Non-covalent interaction between procyanidins and apple cell wall material. Part II: Quantification and impact of cell wall drying
| Autor: | Catherine M.G.C. Renard, C. Le Bourvellec |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Flavonoids
chemistry.chemical_classification Langmuir Chromatography Temperature Biophysics Polyphenols Hydrogen Bonding Biochemistry Cell wall Adsorption Phenols chemistry Polymerization Proanthocyanidin Cell Wall Malus Microscopy Electron Scanning Tannin Proanthocyanidins Composition (visual arts) Desiccation Saturation (chemistry) Molecular Biology |
| Zdroj: | Biochimica et Biophysica Acta (BBA) - General Subjects. 1725:1-9 |
| ISSN: | 0304-4165 |
| DOI: | 10.1016/j.bbagen.2005.06.003 |
| Popis: | The adsorption of condensed tannins (procyanidins) on solid cell wall material was quantified using the Langmuir isotherms formulation. Six tannins fractions differing by their size (number average degree of polymerisation between 2.5 and 65) and composition (presence of galloyl groups from to 0 to 22%, proportions of (+)-catechin to (−)-epicatechin from traces to one CAT for three EPI) were used. Two cell walls differing only by their physical characteristics were obtained by mild or harsh drying, with surface areas of 2.15 and 0.52 m 2 /g, respectively. The total amounts of procyanidins retained on the cell wall materials increased with their concentrations while the proportions of retained decreased, and a plateau was reached at high concentrations. The apparent affinity of procyanidins for CWM isolated from apples increased with their molecular weight. Decrease of the CWM porosity by harsh drying slightly decreased the apparent affinity and increased the apparent saturation levels when constants were expressed relative to cell wall weight, but strongly increased both apparent affinity and apparent saturation levels per surface units. |
| Databáze: | OpenAIRE |
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