A Tissue Homogenate Method To Prepare Gram-Scale Allium Thiosulfinates and Their Disulfide Conjugates with Cysteine and Glutathione
摘要:
The health benefits of Allium vegetables are widely attributed to the enzyme-derived organosulfur compounds called thiosulfinates (TS). However, the lack of a suitable method to prepare TS in good yields has hampered the evaluation of their biological activities. This paper describe a simple enzymatic method using Allium tissue homogenates as a reaction system to prepare gram-scale TS, including those enriched in 1-propenyl groups, which are particularly difficult to obtain. This method is simple, easy to scale up, and requires no column purification step, making it suitable for practical large-scale production of Allium TS. The prepared TS were further utilized to prepare the disulfide conjugates with cysteine and glutathione (CySSR and GSSR, R = methyl, ethyl, propyl, 1-propenyl, and allyl), which are the presumptive metabolites of TS. Among all of the Allium CySSR and GSSR conjugates, the newly prepared glutathione conjugate with 1-propenyl TS, GSSPe, showed the most potent effect to induce quinone reductase (QR, a representative phase II enzyme) in murine hepatoma cells (Hepa 1c1c7) and inhibit nitric oxide (NO) production in lipopolysaccharide (LPS)-stimulated macrophage cells (RAW 264.7).
Oxidation reaction of amino acids in aqueous solution induced by argon arc plasma
作者:Kaoru Harada、Michiaki Takasaki
DOI:10.1016/s0040-4039(00)94021-8
日期:1983.1
It was found that Argon arc plasma induced a powerful and clean stepwise oxidation reaction in aqueoussolution containing various amino acids without using any oxidizing agent.