脱氢抗坏血酸
化学
抗坏血酸
色谱法
二硫苏糖醇
高效液相色谱法
反相色谱法
维生素C
生物化学
酶
食品科学
作者
S. J. Ziegler,Beat H. Meier,Otto Sticher
标识
DOI:10.1016/s0021-9673(01)94343-2
摘要
An improved procedure for the direct determination of l-dehydroascorbic acid (DHAA), in addition to l-ascorbic acid (AA), has been developed. The two biologically active forms of vitamin C were separated using reversed-phase high-performance liquid chromatography. DHAA was reduced to AA with dithiothreitol (DTT) in a post-column reaction system. Complete conversion was achieved at 50°C using a 1-ml reaction coil. Recoveries were in the range of 95–99% and both forms could be detected spectrophotometrically at 267 nm with high sensitivity. Reproducible results [relative standard deviations 2.4% (DHAA) and 1.0% (AA), n = 5] were obtained when the method was applied to the analysis of rose hip samples.
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