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桔子粉是用白砂糖、柠檬酸、香料以及色素加工而成的饮料。所用色素为柠檬黄和胭脂红。这两种由煤焦油产物提炼得到的人工合成色素具有毒性,用量太大时对人体健康不利。我国卫生规定这些人工合成色素的最大允许用量为万分之一。我们利用导数分光光度法不必进行预处理和解联立方程直接测定了桔子粉中色素的含量,相对标准偏差为±1.0％,平均回收率为97.3％。方法原理:从柠檬黄和胭脂红在Beckman DU-7HS型分光光度计上获得的—阶导数谱图。 (扫描速度为1200纳米/分,△λ为4.0)可知:在548nm处柠檬黄对胭脂红的谱图无干扰。为了求得柠檬在468nm处导数峰值,可以利用已知浓度的胭
Orange powder is white sugar, citric acid, spices and color processed beverages. The colors used are lemon yellow and carmine. Both synthetic anthropomorphic pigments extracted from coal tar products are toxic and are harmful to human health when the dosage is too large. China’s health provisions of these synthetic pigments maximum allowable dosage of one ten thousandth. We use derivative spectrophotometry to directly determine the pigment content in orange powder without preconditioning and solving the simultaneous equations with the relative standard deviation of ± 1.0% and the average recovery of 97.3%. Principle of the method: - Derivative spectra obtained from lemon yellow and carmine on a Beckman DU-7HS spectrophotometer. (Scanning speed of 1200 nm / min, Δλ of 4.0) shows that there is no interference with the carmine yellow spectrum at 548 nm. In order to find the derivative peak of lemon at 468nm, we can use the known concentration of rouge