Changes in Epigallocatechin-3-O-(3-O-methyl) Gallate and Strictinin Contents of Tea (Camellia sinensis L.) Cultivar ‘Benifuki’ in Various Degrees of Maturity and Leaf Order
Mari Maeda-Yamamoto,Hiroshi Nagai,Kazumi Asai,Sawako Moriwaki,Hideki Horie,Katsunori Kohata,Hirofumi Tachibana,Toshio Miyase,Mitsuaki Sano +8 more
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TL;DR: To obtain the anti-allergic benefits of EGCG3″Me, green tea should be made from fully-matured ‘Benifuki’ leaves under the fourth shoot late in the first crop or under the third shoot in the second crop, refined by removing stems.
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Abstract: We have reported that O-methylated EGCGs (epigallocatechin-3-O-(3-O-methyl) gallate (EGCG3″Me) and epigallocatechin-3-O-(4-O-methyl) gallate) and strictinin had anti-allergic action, and that the tea (Camellia sinensis L.) cultivar ‘Benifuki’ was rich in EGCG3″Me. However, changes in the content of anti-allergic components in tea leaves during growth are unclear. Therefore, here we determined the contents of EGCG3″Me and strictinin at various points of maturity and in the leaf order of ‘Benifuki’ tea in the first and second crop seasons. The EGCG3″Me content was high and caffeine content decreased in fully-matured tea leaves late in the first crop season or under the third leaf during the second crop season. The amount of EGCG3″Me contained in the stem was low. A higher concentration of strictinin was found in younger new shoots in the first crop, and the content greatly decreased during the second crop season. Thus, to obtain the anti-allergic benefits of EGCG3″Me, green tea should be made from fully-matured ‘Benifuki’ leaves under the fourth shoot late in the first crop or under the third shoot in the second crop, refined by removing stems. This green tea is lower in caffeine as compared with that made from younger shoots. On the contrary, to utilize strictinin, green tea should be made using younger new shoots of ‘Benifuki.’
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Citations
Antihypertensive effect of Benifuuki tea containing O-methylated EGCG.
TL;DR: The effect of Benifuuki tea on human hypertension is mainly the result of the strong inhibitory effect of EGCG3''Me on ACE activity, its high rate of absorption, and its stability in the blood.
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Effect of shading intensity on morphological and color traits and on chemical components of new tea (Camellia sinensis L.) shoots under direct covering cultivation.
TL;DR: The morphological traits, color traits, and chemical components of new tea shoots and leaves varied depending on radiation intensity, shoot growth, and cropping season.
96
Analysis of acrylamide in green tea by gas chromatography-mass spectrometry.
Yuzo Mizukami,Katsunori Kohata,Yuichi Yamaguchi,Nobuyuki Hayashi,Yusuke Sawai,Yoshihiro Chuda,Hiroshi Ono,Hiroshi Yada,Mitsuru Yoshida +8 more
TL;DR: An analysis of 82 tea samples showed that rather than the reducing sugar content, the asparagine content in tea leaves was a significant factor related to acrylamide formation in roasted products.
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Epicatechin-3-O-(3″-O-methyl)-gallate content in various tea cultivars (Camellia sinensis L.) and its in vitro inhibitory effect on histamine release.
TL;DR: Investigation of the effect of various tea leaf catechins on histamine release from murine bone marrow mast cells suggests that ECG3″Me might link to the antiallergic effect of 'Benifuuki' tea, as has been reported for EGCG3′Me.
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Metabolic phenotyping of various tea (Camellia sinensis L.) cultivars and understanding of their intrinsic metabolism.
Hyang-Gi Ji,Lee Yeongran,Min-Seuk Lee,Kyeong Hwan Hwang,Eun-Hee Kim,Jun Seong Park,Young-Shick Hong +6 more
TL;DR: The current study highlights the distinct metabolism of various tea cultivars newly selected for cultivation and the important role of metabolomics in understanding the metabolic mechanism.
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