市售果汁饮料中维生素C含量的测定  

Determination of Vitamin C in Commercial Juices

作　　者：李仪[1] 王盘江 莫韵娴 燕倩 桂腾越 罗绪强[1] 

机构地区：[1]贵州师范学院地理与旅游学院,贵州贵阳550018

出　　处：《广东化工》2016年第19期183-184,182,共3页Guangdong Chemical Industry

基　　金：贵州省科技厅自然科学基金资助项目(黔科合J字[2014]2138号);贵州师范学院自然科学基金资助项目(13BS021)

摘　　要：文章采集了4个品牌12种市售果汁饮料：美汁源酷儿苹果汁、美汁源酷儿橙汁、美汁源酷儿葡萄汁、统一鲜橙多、统一葡萄多、统一水蜜桃、康师傅鲜果橙、康师傅每日C（葡萄汁）、康师傅水蜜桃、汇源100%橙汁、汇源100%葡萄汁和汇源100%苹果汁,采用间接碘量法对其中维生素C含量进行测定,分析讨论影响市售果汁饮料中维生素C含量的因素,并对市售果汁的每日饮用量进行了计算。结果表明：采集的12种市售果汁饮料中均含有维生素C,虽然与其标签值相比,相差了3.91%-9.46%,均明显偏低,但市售果汁饮料中维生素C的含量与其标签值还是有很大程度的符合,考虑到维生素C含量易受外界因素影响而降低,12种市售果汁饮料中维生素C含量与标签值相比偏低属于正常现象,在选购市售果汁饮料时,应主要以市售果汁饮料外包装上的标签值为参考,以生产日期较近者为优先,且市售果汁饮料的存储和饮用温度应低于50℃。每人每日所需维生素C为100 mg,以常温下测定的果汁饮料中维生素C含量为依据计算12种市售果汁饮料的每日饮用量,美汁源果汁的每日饮用量3.2瓶（约1400 m L）,统一和康师傅果汁的每日饮用量为1.6瓶（约700 m L）,汇源100%果汁的每日饮用量为0.2瓶（约100 m L）。12 kinds of commercial juice from four brands were collected in the paper： Meizhiyuan Apple Juice, Meizhiyuan Orange Juice, Meizhiyuan Grape Juice, Tongyi Orange Juice, Tongyi Grage Juice, Tongyi Peach Juice, Kangshifu Orange Juice, Kangshifu Daily C（grape juice）, Kangshifu Peach Juice, Huiyuan 100 % Orange Juice, Huiyuan 100 % Grape Juice and Huiyuan 100 % Apple Juice. Indirect iodometry was chosen to determine the content of vitamin C in juices, the factors affecting the vitamin C content in juice were analyzed and discussed, and the maximum daily consumption amount of juice were also calculated, The results showed that： the collected commercial juices all contain vitamin C. However, the content of vitamin C in juices was dignificantly lower by 3.91 %-9.46 % than its label value. Considering the instability of vitamin C, this observation was normal. Still there was significant consistency between the content of vitamin C in juice and its label value. It was suggested that the label value of vitamin C had reference value, the latest production should be chosen for the purchase of juices, and the temperature of storing and drinking juice should be lower than 50 ℃. The daily requirement of vitamin C was 100 mg for a person. Based on the measurement of vitamin C in juices at room temperature, the maximum daily consumption amount of Meizhiyuan juices were 3.2 bottle（about 1400 m L）, Kangshifu and Tongyi juices were 1.6 bottle（about 700 m L）, Huiyuan 100 % juices were 0.2 bottle（about 100 ml）.

关 键 词：果汁饮料 维生素C 间接碘量法 

分 类 号：O65[理学—分析化学]