Abstract
A micro-method using thiolysis followed by HPLC monitoring of the degradation products was developed to determine the structure of procyanidin oligomers available in small quantities (≤ 0.1 mg). It was successfully applied to a series of procyanidins isolated from grape seeds, allowing the identification of procyanidins dimers B5 to B8 linked by C4 → C6 bonds, six procyanidin trimers with C4 → C8 and C4 → C6 linkages, and six galloylated dimers and trimers, along with the four C4 → C8 linked dimers, Bl to B4. The influence of procyanidin structural variations on their interactions with proteins, free radical scavenging effect, and oxidation was studied using these compounds. Protein-procyanidin interactions increased with the degree of polymerization, the number of galloyl substituents, and the extent of C4→ C6 linkages. Galloylation increased scavenger capacity of procyanidin dimers for Superoxide anion (O2 -•) and hydroxyl (su•OH) radicals. The type of C → C linkage and the esterification position were also important. None of the molecules tested was oxidizable by grape polyphenoloxidase, but they were all oxi-dized by the enzymically generated caffeoyl tartaric acid o-quinones. In addition, galloylated procyanidins seemed to undergo condensation reactions faster than the corresponding non-galloylated ones, even though their rate of oxidation was similar.
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Cheynier, V., Rigaud, J., da Silva, J.M.R. (1992). Structure of Procyanidin Oligomers Isolated From Grape Seeds in Relation to Some of their Chemical Properties. In: Hemingway, R.W., Laks, P.E. (eds) Plant Polyphenols. Basic Life Sciences, vol 59. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3476-1_16
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