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[求助] 糖苷加水分解中用到的cysteine的作用

皂苷加水分解中,糖和苷元分离后,糖样品中分别加入L-cysteine和D-cysteine反应,然后HPLC分析。这个cysteine起到的是什么作用呢?求大侠详细解答。
看了篇糖和cysteine作用反应的论文,没怎么理解。
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