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柑桔果实的糖、酸、维生素丙的定量测定,对柑桔品种比较鉴定,柑桔施肥、贮运等研究有重要的意义。为适应当前科学实验需要,兹介绍这些化学成分的简易而迅速的测定方法,供有关方面参考。一、糖的测定测定的方法是以还原糖在碱性溶液中能将硫酸铜还原为氧化亚铜的特性为基础,用待测液直接滴定一定体积、已知浓度的铜碱性溶液,以次甲基兰为指示剂,由于次甲基兰能被碱
Quantitative determination of sugar, acid and vitamin C in citrus fruits is of great significance for the comparative identification of citrus varieties, citrus fertilization, storage and transportation. In order to meet the needs of the current scientific experiments, it is introduced to these simple and rapid chemical composition determination method for reference. First, the determination of sugar Determination of reducing sugar in alkaline solution can be reduced to copper sulfate cuprous oxide based on the characteristics of the test solution with direct titration of a certain volume, known concentration of copper alkaline solution to Methyl blue as an indicator, since methylan blue can be alkali