翻訳と辞書 Words near each other ・ Methil Devika ・ Methil Docks ・ Methil Offshore Wind Farm ・ Methil Pilots ・ Methil power station ・ Methimazole ・ Methimepip ・ Methine group ・ Methinkot ・ Methiocarb ・ Methiodal ・ Methiodide ・ Methioeme ・ Methioides ・ Methion ・ Methional ・ Methionine ・ Methionine (data page) ・ Methionine decarboxylase ・ Methionine gamma-lyase ・ Methionine racemase ・ Methionine S-methyltransferase ・ Methionine sulfoxide ・ Methionine sulfoxide reductase ・ Methionine synthase ・ Methionine transaminase ・ Methionine-S-oxide reductase ・ Methionine—glyoxylate transaminase ・ Methionine—tRNA ligase ・ Methionopsis Dictionary Lists mini英和辞書 mini和英辞書 Webster 1913 Latin-English FOLDOC Wikipedia English ウィキペディア

翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Methional ： ウィキペディア英語版 Methional Methional is an organic compound with the formula CH3SCH2CH2CHO. It is a colorless liquid that is a degradation product of methionine. It is a notable flavor in potato-based snacks, namely potato chips, one of the most popular foods containing methional.〔Faith C. Belanger, Rong Di & Daphna Havkin-Frenkel (2009) Increasing the Methional Content in Potato through Biotechnology, Biotechnology in Flavor Production, 185-188, 〕 Traces of the compound can also be found in black tea and green tea based products. Methional contains both aldehyde and thioether functional groups. It is readily soluble in alcohol solvents, including propylene glycol and dipropylene glycol. == Occurrence == In nature, methional is a thermally-induced volatile flavor compound. For instance, the heat-initiated Maillard reaction of reducing sugars and amino acids forms the initial basis of methional's composition. The formation of methional stems from the interaction of α-dicarbonyl compounds (intermediate products in the Maillard reaction) with methionine (Met) by the Strecker degradation reaction:〔 :CH3SCH2CH2(NH2)CHCO2H + O → CH3SCH2CH2(HN=)CCO2H + H2O :CH3SCH2CH2(HN=)CCO2H + H2O → CH3SCH2CH2CHO + NH3 + CO2 Methional easily degrades into methanethiol, which then oxidizes into dimethyl disulfide. Dimethyl disulfide is partly responsible for the "reactive sulfur" that causes the overall taste of potatoes. Furthermore, the methionine resulting from the Strecker degradation reaction produces alkyl pyrazines, which contribute to the flavors in roasted, toasted, or thermally processed foods. Due to the ease of its decomposition, a large portion of methional is lost during potato processing. Similarly, in the presence of flavin mononucleotide (FMN) and light, methionine is nonenzymatically oxidized into methional, ammonia, and carbon dioxide.〔S. F. Yang, H. S. Ku & H. K. Pratt (1967) Photochemical Production of Ethylene from Methionine and Its Analogues in the Presence of Flavin Mononucleotide, The Journal of Biological Chemistry, 242, 5274-5280.〕 :CH3SCH2CH2(NH2)CHCO2H → CH3SCH2CH2CHO + NH3 + CO2 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Methional」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.