دورية أكاديمية
Physicochemical features of ultra-high viscosity alginates.
| العنوان: | Physicochemical features of ultra-high viscosity alginates. |
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| المؤلفون: | Storz H; Institute for Technical and Macromolecular Chemistry, University of Hamburg, Hamburg, Germany., Müller KJ, Ehrhart F, Gómez I, Shirley SG, Gessner P, Zimmermann G, Weyand E, Sukhorukov VL, Forst T, Weber MM, Zimmermann H, Kulicke WM, Zimmermann U |
| المصدر: | Carbohydrate research [Carbohydr Res] 2009 May 26; Vol. 344 (8), pp. 985-95. Date of Electronic Publication: 2009 Feb 25. |
| نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
| اللغة: | English |
| بيانات الدورية: | Publisher: Elsevier Country of Publication: Netherlands NLM ID: 0043535 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1873-426X (Electronic) Linking ISSN: 00086215 NLM ISO Abbreviation: Carbohydr Res Subsets: MEDLINE |
| أسماء مطبوعة: | Publication: Amsterdam : Elsevier Original Publication: Amsterdam. |
| مواضيع طبية MeSH: | Viscosity*, Alginates/*chemistry, Alginates/isolation & purification ; Magnetic Resonance Spectroscopy ; Molecular Structure ; Phaeophyceae/chemistry ; Scattering, Radiation |
| مستخلص: | The physicochemical characteristics of the ultra-high viscosity and highly biocompatible alginates extracted from Lessonia nigrescens (UHV(N)) and Lessonia trabeculata (UHV(T)) were analyzed. Fluorescence and (1)H NMR spectroscopies, viscometry, and multi-angle light scattering (MALS) were used for elucidation of the chemical structure, molar mass, and coil size. The sequential structures from NMR spectroscopy showed high guluronate content for UHV(T), but low for UHV(N). Intrinsic viscosity [eta] measurements exhibited unusual high values (up to 2750 mL/g), whereas [eta] of a commercial alginate was only about 970 mL/g. MALS batch measurements of the UHV-alginates yielded ultra-high values of the weight average molar mass (M(w) up to 1.1x10(6) g/mol) and of the z-average gyration radius (R(G)(z) up to 191 nm). The M(w) and R(G)(z) distributions of UHV-alginates and of ultrasonically degraded fractions were determined using size exclusion chromatography combined with MALS and asymmetrical flow-field-flow fractionation. The M(w) dependency of [eta] and R(G)(z) could be described by [eta]=0.059xM(w)(0.78) and R(G)(z)=0.103xM(w)(x). (UHV(N): x=0.52; UHV(T): x=0.53) indicating that the monomer composition has no effect on coil expansion. Therefore, the equations can be used to calculate M(w) and R(G)(z) values of UHV(T)- and UHV(N)-alginate mixtures as used in immunoisolation. Furthermore, the simple and inexpensive capillary viscometry can be used for real-time validation of the extraction and purification process of the UHV-alginates. |
| المشرفين على المادة: | 0 (Alginates) |
| تواريخ الأحداث: | Date Created: 20090428 Date Completed: 20090723 Latest Revision: 20240109 |
| رمز التحديث: | 20240109 |
| DOI: | 10.1016/j.carres.2009.02.016 |
| PMID: | 19394590 |
| قاعدة البيانات: | MEDLINE |
Full Text Finder | تدمد: | 1873-426X |
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| DOI: | 10.1016/j.carres.2009.02.016 |