著者

Tsutomu Nakayama Hideharu Huriya Asuka Kamo Kenzi Kosako Takeyuki Kozima Maki Sugawara Taiki Suzuki Mie Nishizima Ai Yamashita Megumi Yano Shouhei Makino Kota Kera Masumi Iijima

出版者

Japanese Society for Food Science and Technology

雑誌

Food Science and Technology Research (ISSN:13446606)

巻号頁・発行日

pp.FSTR-D-22-00202, (Released:2023-01-20)

被引用文献数

2

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The molecular interaction of black tea components with phospholipid vesicles has been investigated to elucidate the various functions of black tea infusions, such as astringency, inhibition of cholesterol absorption, and inactivation of viruses. We have developed a simple method to analyze the turbidity of phospholipid vesicle solutions reacted with black tea infusions or components as an indicator of the molecular interaction. Using a portable visible spectrophotometer, the dose-dependency of catechins, theaflavins, thearubigins, and black tea infusions on turbidity was analyzed. The results indicate that authentic catechins and theaflavins independently caused aggregation of the phospholipid vesicles; however, their concentrations in the tea infusions were insufficient. Meanwhile, thearubigins prepared from black tea leaves caused aggregation at the concentration found in the tea infusions. It is concluded that thearubigins, instead of theaflavins, mainly contribute to the interaction with phospholipid vesicles.

著者

Masaaki Akamatsu Taiki Suzuki Kazuki Kobayashi Koji Tsuchiya Kenichi Sakai Hideki Sakai

出版者

Japan Oil Chemists' Society

雑誌

Journal of Oleo Science (ISSN:13458957)

巻号頁・発行日

vol.68, no.7, pp.659-664, 2019 (Released:2019-07-01)

参考文献数

21

被引用文献数

3 4

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This report focuses on acceleration of the recombination of lophyl radicals with a lophine dimer derivative by forming molecular assemblies. A newly synthesized cationic amphiphilic lophine dimer formed molecular assemblies with a diameter of ~220 nm in an aqueous medium. When the molecular assemblies were formed, the rate of recombination of lophyl radicals, produced by ultraviolet light irradiation, was accelerated 50,000-fold compared to that in an organic solvent. The rate enhancement is likely derived from the short diffusion distance of the lophyl radicals in the molecular assemblies. These results revealed that accumulation of the lophine dimers via self-assembly remarkably accelerated the recombination of lophyl radicals. This novel photoisomerization system could rapidly control the interfacial properties or morphologies of molecular assemblies when used for applications, such as efficient delivery of drugs or active components.