A comparison of Pycnogenol(R) and bark extracts from Pinus thunbergii and Pinus densiflora: Extractability, antioxidant activity and proanthocyanidin composition

Title
A comparison of Pycnogenol(R) and bark extracts from Pinus thunbergii and Pinus densiflora: Extractability, antioxidant activity and proanthocyanidin composition
Authors
김상민강석우전제승엄병헌
Keywords
antioxidant activity; pine bark; Pinus densiflora; Pinus thunbergii; proanthocyanidin; Pycnogenol?
Issue Date
2012-04
Publisher
Journal of Medicinal Plants Research
Citation
VOL 6, NO 14, 2839-2849
Abstract
Hot water extracts (HWEs) from Pinus densiflora and Pinus thunbergii, two major Pinus species in Korea, and Pycnogenol? (PYC), a standardized Pinus pinaster bark extract, were fractionated to yield ethyl acetate (EAF) and proanthocyanidin (PAF) fractions for determination of total phenolic (TP) and proanthocyanidin (PA) content, and antioxidant activity. The TP and PA contents, the PA/TP ratio, and the antioxidant activity from the HWE, EAF and PAF were all in the order of P. densiflora > P. pinaster > P. thunbergii. The mean degree of polymerization (mDP) by acid catalysis in the presence of excess phloroglucinol were similar in all three pine bark EAFs (3.51 to 3.69), but were quite variable in the other fractions (in PAFs, 5.56 (P. thunbergii) to 7.49 (P. densiflora); in HWEs, 4.85 (P. densiflora) to 6.14 (P. pinaster)). However, the PA structures determined by 13C NMR analysis with PAFs were similar for all three Pinus species with respect to the ratio of procyanidin and prodelphinidin and C2-C3 stereochemistry. From the aforementioned results, we could suggest that the bark from P. densiflora had more beneficial characteristics than the well-known Pycnogenol?.
URI
http://pubs.kist.re.kr/handle/201004/42303
ISSN
19960875
Appears in Collections:
KIST Publication > Article
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