Document Detail

Purification and Characterization of Polyphenols from Chestnut Astringent Skin.
MedLine Citation:
PMID:  21777007     Owner:  NLM     Status:  Publisher    
Polyphenolic compounds from chestnut astringent skin (CAS) were purified by dialysis, using Diaion HP-20 and Sephadex LH-20 columns. During purification, specific α-amylase inhibitory activities were increased about 3.4-fold and the 50% inhibition value was 5.71 μg/mL in the Sephadex LH-20 fraction (SE-fraction). The SE-fraction contained about 67 % of the total polyphenols, 57.3% of the flavanol-type tannins and 51.3 % of the procyanidins. Strong antioxidant activity was observed in the SE-fraction. Oral administration of the SE-fraction in rats fed corn starch significantly suppressed an increase in blood glucose levels. The SE-fraction contained gallic acid and ellagic acid. The MALDI-TOF spectrum showed a peak series exhibiting a mass increment of 288 Da, reflecting the variation in the number of catechin/epicatechin units. Our results suggest CAS contains polyphenols with strong α-amylase inhibitory activity. The data also suggests CAS polyphenols might be oligomeric proanthocyanidins with gallic acid and ellagic acid.
Tsujita Takahiro; Misato Yamada; Takeshi Takaku; Tomoyashi Shintani; Kanae Teramoto; Takafumi Sato
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2011-7-21
Journal Detail:
Title:  Journal of agricultural and food chemistry     Volume:  -     ISSN:  1520-5118     ISO Abbreviation:  -     Publication Date:  2011 Jul 
Date Detail:
Created Date:  2011-7-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0374755     Medline TA:  J Agric Food Chem     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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