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Jin Z, Seong HG, Srivastava S, McGlasson A, Emrick T, Muthukumar M, Russell TP. 3D Printing of Aqueous Two-Phase Systems with Linear and Bottlebrush Polyelectrolytes. Angew Chem Int Ed Engl 2024; 63:e202404382. [PMID: 38616164 DOI: 10.1002/anie.202404382] [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: 03/03/2024] [Revised: 04/08/2024] [Accepted: 04/12/2024] [Indexed: 04/16/2024]
Abstract
We formed core-shell-like polyelectrolyte complexes (PECs) from an anionic bottlebrush polymer with poly (acrylic acid) side chains with a cationic linear poly (allylamine hydrochloride). By varying the pH, the number of side chains of the polyanionic BB polymers (Nbb), the charge density of the polyelectrolytes, and the salt concentration, the phase separation behavior and salt resistance of the complexes could be tuned by the conformation of the BBs. By combining the linear/bottlebrush polyelectrolyte complexation with all-liquid 3D printing, flow-through tubular constructs were produced that showed selective transport across the PEC membrane comprising the walls of the tubules. These tubular constructs afford a new platform for flow-through delivery systems.
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Affiliation(s)
- Zichen Jin
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Hong-Gyu Seong
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Satyam Srivastava
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Alex McGlasson
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Todd Emrick
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Murugappan Muthukumar
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
| | - Thomas P Russell
- Materials Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA
- Department of Polymer Science and Engineering Department, University of Massachusetts, 120 Governors Drive, Amherst, MA 01003, USA
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2
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Hilton EM, Jinks MA, Burnett AD, Warren NJ, Wilson AJ. Visible-Light Driven Control Over Triply and Quadruply Hydrogen-Bonded Supramolecular Assemblies. Chemistry 2024; 30:e202304033. [PMID: 38190370 DOI: 10.1002/chem.202304033] [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: 12/04/2023] [Revised: 01/05/2024] [Accepted: 01/08/2024] [Indexed: 01/10/2024]
Abstract
Supramolecular polymers offer tremendous potential to produce new "smart" materials, however, there remains a need to develop systems that are responsive to external stimuli. In this work, visible-light responsive hydrogen-bonded supramolecular polymers comprising photoresponsive supramolecular synthons (I-III) consisting of two hydrogen bonding motifs (HBMs) connected by a central ortho-tetrafluorinated azobenzene have been characterized by DOSY NMR and viscometry. Comparison of different hydrogen-bonding motifs reveals that assembly in the low and high concentration regimes is strongly influenced by the strength of association between the HBMs. I, Incorporating a triply hydrogen-bonded heterodimer, was found to exhibit concentration dependent switching between a monomeric pseudo-cycle and supramolecular oligomer through intermolecular hydrogen bonding interactions between the HBMs. II, Based on the same photoresponsive scaffold, and incorporating a quadruply hydrogen-bonded homodimer was found to form a supramolecular polymer which was dependent upon the ring-chain equilibrium and thus dependent upon both concentration and photochemical stimulus. Finally, III, incorporating a quadruply hydrogen-bonded heterodimer represents the first photoswitchable AB type hydrogen-bonded supramolecular polymer. Depending on the concentration and photostationary state, four different assemblies dominate for both monomers II and III, demonstrating the ability to control supramolecular assembly and physical properties triggered by light.
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Affiliation(s)
- Eleanor M Hilton
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
- School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Michael A Jinks
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
| | - Andrew D Burnett
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Nicholas J Warren
- School of Chemical and Process Engineering, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
| | - Andrew J Wilson
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
- School of Chemistry, University of Birmingham, Edgbaston, Birmingham, B15 2TT, UK
- Astbury Centre for Structural Molecular Biology, University of Leeds, Woodhouse Lane, Leeds, LS2 9JT, UK
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3
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Wu Q, Zhang M, Hu H, Tu Y, Gao P, Li T, Zhang X, Teng J, Wang L. Comparative study on chemical composition, functional properties of dietary fibers prepared from four China cereal brans. Int J Biol Macromol 2024; 257:128510. [PMID: 38043663 DOI: 10.1016/j.ijbiomac.2023.128510] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 11/17/2023] [Accepted: 11/28/2023] [Indexed: 12/05/2023]
Abstract
Comparison of chemical composition and functional properties of insoluble and soluble dietary fiber (IDF, SDF) obtained from four China cereal brans was investigated. With findings, IDFs and SDFs for rice bran (RB), wheat bran (WB), highland barely bran (HBB) and tartary buckwheat bran (TBB) contained several monosaccharides such as arabinose, galactose, glucose, xylose, and galacturonic acid. The RBIDF was shrinking and formed a rugged microscopic structure, while the structure of WBIDF was dense and flat. HBBIDF and TBBIDF showed fold and flake structure. The glucose adsorption capacity of the HBBIDF was highest among all samples, which was 3.2 mmol/g. TBBIDF exhibited the highest value of cholesterol adsorption capacity (10.5 mg/g) at pH 7.0 and maximum binding capacity (BCmax, 365.2 μmol/g) for cadmium at pH 7.0 among all samples, respectively. As a result, HBBIDF and TBBIDF are potential fiber-rich ingredients in functional foods.
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Affiliation(s)
- Qinglan Wu
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Ming Zhang
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Haipeng Hu
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Yi Tu
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Pinhan Gao
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Ting Li
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Xinxia Zhang
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China
| | - Jian Teng
- Shanghai Adfontes Technology Co., Ltd, Caoxi North Road 45, Shanghai 20000, China
| | - Li Wang
- Key Laboratory of Carbohydrate Chemistry & Biotechnology, Ministry of Education, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; National Engineering Laboratory for Cereal Fermentation Technology, School of Food Science and Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China; Jiangsu Provincial Research Center for Bioactive Product Processing Technology, Jiangnan University, Lihu Road 1800, Wuxi 214122, China.
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Abbas G, Tunio AH, Memon KR, Mahesar AA, Memon FH, Abbasi GR. Modification of Cellulose Ether with Organic Carbonate for Enhanced Thermal and Rheological Properties: Characterization and Analysis. ACS OMEGA 2023; 8:25453-25466. [PMID: 37483200 PMCID: PMC10357580 DOI: 10.1021/acsomega.3c02974] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 06/19/2023] [Indexed: 07/25/2023]
Abstract
Reduction in viscosity at higher temperatures is the main limitation of utilizing cellulose ethers in high thermal reservoir conditions for petroleum industry applications. In this study, cellulose ether (hydroxyethyl methyl cellulose (HEMC)) is modified using organic carbonates, i.e., propylene carbonate (PC) and diethyl carbonate (DEC), to overcome the limitation of reduced viscosity at high temperatures. The polymer composites were characterized through various analytical techniques, including Fourier-transform infrared (FTIR), H-NMR, X-ray diffraction (XRD), scanning electron microscope (SEM), thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), ζ-potential measurement, molecular weight determination, and rheology measurements. The experimental results of structural and morphological characterization confirm the modification and formation of a new organic carbonate-based cellulose ether. The thermal analysis revealed that the modified composites have greater stability, as the modified samples demonstrated higher vaporization and decomposition temperatures. ζ-potential measurement indicates higher stability of DEC- and PC-modified composites. The relative viscometry measurement revealed that the modification increased the molecular weight of PC- and DEC-containing polymers, up to 93,000 and 99,000 g/moL, respectively. Moreover, the modified composites exhibited higher levels of stability, shear strength and thermal resistance as confirmed by viscosity measurement through rheology determination. The observed increase in viscosity is likely due to the enhanced inter- and intramolecular interaction and higher molecular weight of modified composites. The organic carbonate performed as a transesterification agent that improves the overall properties of cellulose ether (HEMC) at elevated temperatures as concluded from this study. The modification approach in this study will open the doors to new applications and will be beneficial for substantial development in the petroleum industry.
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Affiliation(s)
- Ghulam Abbas
- Institute
of Petroleum & Natural Gas Engineering, Mehran University of Engineering & Technology, Jamshoro 76062, Sindh, Pakistan
| | - Abdul Haque Tunio
- Institute
of Petroleum & Natural Gas Engineering, Mehran University of Engineering & Technology, Jamshoro 76062, Sindh, Pakistan
| | - Khalil Rehman Memon
- Institute
of Petroleum & Natural Gas Engineering, Mehran University of Engineering & Technology, Jamshoro 76062, Sindh, Pakistan
| | - Aftab Ahmed Mahesar
- Institute
of Petroleum & Natural Gas Engineering, Mehran University of Engineering & Technology, Jamshoro 76062, Sindh, Pakistan
| | - Faisal Hussain Memon
- Department
of Petroleum & Natural Gas Engineering, Mehran University of Engineering & Technology, S.Z.A.B Campus, Khairpur
Mirs 66020, Sindh, Pakistan
| | - Ghazanfer Raza Abbasi
- School
of Engineering, Edith Cowan University, Joondalup, Western Australia 6027, Australia
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5
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Winzor DJ, Dinu V, Scott DJ, Harding SE. Experimental support for reclassification of the light scattering second virial coefficient from macromolecular solutions as a hydrodynamic parameter. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2023; 52:343-352. [PMID: 37460663 PMCID: PMC10444693 DOI: 10.1007/s00249-023-01665-w] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/07/2023] [Revised: 04/12/2023] [Accepted: 05/18/2023] [Indexed: 08/23/2023]
Abstract
This investigation examines the source of the disparity between experimental values of the light scattering second virial coefficient [Formula: see text] (mL.mol/g2) for proteins and those predicted on the statistical mechanical basis of excluded volume. A much better theoretical description of published results for lysozyme is obtained by considering the experimental parameters to monitor the difference between the thermodynamic excluded volume term and its hydrodynamic counterpart. This involves a combination of parameters quantifying concentration dependence of the translational diffusion coefficient obtained from dynamic light scattering measurements. That finding is shown to account for observations of a strong correlation between [Formula: see text] (mL/g), where M2 is the molar mass (molecular weight) of the macromolecule and the diffusion concentration parameter [Formula: see text] (mL/g). On the grounds that [Formula: see text] is regarded as a hydrodynamic parameter, the same status should be accorded the light scattering second virial coefficient rather than its current incorrect thermodynamic designation as [Formula: see text] (mL.mol/g2), or just B, the osmotic second virial coefficient for protein self-interaction.
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Affiliation(s)
- Donald J. Winzor
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane, QLD 4072 Australia
| | - Vlad Dinu
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington, LE12 5RD UK
| | - David J. Scott
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington, LE12 5RD UK
- Research Complex at Harwell, Rutherford Appleton Laboratory, OX11 0FA UK
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington, LE12 5RD UK
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6
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Yarawsky AE, Dinu V, Harding SE, Herr AB. Strong non-ideality effects at low protein concentrations: considerations for elongated proteins. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2023; 52:427-438. [PMID: 37055656 PMCID: PMC10599268 DOI: 10.1007/s00249-023-01648-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2022] [Revised: 03/17/2023] [Accepted: 03/29/2023] [Indexed: 04/15/2023]
Abstract
A recent investigation was aimed at obtaining structural information on a highly extended protein via SEC-MALS-SAXS. Significantly broadened elution peaks were observed, reminiscent of a phenomenon known as viscous fingering. This phenomenon is usually observed above 50 mg/mL for proteins like bovine serum albumin (BSA). Interestingly, the highly extended protein (Brpt5.5) showed viscous fingering at concentrations lower than 5 mg/mL. The current study explores this and other non-ideal behavior, emphasizing the presence of these effects at relatively low concentrations for extended proteins. BSA, Brpt5.5, and a truncated form of Brpt5.5 referred to as Brpt1.5 are studied systematically using size-exclusion chromatography (SEC), sedimentation velocity analytical ultracentrifugation (AUC), and viscosity. The viscous fingering effect is quantified using two approaches and is found to correlate well with the intrinsic viscosity of the proteins-Brpt5.5 exhibits the most severe effect and is the most extended protein tested in the study. By AUC, the hydrodynamic non-ideality was measured for each protein via global analysis of a concentration series. Compared to BSA, both Brpt1.5 and Brpt5.5 showed significant non-ideality that could be easily visualized at concentrations at or below 5 mg/mL and 1 mg/mL, respectively. A variety of relationships were examined for their ability to differentiate the proteins by shape using information from AUC and/or viscosity. Furthermore, these relationships were also tested in the context of hydrodynamic modeling. The importance of considering non-ideality when investigating the structure of extended macromolecules is discussed.
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Affiliation(s)
- Alexander E Yarawsky
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA.
- BioAnalysis, LLC, 3401 I Street Suite 206, Philadelphia, PA, 19134, USA.
| | - Vlad Dinu
- National Centre for Macromolecular Hydrodynamics (NCMH), University of Nottingham, Sutton Bonington, Loughborough, LE12 5RD, UK
| | - Stephen E Harding
- National Centre for Macromolecular Hydrodynamics (NCMH), University of Nottingham, Sutton Bonington, Loughborough, LE12 5RD, UK
| | - Andrew B Herr
- Division of Immunobiology, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
- Division of Infectious Diseases, Cincinnati Children's Hospital Medical Center, Cincinnati, OH, USA
- Department of Pediatrics, University of Cincinnati College of Medicine, Cincinnati, OH, USA
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7
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Fleming PJ, Correia JJ, Fleming KG. Revisiting macromolecular hydration with HullRadSAS. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2023; 52:215-224. [PMID: 36602579 DOI: 10.1007/s00249-022-01627-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 12/22/2022] [Accepted: 12/23/2022] [Indexed: 01/06/2023]
Abstract
Hydration of biological macromolecules is important for their stability and function. Historically, attempts have been made to describe the degree of macromolecular hydration using a single parameter over a narrow range of values. Here, we describe a method to calculate two types of hydration: surface shell water and entrained water. A consideration of these two types of hydration helps to explain the "hydration problem" in hydrodynamics. The combination of these two types of hydration allows accurate calculation of hydrodynamic volume and related macromolecular properties such as sedimentation and diffusion coefficients, intrinsic viscosities, and the concentration-dependent non-ideality identified with sedimentation velocity experiments.
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Affiliation(s)
- Patrick J Fleming
- Thomas C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD, 21218, USA
| | - John J Correia
- Department of Cell and Molecular Biology, University of Mississippi Medical Center, Jackson, MS, 39216, USA
| | - Karen G Fleming
- Thomas C. Jenkins Department of Biophysics, Johns Hopkins University, Baltimore, MD, 21218, USA.
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8
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Philo JS. SEDNTERP: a calculation and database utility to aid interpretation of analytical ultracentrifugation and light scattering data. EUROPEAN BIOPHYSICS JOURNAL : EBJ 2023; 52:233-266. [PMID: 36792822 DOI: 10.1007/s00249-023-01629-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2022] [Revised: 01/16/2023] [Accepted: 01/19/2023] [Indexed: 02/17/2023]
Abstract
Proper interpretation of analytical ultracentrifugation (AUC) data for purified proteins requires ancillary information and calculations to account for factors such as buoyancy, buffer viscosity, hydration, and temperature. The utility program SEDNTERP has been widely used by the AUC community for this purpose since its introduction in the mid-1990s. Recent extensions to this program (1) allow it to incorporate data from diffusion as well as AUC experiments; and (2) allow it to calculate the refractive index of buffer solutions (based on the solute composition of the buffer), as well as the specific refractive increment (dn/dc) of proteins based on their composition. These two extensions should be quite useful to the light scattering community as well as helpful for AUC users. The latest version also adds new terms to the partial specific volume calculations which should improve the accuracy, particularly for smaller proteins and peptides, and can calculate the viscosity of buffers containing heavy isotopes of water. It also uses newer, more accurate equations for the density of water and for the hydrodynamic properties of rods and disks. This article will summarize and review all the equations used in the current program version and the scientific background behind them. It will tabulate the values used to calculate the partial specific volume and dn/dc, as well as the polynomial coefficients used in calculating the buffer density and viscosity (most of which have not been previously published), as well as the new ones used in calculating the buffer refractive index.
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Affiliation(s)
- John S Philo
- Alliance Protein Laboratories, San Diego, CA, USA.
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Dobrynin AV, Sayko R, Colby RH. Viscosity of Polymer Solutions and Molecular Weight Characterization. ACS Macro Lett 2023:773-779. [PMID: 37216466 DOI: 10.1021/acsmacrolett.3c00219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Since the pioneering research by Staudinger on dilute solution viscosity and its relation to the polymer molecular weight, viscosity analysis has become a valuable technique for polymer characterization. The conventional approach is based on the Huggins approximation of the solution-specific viscosity by a quadratic function of concentration, c. We show how to reformulate this approach in a universal form by representing a solution-specific viscosity, ηsp, as a generalized universal function ηsp(c) = α(c/c*) + (1 - α)(c/c*)2 of chain overlap concentration, c*, determined at ηsp = 1, with numerical coefficients α = 0.745 ± 0.005 for good and 0.625 ± 0.008 for a θ solvent. This viscosity representation can be viewed as a calibration curve for molecular weight determination from a measurement of the solution viscosity at a given solution concentration. Furthermore, the molecular weight dependence of the overlap concentration provides a means for quantifying the polymer/solvent affinity and the solvent effect on chain flexibility. The extension of the approach to semidilute solutions opens a path for obtaining molecular weight in a broad concentration range without requiring a dilution and monitoring its change during the polymerization reaction from solution viscosity.
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Affiliation(s)
- Andrey V Dobrynin
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Ryan Sayko
- Department of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Ralph H Colby
- Materials Science and Engineering, Penn State University, University Park, Pennsylvania 16802 United States
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Padilla C, Quero F, Pępczyńska M, Díaz-Calderon P, Acevedo JP, Byres N, Blaker JJ, MacNaughtan W, Williams HEL, Enrione J. Understanding the Molecular Conformation and Viscoelasticity of Low Sol-Gel Transition Temperature Gelatin Methacryloyl Suspensions. Int J Mol Sci 2023; 24:ijms24087489. [PMID: 37108653 PMCID: PMC10139010 DOI: 10.3390/ijms24087489] [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: 03/01/2023] [Revised: 04/06/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
For biomedical applications, gelatin is usually modified with methacryloyl groups to obtain gelatin methacryloyl (GelMA), which can be crosslinked by a radical reaction induced by low wavelength light to form mechanically stable hydrogels. The potential of GelMA hydrogels for tissue engineering has been well established, however, one of the main disadvantages of mammalian-origin gelatins is that their sol-gel transitions are close to room temperature, resulting in significant variations in viscosity that can be a problem for biofabrication applications. For these applications, cold-water fish-derived gelatins, such as salmon gelatin, are a good alternative due to their lower viscosity, viscoelastic and mechanical properties, as well as lower sol-gel transition temperatures, when compared with mammalian gelatins. However, information regarding GelMA (with special focus on salmon GelMA as a model for cold-water species) molecular conformation and the effect of pH prior to crosslinking, which is key for fabrication purposes since it will determine final hydrogel's structure, remains scarce. The aim of this work is to characterize salmon gelatin (SGel) and salmon methacryloyl gelatin (SGelMA) molecular configuration at two different acidic pHs (3.6 and 4.8) and to compare them to commercial porcine gelatin (PGel) and methacryloyl porcine gelatin (PGelMA), usually used for biomedical applications. Specifically, we evaluated gelatin and GelMA samples' molecular weight, isoelectric point (IEP), their molecular configuration by circular dichroism (CD), and determined their rheological and thermophysical properties. Results showed that functionalization affected gelatin molecular weight and IEP. Additionally, functionalization and pH affected gelatin molecular structure and rheological and thermal properties. Interestingly, the SGel and SGelMA molecular structure was more sensitive to pH changes, showing differences in gelation temperatures and triple helix formation than PGelMA. This work suggests that SGelMA presents high tunability as a biomaterial for biofabrication, highlighting the importance of a proper GelMA molecular configuration characterization prior to hydrogel fabrication.
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Affiliation(s)
- Cristina Padilla
- Programa de Doctorado en Biomedicina, Facultad de Medicina, Universidad de los Andes, Santiago 7620086, Chile
- Centro de Investigación e Innovación Biomédica (CIIB), Universidad de los Andes, Santiago 7620086, Chile
- Biopolymer Research and Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620086, Chile
- IMPACT, Center of Interventional Medicine for Precision and Advanced Cellular Therapy, Universidad de los Andes, Santiago 7620086, Chile
| | - Franck Quero
- Laboratorio de Nanocelulosa y Biomateriales, Departamento de Ingeniería Química, Biotecnología y Materiales, Facultad de Ciencias Físicas y Matemáticas, Universidad de Chile, Santiago 8370456, Chile
| | - Marzena Pępczyńska
- Centro de Investigación e Innovación Biomédica (CIIB), Universidad de los Andes, Santiago 7620086, Chile
- Biopolymer Research and Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620086, Chile
| | - Paulo Díaz-Calderon
- Centro de Investigación e Innovación Biomédica (CIIB), Universidad de los Andes, Santiago 7620086, Chile
- Biopolymer Research and Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620086, Chile
| | - Juan Pablo Acevedo
- Centro de Investigación e Innovación Biomédica (CIIB), Universidad de los Andes, Santiago 7620086, Chile
- IMPACT, Center of Interventional Medicine for Precision and Advanced Cellular Therapy, Universidad de los Andes, Santiago 7620086, Chile
| | - Nicholas Byres
- Department of Materials and Henry Royce Institute, The University of Manchester, Manchester M13 9PL, UK
| | - Jonny J Blaker
- Department of Materials and Henry Royce Institute, The University of Manchester, Manchester M13 9PL, UK
- Department of Biomaterials, Institute of Clinical Dentistry, University of Oslo, 0317 Oslo, Norway
| | - William MacNaughtan
- Division of Food, Nutrition and Dietetics, School of Biosciences, Sutton Bonington Campus, University of Nottingham, Loughborough LE12 5RD, UK
| | - Huw E L Williams
- Centre for Biomedical Sciences, University Park, University of Nottingham, Nottingham NR7 2RD, UK
| | - Javier Enrione
- Centro de Investigación e Innovación Biomédica (CIIB), Universidad de los Andes, Santiago 7620086, Chile
- Biopolymer Research and Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620086, Chile
- IMPACT, Center of Interventional Medicine for Precision and Advanced Cellular Therapy, Universidad de los Andes, Santiago 7620086, Chile
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Davydova VN, Krylova NV, Iunikhina OV, Volod'ko AV, Pimenova EA, Shchelkanov MY, Yermak IM. Physicochemical Properties and Antiherpetic Activity of κ-Carrageenan Complex with Chitosan. Mar Drugs 2023; 21:md21040238. [PMID: 37103377 PMCID: PMC10141160 DOI: 10.3390/md21040238] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2023] [Revised: 04/06/2023] [Accepted: 04/12/2023] [Indexed: 04/28/2023] Open
Abstract
Nanoparticles formation is one of the ways to modulate the physicochemical properties and enhance the activity of original polysaccharides. For this purpose, based on the polysaccharide of red algae, κ-carrageenan (κ-CRG), it polyelectrolyte complex (PEC), with chitosan, were obtained. The complex formation was confirmed by ultracentrifugation in a Percoll gradient, with dynamic light scattering. According to electron microscopy and DLS, PEC is dense spherical particles with sizes in the range of 150-250 nm. A decrease in the polydispersity of the initial CRG was detected after the PEC formation. Simultaneous exposure of Vero cells with the studied compounds and herpes simplex virus type 1 (HSV-1) showed that the PEC exhibited significant antiviral activity, effectively inhibiting the early stages of virus-cell interaction. A two-fold increase in the antiherpetic activity (selective index) of PEC compared to κ-CRG was shown, which may be due to a change in the physicochemical characteristics of κ-CRG in PEC.
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Affiliation(s)
- Viktoriya N Davydova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Natalya V Krylova
- G.P. Somov Institute of Epidemiology and Microbiology, Rospotrebnadzor, 690087 Vladivostok, Russia
| | - Olga V Iunikhina
- G.P. Somov Institute of Epidemiology and Microbiology, Rospotrebnadzor, 690087 Vladivostok, Russia
| | - Aleksandra V Volod'ko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
| | - Evgeniya A Pimenova
- A.V. Zhirmunsky National Scientific Center of Marine Biology, Far Eastern Branch, Russian Academy of Sciences, Palchevskogo 17, 690041 Vladivostok, Russia
| | - Mikhail Y Shchelkanov
- G.P. Somov Institute of Epidemiology and Microbiology, Rospotrebnadzor, 690087 Vladivostok, Russia
| | - Irina M Yermak
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far-Eastern Branch of the Russian Academy of Sciences, 690022 Vladivostok, Russia
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12
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Self-association of the glycopeptide antibiotic teicoplanin A2 in aqueous solution studied by molecular hydrodynamics. Sci Rep 2023; 13:1969. [PMID: 36737502 PMCID: PMC9895975 DOI: 10.1038/s41598-023-28740-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 01/24/2023] [Indexed: 02/05/2023] Open
Abstract
The natural glycopeptide antibiotic teicoplanin is used for the treatment of serious Gram-positive related bacterial infections and can be administered intravenously, intramuscularly, topically (ocular infections), or orally. It has also been considered for targeting viral infection by SARS-CoV-2. The hydrodynamic properties of teicoplanin A2 (M1 = 1880 g/mol) were examined in phosphate chloride buffer (pH 6.8, I = 0.10 M) using sedimentation velocity and sedimentation equilibrium in the analytical ultracentrifuge together with capillary (rolling ball) viscometry. In the concentration range, 0-10 mg/mL teicoplanin A2 was found to self-associate plateauing > 1 mg/mL to give a molar mass of (35,400 ± 1000) g/mol corresponding to ~ (19 ± 1) mers, with a sedimentation coefficient s20, w = ~ 4.65 S. The intrinsic viscosity [[Formula: see text]] was found to be (3.2 ± 0.1) mL/g: both this, the value for s20,w and the hydrodynamic radius from dynamic light scattering are consistent with a globular macromolecular assembly, with a swelling ratio through dynamic hydration processes of ~ 2.
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13
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Impact of the solvent properties on molecular interactions and phase behaviour of alginate-gelatin systems. Colloids Surf A Physicochem Eng Asp 2023. [DOI: 10.1016/j.colsurfa.2022.130455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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14
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Comparative hydrodynamic characterisation of two hydroxylated polymers based on α-pinene- or oleic acid-derived monomers for potential use as archaeological consolidants. Sci Rep 2022; 12:18411. [PMID: 36319651 PMCID: PMC9626589 DOI: 10.1038/s41598-022-21027-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/21/2022] [Indexed: 11/07/2022] Open
Abstract
The Oseberg Viking ship burial is one of the most extensive collections of Viking wooden artefacts ever excavated in Norway. In the early twentieth century, many of these artefacts were treated with alum in order to preserve them, inadvertently leading to their current degraded state. It is therefore crucial to develop new bioinspired polymers which could be used to conserve these artefacts and prevent further disintegration. Two hydroxylated polymers were synthesised (TPA6 and TPA7), using α-pinene- and oleic acid-derived monomers functionalised with an acrylate moiety. Characterisation using biomolecular hydrodynamics (analytical ultracentrifugation and high precision viscometry) has shown that these polymers have properties which would potentially make them good wood consolidants. Conformation analyses with the viscosity increment (ν) universal hydrodynamic parameter and ELLIPS1 software showed that both polymers had extended conformations, facilitating in situ networking when applied to wood. SEDFIT-MSTAR analyses of sedimentation equilibrium data indicates a weight average molar mass Mw of (3.9 ± 0.8) kDa and (4.2 ± 0.2) kDa for TPA6 and TPA7 respectively. Analyses with SEDFIT (sedimentation velocity) and MultiSig however revealed that TPA7 had a much greater homogeneity and a lower proportion of aggregation. These studies suggest that both these polymers-particularly TPA7-have characteristics suitable for wood consolidation, such as an optimal molar mass, conformation and a hydroxylated nature, making them interesting leads for further research.
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15
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Molecular Dynamics Investigation of Hyaluronan in Biolubrication. Polymers (Basel) 2022; 14:polym14194031. [PMID: 36235979 PMCID: PMC9571324 DOI: 10.3390/polym14194031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2022] [Revised: 09/06/2022] [Accepted: 09/07/2022] [Indexed: 11/17/2022] Open
Abstract
Aqueous solution of strongly hydrophilic biopolymers is known to exhibit excellent lubrication properties in biological systems, such as the synovial fluid in human joints. Several mechanisms have been proposed on the biolubrication of joints, such as the boundary lubrication and the fluid exudation lubrication. In these models, mechanical properties of synovial fluid containing biopolymers are essential. To examine the role of such biopolymers in lubrication, a series of molecular dynamics simulations with an all-atom classical force field model were conducted for aqueous solutions of hyaluronan (hyaluronic acid, HA) under constant shear. After equilibrating the system, the Lees-Edwards boundary condition was imposed, with which a steady state of uniform shear flow was realized. Comparison of HA systems with hydrocarbon (pentadecane, PD) solutions of similar mass concentration indicates that the viscosity of HA solutions is slightly larger in general than that of PDs, due to the strong hydration of HA molecules. Effects of added electrolyte (NaCl) were also discussed in terms of hydration. These findings suggest the role of HA in biolubirication as a load-supporting component, with its flexible character and strong hydration structure.
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16
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Bonet NF, Cava DG, Vélez M. Quartz crystal microbalance and atomic force microscopy to characterize mimetic systems based on supported lipids bilayer. Front Mol Biosci 2022; 9:935376. [PMID: 35992275 PMCID: PMC9382308 DOI: 10.3389/fmolb.2022.935376] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2022] [Accepted: 07/05/2022] [Indexed: 11/23/2022] Open
Abstract
Quartz Crystal Microbalance (QCM) with dissipation and Atomic Force Microscopy (AFM) are two characterization techniques that allow describing processes taking place at solid-liquid interfaces. Both are label-free and, when used in combination, provide kinetic, thermodynamic and structural information at the nanometer scale of events taking place at surfaces. Here we describe the basic operation principles of both techniques, addressing a non-specialized audience, and provide some examples of their use for describing biological events taking place at supported lipid bilayers (SLBs). The aim is to illustrate current strengths and limitations of the techniques and to show their potential as biophysical characterization techniques.
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17
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Hotchkiss AT, Chau HK, Strahan GD, Nuñez A, Simon S, White AK, Dieng S, Heuberger ER, Yadav MP, Hirsch J. Structural characterization of red beet fiber and pectin. Food Hydrocoll 2022. [DOI: 10.1016/j.foodhyd.2022.107549] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
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18
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Biophysical Reviews’ “meet the editors series”—a profile of Steve Harding’s career in macromolecular hydrodynamics. Biophys Rev 2022; 14:605-610. [DOI: 10.1007/s12551-022-00963-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Accepted: 05/24/2022] [Indexed: 01/14/2023] Open
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19
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A database of calculated solution parameters for the AlphaFold predicted protein structures. Sci Rep 2022; 12:7349. [PMID: 35513443 PMCID: PMC9072687 DOI: 10.1038/s41598-022-10607-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2021] [Accepted: 04/07/2022] [Indexed: 12/22/2022] Open
Abstract
Recent spectacular advances by AI programs in 3D structure predictions from protein sequences have revolutionized the field in terms of accuracy and speed. The resulting “folding frenzy” has already produced predicted protein structure databases for the entire human and other organisms’ proteomes. However, rapidly ascertaining a predicted structure’s reliability based on measured properties in solution should be considered. Shape-sensitive hydrodynamic parameters such as the diffusion and sedimentation coefficients (\documentclass[12pt]{minimal}
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\begin{document}$${s_{{\left( {{20},w} \right)}}^{{0}} }$$\end{document}s20,w0) and the intrinsic viscosity ([η]) can provide a rapid assessment of the overall structure likeliness, and SAXS would yield the structure-related pair-wise distance distribution function p(r) vs. r. Using the extensively validated UltraScan SOlution MOdeler (US-SOMO) suite, a database was implemented calculating from AlphaFold structures the corresponding \documentclass[12pt]{minimal}
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\begin{document}$${s_{{\left( {{20},w} \right)}}^{{0}} }$$\end{document}s20,w0, [η], p(r) vs. r, and other parameters. Circular dichroism spectra were computed using the SESCA program. Some of AlphaFold’s drawbacks were mitigated, such as generating whenever possible a protein’s mature form. Others, like the AlphaFold direct applicability to single-chain structures only, the absence of prosthetic groups, or flexibility issues, are discussed. Overall, this implementation of the US-SOMO-AF database should already aid in rapidly evaluating the consistency in solution of a relevant portion of AlphaFold predicted protein structures.
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20
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Comparative Hydrodynamic Study on Non-Aqueous Soluble Archaeological Wood Consolidants: Butvar B-98 and PDMS-OH Siloxanes. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27072133. [PMID: 35408530 PMCID: PMC9000765 DOI: 10.3390/molecules27072133] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/20/2022] [Revised: 03/16/2022] [Accepted: 03/20/2022] [Indexed: 11/17/2022]
Abstract
Butvar B-98 and PDMS-OH both have a demonstrable ability as consolidants for archaeological wood. This makes them both potential treatment options for the Oseberg collection, which is one of the most important archaeological finds from the Viking era. Both Butvar B-98 and PDMS-OH are soluble in organic solvents, offering a useful alternative to aqueous-based consolidants. Extensive characterisation studies were carried out on both of these polymers, with the use of analytical ultracentrifugation and viscometry, for the benefit of conservators wanting to know more about the physical properties of these materials. Short column sedimentation equilibrium analysis using SEDFIT-MSTAR revealed a weight-average molar mass (weight-average molecular weight) Mw of (54.0 ± 1.5) kDa (kg · mol-1) for Butvar B-98, while four samples of PDMS-OH siloxanes (each with a different molar mass) had an Mw of (52.5 ± 3.0) kDa, (38.8 ± 1.5) kDa, (6.2 ± 0.7) kDa and (1.6 ± 0.1) kDa. Sedimentation velocity confirmed that all polymers were heterogeneous, with a wide range of molar masses. All molecular species showed considerable conformational asymmetry from measurements of intrinsic viscosity, which would facilitate networking interactions as consolidants. It is anticipated that the accumulated data on these two consolidants will enable conservators to make a more informed decision when it comes to choosing which treatment to administer to archaeological artefacts.
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21
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Hellebois T, Fortuin J, Xu X, Shaplov AS, Gaiani C, Soukoulis C. Structure conformation, physicochemical and rheological properties of flaxseed gums extracted under alkaline and acidic conditions. Int J Biol Macromol 2021; 192:1217-1230. [PMID: 34666134 DOI: 10.1016/j.ijbiomac.2021.10.087] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 08/02/2021] [Accepted: 10/12/2021] [Indexed: 11/17/2022]
Abstract
The present work aimed at investigating an extraction protocol based on consecutive steps of isoelectric point (pH ~ 4.25) mediated gum swelling and deproteinisation as an alternative method to produce flaxseed gum extracts of enhanced techno-functional characteristics. The osidic and proximate composition, structure conformation, flow behaviour, dynamic rheological and thermal properties of gums isolated from brown and golden flaxseeds were assessed. Gum extraction under near-to-isoelectric point conditions did not impair the extraction yield, residual protein and ash content, whilst it resulted in minor changes in the sugar composition of the flaxseed gum extracts. The deconvolution of the GPC/SEC chromatographs revealed the presence of four major polysaccharidic populations corresponding to arabinoxylans, rhamnogalacturonan-I and two AX-RG-I composite fractions. The latter appeared to minimise the intra- and interchain polymer non-covalent interactions (hydrogen bonding) leading to a better solvation affinity in water and lyotropic solvents. Golden flaxseed gums exerted higher molecular weight (Mw = 1.34-1.15 × 106 Da) and intrinsic viscosities (6.63-5.13 dL g-1) as well as better thickening and viscoelastic performance than the brown flaxseed gum exemplars. Golden flaxseed gums exhibited a better thermal stability compared to the brown flaxseed counterparts and therefore, they are suitable for product applications involving severe heat treatments.
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Affiliation(s)
- Thierry Hellebois
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, Esch-sur-Alzette L4362, Luxembourg; Université de Lorraine, LIBio, Nancy, France
| | - Jennyfer Fortuin
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, Esch-sur-Alzette L4362, Luxembourg; Trier University of Applied Sciences, Department of Food Technology, Schneidershof, 54293 Trier, Germany
| | - Xuan Xu
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, Esch-sur-Alzette L4362, Luxembourg
| | - Alexander S Shaplov
- Materials Research and Technology (MRT) Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, L4362 Esch-sur-Alzette, Luxembourg
| | - Claire Gaiani
- Université de Lorraine, LIBio, Nancy, France; Institut Universitaire de France (IUF), France
| | - Christos Soukoulis
- Environmental Research and Innovation (ERIN) Department, Luxembourg Institute of Science and Technology (LIST), 5 avenue des Hauts-Fourneaux, Esch-sur-Alzette L4362, Luxembourg.
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22
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Guo L, Yokoyama W, Chen L, Liu F, Chen M, Zhong F. Characterization and physicochemical properties analysis of konjac glucomannan: Implications for structure-properties relationships. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2021.106818] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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23
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Structure and composition of blueberry fiber pectin and xyloglucan that bind anthocyanins during fruit puree processing. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106572] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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24
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Qi PX, Chau HK, Hotchkiss AT. Molecular characterization of the interacting and reacting systems formed by α-lactalbumin and sugar beet pectin. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106490] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Terpene polyacrylate TPA5 shows favorable molecular hydrodynamic properties as a potential bioinspired archaeological wood consolidant. Sci Rep 2021; 11:7343. [PMID: 33795726 PMCID: PMC8016987 DOI: 10.1038/s41598-021-86543-1] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2020] [Accepted: 02/25/2021] [Indexed: 02/01/2023] Open
Abstract
There is currently a pressing need for the development of novel bioinspired consolidants for waterlogged, archaeological wood. Bioinspired materials possess many advantages, such as biocompatibility and sustainability, which makes them ideal to use in this capacity. Based on this, a polyhydroxylated monomer was synthesised from α-pinene, a sustainable terpene feedstock derived from pine trees, and used to prepare a low molar mass polymer TPA5 through free radical polymerisation. This polymer was extensively characterised by NMR spectroscopy (chemical composition) and molecular hydrodynamics, primarily using analytical ultracentrifugation reinforced by gel filtration chromatography and viscometry, in order to investigate whether it would be suitable for wood consolidation purposes. Sedimentation equilibrium indicated a weight average molar mass Mw of (4.3 ± 0.2) kDa, with minimal concentration dependence. Further analysis with MULTISIG revealed a broad distribution of molar masses and this heterogeneity was further confirmed by sedimentation velocity. Conformation analyses with the Perrin P and viscosity increment ν universal hydrodynamic parameters indicated that the polymer had an elongated shape, with both factors giving consistent results and a consensus axial ratio of ~ 4.5. These collective properties-hydrogen bonding potential enhanced by an elongated shape, together with a small injectable molar mass-suggest this polymer is worthy of further consideration as a potential consolidant.
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26
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Asian J, Quenta E, Castillo JL. Do viscosity and wettability of fluoride varnishes affect their fluoride release? J Clin Exp Dent 2021; 13:e221-e226. [PMID: 33680323 PMCID: PMC7920555 DOI: 10.4317/jced.56985] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Accepted: 09/23/2020] [Indexed: 01/18/2023] Open
Abstract
Background There are several brands of fluoride varnishes in the market, but the dynamics of fluoride release from each one might be different. The purpose of this study was to evaluate in vitro the release of fluorides by fluoride varnishes and to determine the correlation with viscosity and wettability.
Material and Methods Forty four enamel blocks 5x5 mm were randomly divided into 4 groups (n=11) ((Duraphat®, Clinpro™ White Varnish, Flúor Protector® and control). We applied 30 milligrams of fluoride varnish to each specimen. The specimens were immersed in a Calcium Phosphate solution at a pH= 6.0. We evaluated the release of fluoride, by using a selective fluoride electrode, during 6 weeks. Viscosity was measured using an Oswald Viscosimeter and the wettability was determined by measuring the contact angle between the varnish and the enamel slab. The statistical analysis was performed using Analysis of variance.
Results Duraphat showed the highest fluoride release from the second weekend beyond (p<0.001) and Clinpro the greatest rate of release. Duraphat release was the steadiest throughout the experiment. Duraphat showed the highest viscosity and the lowest wettability (p<0.001) and Fluor Protector showed the highest wettability (p<0.001). There was a positive correlation between the release of fluoride and the viscosity and a negative correlation between fluoride release and wettability (r>0.7). Conclusions Viscosity and wettability influence the release of fluoride from fluoride varnishes. Key words:Fluorides topical, viscosity, wettability.
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Affiliation(s)
- Jackeline Asian
- Professor, Universidad Peruana Cayetano Heredia, School of Stomatology, Department of Dentistry for Children and Adolescents,Lima, Peru
| | - Edgar Quenta
- Professor, Universidad Peruana Cayetano Heredia, School of Stomatology, Department of Dentistry for Children and Adolescents,Lima, Peru
| | - Jorge L Castillo
- Professor, Universidad Peruana Cayetano Heredia, School of Stomatology, Department of Dentistry for Children and Adolescents,Lima, Peru
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27
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Moisture Effect on Characteristics of Slowly Digestible Potato Starch Prepared under Electron Beam Irradiation. J CHEM-NY 2021. [DOI: 10.1155/2021/6653482] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
This study evaluates the effect of initial moisture contents (11.74–29.84%) on physicochemical changes, in vitro and in vivo digestibilities of potato starch irradiated with electron beam (EB). After a constant dose of EB irradiation, intrinsic viscosity and average molecular weight of potato starch decreased for all investigated moisture contents. When the moisture of starch was lower than 18%, the depolymerization predominated, hence increasing the amylose content. At higher moisture, water can strongly absorb EB and produce highly active species that induced the crosslinking of amylose molecules and the disruption of large crystals into smaller defective crystals. As a result, we found a maximum in amylose content at 14.84% moisture and a minimum in the degree of crystallinity at 17.5% moisture. Thermal stabilities between the irradiated samples were not significantly different. In vitro digestibility results showed that higher moistures during EB treatment induced structural changes that led to the conversion of resistant starch (RS) fraction into slowly digestible starch (SDS). Moreover, an in vivo digestive model in mice showed that EB-treated starch was able to maintain blood glucose at a stable level for a long time. This study showed a potential for SDS production from potato starch using EB irradiation technology, even in large scale.
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Huamaní-Meléndez V, Mauro M, Darros-Barbosa R. Physicochemical and rheological properties of aqueous Tara gum solutions. Food Hydrocoll 2021. [DOI: 10.1016/j.foodhyd.2020.106195] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Protein intrinsic viscosity determination with the Viscosizer TD instrument: reaching beyond the initially expected applications. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2021; 50:587-595. [PMID: 33486532 DOI: 10.1007/s00249-020-01492-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2020] [Revised: 12/03/2020] [Accepted: 12/20/2020] [Indexed: 10/22/2022]
Abstract
Intrinsic viscosity is a key hydrodynamic parameter to understand molecular structure and hydration, as well as intramolecular interactions. Commercially available instruments measure intrinsic viscosity by recording the macromolecular mobility in a capillary. These instruments monitor Taylor dispersion using an absorbance or fluorescence detector. By design, these instruments behave like U-tube viscometers. To our knowledge, there are no studies to date showing that the Viscosizer TD instrument (Malvern-Panalytical) is able to measure the intrinsic viscosity of macromolecules. In this study, we then performed our assays on the Poly(ethylene oxide) polymer (PEO), used classically as a standard for viscometry measurements and on three model proteins: the bovine serum albumin (BSA), the bevacizumab monoclonal antibody, and the RTX Repeat Domain (RD) of the adenylate cyclase toxin of Bordetella pertussis (CyaA). The presence of P20 in the samples is critical to get reliable results. The data obtained with our in-house protocol show a strong correlation with intrinsic viscosity values obtained using conventional techniques. However, with respect to them, our measurements could be performed at relatively low concentrations, between 2 and 5 mg/ml, using only 7 µL per injection. Altogether, our results show that the Viscosizer TD instrument is able to measure intrinsic viscosities in a straightforward manner. This simple and innovative approach should give a new boost to intrinsic viscosity measurements and should reignite the interest of biophysicists, immunologists, structural biologists and other researchers for this key physicochemical parameter.
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Hermansyah H, Eriwati Y, Putriani D, Geraldine K. Peppermint flavor oil in fluoride varnishes enhances fluoride release. SCIENTIFIC DENTAL JOURNAL 2021. [DOI: 10.4103/sdj.sdj_78_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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31
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Manzocco L, Plazzotta S, Calligaris S. Exploring the Potentialities of Photoinduced Glycation to Steer Protein Functionalities: The Study Case of Freeze-Dried Egg White Proteins/Carbohydrates Mixtures. Foods 2020; 10:foods10010026. [PMID: 33374111 PMCID: PMC7823610 DOI: 10.3390/foods10010026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/16/2020] [Accepted: 12/21/2020] [Indexed: 11/16/2022] Open
Abstract
The capacity of UV-C light to induce glycation and modify functional properties of systems containing freeze-dried egg white proteins and carbohydrates with increasing molecular weight (i.e., glucose, maltose, trehalose and maltodextrin) was studied. Color changes induced by light exposure were taken as typical indicators of glycation. Samples were then analyzed for selected physical (critical concentration, particle size and viscosity), chemical (ovalbumin content) and technofunctional properties (gelling temperature and foaming capacity). The presence of sugars during exposure to UV-C light promoted intense browning and decreased ovalbumin content by circa 30%. Concomitantly, up to a 3-fold increase in critical concentration of the aqueous suspensions of the irradiated protein-carbohydrate powders and changes in particle size were detected. These modifications were consistent with the development of non-enzymatic browning reactions upon UV-C light irradiation. Photoinduced glycation was associated to a decrease in viscosity, a tendency to form gel at temperature lower by up to 8 °C and a better capacity of foam stabilization. The intensity of these changes seems to be affected by the nature of the carbohydrates reacting with proteins, with longer carbohydrates able to produce systems with higher foam stability capacity.
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Gudapati H, Parisi D, Colby RH, Ozbolat IT. Rheological investigation of collagen, fibrinogen, and thrombin solutions for drop-on-demand 3D bioprinting. SOFT MATTER 2020; 16:10506-10517. [PMID: 33073269 DOI: 10.1039/d0sm01455a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Collagen, fibrinogen, and thrombin proteins in aqueous buffer solutions are widely used as precursors of natural biopolymers in three-dimensional (3D) bioprinting applications. The proteins are sourced from animals and their quality may vary from batch to batch, inducing differences in the rheological properties of such solutions. In this work, we investigate the rheological response of collagen, fibrinogen, and thrombin protein solutions in bulk and at the solution/air interface. Interfacial rheological measurements show that fibrous collagen, fibrinogen and globular thrombin proteins adsorb and aggregate at the solution/air interface, forming a viscoelastic solid film at the interface. The viscoelastic film corrupts the bulk rheological measurements in rotational rheometers by contributing to an apparent yield stress, which increases the apparent bulk viscosity up to shear rates as high as 1000 s-1. The addition of a non-ionic surfactant, such as polysorbate 80 (PS80) in small amounts between 0.001 and 0.1 v/v%, prevents the formation of the interfacial layer, allowing the estimation of true bulk viscosity of the solutions. The estimation of viscosity not only helps in identifying those protein solutions that are potentially printable with drop-on-demand (DOD) inkjet printing but also detects inconsistencies in flow behavior among the batches.
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Affiliation(s)
- Hemanth Gudapati
- Department of Engineering Science and Mechanics, The Pennsylvania State University, University Park, PA 16802, USA.
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Chun T, MacCalman T, Dinu V, Ottino S, Phillips-Jones MK, Harding SE. Hydrodynamic Compatibility of Hyaluronic Acid and Tamarind Seed Polysaccharide as Ocular Mucin Supplements. Polymers (Basel) 2020; 12:polym12102272. [PMID: 33023220 PMCID: PMC7599781 DOI: 10.3390/polym12102272] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 09/26/2020] [Accepted: 09/28/2020] [Indexed: 11/16/2022] Open
Abstract
Hyaluronic acid (HA) has been commonly used in eyedrop formulations due to its viscous lubricating properties even at low concentration, acting as a supplement for ocular mucin (principally MUC5AC) which diminishes with aging in a condition known as Keratoconjunctivitis sicca or “dry eye”. A difficulty has been its short residence time on ocular surfaces due to ocular clearance mechanisms which remove the polysaccharide almost immediately. To prolong its retention time, tamarind seed gum polysaccharide (TSP) is mixed as a helper biopolymer with HA. Here we look at the hydrodynamic characteristics of HA and TSP (weight average molar mass Mw and viscosity η) and then explore the compatibility of these polymers, including the possibility of potentially harmful aggregation effects. The research is based on a novel combination of three methods: sedimentation velocity in the analytical ultracentrifuge (SV-AUC), size-exclusion chromatography coupled to multiangle light scattering (SEC-MALS) and capillary viscometry. HA and TSP were found to have Mw=(680±30) kg/mol and (830±30) kg/mol respectively, and η=1475±30 ml/g and 675±20 ml/g, respectively. The structure of HA ranges from a rodlike molecule at lower molar masses changing to a random coil for Mw > 800 kg/mol, based on the Mark–Houwink–Kuhn–Sakurada (MHKS) coefficient. TSP, by contrast, is a random coil across the range of molar masses. For the mixed HA-TSP systems, SEC-MALS indicates a weak interaction. However, sedimentation coefficient (s) distributions obtained from SV-AUC measurements together with intrinsic viscosity demonstrated no evidence of any significant aggregation phenomenon, reassuring in terms of eye-drop formulation technology involving these substances.
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Affiliation(s)
- Taewoo Chun
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK; (T.C.); (T.M.); (V.D.)
| | - Thomas MacCalman
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK; (T.C.); (T.M.); (V.D.)
| | - Vlad Dinu
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK; (T.C.); (T.M.); (V.D.)
| | - Sara Ottino
- Farmigea S.P.A, Via G.B. Oliva, 6/8 - 56121 Pisa, Italy;
| | - Mary K. Phillips-Jones
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK; (T.C.); (T.M.); (V.D.)
- Correspondence: (M.K.P.-J.); (S.E.H)
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, University of Nottingham, Sutton Bonington LE12 5RD, UK; (T.C.); (T.M.); (V.D.)
- Cultural History Museum, University of Oslo, Postboks 6762, St. Olavs plass, 0130 Oslo, Norway
- Correspondence: (M.K.P.-J.); (S.E.H)
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The Effect of Different Extraction Conditions on the Physical Properties, Conformation and Branching of Pectins Extracted from Cucumis melo Inodorus. POLYSACCHARIDES 2020. [DOI: 10.3390/polysaccharides1010002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The extraction of pectin involves the physico-chemical hydrolysis and solubilisation of pectic polymers from plant tissues under the influence of several processing parameters. In this study, an experimental design approach was used to examine the effects of extraction pH, time and temperature on the pectins extracted from Cucumis melo Inodorus. Knowledge of physical properties (intrinsic viscosity and molar mass), dilute solution conformation (persistence length and mass per unit length), together with chemical composition, was then used to propose a new method, which can estimate the length and number of branches on the pectin RG-I region. The results show that physical properties, conformation and the length and number of branches are sensitive to extraction conditions. The fitting of regression equations relating length and number of branches on the pectin RG-I region to extraction conditions can, therefore, lead to tailor-made pectins with specific properties for specific applications.
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Mao Y, Millett R, Lee CS, Yakubov G, Harding SE, Binner E. Investigating the influence of pectin content and structure on its functionality in bio-flocculant extracted from okra. Carbohydr Polym 2020; 241:116414. [DOI: 10.1016/j.carbpol.2020.116414] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 04/30/2020] [Accepted: 05/05/2020] [Indexed: 11/28/2022]
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Jiwani SI, Gillis RB, Besong D, Almutairi F, Erten T, Kök MS, Harding SE, Paulsen BS, Adams GG. Isolation and Biophysical Characterisation of Bioactive Polysaccharides from Cucurbita Moschata (Butternut Squash). Polymers (Basel) 2020; 12:polym12081650. [PMID: 32722155 PMCID: PMC7466094 DOI: 10.3390/polym12081650] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Revised: 07/15/2020] [Accepted: 07/22/2020] [Indexed: 11/16/2022] Open
Abstract
Cucurbits are plants that have been used frequently as functional foods. This study includes the extraction, isolation, and characterisation of the mesocarp polysaccharide of Cucurbita moschata. The polysaccharide component was purified by gel filtration into three fractions (NJBTF1, NJBTF2, and NJBTF3) of different molecular weights. Characterisation includes the hydrodynamic properties, identification of monosaccharide composition, and bioactivity. Sedimentation velocity also indicated the presence of small amounts of additional discrete higher molecular weight components even after fractionation. Sedimentation equilibrium revealed respective weight average molecular weights of 90, 31, and 19 kDa, with the higher fractions (NJBTF1 and NJBTF2) indicating a tendency to self-associate. Based on the limited amount of data (combinations of 3 sets of viscosity and sedimentation data corresponding to the 3 fractions), HYDFIT indicates an extended, semi-flexible coil conformation. Of all the fractions obtained, NJBTF1 showed the highest bioactivity. All fractions contained galacturonic acid and variable amounts of neutral sugars. To probe further, the extent of glycosidic linkages in NJBTF1 was estimated using gas chromatography–mass spectrometry (GCMS), yielding a high galacturonic acid content (for pectin polysaccharide) and the presence of fructans—the first evidence of fructans (levan) in the mesocarp. Our understanding of the size and structural flexibility together with the high bioactivity suggests that the polysaccharide obtained from C. moschata has the potential to be developed into a therapeutic agent.
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Affiliation(s)
- Shahwar Imran Jiwani
- Queen’s Medical Centre, Faculty of Medicine and Health Sciences, University of Nottingham, Clifton Boulevard, Nottingham NG7 2UH, UK;
- Correspondence: (S.I.J.); (G.G.A.); Tel.: +44-(0)-115-748-4098 (S.I.J.); +44-(0)-115-823-0901 (G.G.A.)
| | - Richard B. Gillis
- Queen’s Medical Centre, Faculty of Medicine and Health Sciences, University of Nottingham, Clifton Boulevard, Nottingham NG7 2UH, UK;
| | - David Besong
- Solar and Photovoltaics Engineering Center, King Abdullah University of Science and Technology, Thuwal, Makkah 23955-6900, Saudi Arabia;
| | - Fahad Almutairi
- Department of Biochemistry, Faculty of Science, University of Tabuk, P.O. Box 741, Tabuk 71491, Saudi Arabia;
| | - Tayyibe Erten
- Department of Nutrition and Dietetics, Faculty of Health Sciences, Bayburt University, 69000 Bayburt, Turkey;
| | - M. Samil Kök
- Department of Food Engineering, Faculty of Engineering & Architecture, Abant Izzet Baysal University, Gölköy, 14300 Bolu, Turkey;
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics (NCMH), School of Biosciences, Sutton Bonington Campus, The University of Nottingham, Sutton Bonington, Leicestershire LE12 5RD, UK;
| | - Berit S. Paulsen
- Department of Pharmaceutical Chemistry, School of Pharmacy, Section Pharmacognosy, University of Oslo, PB 1068, Blindern, N-0316 Oslo, Norway;
| | - Gary G. Adams
- Queen’s Medical Centre, Faculty of Medicine and Health Sciences, University of Nottingham, Clifton Boulevard, Nottingham NG7 2UH, UK;
- Correspondence: (S.I.J.); (G.G.A.); Tel.: +44-(0)-115-748-4098 (S.I.J.); +44-(0)-115-823-0901 (G.G.A.)
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Enrione J, Char C, Pepczynska M, Padilla C, González-Muñoz A, Olguín Y, Quinzio C, Iturriaga L, Díaz-Calderón P. Rheological and Structural Study of Salmon Gelatin with Controlled Molecular Weight. Polymers (Basel) 2020; 12:E1587. [PMID: 32709001 PMCID: PMC7407307 DOI: 10.3390/polym12071587] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2020] [Revised: 07/12/2020] [Accepted: 07/13/2020] [Indexed: 11/21/2022] Open
Abstract
This study explores the molecular structuring of salmon gelatin (SG) with controlled molecular weight produced from salmon skin, and its relationship with its thermal and rheological properties. SG was produced under different pH conditions to produce samples with well-defined high (SGH), medium (SGM), and low (SGL) molecular weight. These samples were characterized in terms of their molecular weight (MW, capillary viscometry), molecular weight distribution (electrophoresis), amino acid profile, and Raman spectroscopy. These results were correlated with thermal (gelation energy) and rheological properties. SGH presented the higher MW (173 kDa) whereas SGL showed shorter gelatin polymer chains (MW < 65 kDa). Raman spectra and gelation energy suggest that amount of helical structures in gelatin is dependent on the molecular weight, which was well reflected by the higher viscosity and G' values for SGH. Interestingly, for all the molecular weight and molecular configuration tested, SG behaved as a strong gel (tan δ < 1), despite its low viscosity and low gelation temperature (3-10 °C). Hence, the molecular structuring of SG reflected directly on the thermal and viscosity properties, but not in terms of the viscoelastic strength of gelatin produced. These results give new insights about the relationship among structural features and macromolecular properties (thermal and rheological), which is relevant to design a low viscosity biomaterial with tailored properties for specific applications.
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Affiliation(s)
- Javier Enrione
- Biopolymer Research & Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620001, Chile; (J.E.); (M.P.); (C.P.); (A.G.-M.)
- Centro de Investigación e Innovación Biomédica, Facultad de Medicina, Universidad de los Andes, Santiago 7620001, Chile
| | - Cielo Char
- Departamento de Ciencias de los Alimentos y Tecnología Química, Facultad de Ciencias Químicas y Farmacéuticas, Universidad de Chile, Santiago 8380494, Chile;
| | - Marzena Pepczynska
- Biopolymer Research & Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620001, Chile; (J.E.); (M.P.); (C.P.); (A.G.-M.)
- Centro de Investigación e Innovación Biomédica, Facultad de Medicina, Universidad de los Andes, Santiago 7620001, Chile
| | - Cristina Padilla
- Biopolymer Research & Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620001, Chile; (J.E.); (M.P.); (C.P.); (A.G.-M.)
- Centro de Investigación e Innovación Biomédica, Facultad de Medicina, Universidad de los Andes, Santiago 7620001, Chile
| | - Adrian González-Muñoz
- Biopolymer Research & Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620001, Chile; (J.E.); (M.P.); (C.P.); (A.G.-M.)
- Centro de Investigación e Innovación Biomédica, Facultad de Medicina, Universidad de los Andes, Santiago 7620001, Chile
| | - Yusser Olguín
- Centro Científico Tecnoloógico de Valparaíso (CCTVal), Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile;
- Centro de Biotecnología (CB-DAL), Universidad Técnica Federico Santa María, Valparaíso 2390123, Chile
| | - Claudia Quinzio
- Centro de Investigación en Biofísica Aplicada y Alimentos (CIBAAL), CONICET-Universidad Nacional de Santiago del Estero, Santiago del Estero 4200, Argentina; (C.Q.); (L.I.)
| | - Laura Iturriaga
- Centro de Investigación en Biofísica Aplicada y Alimentos (CIBAAL), CONICET-Universidad Nacional de Santiago del Estero, Santiago del Estero 4200, Argentina; (C.Q.); (L.I.)
| | - Paulo Díaz-Calderón
- Biopolymer Research & Engineering Laboratory (BIOPREL), Escuela de Nutrición y Dietética, Facultad de Medicina, Universidad de Los Andes, Santiago 7620001, Chile; (J.E.); (M.P.); (C.P.); (A.G.-M.)
- Centro de Investigación e Innovación Biomédica, Facultad de Medicina, Universidad de los Andes, Santiago 7620001, Chile
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Casier R, Duhamel J. Effect of Structure on Polypeptide Blobs: A Model Study Using Poly(l-lysine). LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2020; 36:7980-7990. [PMID: 32585108 DOI: 10.1021/acs.langmuir.0c01347] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
The conformation of a series of pyrene-labeled poly(l-lysine)s (Py-PLLs) in 60:40 and 90:10 (v/v) acetonitrile:water mixtures was determined by comparing the results obtained from the fluorescence blob model (FBM) analysis of their fluorescence decays with those obtained from molecular mechanics optimizations (MMOs). PLL aggregates formed in both solutions as demonstrated by FRET experiments between naphthalene- and pyrene-labeled PLLs. Addition of an excess of unlabeled PLL allowed the conformational study of isolated Py-PLL embedded in a matrix of unlabeled PLLs. By varying the acetonitrile (ACN) content of the solution from 60 to 90 vol % ACN, Py-PLL was found to undergo a conformational change from a random coil to an α-helix. The conformational change induced an increase in the maximum number of lysines (Nblob) separating two pyrene-labeled lysines that could still form an excimer between an excited- and a ground-state pyrene. Nblob obtained from the FBM analysis increased from 15.2 ± 2.1 to 25.2 ± 1.2 lysines as PLL changed its conformation from a random coil to an α-helix. AFM revealed that the α-helical PLLs organized themselves into structured bundles ∼22 nm in diameter. The FBM analysis of the decays acquired with a solution of aggregated Py-PLLs in a 90:10 ACN:water mixture yielded a larger Nblob value of 36.6 ± 3.4. The increase in Nblob indicated that the Py-PLL constructs could now interact with one another in the helical bundles. This increase in Nblob was then used in conjunction with MMOs to determine an interhelical spacing of 2.9 ± 0.1 nm for Py-PLLs in a bundle. This interhelical spacing resulted in a local density of 0.25 ± 0.01 g·cm-3 for the bundles of PLL α-helices, which was a reasonable density for a protein in solution. This study describes an experimental means to probe the number of amino acids that interact with each other as the conformation of a polypeptide evolves from that of a random coil to that of an α-helix to finally that of a bundle of α-helices.
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Affiliation(s)
- Remi Casier
- Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
| | - Jean Duhamel
- Institute for Polymer Research, Waterloo Institute for Nanotechnology, Department of Chemistry, University of Waterloo, Waterloo, Ontario N2L3G1, Canada
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Beji O, Gillis RB, Dinu V, Jiwani SI, Gyasi-Antwi P, Fisk ID, Meal A, Morgan PS, Harding SE, Huang S, Agugini G, Fedele F, Adams GG. Exploration of temperature and shelf-life dependency of the therapeutically available Insulin Detemir. Eur J Pharm Biopharm 2020; 152:340-347. [PMID: 32446962 DOI: 10.1016/j.ejpb.2020.05.016] [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: 10/29/2019] [Revised: 05/11/2020] [Accepted: 05/17/2020] [Indexed: 10/24/2022]
Abstract
PURPOSE Insulin, in typical use, undergoes multiple changes in temperature; from refrigerator, to room temperature, to body temperature. Although long-term storage temperature has been well-studied, the short term changes to insulin are yet to be determined. Insulin detemir (IDet) is a clinically available, slow-acting, synthetic analogue characterised by the conjugation of a C14 fatty acid. The function of this modification is to cause the insulin to form multi-hexameric species, thus retarding the pharmacokinetic rate of action. In this investigation, the temperature dependence properties of this synthetic analogue is probed, as well as expiration. METHODS Dynamic light scattering (DLS) and viscometry were employed to assess the effect of temperature upon IDet. Mass spectrometry was also used to probe the impact of shelf-life and the presence of certain excipients. RESULTS IDet was compared with eight other insulins, including human recombinant, three fast-acting analogues and two other slow-acting analogues. Of all nine insulins, IDet was the only analogue to show temperature dependent behaviour, between 20 °C and 37 °C, when probed with non-invasive backscatter dynamic light scattering. Upon further investigation, IDet observed significant changes in size related to temperature, direction of temperature (heated/cooled) and expiration with cross-correlation observed amongst all 4 parameters. CONCLUSIONS These findings are critical to our understanding of the behaviour of this particular clinically relevant drug, as it will allow the development of future generations of peptide-based therapies with greater clinical efficacy.
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Affiliation(s)
- Oritsegidenene Beji
- University of Nottingham, School of Biosciences, Sutton Bonington Campus, Leicestershire, UK
| | - Richard B Gillis
- University of Nottingham, School of Health Sciences, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK.
| | - Vlad Dinu
- University of Nottingham, School of Biosciences, Sutton Bonington Campus, Leicestershire, UK; University of Nottingham, National Centre for Macromolecular Hydrodynamics, Sutton Bonington Campus, Leicestershire, UK
| | - Shahwar I Jiwani
- University of Nottingham, School of Health Sciences, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Philemon Gyasi-Antwi
- University of Nottingham, School of Health Sciences, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Ian D Fisk
- University of Nottingham, School of Biosciences, Sutton Bonington Campus, Leicestershire, UK
| | - Andrew Meal
- University of Nottingham, School of Health Sciences, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Paul S Morgan
- University of Nottingham, School of Medicine, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Stephen E Harding
- University of Nottingham, School of Biosciences, Sutton Bonington Campus, Leicestershire, UK; University of Nottingham, National Centre for Macromolecular Hydrodynamics, Sutton Bonington Campus, Leicestershire, UK; Universitetet I Oslo, Postboks 6762, St. Olavs plass, 0130 Oslo, Norway
| | - Sha Huang
- University of Nottingham, School of Biosciences, Sutton Bonington Campus, Leicestershire, UK
| | - Giulia Agugini
- University of Pavia, Department of Drug Sciences, Pavia, Italy
| | - Federica Fedele
- University of Salento, Piazzetta Tancredi 7, 73100 Lecce, Italy
| | - Gary G Adams
- University of Nottingham, School of Health Sciences, Faculty of Medicine and Health Sciences, Queens Medical Centre, Clifton Boulevard, Nottingham, UK.
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Li X, Lu Y, Adams GG, Zobel H, Ballance S, Wolf B, Harding SE. Characterisation of the molecular properties of scleroglucan as an alternative rigid rod molecule to xanthan gum for oropharyngeal dysphagia. Food Hydrocoll 2020; 101:105446. [PMID: 32255886 PMCID: PMC7015278 DOI: 10.1016/j.foodhyd.2019.105446] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Scleroglucan, a neutral β(1–3) glucan with β(1–6) glucan branches every third residue, is being considered as an alternative rod-like, shear thinning high molecular weight β-glucan based polysaccharide to xanthan gum for the management of patients with oropharyngeal dysphagia. It is therefore important to understand more fully its hydrodynamic properties in solution, in particular heterogeneity, molecular weight distribution and its behaviour in the presence of mucin glycoproteins. A commercially purified scleroglucan preparation produced by fermentation of the filamentous fungus Sclerotium rolfsii was analysed in deionised distilled water with 0.02% added azide. Sedimentation velocity in the analytical ultracentrifuge showed the scleroglucan preparation to be unimodal at concentrations >0.75 mg/ml which resolved into two components at lower concentration and with partial reversibility between the components. Sedimentation coefficient versus concentration plots showed significant hydrodynamic non-ideality. Self-association behaviour was confirmed by sedimentation equilibrium experiments with molecular weights between ~3 × 106 g/mol to ~5 × 106 g/mol after correcting for thermodynamic non-ideality. SEC-MALS-viscosity experiments showed a transition between a rod-shape at lower molar masses to a more flexible structure at higher masses consistent with previous observations. Sedimentation velocity experiments also showed no evidence for potentially problematic interactions with submaxillary mucin. Scleroglucan considered as alternative to xanthan. Sedimentation velocity shows partial reversible self-association. Associative behaviour confirmed by sedimentation equilibrium. SEC-MALS and viscosity show transition between a rod to more flexible structure. No problematic interactions with submaxillary mucin.
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Affiliation(s)
- Xinxin Li
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
- Division of Food, Nutrition and Dietectics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - Yudong Lu
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
| | - Gary G. Adams
- School of Health Sciences, University of Nottingham, Queen's Medical Centre, Nottingham, NG7 2HA, UK
| | - Hanne Zobel
- Nofima AS, Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Simon Ballance
- Nofima AS, Norwegian Institute of Food, Fisheries and Aquaculture Research, Ås, Norway
| | - Bettina Wolf
- Division of Food, Nutrition and Dietectics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
- Corresponding author.
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK
- Kulturhistorisk Museum, Universitetet i Oslo, Postboks 6762, St. Olavs Plass, 0130, Oslo, Norway
- Corresponding author. National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Loughborough, LE12 5RD, UK.
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García de la Torre J, Hernández Cifre J. Hydrodynamic Properties of Biomacromolecules and Macromolecular Complexes: Concepts and Methods. A Tutorial Mini-review. J Mol Biol 2020; 432:2930-2948. [DOI: 10.1016/j.jmb.2019.12.027] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 11/30/2019] [Accepted: 12/13/2019] [Indexed: 01/08/2023]
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Clinically Relevant Insulin Degludec and its Interaction with Polysaccharides: A Biophysical Examination. Polymers (Basel) 2020; 12:polym12020390. [PMID: 32050432 PMCID: PMC7077624 DOI: 10.3390/polym12020390] [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: 11/01/2019] [Revised: 01/28/2020] [Accepted: 01/30/2020] [Indexed: 11/17/2022] Open
Abstract
Protein polysaccharide complexes have been widely studied for multiple industrial applications and are popular due to their biocompatibility. Insulin degludec, an analogue of human insulin, exists as di-hexamer in pharmaceutical formulations and has the potential to form long multi-hexamers in physiological environment, which dissociate into monomers to bind with receptors on the cell membrane. This study involved complexation of two negatively charged bio-polymers xanthan and alginate with clinically-relevant insulin degludec (PIC). The polymeric complexations and interactions were investigated using biophysical methods. Intrinsic viscosity [η] and particle size distribution (PSD) of PIC increased significantly with an increase in temperature, contrary to the individual components indicating possible interactions. [η] trend was X > XA > PIC > A > IDeg. PSD trend was X > A > IDeg > XA > PIC. Zeta (ζ)- potential (with general trend of IDeg < A < XA < X ≈ PIC) revealed stable interaction at lower temperature which gradually changed with an increase in temperature. Likewise, sedimentation velocity indicated stable complexation at lower temperature. With an increase in time and temperature, changes in the number of peaks and area under curve were observed for PIC. Conclusively, stable complexation occurred among the three polymers at 4 °C and 18 °C and the complex dissociated at 37 °C. Therefore, the complex has the potential to be used as a drug delivery vehicle.
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Amano Y, Ohta S, Sakura KL, Ito T. Pemetrexed-conjugated hyaluronan for the treatment of malignant pleural mesothelioma. Eur J Pharm Sci 2019; 138:105008. [DOI: 10.1016/j.ejps.2019.105008] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2019] [Revised: 07/04/2019] [Accepted: 07/10/2019] [Indexed: 01/27/2023]
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Zendeboodi F, Farahnaky A, Gholian MM. Structural changes and stress relaxation behavior of κ-carrageenan cold-processed gels: Effects of ultrasonication time and power. J Texture Stud 2019; 50:465-473. [PMID: 31206693 DOI: 10.1111/jtxs.12457] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Revised: 05/23/2019] [Accepted: 05/31/2019] [Indexed: 01/06/2023]
Abstract
Ultrasound has been used for cold gelation of κ-carrageenan hydrocolloid. In this work, the effect of ultrasound conditions such as power (50-150 W) and time (20-240 s) of sonication has been investigated. The application of ultrasound to hydrocolloid dispersion caused an increase in water solubility. The texture profile analysis test was used in order to evaluate the mechanical properties of gels. Textural parameters of κ-carrageenan gels, enhanced with increasing sonication time and power up to a certain level (usually 2.5 min) and longer sonication times had negative effects. In addition, intrinsic viscosities of sonicated specimens were measured to investigate the molecular characteristics of all samples. An increase in the process time and power reduced the intrinsic viscosity. The microstructural observation by scanning electron microscope determined that applying power ultrasound on κ-carrageenan dispersions influenced the formation of gel networks significantly.
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Affiliation(s)
- Fetemeh Zendeboodi
- Research Institute of Food Science and Technology (RIFST), Mashhad, Iran
| | - Asgar Farahnaky
- Department of Food Science and Technology, School of Agriculture, Shiraz University, Shiraz, Iran
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Dinu V, Gadon A, Hurst K, Lim M, Ayed C, Gillis RB, Adams GG, Harding SE, Fisk ID. An enzymatically controlled mucoadhesive system for enhancing flavour during food oral processing. NPJ Sci Food 2019; 3:11. [PMID: 31304283 PMCID: PMC6602951 DOI: 10.1038/s41538-019-0043-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2019] [Accepted: 04/30/2019] [Indexed: 11/26/2022] Open
Abstract
While a good mucoadhesive biopolymer must adhere to a mucus membrane, it must also have a good unloading ability. Here, we demonstrate that the biopolymer pullulan is partially digested by human salivary α-amylase, thus acting as a controlled release system, in which the enzyme triggers an increased release of flavour. Our oral processing simulations have confirmed an increase in the bioavailability of aroma and salt compounds as a function of oral pullulan degradation, although the release kinetics suggest a rather slow process. One of the greatest challenges in flavour science is to retain and rapidly unload the bioactive aroma and taste compounds in the oral cavity before they are ingested. By developing a cationic pullulan analogue we have, in theory, addressed the "loss through ingestion" issue by facilitating the adhesion of the modified polymer to the oral mucus, to retain more of the flavour in the oral cavity. Dimethylaminoethyl pullulan (DMAE-pullulan) was synthesised for the first time, and shown to bind submaxillary mucin, while still retaining its susceptibility to α-amylase hydrolysis. Although DMAE-pullulan is not currently food grade, we suggest that the synthesis of a sustainable food grade alternative would be a next generation mucoadhesive targeted for the oral cavity.
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Affiliation(s)
- Vlad Dinu
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
| | - Arthur Gadon
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
| | - Katherine Hurst
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
| | - Mui Lim
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
| | - Charfedinne Ayed
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
| | - Richard B. Gillis
- School of Health Sciences, Faculty of Medicine and Health Sciences, Queen’s Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Gary G. Adams
- School of Health Sciences, Faculty of Medicine and Health Sciences, Queen’s Medical Centre, Clifton Boulevard, Nottingham, UK
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
- Universitetet i Oslo, Postboks 6762, St. Olavs plass, 0130 Oslo, Norway
| | - Ian D. Fisk
- Division of Food, Nutrition and Dietetics, School of Biosciences, University of Nottingham, Sutton Bonington Campus, Leicestershire, UK
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Fishman ML, Chau HK, Hotchkiss AT, White A, Garcia RA, Cooke PH. Effect of long term cold storage and microwave extraction time on the physical and chemical properties of citrus pectin. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2018.12.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Comparison of chain conformation properties of bio-active fucosylated chondroitin sulfates from two different sea cucumbers. Int J Biol Macromol 2019; 133:44-50. [DOI: 10.1016/j.ijbiomac.2019.04.080] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2019] [Revised: 04/04/2019] [Accepted: 04/11/2019] [Indexed: 01/17/2023]
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Structural, Physicochemical, and Functional Properties of Electrolyzed Cassava Starch. INTERNATIONAL JOURNAL OF FOOD SCIENCE 2019; 2019:9290627. [PMID: 31192252 PMCID: PMC6525864 DOI: 10.1155/2019/9290627] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Revised: 03/15/2019] [Accepted: 04/03/2019] [Indexed: 11/18/2022]
Abstract
Cassava starch was oxidized using the electrolysis system. Sodium chloride was added to this system at various concentrations from 0.5 to 5.0 % (w/v). The whiteness of modified starches proportionally increased based on the NaCl concentration and human eyes could recognize the difference of color. Under treatment, dents occurred on the surface of starch granule. Concentration of carbonyl and carboxyl groups was increased compared to native starch. Based on X-ray diffraction pattern, oxidized starch kept its A-type. Besides, the ratios of alpha-helix/amorphous regions remained indicating oxidation reaction mainly subjected on amorphous region. Intrinsic viscosity was used to indirectly calculate the average molecular weight of sample. Furthermore, results showed that average molecular weight was significantly reduced (from 2.09-fold to 13.22-fold) based on the reacting NaCl concentration. The increase of NaCl content related to the increase of retrogradation of treated starches. At various temperatures (30-95°C), swelling factor and clarity reflected negative and positive correlations to NaCl concentration.
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Qi PX, Chau HK, Hotchkiss AT. Molecular characterization of interacting complexes and conjugates induced by the dry-state heating of β-lactoglobulin and sugar beet pectin. Food Hydrocoll 2019. [DOI: 10.1016/j.foodhyd.2019.01.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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