苯甲酸钠光谱检测及应用  

Spectrophotometric quantitative detection of sodium benzoate and its application

作　　者：张会[1] 陈兆凡 李娇[1] 焦志勇[1] ZHANG Hui;CHEN Zhao-fan;LI Jiao;JIAO Zhi-yong(China University of Petroleum,Qingdao 266580 ,Chin)

机构地区：[1]中国石油大学(华东),山东青岛266580

出　　处：《光电子．激光》2018年第7期754-759,共6页Journal of Optoelectronics·Laser

基　　金：中央高校基本科研业务费专项资金(14CX02142A)资助项目

摘　　要：随着食品添加剂的增多,食品安全及其监测成为关系人体健康的重要问题。而吸收光谱可以定性分析物质并进行识别,并结合朗伯比尔定律通过吸光度与样品浓度的关系可以获得浓度信息。因此,本文提出了基于吸收光谱法的苯甲酸钠等食品添加剂的定性及定量检测方法;通过紫外、可见吸收光谱分析法对常见的食品样品及其添加剂的吸收光谱进行了测量;分析了市场上的饮料及天然饮料的吸收光谱及其添加色素和防腐剂的紫外可见及近红外吸收光谱;并获得常见饮料添加剂的特征光谱;饮料中的常见添加防腐剂苯甲酸钠、山梨酸钾吸收峰值波长分别为252.9nm、294.38nm;采用波长为252.9nm单色光测得不同浓度苯甲酸钠下的吸光度,建立了苯甲酸钠浓度光谱数据库,为食品添加剂的定性定量监测提供了理论基础。这种非接触的光学定性分析及定量分析方法为食品的实时监测的实现提供了新的途径。With the increase of food additives,food safety and its monitoring ha ve become an important issue related to human health.Absorption spectroscopy can qualitatively analyze substances and identify them.Furthermore,combined with the Lambert′s law,the concentration information can be obtained through th e relationship between absorbance and sample concentration.In this paper,qualitative and quantitative detection meth ods for food additives,such as sodium benzoate,are proposed based on absorption spectroscopy.The samples are natural beverages and beverages with pigment and preservatives.The absorption spectra in ultraviolet and visible ran ge for these samples are measured.The characteristic spectra of synthetic pigment and common preservatives,including s odium benzoate,potassium sorbate, sodium citrate and sodium carboxymethyl cellulose（CMC）,are obtained and an alyzed.The results show that the peak absorption wavelengths of sodium benzoate and potassium sorbate are 252.9nm and 294.38nm,respectively. Furthermore,the absorbances of sodium benzoate under different concentrations a re measured by the monochromatic light with wavelength at 252.9nm.The relationship between absorbance and concentration is established.In summary,absorption spectroscopy,as an optical qualitative and quantitative analysis method, which is a non-contact measurement method,provides a new way for real- time monitoring of food.

关 键 词：紫外、可见及近红外吸收光谱 食品添加剂 非接触测量 

分 类 号：O433[机械工程—光学工程]