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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Lowry protein assay ： ウィキペディア英語版 Lowry protein assay The Lowry protein assay is a biochemical assay for determining the total level of protein in a solution. The total protein concentration is exhibited by a color change of the sample solution in proportion to protein concentration, which can then be measured using colorimetric techniques. It is named for the biochemist Oliver H. Lowry who developed the reagent in the 1940s. His 1951 paper describing the technique is the most-highly cited paper ever in the scientific literature, cited over 300,000 times. == Mechanism == The method combines the reactions of copper ions with the peptide bonds under alkaline conditions (the Biuret test) with the oxidation of aromatic protein residues. The Lowry method is best used with protein concentrations of 0.01–1.0 mg/mL and is based on the reaction of Cu+, produced by the oxidation of peptide bonds, with Folin–Ciocalteu reagent (a mixture of phosphotungstic acid and phosphomolybdic acid in the Folin–Ciocalteu reaction). The reaction mechanism is not well understood, but involves reduction of the Folin–Ciocalteu reagent and oxidation of aromatic residues (mainly tryptophan, also tyrosine). Experiments have shown that cysteine is also reactive to the reagent. Therefore, cysteine residues in protein probably also contribute to the absorbance seen in the Lowry Assay. 〔Everette, Jace D.; Bryant, Quinton M.; Green, Ashlee M.; Abbey, Yvonne A.; Wangila, Grant W.; Walker, Richard B. (2010). "Thorough Study of Reactivity of Various Compound Classes toward the Folin−Ciocalteu Reagent". J. Agric. Food Chem. 58 (14): 8139. doi:10.1021/jf1005935. PMID 20583841.〕 The concentration of the reduced Folin reagent is measured by absorbance at 750 nm. As a result, the total concentration of protein in the sample can be deduced from the concentration of Trp and Tyr residues that reduce the Folin–Ciocalteu reagent. The method was first proposed by Lowry in 1951. The Bicinchoninic acid assay and the Hartree–Lowry assay are subsequent modifications of the original Lowry procedure. 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「Lowry protein assay」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.