紫外分光光度法测定食糖中的硝酸盐含量  

Determination of Nitrate in Sugar by UV Spectrophotometry

作　　者：陈嘉敏[1,2] 陈建津[1,2] 张志强[1,2] 余构彬[1,2] 李海乔[1,2] 林小贞 CHEN Jia-min CHEN Jian-jin ZHANG Zhi-qiang YU Gou-bin LI Hai-qiao LIN Xiao-zheng(Guangdong Provincial Bioengineering Institute （Guangzhou Sugarcane Industry Research Institute）/Guangdong Key Lab of Sugarcane Improvement ＆ Biorefinery, Guangzhou 510316 China Sugar Inspection Center, Guangzhou 510316 Zhongshan Quality Supervision ＆ Institute of Agricultural Products, Zhongshan, Guangdong 528401)

机构地区：[1]广东省生物工程研究所(广州甘蔗糖业研究所)广东省甘蔗改良与生物炼制重点实验室,广东广州510316 [2]国家糖业质量监督检验中心,广东广州510316 [3]中山市农产品质量监督检验所,广东中山528401

出　　处：《甘蔗糖业》2017年第2期61-65,共5页Sugarcane and Canesugar

基　　金：广东省科技计划项目(2013B040400003;2013B061800023;2013B061800007;2014B040404054;2016A040403066);广东省科学院项目(2016GDASPT-010)

摘　　要：建立了检测食糖中硝酸盐含量的紫外分光光度法。食糖样品加入氨缓冲溶液超声提取后,经活性炭脱色,加入亚铁氰化钾溶液和乙酸锌溶液沉淀蛋白质和脂肪等杂质,在紫外分光光度计中波长220nm和275 nm处通过标准曲线法进行比较定量。该方法在10~200μg线性良好(R2=0.9997),检出限为1.875 mg/kg,分别在样品中添加硝酸钠标准品进行3个水平加标回收实验(3、30、100 mg/kg),回收率范围为92.8%~96.8%,相对标准偏差为1.5%~3.1%(n=6)。该方法样品前处理简单、快速,灵敏度、准确度和精密度均满足食糖中硝酸盐的检测要求。A method was developed for the determination of nitrate in sugar by UV spectrophotometry. The sugar samples were extracted by ultrasonic with ammonia buffer solution, decolored with activated carbon, precipitated with potassium ferrocyanide and zinc acetate for protein, fat and other impurities and then detected by UV spectrophotometer at 220 nm and 275 nm. There was a good linear relationship between the absorbance and the content of nitrate in the range of 10-200 μg （R2=0.9997）. The limit of detection （LOD） was 1.875 mg/kg. The recoveries at three levels of 3, 30 and 100 mg/kg were from 92.8% to 96.8% and the relative standard deviation （RSD） of 1.5%～3.1% （n=6）, respectively. The method is simple, rapid and characterized with acceptable sensitivity, accuracy and precision to meet the requirements of nitrate analysis in sugar.

关 键 词：食糖 硝酸盐 紫外分光光度法 

分 类 号：TS207[轻工技术与工程—食品科学]