Analysis of A-Type and B-Type Highly Polymeric Proanthocyanidins and Their Biological Activities as Nutraceuticals

Table 2

Proportions of terminal units in highly polymeric proanthocyanidins from seed shells of Japanese horse chestnut, blueberry, and cranberry as determined by UPLC-ESI/MS of the thiolytic products.

	Cleaved terminal unit	Proportion (mol%)
		AF2	AF3	BF2	BF3	CF2	CF3
1	(+)-Catechin	10.2	8.9	51.8	35.8	7.8	7.8
2	(−)-Epicatechin	70.7	74.6	48.2	64.2	56.7	52.2
3	Procyanidin A2	19.1	16.5	N.D.	N.D.	35.5	40.0

The terminal units were quantified by monitoring the absorbance at 280 nm. Data represent the mean of three independent experiments. N.D.: not detectable.