101
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Abdelhameed AS, Adams GG, Morris GA, Almutairi FM, Duvivier P, Conrath K, Harding SE. A glycoconjugate of Haemophilus influenzae Type b capsular polysaccharide with tetanus toxoid protein: hydrodynamic properties mainly influenced by the carbohydrate. Sci Rep 2016; 6:22208. [PMID: 26915577 PMCID: PMC4768162 DOI: 10.1038/srep22208] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2015] [Accepted: 02/03/2016] [Indexed: 11/08/2022] Open
Abstract
Three important physical properties which may affect the performance of glycoconjugate vaccines against serious disease are molar mass (molecular weight), heterogeneity (polydispersity), and conformational flexibility in solution. The dilute solution behaviour of native and activated capsular polyribosylribitol (PRP) polysaccharides extracted from Haemophilus influenzae type b (Hib), and the corresponding glycoconjugate made by conjugating this with the tetanus toxoid (TT) protein have been characterized and compared using a combination of sedimentation equilibrium and sedimentation velocity in the analytical ultracentrifuge with viscometry. The weight average molar mass of the activated material was considerably reduced (Mw ~ 0.24 × 10(6) g.mol(-1)) compared to the native (Mw ~ 1.2 × 10(6) g.mol(-1)). Conjugation with the TT protein yielded large polydisperse structures (of Mw ~ 7.4 × 10(6) g.mol(-1)), but which retained the high degree of flexibility of the native and activated polysaccharide, with frictional ratio, intrinsic viscosity, sedimentation conformation zoning behaviour and persistence length all commensurate with highly flexible coil behaviour and unlike the previously characterised tetanus toxoid protein (slightly extended and hydrodynamically compact structure with an aspect ratio of ~3). This non-protein like behaviour clearly indicates that it is the carbohydrate component which mainly influences the physical behaviour of the glycoconjugate in solution.
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Affiliation(s)
- Ali Saber Abdelhameed
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
- Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, P.O. Box 2457, Riyadh 11451, Saudi Arabia
| | - Gary G. Adams
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
- Insulin and Diabetes Experimental Research (IDER) Group, University of Nottingham, Faculty of Medicine and Health Science, Clifton Boulevard, Nottingham, NG7 2RD UK
| | - Gordon A. Morris
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
- Department of Chemical Sciences, School of Applied Science, University of Huddersfield, Queensgate, Huddersfield, HD1 3DH, UK
| | - Fahad M. Almutairi
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
| | - Pierre Duvivier
- GSK Vaccines, Rue de l’Institut 89, B-1330 Rixensart, Belgium
| | - Karel Conrath
- GSK Vaccines, Rue de l’Institut 89, B-1330 Rixensart, Belgium
| | - Stephen E. Harding
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
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102
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O'Sullivan J, Murray B, Flynn C, Norton I. The effect of ultrasound treatment on the structural, physical and emulsifying properties of animal and vegetable proteins. Food Hydrocoll 2016. [DOI: 10.1016/j.foodhyd.2015.02.009] [Citation(s) in RCA: 209] [Impact Index Per Article: 26.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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103
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Long-term degradation study of hyaluronic acid in aqueous solutions without protection against microorganisms. Carbohydr Polym 2016; 137:664-668. [DOI: 10.1016/j.carbpol.2015.10.101] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Revised: 10/27/2015] [Accepted: 10/31/2015] [Indexed: 12/20/2022]
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104
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Gonçalves AD, Alexander C, Roberts CJ, Spain SG, Uddin S, Allen S. The effect of protein concentration on the viscosity of a recombinant albumin solution formulation. RSC Adv 2016. [DOI: 10.1039/c5ra21068b] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The effect of protein concentration on solution viscosity in a commercially available biopharmaceutical formulation of recombinant albumin (rAlbumin) was studied.
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Affiliation(s)
| | - Cameron Alexander
- School of Pharmacy
- The University of Nottingham
- University Park
- Nottingham
- UK
| | - Clive J. Roberts
- School of Pharmacy
- The University of Nottingham
- University Park
- Nottingham
- UK
| | - Sebastian G. Spain
- School of Pharmacy
- The University of Nottingham
- University Park
- Nottingham
- UK
| | | | - Stephanie Allen
- School of Pharmacy
- The University of Nottingham
- University Park
- Nottingham
- UK
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105
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Guo R, Cao N, Wu Y, Wu J. Optimized extraction and molecular characterization of polysaccharides from Sophora alopecuroides L. seeds. Int J Biol Macromol 2016; 82:231-42. [DOI: 10.1016/j.ijbiomac.2015.10.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 08/19/2015] [Accepted: 10/01/2015] [Indexed: 01/23/2023]
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106
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Ruiz-Fernández AR, López-Cascales JJ, Giner-Casares JJ, Araya-Maturana R, Díaz-Baños FG, Muñoz-Gacitúa D, Weiss-López BE. Effect of shape and bending modulus on the properties of nematic lyotropic liquid crystals. RSC Adv 2016. [DOI: 10.1039/c5ra24019k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Variation in the structure of the molecular aggregate associated with the increase of the TTAC concentration in the liquid crystal.
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Affiliation(s)
| | - J. J. López-Cascales
- Uni. Politécnica de Cartagena
- Grupo de Bioinformática y Macromoléculas (BioMac)
- 30203 Cartagena
- Spain
| | - J. J. Giner-Casares
- CIC biomaGUNE
- Biofunctional Nanomaterials – Laboratory 6 Parque tecnológico de San Sebastián
- 20009 Donostia – San Sebastián
- Spain
| | | | - F. G. Díaz-Baños
- Uni. de Murcia
- Fac. de Química
- Dep. de Química Física
- 30100 Espinardo
- Spain
| | - D. Muñoz-Gacitúa
- Uni. de Chile
- Fac. de Ciencias
- Departamento de Química
- Santiago
- Chile
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107
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Mateos-Gil P, Tsortos A, Vélez M, Gizeli E. Monitoring structural changes in intrinsically disordered proteins using QCM-D: application to the bacterial cell division protein ZipA. Chem Commun (Camb) 2016; 52:6541-4. [DOI: 10.1039/c6cc02127a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Characterization of structural changes in an intrinsically disordered protein attached on a QCM-D, with a sensitivity of 1.8 nm or better.
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Affiliation(s)
- Pablo Mateos-Gil
- Instituto de Catálisis y Petroleoquímica (ICP-CSIC)
- 28049 Madrid
- Spain
| | | | - Marisela Vélez
- Instituto de Catálisis y Petroleoquímica (ICP-CSIC)
- 28049 Madrid
- Spain
| | - Electra Gizeli
- Institute of Molecular Biology & Biotechnology
- Heraklion
- Greece
- Department of Biology
- University of Crete
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108
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Hahn DK, Aragon SR. Intrinsic Viscosity of Proteins and Platonic Solids by Boundary Element Methods. J Chem Theory Comput 2015; 2:1416-28. [PMID: 26626849 DOI: 10.1021/ct600062y] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The boundary element (BE) method is used to implement a very precise computation of the intrinsic viscosity for rigid molecules of arbitrary shape. The formulation, included in our program BEST, is tested against the analytical Simha formula for ellipsoids of revolution, and the results are essentially numerically exact. Previously unavailable, very precise results for a series of Platonic solids are also presented. The formulation includes the optional determination of the center of viscosity; however, for globular proteins, the difference compared to the computation based on the centroid is insignificant. The main application is to a series of 30 proteins ranging in molecular weight from 12 to 465 kD. The computation starts from the crystal structure as obtained from the Protein Data Bank, and a hydration thickness of 1.1 Å obtained in previous work with BEST was used. The results (extrapolated to an infinite number of triangular boundary elements) for the proteins are separated into two groups: monomeric and multimeric proteins. The agreement with experimental measurements of the intrinsic viscosity in the case of monomeric proteins is excellent and within experimental error of 5%, demonstrating that the solution and crystal structure are hydrodynamically equivalent. However, for some multimeric proteins, we observe strong systematic deviations around -20%, which we interpret as a systematic deviation of the solution structure from the crystal structure. A possible description of the structural change is deduced by using simple ellipsoid model parameters. A method to obtain intrinsic viscosity values for proteins to 1-2% accuracy (better than experimental error) on the basis of a single BE computation (avoiding the need for an extrapolation on the number of surface triangles) is also presented.
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Affiliation(s)
- David K Hahn
- Department of Chemistry and Biochemistry, San Francisco State University, 1600 Holloway Ave., San Francisco, California 94132
| | - Sergio R Aragon
- Department of Chemistry and Biochemistry, San Francisco State University, 1600 Holloway Ave., San Francisco, California 94132
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109
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Almutairi FM, Cifre JGH, Adams GG, Kök MS, Mackie AR, de la Torre JG, Harding SE. Application of recent advances in hydrodynamic methods for characterising mucins in solution. EUROPEAN BIOPHYSICS JOURNAL: EBJ 2015; 45:45-54. [DOI: 10.1007/s00249-015-1075-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2015] [Revised: 07/31/2015] [Accepted: 08/13/2015] [Indexed: 10/22/2022]
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110
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Hesarinejad M, Razavi SM, Koocheki A. Alyssum homolocarpum seed gum: Dilute solution and some physicochemical properties. Int J Biol Macromol 2015; 81:418-26. [DOI: 10.1016/j.ijbiomac.2015.08.019] [Citation(s) in RCA: 53] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2015] [Revised: 08/06/2015] [Accepted: 08/09/2015] [Indexed: 11/26/2022]
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111
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Mondek J, Kalina M, Simulescu V, Pekař M. Thermal degradation of high molar mass hyaluronan in solution and in powder; comparison with BSA. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2015.06.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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112
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Viscosity Analysis of Dual Variable Domain Immunoglobulin Protein Solutions: Role of Size, Electroviscous Effect and Protein-Protein Interactions. Pharm Res 2015; 33:155-66. [DOI: 10.1007/s11095-015-1772-5] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Accepted: 08/07/2015] [Indexed: 10/23/2022]
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113
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The effect of starch modification and concentration on steady-state and dynamic rheology of meat emulsions. Food Hydrocoll 2015. [DOI: 10.1016/j.foodhyd.2015.02.002] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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114
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Sartuqui J, D’ Elía N, Gravina AN, Messina PV. Analyzing the hydrodynamic and crowding evolution of aqueous hydroxyapatite-gelatin networks: Digging deeper into bone scaffold design variables. Biopolymers 2015; 103:393-405. [DOI: 10.1002/bip.22645] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2014] [Revised: 03/05/2015] [Accepted: 03/06/2015] [Indexed: 11/07/2022]
Affiliation(s)
- Javier Sartuqui
- Department of Chemistry; Universidad Nacional del Sur; (8000) Bahía Blanca Argentina INQUISUR-CONICET
| | - Noelia D’ Elía
- Department of Chemistry; Universidad Nacional del Sur; (8000) Bahía Blanca Argentina INQUISUR-CONICET
| | - A. Noel Gravina
- Department of Chemistry; Universidad Nacional del Sur; (8000) Bahía Blanca Argentina INQUISUR-CONICET
| | - Paula V. Messina
- Department of Chemistry; Universidad Nacional del Sur; (8000) Bahía Blanca Argentina INQUISUR-CONICET
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115
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Majzoobi M, Seifzadeh N, Farahnaky A, Mesbahi G. Effects of Sonication on Physical Properties of Native and Cross-Linked Wheat Starches. J Texture Stud 2015. [DOI: 10.1111/jtxs.12119] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Affiliation(s)
- Mahsa Majzoobi
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz 7144165186 Iran
| | - Negin Seifzadeh
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz 7144165186 Iran
| | - Asgar Farahnaky
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz 7144165186 Iran
- School of Biomedical Sciences, Graham Centre for Agricultural Innovation and Functional Grain Centre; Charles Sturt University; Wagga Wagga New South Wales Australia
| | - Gholamreza Mesbahi
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz 7144165186 Iran
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116
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117
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Filippova EV, Kuhn ML, Osipiuk J, Kiryukhina O, Joachimiak A, Ballicora MA, Anderson WF. A novel polyamine allosteric site of SpeG from Vibrio cholerae is revealed by its dodecameric structure. J Mol Biol 2015; 427:1316-1334. [PMID: 25623305 DOI: 10.1016/j.jmb.2015.01.009] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 01/08/2015] [Accepted: 01/12/2015] [Indexed: 01/20/2023]
Abstract
Spermidine N-acetyltransferase, encoded by the gene speG, catalyzes the initial step in the degradation of polyamines and is a critical enzyme for determining the polyamine concentrations in bacteria. In Escherichia coli, studies have shown that SpeG is the enzyme responsible for acetylating spermidine under stress conditions and for preventing spermidine toxicity. Not all bacteria contain speG, and many bacterial pathogens have developed strategies to either acquire or silence it for pathogenesis. Here, we present thorough kinetic analyses combined with structural characterization of the VCA0947 SpeG enzyme from the important human pathogen Vibrio cholerae. Our studies revealed the unexpected presence of a previously unknown allosteric site and an unusual dodecameric structure for a member of the Gcn5-related N-acetyltransferase superfamily. We show that SpeG forms dodecamers in solution and in crystals and describe its three-dimensional structure in several ligand-free and liganded structures. Importantly, these structural data define the first view of a polyamine bound in an allosteric site of an N-acetyltransferase. Kinetic characterization of SpeG from V. cholerae showed that it acetylates spermidine and spermine. The behavior of this enzyme is complex and exhibits sigmoidal curves and substrate inhibition. We performed a detailed non-linear regression kinetic analysis to simultaneously fit families of substrate saturation curves to uncover a simple kinetic mechanism that explains the apparent complexity of this enzyme. Our results provide a fundamental understanding of the bacterial SpeG enzyme, which will be key toward understanding the regulation of polyamine levels in bacteria during pathogenesis.
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Affiliation(s)
- Ekaterina V Filippova
- Center for Structural Genomics of Infectious Diseases, Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Misty L Kuhn
- Center for Structural Genomics of Infectious Diseases, Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Jerzy Osipiuk
- Biosciences Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Olga Kiryukhina
- Center for Structural Genomics of Infectious Diseases, Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA
| | - Andrzej Joachimiak
- Biosciences Division, Argonne National Laboratory, Argonne, IL 60439, USA
| | - Miguel A Ballicora
- Department of Chemistry and Biochemistry, Loyola University Chicago, Chicago, IL 60626, USA
| | - Wayne F Anderson
- Center for Structural Genomics of Infectious Diseases, Department of Biochemistry and Molecular Genetics, Northwestern University Feinberg School of Medicine, Chicago, IL 60611, USA.
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118
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Davydova VN, Volod'ko AV, Sokolova EV, Chusovitin EA, Balagan SA, Gorbach VI, Galkin NG, Yermak IM, Solov'eva TF. The supramolecular structure of LPS-chitosan complexes of varied composition in relation to their biological activity. Carbohydr Polym 2015; 123:115-21. [PMID: 25843841 DOI: 10.1016/j.carbpol.2015.01.028] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Revised: 01/13/2015] [Accepted: 01/15/2015] [Indexed: 10/24/2022]
Abstract
The complexes of chitosan (Ch) with lipopolysaccharides (LPSs) from Escherichia coli O55:B5 (E-LPS) and Yersinia pseudotuberculosis 1B 598 (Y-LPS) of various weight compositions were investigated using quasi-elastic light scattering, ζ-potential distribution assay and atomic force microscopy. The alteration of ζ-potential of E-LPS-Ch complexes from negative to positive values depending on Ch content was detected. The Y-LPS-Ch complexes had similar positive ζ-potentials regardless of Ch content. The transformation of the supramolecular structure of E-LPS after binding with to Ch was revealed. Screening of E-LPS and Y-LPS particles by Ch in the complexes with high polycation was detected. The ability of LPS-Ch complex to induce biosynthesis of TNF-α and reactive oxygen species in stimulated human mononuclear cells was studied. A significant decrease in activity complexes compared to that of the initial LPS was observed only for E-LPS-Ch complexes.
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Affiliation(s)
- V N Davydova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia.
| | - A V Volod'ko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia
| | - E V Sokolova
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia
| | - E A Chusovitin
- Institute of Automation and Control Processes, Far Eastern Branch of Russian Academy of Sciences, Radio Str. 5, Vladivostok 690041, Russia
| | - S A Balagan
- Institute of Automation and Control Processes, Far Eastern Branch of Russian Academy of Sciences, Radio Str. 5, Vladivostok 690041, Russia
| | - V I Gorbach
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia
| | - N G Galkin
- Institute of Automation and Control Processes, Far Eastern Branch of Russian Academy of Sciences, Radio Str. 5, Vladivostok 690041, Russia; Far Eastern Federal University, Sukhanova Str. 8, Vladivostok 690091, Russia
| | - I M Yermak
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia
| | - T F Solov'eva
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of Russian Academy of Sciences, Prospect 100 let Vladivostoku 159, Vladivostok 690022, Russia
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119
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Harding SE, Adams GG, Almutairi F, Alzahrani Q, Erten T, Samil Kök M, Gillis RB. Ultracentrifuge Methods for the Analysis of Polysaccharides, Glycoconjugates, and Lignins. Methods Enzymol 2015; 562:391-439. [DOI: 10.1016/bs.mie.2015.06.043] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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120
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Harding SE, Abdelhameed AS, Gillis RB, Morris GA, Adams GG. Characterization of Capsular Polysaccharides and Their Glycoconjugates by Hydrodynamic Methods. Methods Mol Biol 2015; 1331:211-227. [PMID: 26169743 DOI: 10.1007/978-1-4939-2874-3_13] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Hydrodynamic methods are relevant for the characterization of carbohydrates such as capsular bacterial polysaccharides or glycoconjugates in solution. This chapter focuses on the following hydrodynamic methods: sedimentation velocity analytical ultracentrifugation (SV AUC), dynamic light scattering (DLS), sedimentation equilibrium analytical ultracentrifugation (SE AUC), size exclusion chromatography coupled to multi-angle light scattering (SEC-MALS), and capillary viscometry-intrinsic viscosity measurement. The chapter highlights the general principle of these five methods, describes experimental details, and specifies advances in the last years.
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Affiliation(s)
- Stephen E Harding
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington Campus, Sutton Bonington, LE12 5RD, UK,
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121
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Merlani M, Koyama Y, Sato H, Geng L, Barbakadze V, Chankvetadze B, Nakano T. Ring-opening polymerization of a 2,3-disubstituted oxirane leading to a polyether having a carbonyl–aromatic π-stacked structure. Polym Chem 2015. [DOI: 10.1039/c4py01711k] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ring-opening polymerization of a 2,3-disubstituted oxirane afforded a polyether exhibiting intramolecular charge-transfer (ICT) interactions due to a carbonyl–aromatic π-stacked conformation.
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Affiliation(s)
- Maia Merlani
- Catalysis Research Center (CRC) and Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Sapporo 001-0021
- Japan
- Kutateladze Institute of Pharmacochemistry
| | - Yasuhito Koyama
- Catalysis Research Center (CRC) and Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Sapporo 001-0021
- Japan
| | | | - Li Geng
- Catalysis Research Center (CRC) and Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Sapporo 001-0021
- Japan
| | - Vakhtang Barbakadze
- Kutateladze Institute of Pharmacochemistry
- Tbilisi State Medical University
- 0159 Tbilisi
- Georgia
| | - Bezhan Chankvetadze
- Department of Physical and Analytical Chemistry
- School of Exact and Natural Sciences
- Tbilisi State University
- 0179 Tbilisi
- Georgia
| | - Tamaki Nakano
- Catalysis Research Center (CRC) and Graduate School of Chemical Sciences and Engineering
- Hokkaido University
- Sapporo 001-0021
- Japan
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122
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Simulescu V, Mondek J, Kalina M, Pekař M. Kinetics of long-term degradation of different molar mass hyaluronan solutions studied by SEC-MALLS. Polym Degrad Stab 2015. [DOI: 10.1016/j.polymdegradstab.2014.12.005] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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123
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Khabaz F, Khare R. Effect of chain architecture on the size, shape, and intrinsic viscosity of chains in polymer solutions: A molecular simulation study. J Chem Phys 2014; 141:214904. [DOI: 10.1063/1.4902052] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Affiliation(s)
- Fardin Khabaz
- Department of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, USA
| | - Rajesh Khare
- Department of Chemical Engineering, Texas Tech University, Box 43121, Lubbock, Texas 79409-3121, USA
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124
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Erten T, Adams GG, Foster TJ, Harding SE. Comparative heterogeneity, molecular weights and viscosities of xanthans of different pyruvate and acetate content. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2014.04.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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125
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Blayo C, Puentes-Rivas D, Picart-Palmade L, Chevalier-Lucia D, Lange R, Dumay E. Binding of retinyl acetate to whey proteins or phosphocasein micelles: Impact of pressure-processing on protein structural changes and ligand embedding. Food Res Int 2014. [DOI: 10.1016/j.foodres.2014.09.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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126
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Morris GA, Adams GG, Harding SE. On hydrodynamic methods for the analysis of the sizes and shapes of polysaccharides in dilute solution: A short review. Food Hydrocoll 2014. [DOI: 10.1016/j.foodhyd.2014.04.014] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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127
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Effect of mixing speed and time on some textural and physicochemical properties of wheat starch gels. J FOOD ENG 2014. [DOI: 10.1016/j.jfoodeng.2014.06.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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128
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129
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Almutairi FM, Erten T, Adams GG, Hayes M, McLoughlin P, Kök MŞ, Mackie AR, Rowe AJ, Harding SE. Hydrodynamic characterisation of chitosan and its interaction with two polyanions: DNA and xanthan. Carbohydr Polym 2014; 122:359-66. [PMID: 25817680 DOI: 10.1016/j.carbpol.2014.09.090] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Revised: 09/22/2014] [Accepted: 09/25/2014] [Indexed: 11/25/2022]
Abstract
Chitosan, a soluble polycationic derivative of insoluble chitin, has been widely considered for use in the food, cosmetic and pharmaceutical industries. Commercial ("C") and in-house laboratory ("L") prepared chitosan samples extracted from crustaceous shells with different molecular weight and degrees of acetylation (25% and 15%) were compared with regards to (i) weight-average molecular weight (Mw); (ii) sedimentation coefficient (s(o)(20,w)) distribution, and (iii) intrinsic viscosity ([η]). These parameters were estimated using a combination of analytical ultracentrifugation (AUC), size exclusion chromatography coupled to multi-angle laser light scattering (SEC-MALS) and differential pressure viscometry. Polydisperse distributions were seen from sedimentation coefficient distributions and elution profiles from SEC-MALS. Mw values obtained for each sample by sedimentation equilibrium measurements were in excellent agreement with those obtained from SEC-MALS. Mark-Houwink-Kuhn-Sakurada (MHKS) and Wales van Holde analyses of the data all suggest a semi-flexible conformation. The principle of co-sedimentation was then used to monitor the interactions of the two different molecular weights of L chitosans with two polyanions, DNA and xanthan (another double helical high molecular weight molecule). Interactions were clearly observed and then quantified from the changes in the sedimentation coefficient distribution of the mixture compared to unmixed controls using sedimentation velocity. The interactions appeared to show a strong dependence on molecular weight. The relevance of this for DNA condensation applications is indicated.
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Affiliation(s)
- Fahad M Almutairi
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington, LE12 5RD, UK
| | - Tayyibe Erten
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington, LE12 5RD, UK
| | - Gary G Adams
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington, LE12 5RD, UK; Insulin and Diabetes Experimental Research (IDER) Group, University of Nottingham, Faculty of Medicine and Health Science, Clifton Boulevard, Nottingham, NG7 2RD, UK
| | - Maria Hayes
- Food BioSciences Department, Teagasc, The Irish Agricultural and Food Development Authority, Ashtown, Dublin 15, Republic of Ireland
| | - Pádraig McLoughlin
- Food BioSciences Department, Teagasc, The Irish Agricultural and Food Development Authority, Ashtown, Dublin 15, Republic of Ireland
| | - M Şamil Kök
- Department of Food Engineering, Abant Izzet Baysal University, Bolu, Turkey
| | - Alan R Mackie
- Institute of Food Research, Norwich Research Park, Colney Lane, UK
| | - Arthur J Rowe
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington, LE12 5RD, UK
| | - Stephen E Harding
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington, LE12 5RD, UK.
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130
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Small deformation viscoelastic and thermal behaviours of pomegranate seed pips CMC gels. Journal of Food Science and Technology 2014; 52:4186-95. [PMID: 26139883 DOI: 10.1007/s13197-014-1469-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 06/18/2014] [Accepted: 07/02/2014] [Indexed: 10/25/2022]
Abstract
The current investigation presents an exploration in phase behaviour of carboxymethyl cellulose (CMC) produced from pomegranate seed pips compared to low and high viscosity CMCs (LMCMC and HMCMC) primarily at low solid concentrations. Cellulose was extracted with 10 % NaOH at 35 °C for 22 h from pomegranate seed pips and converted to CMC by etherification process. Thermomechanical analysis and micro-imaging were carried out using small deformation dynamic oscillation in shear, modulated differential scanning calorimetry (MDSC) and scanning electron microscopy (SEM). The results emphasize the importance of molecular interaction and the degree of substitution in produced CMC. Thermal gravimetric analysis (TGA) thermograms showed an initial weight loss in pomegranate seed pips CMC (PSCMC) sample, which we attribute to presence of amount of moisture in sample powder. MDSC analysis of PSCMC showed five different peaks at 84, 104, 173, 307 and 361 °C. Moreover, G' and G" changes were found to be dependent on both concentration and frequency. The results of frequency sweep and tan δ indicate that PSCMC solutions can be classified as weak gels.
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131
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The limitations of an exclusively colloidal view of protein solution hydrodynamics and rheology. Biophys J 2014; 105:2418-26. [PMID: 24268154 DOI: 10.1016/j.bpj.2013.10.012] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2013] [Revised: 10/10/2013] [Accepted: 10/15/2013] [Indexed: 11/22/2022] Open
Abstract
Proteins are complex macromolecules with dynamic conformations. They are charged like colloids, but unlike colloids, charge is heterogeneously distributed on their surfaces. Here we overturn entrenched doctrine that uncritically treats bovine serum albumin (BSA) as a colloidal hard sphere by elucidating the complex pH and surface hydration-dependence of solution viscosity. We measure the infinite shear viscosity of buffered BSA solutions in a parameter space chosen to tune competing long-range repulsions and short-range attractions (2 mg/mL ≤ [BSA] ≤ 500 mg/mL and 3.0 ≤ pH ≤ 7.4). We account for surface hydration through partial specific volume to define volume fraction and determine that the pH-dependent BSA intrinsic viscosity never equals the classical hard sphere result (2.5). We attempt to fit our data to the colloidal rheology models of Russel, Saville, and Schowalter (RSS) and Krieger-Dougherty (KD), which are each routinely and successfully applied to uniformly charged suspensions and to hard-sphere suspensions, respectively. We discover that the RSS model accurately describes our data at pH 3.0, 4.0, and 5.0, but fails at pH 6.0 and 7.4, due to steeply rising solution viscosity at high concentration. When we implement the KD model with the maximum packing volume fraction as the sole floating parameter while holding the intrinsic viscosity constant, we conclude that the model only succeeds at pH 6.0 and 7.4. These findings lead us to define a minimal framework for models of crowded protein solution viscosity wherein critical protein-specific attributes (namely, conformation, surface hydration, and surface charge distribution) are addressed.
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132
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Qi PX, Chau HK, Fishman ML, Wickham ED, Hotchkiss AT. Investigation of molecular interactions between β-lactoglobulin and sugar beet pectin by multi-detection HPSEC. Carbohydr Polym 2014; 107:198-208. [DOI: 10.1016/j.carbpol.2014.02.080] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 02/15/2014] [Accepted: 02/24/2014] [Indexed: 12/23/2022]
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133
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Abodinar A, Smith AM, Morris GA. A novel method to estimate the stiffness of carbohydrate polyelectrolyte polymers based on the ionic strength dependence of zeta potential. Carbohydr Polym 2014; 112:6-9. [PMID: 25129709 DOI: 10.1016/j.carbpol.2014.05.063] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 05/22/2014] [Accepted: 05/23/2014] [Indexed: 10/25/2022]
Abstract
Polysaccharides have received a great deal of attention from, for example, the food, cosmetic and pharmaceutical industries. Their conformations (flexibility/stiffness) span a wide range of conformational flexibilities with large hydrated volumes, these properties are important in relation to polysaccharide structure-function relationships. Perhaps the simplest parameter available to estimate the dilute solution conformation of polysaccharides is the Smidsrød-Haug stiffness parameter (B) where the stiffness of polyelectrolytes can be estimated by measuring the intrinsic viscosity at a number of different ionic strengths. In this paper we propose an alternative method for estimating the Smidsrød-Haug stiffness parameter (B) using the ionic strength dependency of zeta potential. For this purpose we have studied a number of different polysaccharides.
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Affiliation(s)
- Atiga Abodinar
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK
| | - Alan M Smith
- Department of Pharmacy, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK
| | - Gordon A Morris
- Department of Chemical Sciences, School of Applied Sciences, University of Huddersfield, Huddersfield HD1 3DH, UK.
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134
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Nakano T. Tricks of Light on Helices: Transformation of Helical Polymers by Photoirradiation. CHEM REC 2014; 14:369-85. [DOI: 10.1002/tcr.201300042] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2013] [Indexed: 11/09/2022]
Affiliation(s)
- Tamaki Nakano
- Catalysis Research Center; Hokkaido University; Sapporo 001-0021 Japan
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135
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Yao Y, Luo S, Liu T. Determination of the Length, Diameter, Molecular Mass, Density and Surfactant Adsorption of SWCNTs in Dilute Dispersion by Intrinsic Viscosity, Sedimentation, and Diffusion Measurements. Macromolecules 2014. [DOI: 10.1021/ma5003497] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yanbo Yao
- High-Performance
Materials
Institute, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida 32310, United States
| | - Sida Luo
- High-Performance
Materials
Institute, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida 32310, United States
| | - Tao Liu
- High-Performance
Materials
Institute, FAMU-FSU College of Engineering, Florida State University, 2525 Pottsdamer Street, Tallahassee, Florida 32310, United States
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136
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Effects of acetic acid and lactic acid on physicochemical characteristics of native and cross-linked wheat starches. Food Chem 2014; 147:312-7. [DOI: 10.1016/j.foodchem.2013.09.148] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 05/23/2013] [Accepted: 09/29/2013] [Indexed: 11/20/2022]
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137
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Wang Y, Sakamoto T, Koyama Y, Takanashi Y, Kumaki J, Cui J, Wan X, Nakano T. Photo-induced helix–helix transition of a polystyrene derivative. Polym Chem 2014. [DOI: 10.1039/c3py01492d] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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138
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Watanabe K, Koyama Y, Suzuki N, Fujiki M, Nakano T. Gigantic chiroptical enhancements in polyfluorene copolymers bearing bulky neomenthyl groups: importance of alternating sequences of chiral and achiral fluorene units. Polym Chem 2014. [DOI: 10.1039/c3py01442h] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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139
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Rust P, Cereghetti D, Dual J. A micro-liter viscosity and density sensor for the rheological characterization of DNA solutions in the kilo-hertz range. LAB ON A CHIP 2013; 13:4794-4799. [PMID: 24154924 DOI: 10.1039/c3lc50857a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
When measuring the properties of fluids from biological sources, sample volumes in the micro-liter range are often desired as higher volumes may not be available or are very expensive. Miniaturized viscosity and density sensors based on a vibrating cantilever fulfill this requirement. In this paper, the possibility of measuring viscosity and density of DNA solutions at the same time using such a sensor is shown. The sensor requires a sample volume of 10 μl. By doing a titration of a solution containing 110 bp long strands of DNA in the diluted, Newtonian regime, the intrinsic viscosity can be determined to be 0.047 ml mg(-1) using the cantilever sensor. The cantilever is also tested with solutions of 10 kbp long strands with concentrations in the semi-dilute, non-Newtonian regime. The comparably small change in resonance frequency and damping observed using these solutions at 12.5 kHz is attributed to shear thinning, which is expected when extrapolating results from other groups.
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Affiliation(s)
- Philipp Rust
- Department of Mechanical and Process Engineering, Institute of Mechanical Systems, ETH Zurich, CH-8092, Zurich, Switzerland.
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140
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Majzoobi M, Beparva P, Farahnaky A, Badii F. Effects of malic acid and citric acid on the functional properties of native and cross-linked wheat starches. STARCH-STARKE 2013. [DOI: 10.1002/star.201300188] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mahsa Majzoobi
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz Iran
| | - Paniz Beparva
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz Iran
| | - Asgar Farahnaky
- Department of Food Science and Technology; School of Agriculture; Shiraz University; Shiraz Iran
| | - Fojan Badii
- Department of Food Engineering and Postharvest Technology; Agricultural Engineering Research Institute; Karaj Iran
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141
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Grupi A, Minton AP. Concentration-dependent viscosity of binary and ternary mixtures of nonassociating proteins: measurement and analysis. J Phys Chem B 2013; 117:13861-5. [PMID: 24131130 DOI: 10.1021/jp406530r] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Using a recently developed automated viscometer (Grupi, A.; Minton, A. P. Anal. Chem. 2012, 84, 10732-10736), the dependence of solution viscosity upon the concentrations of bovine serum albumin, hen egg ovomucoid, and human fibrinogen have been measured individually and in binary and ternary mixtures over a wide range of compositions and at total concentrations of up to 300 g/L. The concentration dependence of viscosity of all solutions is quantitatively described over the entire range of concentrations and compositions by a semiempirical equation requiring specification of only two composition-independent global parameters per protein.
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Affiliation(s)
- Asaf Grupi
- Section on Physical Biochemistry, Laboratory of Biochemistry and Genetics, National Institute of Diabetes, Digestive, and Kidney Diseases, National Institutes of Health, U.S. Department of Health and Human Services , Building 8, Room 226, Bethesda, Maryland 20892-0830, United States
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142
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Lu Y, An L, Wang ZG. Intrinsic Viscosity of Polymers: General Theory Based on a Partially Permeable Sphere Model. Macromolecules 2013. [DOI: 10.1021/ma400872s] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yuyuan Lu
- State Key Laboratory of Polymer
Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.R.China
| | - Lijia An
- State Key Laboratory of Polymer
Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, P.R.China
| | - Zhen-Gang Wang
- Division of Chemistry and Chemical
Engineering, California Institute of Technology, Pasadena, California 91125, United States
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143
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Cartagena A, Hernando-Pérez M, Carrascosa JL, de Pablo PJ, Raman A. Mapping in vitro local material properties of intact and disrupted virions at high resolution using multi-harmonic atomic force microscopy. NANOSCALE 2013; 5:4729-4736. [PMID: 23598736 DOI: 10.1039/c3nr34088k] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
Understanding the relationships between viral material properties (stiffness, strength, charge density, adhesion, hydration, viscosity, etc.), structure (protein sub-units, genome, surface receptors, appendages), and functions (self-assembly, stability, disassembly, infection) is of significant importance in physical virology and nanomedicine. Conventional Atomic Force Microscopy (AFM) methods have measured a single physical property such as the stiffness of the entire virus from nano-indentation at a few points which severely limits the study of structure-property-function relationships. We present an in vitro dynamic AFM technique operating in the intermittent contact regime which synthesizes anharmonic Lorentz-force excited AFM cantilevers to map quantitatively at nanometer resolution the local electro-mechanical force gradient, adhesion, and hydration layer viscosity within individual φ29 virions. Furthermore, the changes in material properties over the entire φ29 virion provoked by the local disruption of its shell are studied, providing evidence of bacteriophage depressurization. The technique significantly generalizes recent multi-harmonic theory (A. Raman, et al., Nat. Nanotechnol., 2011, 6, 809-814) and enables high-resolution in vitro quantitative mapping of multiple material properties within weakly bonded viruses and nanoparticles with complex structure that otherwise cannot be observed using standard AFM techniques.
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Affiliation(s)
- Alexander Cartagena
- Birck Nanotechnology Center & School of Mechanical Engineering, Purdue University, West Lafayette, IN 47907, USA
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144
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Almutairi FM, Adams GG, Kök MS, Lawson CJ, Gahler R, Wood S, Foster TJ, Rowe AJ, Harding SE. An analytical ultracentrifugation based study on the conformation of lambda carrageenan in aqueous solution. Carbohydr Polym 2013; 97:203-9. [PMID: 23769538 DOI: 10.1016/j.carbpol.2013.04.027] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2013] [Revised: 04/01/2013] [Accepted: 04/10/2013] [Indexed: 10/26/2022]
Abstract
The conformation and heterogeneity of lambda-carrageenan, a sulphonated galactan from red seaweed, solubilised in aqueous solvent with the assistance of microwave irradiation, has been assessed by a combination of analytical ultracentrifugation, size-exclusion chromatography, light scattering and capillary viscometry. Preparations appeared generally unimodal on the basis of sedimentation coefficient distributions from sedimentation velocity although at the highest concentrations a shoulder appears with a sedimentation coefficient approximately 1.1 times greater than that of the main component. Even under conditions commensurate with charge suppression simple linear regression was insufficient to represent non-ideal concentration dependence and the extraction of the Grálen concentration dependence parameter ks. A more general fitting algorithm was therefore employed. Mark-Houwink-Kuhn-Sakurada analysis of the change in intrinsic viscosity [η] with molecular weight, together with the Wales-van Holde ratio (combination of ks with [η]) point to an extended flexible conformation for lambda-carrageenan in the (weight average) molecular weight range Mw=340,000-870,000g/mol. The origin of the larger sedimentation coefficient component appearing at the higher concentrations is considered.
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Affiliation(s)
- Fahad M Almutairi
- National Centre for Macromolecular Hydrodynamics, University of Nottingham, Sutton Bonington LE12 5RD, UK
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145
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Miníková S, Sroková I, Sasinková V, Malovíková A, Ebringerová A. O-(2-Hydroxyethyl)cellulose–derived Surfactants Prepared by Microwave–assisted Transesterification. TENSIDE SURFACT DET 2013. [DOI: 10.3139/113.110020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Abstract
A series of polymeric surfactants were prepared from O-(2-hydroxyethyl)cellulose (HEC, DS = 1) by transesterification of methyl laurate and the complex of methyl esters of rape seed oil fatty acids in the H2O/DMF system using microwave irradiation as heating source. The obtained derivatives were characterized by FTIR spectroscopy and viscometry, and their surfaceactive, foaming, emulsification and performance properties evaluated. The results indicate that under microwave heating water-soluble HEC-fatty acid esters with very low degree of esterification can be obtained in a few minutes and at temperatures not exceeding 100°C. The derivatives exhibited foaming ability and significant emulsifying efficiency for ‘oil in water’-type emulsions comparable to that of commercial surfactants as well as a good washing power and very high antiredeposition efficiency.
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Affiliation(s)
- S. Miníková
- Trenčín University of Alexander Dubcek, Púchov, Slovakia
| | - I. Sroková
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Bratislava, Slovakia
| | - V. Sasinková
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Bratislava, Slovakia
| | - A. Malovíková
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Bratislava, Slovakia
| | - A. Ebringerová
- Institute of Chemistry, Center for Glycomics, Slovak Academy of Sciences, Bratislava, Slovakia
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146
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García de la Torre J, Harding SE. Hydrodynamic modelling of protein conformation in solution: ELLIPS and HYDRO. Biophys Rev 2013; 5:195-206. [PMID: 23646070 PMCID: PMC3641304 DOI: 10.1007/s12551-013-0102-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 01/22/2013] [Indexed: 11/21/2022] Open
Abstract
The last three decades has seen some important advances in our ability to represent the conformation of proteins in solution on the basis of hydrodynamic measurements. Advances in theoretical modeling capabilities have been matched by commensurate advances in the precision of hydrodynamic measurements. We consider the advances in whole-body (simple ellipsoid-based) modeling—still useful for providing an overall idea of molecular shape, particularly for those systems where only a limited amount of data is available—and outline the ELLIPS suite of algorithms which facilitates the use of this approach. We then focus on bead modeling strategies, particularly the surface or shell–bead approaches and the HYDRO suite of algorithms. We demonstrate how these are providing great insights into complex issues such as the conformation of immunoglobulins and other multi-domain complexes.
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Affiliation(s)
- José García de la Torre
- Departamento de Quimica Fisica, Universidad de Murcia, Regional Campus Mare Nostrum, 30071 Murcia, Spain
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147
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Chaudhri A, Zarraga IE, Yadav S, Patapoff TW, Shire SJ, Voth GA. The Role of Amino Acid Sequence in the Self-Association of Therapeutic Monoclonal Antibodies: Insights from Coarse-Grained Modeling. J Phys Chem B 2013; 117:1269-79. [DOI: 10.1021/jp3108396] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Anuj Chaudhri
- Department of Chemistry, James
Franck Institute, Institute for Biophysical Dynamics and Computation
Institute, University of Chicago, Chicago
Illinois 60637, United States
| | - Isidro E. Zarraga
- Late Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, S. San Francisco, California
94080, United States
| | - Sandeep Yadav
- Late Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, S. San Francisco, California
94080, United States
| | - Thomas W. Patapoff
- Early
Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, S. San Francisco, California
94080, United States
| | - Steven J. Shire
- Late Stage Pharmaceutical Development, Genentech Inc., 1 DNA Way, S. San Francisco, California
94080, United States
| | - Gregory A. Voth
- Department of Chemistry, James
Franck Institute, Institute for Biophysical Dynamics and Computation
Institute, University of Chicago, Chicago
Illinois 60637, United States
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148
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149
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Grupi A, Minton AP. Capillary viscometer for fully automated measurement of the concentration and shear dependence of the viscosity of macromolecular solutions. Anal Chem 2012; 84:10732-6. [PMID: 23130673 DOI: 10.1021/ac302599j] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The construction and operation of a novel viscometer/rheometer are described. The instrument is designed to measure the viscosity of a macromolecular solution while automatically varying both solute concentration and shear rate. Viscosity is calculated directly from Poiseuille's law, given the measured difference in pressure between two ends of a capillary tube through which the solution is flowing at a known rate. The instrument requires as little as 0.75 mL of a solution to provide a full profile of viscosity as a function of concentration and shear rate, and it can measure viscosities as high as 500 cP and as low as 1 cP, at shear rates between 10 and 2 × 10(3) s(-1). The results of control experiments are presented to document the accuracy and precision of measurement at both low and high concentration of synthetic polymers and proteins.
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Affiliation(s)
- Asaf Grupi
- Section on Physical Biochemistry, Laboratory of Biochemistry and Genetics, National Institute of Diabetes and Digestive and Kidney Diseases, National Institutes of Health, U.S. Department of Health and Human Services, Bethesda, Maryland 20892-0830, USA.
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150
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Filippov SK, Sedlacek O, Bogomolova A, Vetrik M, Jirak D, Kovar J, Kucka J, Bals S, Turner S, Stepanek P, Hruby M. Glycogen as a Biodegradable Construction Nanomaterial for in vivo Use. Macromol Biosci 2012; 12:1731-8. [DOI: 10.1002/mabi.201200294] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2012] [Revised: 08/28/2012] [Indexed: 01/08/2023]
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