Abstract
Grape seed extract (GSE) has become popular in recent years as a nutritional supplement that possesses antioxidant activity. These extracts contain a heterogeneous mixture of monomers, oligomers, and polymers composed of proanthocyanidin (or flavan-3-ol) subunits. The common colorimetric methods for analyzing the procyanidin concentration and/or composition of grape seed extracts and products containing it can give only crude information on the distribution of the sizes of the components. A normal phase HPLC method has proven to be very applicable to analyzing grape seed extract material and products thereof, and monomer, oligomer (2-7 subunits) and polymeric (8-24 subunits, and ∼24+ subunits) fractions can be discriminated. Values ranged from 5% to 30% for monomers, 17% to 63% oliogomers, 11% to 39% polymers and 2% to 50% for the large (24+) polymers. When specific attributes can be defined for particular size fractions, this method can provide the information needed to compare different samples for their relative potential effect.
- Copyright 2000 by the American Society for Enology and Viticulture
Sign in for ASEV members
ASEV Members, please sign in at ASEV to access the journal online.
Sign in for Institutional and Non-member Subscribers
Log in using your username and password
Pay Per Article - You may access this article (from the computer you are currently using) for 2 day for US$10.00
Regain Access - You can regain access to a recent Pay per Article purchase if your access period has not yet expired.
Vol 51 Issue 4
