利用分光光度法鉴定桑果饮料的质量

摘要

分光光度法检测发现，桑果饮料乙醇提取液的吸光度值与桑果原汁含量成正比，随pH、贮存时间和贮存条件的不同而变化。随时间的延长，常温条件下贮存的桑果饮料在峰吸收处的吸光度值逐渐降低，直至失去峰吸收，低温避光保存可有效地保存桑果饮料的吸收峰值。桑果饮料的乙醇提取液主要含花青素，分光光度法检测主要反映了桑果饮料中花青素的含量变化，通过对桑果饮料乙醇提取液的分光光度法检测可以了解桑果饮料的质量情况。%Spectrophotometric method was applied to determine the quality of mulberry drink. It was found that the absorption value (A) of ethanol extract of mulberry drink would change with the content of mulberry juice, pH, storage time and other conditions. A 520 was in direct proportion to the content of mulberry juice. Stored at room temperature, A 520decreased gradually with the prolongation of storage time. To store at low temperature and in dark could effectively keep the absorption peak value of mulberry drink. The main component in ethanol extract of mulberry drink was anthocyanin and the change of absorption value reflected its content in mulberry drink.