A differential pulse polarographic (DPP) method has been developed for the determination of ascorbic acid (AA) and dehydroascorbic acid (DHA), the two main forms of Vitamin C. The method consists of the DPP analysis of a quinoxaline obtained by the derivatization of DHA with o-phenylenediamine. Results using the proposed method correlated well with those obtained by two reference methodologies: the common iodometric method and a published chromatographic methodology. It was also used in the study of Vitamin C degradation in fruit juices, showing that it involves an initial oxidation of AA to DHA, followed by hydrolytic degradation of the latter.
一种差分脉冲极谱法(
DPP)已经开发用于测定
维生素C的两种主要形式——
抗坏血酸(
AA)和去氢
抗坏血酸(
DHA)。该方法包括对
DHA进行取代反应,得到
喹啉并进行
DPP分析。所提出的方法的结果与两种参考方法(常见的
碘量法和已发表的色谱方法)的结果相关良好。它还被用于研究果汁中
维生素C的降解,结果表明它涉及
AA氧化为
DHA的初始阶段,然后是后者的
水解降解。