脐橙常规品质测定及复检的主要影响因素研究  

Main Influencing Factors to Navel Orange Quality Testing and Retesting

作　　者：刘小云 江昱轩 王智情 胡珊玲[1] 罗海清[1] 林燕 LIU Xiaoyun;JIANG Yuxuan;WANG Zhiqing;HU Shangling;LUO Haiqing;LIN Yan(Citrus Testing Center of Gannan Normal University,Ganzhou 341000,China)

机构地区：[1]赣南师范大学柑橘检测中心,江西赣州341000

出　　处：《赣南师范大学学报》2020年第6期100-103,共4页Journal of Gannan Normal University

基　　金：江西省教育厅科技项目(GJJ170837)。

摘　　要：对脐橙鲜果中可溶性固形物、总酸、维生素C等常规品质测定的主要影响因素及复检时的留样要求进行研究.结果表明:总酸测定时滴定剂氢氧化钠标准溶液的滴定速度需加以严格控制,以确保标定结果的精密度符合国家标准要求;维生素C测定时滴定剂的储存温度和时间对结果具有重要影响,标定用基准抗坏血酸需现配现用;可溶性固形物和总酸测定的留样要求为4℃匀浆留样,维生素C为-20℃匀浆留样,以满足复检的重现性要求.The main influencing factors on the determination of soluble solids,total acid and vitamin C in fresh navel oranges and the storage conditions for retesting were studied.The results show that titration rate of sodium hydroxide standard solution must be strictly controlled during total acid determination so as to ensure precision and accuracy.Storage temperature and time of titrant have an important impact on vitamin C determination.The primary standard of ascorbic acid for DCIP calibration need to be prepared just before use.Sample storage for soluble solids and total acid testing are required to be at 4℃ and vitamin C at-20℃ to ensure reproducibility of retesting.

关 键 词：脐橙 可溶性固形物 总酸 维生素C 复检 

分 类 号：S666.4[农业科学—果树学]