著者

大前 雅彦 勝井 五一郎

出版者

公益社団法人 日本ビタミン学会

雑誌

ビタミン (ISSN:0006386X)

巻号頁・発行日

vol.39, no.3, pp.181-189, 1969

---

The products of the photolysis of vitamin K_1 in benzene solution were subjected to thin layer chromatograpy using silica gel and chloroform as solvent to give colored spots with Rf of 0 (spot 4), 0.21 (spot 5) and colorless spot with Rf of 0.56 (spot 6) along with other spots. Spot 5 and 6 were elucidated as 5-hydroxy-4-methyl-6,7-benzocoumaran-3-one and phytone, and spot 4 was revealed to be polymer which had the same structure as spot 5.

著者

勝井 五一郎 大前 雅彦

出版者

公益社団法人 日本ビタミン学会

雑誌

ビタミン (ISSN:0006386X)

巻号頁・発行日

vol.34, no.1, 1966

著者

阿部 皓一 石橋 恭子 大前 雅彦 河部 靖 勝井 五一郎

出版者

日本ビタミン学会

雑誌

ビタミン (ISSN:0006386X)

巻号頁・発行日

vol.51, no.3, pp.111-117, 1977-03-25

被引用文献数

2

---

A Method for the determination of ubiquinone homologues (UQ) in serum and liver is described. Serum or liver homogenate was saponified with methanolic alkaline solution after addition of 2,3,6-trimethyl-5-nonaprenyl-1,4-benzoquinone (TQ-9) as an internal standard and then extracted with n-hexane. The n-hexane extract was evaporated under N_2 gas at 30℃, and the residue was dissolved in dioxane. The sample solution was applied to the high-speed liquid chromatography (HSLC) using a Permaphase ODS column and ethanol・water (80 : 20) as a mobile phase. The peaks of UQ and TQ-9 were not disturbed by other fat-soluble substances when an on-line high-sensitive multiple wavelength detector set at 275 nm (absorption maximum of UQ) was used as a detector. The proposed HSLC method was found to be more simple and specific than the other conventional determination methods.

著者

勝井 五一郎

出版者

日本ビタミン学会

雑誌

ビタミン (ISSN:0006386X)

巻号頁・発行日

vol.51, no.4, 1977-04-25

著者

勝井 五一郎 久山 宏

出版者

公益社団法人 日本ビタミン学会

雑誌

ビタミン (ISSN:0006386X)

巻号頁・発行日

vol.8, pp.297-299, 1955

---

The relation between the chemical structure and the antioxidant effect of phenolic antioxidants was studies. The results on the whole were consistent with those reported by previous investigators. But as for polynuclear phenolic antioxidants, We have found an interesting result on the influence of the nucleus and the side-chain on the antioxidant effect.