Polyphenols and Other Components in the Fractions Prepared from the Infusions of Various Tea Leaves
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概要
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The amounts of polyphenols, ascorbic acid, caffeine and sugars in the fractions of green, oolong, black, and Pu-erh tea infusions were determined. Their reducing and Fe^<2+>-chelating activities were also measured. The tea infusions were fractionated by extracting with chloroform, ethyl acetate, and n-butanol in this order and followed by the dialysis of residual aqueous layer. Caffeine was found in chloroform fractions of all kinds of tea infusions, while high amounts of catechins were found in ethyl acetate fractions of green and oolong tea infusions. n-Butanol fraction of black tea infusion contained polyphenols consisting of flavanols, theaflavins, and gallic acid. Aqueous dialysate fractions of green and oolong tea infusions were composed of high amounts of phenolics and sugars. Ascorbic acid was observed in this fraction of only green tea infusion, while, high amount of associated tannins was observed in this fraction of black tea infusion. Non-dialysate fraction of Pu-erh tea infusion contained small amounts of phenolics and sugars. Significantly positive correlations were observed between the contents of reducing compounds and catechins and also between those of Fe^<2+>-chelating compounds and total phenolics in each fraction of tea infusion. It was suggested that there would be other polyphenolic antioxidants besides catechins in green, oolong, and black tea infusions.
- 沼津工業高等専門学校の論文
- 1997-01-31
著者
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NAKAMURA Yoshiyuki
School of Pharmaceutical Sciences, University of Shizuoka
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TOMITA Isao
School of Pharmaceutical Sciences, University of Shizuoka
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Tomita Isao
Graduate School Of Health Sciences University Of Shizuoka
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Tomita I
School Of Pharmaceutical Sciences University Of Shizuoka
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Tomita Isao
School Of Pharmaceutical Sciences University Of Shizuoka
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YOSHINO Kyoji
Department of Chemistry and Biochemistry, Numazu College of Technology
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TAMURA Mayuko
Department of Chemistry and Biochemistry, Numazu College of Technology
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SANO Mitsuaki
School of Pharmaceutical Sciences, University of Shizuoka
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YOSHINO Kyoji
Numazu College of Technology, Department of Chemistry and Biochemistry
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TAMURA Mayuko
Numazu College of Technology, Department of Chemistry and Biochemistry
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WAKABAYASHI Tetsuya
Numazu College of Technology, Department of Chemistry and Biochemistry
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Tomita I
Graduate School Of Health Sciences University Of Shizuoka
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Sano M
National Institute Of Vegetable And Tea Science National Agriculture And Bio-oriented Research Organ
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Tamura Mayuko
Department Of Chemistry And Biochemistry Numazu College Of Technology
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Sano Mitsuaki
Dep. Of Food Sci. And Nutrition Nagoya Women's Univ.
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Sano Mitsuaki
School Of Pharmaceutical Sciences University Of Shizuoka
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Yoshino K
Department Of Chemistry And Biochemistry Numazu College Of Technology
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Yoshino Kyoji
Numazu College Of Technology Department Of Chemistry And Biochemistry
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Wakabayashi Tetsuya
Numazu College Of Technology Department Of Chemistry And Biochemistry
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Nakamura Y
National Inst. Crop Sci. Ibaraki Jpn
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SANO Mitsuaki
School of Pharmaceutical Science, University of Shizuoka
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