Major water-soluble polyphenols, proanthocyanidins, in leaves of persimmon (Diospyros kaki) and their α-amylase inhibitory activity
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- KAWAKAMI Kayoko
- Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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- AKETA Saiko
- Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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- NAKANAMI Mitsuhiro
- Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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- IIZUKA Shinzo
- Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
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- HIRAYAMA Masao
- Department of Food Science, Niigata University of Pharmacy and Applied Life Sciences
書誌事項
- タイトル別名
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- Major Water-Soluble Polyphenols, Proanthocyanidins, in Leaves of Persimmon (Diospyros kaki) and Their .ALPHA.-Amylase Inhibitory Activity
- Major water soluble polyphenols proanthocyanidins in leaves of persimmon Diospyros kaki and their a amylase inhibitory activity
- Major Water-Soluble Polyphenols, Proanthocyanidins, in Leaves of Persimmon (<i>Diospyros kaki</i>) and Their α-Amylase Inhibitory Activity
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The amounts and compositions of polyphenol in persimmon leaves and persimmon leaf tea were investigated. The predominant polyphenols in fresh leaves were water-soluble, and the contents reached a maximum (2.40% w/w) in June, and then gradually decreased. Separation of them followed by thiolytic degradation revealed that the major components were unique proanthocyanidin oligomers consisting of four heterogeneous extension units, including epigallocatechin-3-O-gallate. Persimmon leaf tea also contained similar proanthocyanidins with similar compositional units. Oral administration of starch with polyphenol concentrate of persimmon leaf tea resulted in a significant and dose-dependent decrease in the blood glucose level in Wistar rats. This effect is considered to be due to inhibition of pancreas α-amylase. These results indicate that persimmon leaf tea containing peculiar proanthocyanidins has a significant role in suppressing blood glucose elevation after starch intake, and that the best harvest time is June.
収録刊行物
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- Ｂｉｏｓｃｉｅｎｃｅ， Ｂｉｏｔｅｃｈｎｏｌｏｇｙ， ａｎｄ Ｂｉｏｃｈｅｍｉｓｔｒｙ
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Ｂｉｏｓｃｉｅｎｃｅ， Ｂｉｏｔｅｃｈｎｏｌｏｇｙ， ａｎｄ Ｂｉｏｃｈｅｍｉｓｔｒｙ 74 (7), 1380-1385, 2010
公益社団法人 日本農芸化学会
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詳細情報 詳細情報について
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- CRID
- 1390282681456080384
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- NII論文ID
- 10027557101
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- NII書誌ID
- AA10824164
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- ISSN
- 13476947
- 09168451
- http://id.crossref.org/issn/00032697
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- NDL書誌ID
- 10766486
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- 本文言語コード
- en
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- データソース種別
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- 抄録ライセンスフラグ
- 使用不可