A comparison of Pycnogenol(R) and bark extracts from Pinus thunbergii and Pinus densiflora: Extractability, antioxidant activity and proanthocyanidin composition
- A comparison of Pycnogenol(R) and bark extracts from Pinus thunbergii and Pinus densiflora: Extractability, antioxidant activity and proanthocyanidin composition
- 김상민; 강석우; 전제승; 엄병헌
- antioxidant activity; pine bark; Pinus densiflora; Pinus thunbergii; proanthocyanidin; Pycnogenol？
- Issue Date
- Journal of Medicinal Plants Research
- VOL 6, NO 14, 2839-2849
- 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？.
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