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32
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Kulla H, Haferkamp S, Akhmetova I, Röllig M, Maierhofer C, Rademann K, Emmerling F. In Situ Investigations of Mechanochemical One-Pot Syntheses. Angew Chem Int Ed Engl 2018; 57:5930-5933. [PMID: 29605971 DOI: 10.1002/anie.201800147] [Citation(s) in RCA: 84] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Indexed: 11/07/2022]
Abstract
We present an in situ triple coupling of synchrotron X-ray diffraction with Raman spectroscopy, and thermography to study milling reactions in real time. This combination of methods allows a correlation of the structural evolution with temperature information. The temperature information is crucial for understanding both the thermodynamics and reaction kinetics. The reaction mechanisms of three prototypical mechanochemical syntheses, a cocrystal formation, a C-C bond formation (Knoevenagel condensation), and the formation of a manganese-phosphonate, were elucidated. Trends in the temperature development during milling are identified. The heat of reaction and latent heat of crystallization of the product contribute to the overall temperature increase. A decrease in temperature occurs via release of, for example, water as a by-product. Solid and liquid intermediates are detected. The influence of the mechanical impact could be separated from temperature effects caused by the reaction.
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Affiliation(s)
- Hannes Kulla
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Sebastian Haferkamp
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Irina Akhmetova
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Mathias Röllig
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
| | - Christiane Maierhofer
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
| | - Klaus Rademann
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
- Department of Chemistry, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489, Berlin, Germany
| | - Franziska Emmerling
- BAM Federal Institute for Materials Research and Testing, Richard-Willstätter-Strasse 11, 12489, Berlin, Germany
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33
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Souza MS, Diniz LF, Vogt L, Carvalho PS, D’vries RF, Ellena J. Avoiding irreversible 5-fluorocytosine hydration via supramolecular synthesis of pharmaceutical cocrystals. NEW J CHEM 2018. [DOI: 10.1039/c8nj02647e] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Supramolecular reaction of 5-FC with caffeine, p-aminobenzoic and caprylic acid gave rise to solid forms physically stable in humid environments.
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Affiliation(s)
- Matheus S. Souza
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
| | - Luan F. Diniz
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
| | - Lautaro Vogt
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
| | - Paulo S. Carvalho
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
| | - Richard F. D’vries
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
- Facultad de Ciencias Básicas
| | - Javier Ellena
- Instituto de Física de São Carlos
- Universidade de São Paulo
- 13.560-970 – São Carlos
- Brazil
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34
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Mercado DF, Caregnato P, Villata LS, Gonzalez MC. Ilex paraguariensis Extract-Coated Magnetite Nanoparticles: A Sustainable Nano-adsorbent and Antioxidant. J Inorg Organomet Polym Mater 2017. [DOI: 10.1007/s10904-017-0757-8] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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iTRAQ-based proteomics monitors the withering dynamics in postharvest leaves of tea plant (Camellia sinensis). Mol Genet Genomics 2017; 293:45-59. [DOI: 10.1007/s00438-017-1362-9] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2017] [Accepted: 08/20/2017] [Indexed: 12/12/2022]
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36
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Ashengroph M. A novel strain of Aureobasidium sp. TeO12 for theophylline production from caffeine. 3 Biotech 2017; 7:176. [PMID: 28664363 DOI: 10.1007/s13205-017-0793-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Accepted: 04/06/2017] [Indexed: 11/26/2022] Open
Abstract
A total of 40 fungal cultures were isolated for their ability to grow on caffeine as a sole source carbon and nitrogen, and further screened for theophylline-producing activities under the growing cell system. Based on thin-layer chromatography and high-performance liquid chromatography analyses, the potent strain Aureobasidium sp. TeO12 was chosen for its capability to generate theophylline via biotransformation of caffeine. It was identified based on phenotypic characteristics and its ITS1-5.8S-ITS2 rDNA sequencing data (GenBank accession number no. KT439072). To improve theophylline yield, the effects of various factors, such as resting cell density, Fe(II) concentration, and course of the transformation of caffeine, were studied in a biotransformation reaction containing 0.1 M sodium phosphate buffer (pH 7), Aureobasidium sp. TeO12 resting cells as the whole-cell catalyst and caffeine (2.5 g/L) as the substrate, and the reaction was incubated at 30 °C on an orbital shaker (200 rpm). The results indicated that optimal combination included resting cell density 6 g/L, Fe(II) concentration 75 mg/L, and the biotransformation time 72 h. Under these optimal reaction conditions, the highest theophylline concentration of 1.55 g/L (molar yield of 67%) with an average degradation yield of the substrate of about 83% was obtained in the biotransformation process. This is the first report on the biotransformation of caffeine into theophylline by a novel strain of the genus Aureobasidium.
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Affiliation(s)
- Morahem Ashengroph
- Department of Biological Sciences and Biotechnology, Faculty of Sciences, University of Kurdistan, P.O. Box 416, Sanandaj, Iran.
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37
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Amperometric biosensors based on carboxylated multiwalled carbon nanotubes-metal oxide nanoparticles-7,7,8,8-tetracyanoquinodimethane composite for the determination of xanthine. Talanta 2017; 167:286-295. [DOI: 10.1016/j.talanta.2017.02.021] [Citation(s) in RCA: 36] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2016] [Revised: 02/03/2017] [Accepted: 02/07/2017] [Indexed: 12/22/2022]
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38
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Thirunarayanan S, Arjunan V, Marchewka M, Mohan S. Structure, vibrations and quantum chemical investigations of hydrogen bonded complex of bis(1–hydroxy–2–methylpropan–2–aminium)selenate. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2016.12.065] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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39
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Kulla H, Wilke M, Fischer F, Röllig M, Maierhofer C, Emmerling F. Warming up for mechanosynthesis – temperature development in ball mills during synthesis. Chem Commun (Camb) 2017; 53:1664-1667. [DOI: 10.1039/c6cc08950j] [Citation(s) in RCA: 90] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We present a first direct measurement of the temperature during milling combined with in situ Raman spectroscopy monitoring.
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Affiliation(s)
- Hannes Kulla
- BAM Federal Institute for Materials Research and Testing
- Berlin
- Germany
- Department of Chemistry
- Humboldt-Universität zu Berlin
| | - Manuel Wilke
- BAM Federal Institute for Materials Research and Testing
- Berlin
- Germany
- Department of Chemistry
- Humboldt-Universität zu Berlin
| | - Franziska Fischer
- BAM Federal Institute for Materials Research and Testing
- Berlin
- Germany
- Department of Chemistry
- Humboldt-Universität zu Berlin
| | - Mathias Röllig
- BAM Federal Institute for Materials Research and Testing
- Berlin
- Germany
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40
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Brandel C, Cartigny Y, Coquerel G, Ter Horst JH, Petit S. Prenucleation Self-Assembly and Chiral Discrimination Mechanisms during Solution Crystallisation of Racemic Diprophylline. Chemistry 2016; 22:16103-16112. [PMID: 27667660 DOI: 10.1002/chem.201602707] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Indexed: 11/08/2022]
Abstract
The crystallisation behaviour of (RS)-diprophylline (DPL) in two different solvents is investigated to assess the incidence of solvated pre-associations on nucleation, crystal growth and chiral discrimination. In the solvated state, Raman spectroscopy shows that dimeric associations similar to those depicted in the crystalline solid solution (ssRII) predominate in isopropanol (IPA), which may account for the systematic spontaneous nucleation of this crystal form from this solvent. By contrast, spontaneous nucleation in DMF yields the stable racemic compound RI, consistently with the distinct features of the Raman spectrum collected in this solvent. A crystal growth study of ssRII in IPA reveals that the crystal habitus is impacted by the solution enantiomeric excess; this is explained by increased competition between homo- and heterochiral pre-associations. This is supported by a molecular modelling study on the enantiomeric selectivity of the DPL crystal lattices. The combination of assessment methods on solution chemistry, nucleation and chiral discrimination provides methodological tools from which the occurrence of solid solutions can be rationalised.
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Affiliation(s)
- Clément Brandel
- Normandi Université, Laboratoire SMS-EA3233, Université de Rouen, 76821, Mont Saint Aignan Cedex, France.
| | - Yohann Cartigny
- Normandi Université, Laboratoire SMS-EA3233, Université de Rouen, 76821, Mont Saint Aignan Cedex, France
| | - Gérard Coquerel
- Normandi Université, Laboratoire SMS-EA3233, Université de Rouen, 76821, Mont Saint Aignan Cedex, France
| | - Joop H Ter Horst
- University of Strathclyde, EPSRC Centre for Innovative, Manufacturing in Continuous Manufacturing and, Crystallisation (CMAC), Strathclyde Institute of Pharmacy, and Biomedical Sciences (SIPBS), Technology and Innovation Centre, 99 George Street, Glasgow, G1 1RD, UK
| | - Samuel Petit
- Normandi Université, Laboratoire SMS-EA3233, Université de Rouen, 76821, Mont Saint Aignan Cedex, France
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41
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Salinivibrio costicola GL6, a Novel Isolated Strain for Biotransformation of Caffeine to Theobromine Under Hypersaline Conditions. Curr Microbiol 2016; 74:34-41. [DOI: 10.1007/s00284-016-1148-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2016] [Accepted: 10/13/2016] [Indexed: 10/20/2022]
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42
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"RaMassays": Synergistic Enhancement of Plasmon-Free Raman Scattering and Mass Spectrometry for Multimodal Analysis of Small Molecules. Sci Rep 2016; 6:34521. [PMID: 27698368 PMCID: PMC5048303 DOI: 10.1038/srep34521] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2016] [Accepted: 09/15/2016] [Indexed: 11/08/2022] Open
Abstract
SiO2/TiO2 core/shell (T-rex) beads were exploited as "all-in-one" building-block materials to create analytical assays that combine plasmon-free surface enhanced Raman scattering (SERS) and surface assisted laser desorption/ionization (SALDI) mass spectrometry (RaMassays). Such a multi-modal approach relies on the unique optical properties of T-rex beads, which are able to harvest and manage light in both UV and Vis range, making ionization and Raman scattering more efficient. RaMassays were successfully applied to the detection of small (molecular weight, M.W. <400 Da) molecules with a key relevance in biochemistry and pharmaceutical analysis. Caffeine and cocaine were utilized as molecular probes to test the combined SERS/SALDI response of RaMassays, showing excellent sensitivity and reproducibility. The differentiation between amphetamine/ephedrine and theophylline/theobromine couples demonstrated the synergistic reciprocal reinforcement of SERS and SALDI. Finally, the conversion of L-tyrosine in L-DOPA was utilized to probe RaMassays as analytical tools for characterizing reaction intermediates without introducing any spurious effects. RaMassays exhibit important advantages over plasmonic nanoparticles in terms of reproducibility, absence of interference and potential integration in multiplexed devices.
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43
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Fischer F, Joester M, Rademann K, Emmerling F. Survival of the Fittest: Competitive Co-crystal Reactions in the Ball Mill. Chemistry 2015; 21:14969-74. [PMID: 26332316 DOI: 10.1002/chem.201500925] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2015] [Revised: 07/01/2015] [Indexed: 11/09/2022]
Abstract
The driving forces triggering the formation of co-crystals under milling conditions were investigated by using a set of multicomponent competitive milling reactions. In these reactions, different active pharmaceutical ingredients were ground together with a further compound acting as coformer. The study was based on new co-crystals including the coformer anthranilic acid. The results of the competitive milling reactions indicate that the formation of co-crystals driven by intermolecular recognition are influenced and inhibited by kinetic aspects including the formation of intermediates and the stability of the reactants.
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Affiliation(s)
- Franziska Fischer
- BAM Federal Institute for Materials Research and Testing, R.-Willstätter-Strasse 11, 12489 Berlin (Germany).,Department of Chemistry, Humboldt-Universität zu Berlin, B.-Taylor-Strasse 2, 12489 Berlin (Germany)
| | - Maike Joester
- BAM Federal Institute for Materials Research and Testing, R.-Willstätter-Strasse 11, 12489 Berlin (Germany).,Department of Chemistry, Humboldt-Universität zu Berlin, B.-Taylor-Strasse 2, 12489 Berlin (Germany)
| | - Klaus Rademann
- Department of Chemistry, Humboldt-Universität zu Berlin, B.-Taylor-Strasse 2, 12489 Berlin (Germany)
| | - Franziska Emmerling
- BAM Federal Institute for Materials Research and Testing, R.-Willstätter-Strasse 11, 12489 Berlin (Germany).
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44
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Belay A, Kim HK, Hwang YH. Probing the interaction of caffeic acid with ZnO nanoparticles. LUMINESCENCE 2015; 31:654-9. [DOI: 10.1002/bio.3007] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2015] [Revised: 06/25/2015] [Accepted: 07/17/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Abebe Belay
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
- Department of Applied Physics, School of Applied Natural Sciences; Adama Science and Technology University; P.O.Box 1888 Adama Ethiopia
| | - Hyung Kook Kim
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
| | - Yoon-Hwae Hwang
- Department of Nanomaterial Engineering & BK 21 Plus Nanoconvergence Technology Division; Pusan National University; Miryang 627-706 Korea
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45
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Belay A, Kim HK, Hwang YH. Binding of caffeine with caffeic acid and chlorogenic acid using fluorescence quenching, UV/vis and FTIR spectroscopic techniques. LUMINESCENCE 2015; 31:565-572. [DOI: 10.1002/bio.2996] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Revised: 07/08/2015] [Accepted: 07/10/2015] [Indexed: 12/30/2022]
Affiliation(s)
- Abebe Belay
- Department of Nanomaterial Engineering and Nanoconvergence Technology; Pusan National University; Miryang 627-706 Korea
- Department of Physics, School of Natural Sciences; Adama Science and Technology University; P.O.Box 1888 Adama Ethiopia
| | - Hyung Kook Kim
- Department of Nanomaterial Engineering and Nanoconvergence Technology; Pusan National University; Miryang 627-706 Korea
| | - Yoon-Hwae Hwang
- Department of Nanomaterial Engineering and Nanoconvergence Technology; Pusan National University; Miryang 627-706 Korea
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46
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Suhasini M, Sailatha E, Gunasekaran S, Ramkumaar GR. Molecular structure and spectroscopic characterization of Carbamazepine with experimental techniques and DFT quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2015; 141:252-262. [PMID: 25682215 DOI: 10.1016/j.saa.2015.01.059] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2014] [Revised: 11/04/2014] [Accepted: 01/25/2015] [Indexed: 06/04/2023]
Abstract
A systematic vibrational spectroscopic assignment and analysis of Carbamazepine has been carried out by using FT-IR, FT-Raman and UV spectral data. The vibrational analysis were aided by electronic structure calculations - ab initio (RHF) and hybrid density functional methods (B3LYP) performed with standard basis set 6-31G(d,p). Molecular equilibrium geometries, electronic energies, natural bond order analysis, harmonic vibrational frequencies and IR intensities have been computed. A detailed interpretation of the vibrational spectra of the molecule has been made on the basis of the calculated Potential Energy Distribution (PED) by VEDA program. UV-visible spectrum of the compound was also recorded and the electronic properties, such as HOMO and LUMO energies and λmax were determined by HF/6-311++G(d,p) Time-Dependent method. The thermodynamic functions of the title molecule were also performed using the RHF and DFT methods. The restricted Hartree-Fock and density functional theory-based nuclear magnetic resonance (NMR) calculation procedure was also performed, and it was used for assigning the (13)C and (1)H NMR chemical shifts of Carbamazepine.
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Affiliation(s)
- M Suhasini
- PG and Research Department of Physics, Pachaiyappa's College, Chennai 600030, TN, India
| | - E Sailatha
- PG and Research Department of Physics, Pachaiyappa's College, Chennai 600030, TN, India
| | - S Gunasekaran
- Research and Development, St. Peter's Institute of Higher Education and Research, St. Peter's University, Avadi, Chennai 600054, TN, India
| | - G R Ramkumaar
- Department of Physics, C. Kandaswami Naidu College for Men in Anna Nagar East, Chennai 600102, TN, India.
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Ervasti T, Aaltonen J, Ketolainen J. Theophylline-nicotinamide cocrystal formation in physical mixture during storage. Int J Pharm 2015; 486:121-30. [PMID: 25800677 DOI: 10.1016/j.ijpharm.2015.03.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2015] [Revised: 03/06/2015] [Accepted: 03/09/2015] [Indexed: 11/16/2022]
Abstract
Pharmaceutically relevant properties, such as solubility and dissolution rate, of active pharmaceutical ingredients can be enhanced by cocrystal formation. Theophylline and nicotinamide are known to form cocrystals, for example if subjected to solid-state grinding. However, under appropriate conditions, cocrystals can also form in physical mixtures without any mechanical activation. The purpose of this work was to study whether theophylline and nicotinamide could form cocrystals spontaneously, without mechanical activation. Crystalline theophylline and nicotinamide powders were gently mixed manually in a 1:1 molar ratio and stored at different relative humidity and temperature conditions. The solid state of the samples was analyzed by differential scanning calorimetry, Raman spectroscopy and X-ray powder diffractometry. Three different variations of theophylline were used as starting materials, e.g., two size fractions of theophylline anhydrate (large 710 μm-1 mm and small 180-355 μm), and monohydrate (recrystallized from water). As a reference, anhydrous theophylline-nicotinamide cocrystals were prepared by solid-state grinding. The results of this study indicate that theophylline-nicotinamide cocrystals can form without any mechanical activation from physical mixtures of theophylline and nicotinamide during storage. For anhydrous samples, storage humidity was found to be a critical parameter for cocrystal formation. Increasing temperature was also found to have an accelerating effect on the transformation. The effect of particle size of anhydrous theophylline on the transformation rate could not be completely resolved; DSC and Raman indicated slightly faster transformation with a physical mixture prepared from large size fraction of anhydrous theophylline, but the differences were only minor. Cocrystal formation was also observed in the physical mixture prepared from theophylline monohydrate, but the rate was not as high as with samples prepared from anhydrous material.
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Affiliation(s)
- Tuomas Ervasti
- School of Pharmacy, Pharmaceutical Technology, Faculty of Health Sciences, University of Eastern Finland, Kuopio Campus, Finland.
| | - Jaakko Aaltonen
- School of Pharmacy, Pharmaceutical Technology, Faculty of Health Sciences, University of Eastern Finland, Kuopio Campus, Finland
| | - Jarkko Ketolainen
- School of Pharmacy, Pharmaceutical Technology, Faculty of Health Sciences, University of Eastern Finland, Kuopio Campus, Finland
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Prasanth S, Varughese M, Joseph N, Mathew P, Manojkumar T, Sudarsanakumar C. Crystal structure, FT-IR, FT-Raman, 1H NMR and computational study of ethyl 2-{[(Z)3-(4-chlorophenyl)-3-hydroxy-2-propene-1-thione] amino} acetate. J Mol Struct 2015. [DOI: 10.1016/j.molstruc.2014.10.037] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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49
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Renuga Devi TS, Sharmi kumar J, Ramkumaar GR. DFT simulations and vibrational spectra of 2-amino-2-methyl-1,3-propanediol. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2014; 133:214-222. [PMID: 24945862 DOI: 10.1016/j.saa.2014.04.152] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2013] [Revised: 03/02/2014] [Accepted: 04/23/2014] [Indexed: 06/03/2023]
Abstract
The FTIR and FT-Raman spectra of 2-amino-2-methyl-1,3-propanediol were recorded in the regions 4000-400cm(-1) and 4000-50cm(-1) respectively. The structural and spectroscopic data of the molecule in the ground state were calculated using Hartee-Fock and density functional method (B3LYP) with the augmented-correlation consistent-polarized valence double zeta (aug-cc-pVDZ) basis set. The most stable conformer was optimized and the structural and vibrational parameters were determined based on this. The complete assignments were performed on the basis of the Potential Energy Distribution (PED) of the vibrational modes, calculated using Vibrational Energy Distribution Analysis (VEDA) 4 program. With the observed FTIR and FT-Raman data, a complete vibrational assignment and analysis of the fundamental modes of the compound were carried out. Thermodynamic properties and Mulliken charges were calculated using both Hartee-Fock and density functional method using the aug-cc-pVDZ basis set and compared. The calculated HOMO-LUMO energy gap revealed that charge transfer occurs within the molecule. (1)H and (13)C NMR chemical shifts of the molecule were calculated using Gauge-Independent Atomic Orbital (GIAO) method and were compared with experimental results.
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Affiliation(s)
- T S Renuga Devi
- Department of Physics, Women's Christian College, College Road, Chennai 600006, TN, India.
| | - J Sharmi kumar
- P.G. Department of Physics, Women's Christian College, College Road, Chennai 600006, TN, India; Department of Physics, Periyar University, Salem 636011, TN, India
| | - G R Ramkumaar
- Department of Physics, C. Kandaswami Naidu College for Men in Anna Nagar East, Chennai 600102, TN, India
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50
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Spray-dried alginate microparticles carrying caffeine-loaded and potentially bioactive nanoparticles. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.05.040] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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