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Micro method for the identification of proanthocyanidin using thiolysis monitored by high-performance liquid chromatography

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Abstract

The classical method of procyanidin thiolysis was modified so as to render it suitable for the identification of small amount (<0.1 mg) of compound. High-performance liquid chromatographic monitoring of the degradation kinetics gives acces to the intermediate products. The use of sulphur dioxide instead of acetic acid as the hydrolysing agent allows a faster reaction, thus minimizing structural modifications, and prevents alterations due to procyanidin oxidation.

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  • New insight into the unresolved HPLC broad peak of Cabernet Sauvignon grape seed polymeric tannins by combining CPC and Q-ToF approaches

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    Citation Excerpt :

    A number of strategies have been applied to investigate tannin polymers. Depolymerization of polymerized tannins is one of the most popular approaches, which involves both thiolysis methodology (Rigaud, Perez-Ilzarbe, Da Silva, & Cheynier, 1991) and phloroglucinolysis methodology (Kennedy & Taylor, 2003). Based on the mechanism of acid-catalyzed cleavage of interflavan linkages, it provides information on the mean degree of polymerization and constitutive flavanol units.

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1

Present address: Instituto de Fermentaciones Industriales, Juan de la Cierva 3, 28006 - Madrid, Spain.

2

On leave from the Universidade Técnica de Lisboa, Instituto Superior de Agronomia, Laboratorio “Ferreira Lapa”, 1399 Lisboa codex, Portugal.

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