用于测定碎牛肉中防腐剂的快速筛选程序：亚硫酸盐、苯甲酸盐、山梨酸盐和抗坏血酸盐。
Rapid screening procedure for the determination of preservatives in ground beef: sulfites, benzoates, sorbates, and ascorbates.
作者信息
Karasz A B, Maxstadt J J, Reher J, Decocco F
出版信息
J Assoc Off Anal Chem. 1976 Jul;59(4):766-9.
A procedure is described for the examination of large numbers of ground beef samples for the 4 most commonly used preservatives. A single sample solution is prepared and aliquots are taken for the various tests. Sulfite is determined colorimetrically with acid-bleached prosaniline. Ascorbic acid is titrated with 2,6-dichloroindophenol. Benzoic and sorbic acids are measured by ultraviolet absorption. Negative samples are rapidly sorted out in this procedure and positive samples are completed for quantitative determination of the preservative. Recoveries are 95% for sodium sulfite, 103% for sodium benzoate, 90% for potassium sorbate, and 81% expected recovery for sodium ascorbate. The limit of detection is 0.005% for potassium sorbate, and 0.001% for the 3 other perservatives.
本文描述了一种用于检测大量碎牛肉样品中4种最常用防腐剂的方法。制备单一样品溶液，并取等分试样进行各种测试。亚硫酸盐用酸漂白的对氨基苯磺酸比色法测定。抗坏血酸用2,6-二氯靛酚滴定。苯甲酸和山梨酸通过紫外吸收测定。在此过程中可快速筛选出阴性样品，阳性样品则完成防腐剂的定量测定。亚硫酸钠的回收率为95%，苯甲酸钠为103%，山梨酸钾为90%，抗坏血酸钠预期回收率为81%。山梨酸钾的检测限为0.005%，其他3种防腐剂的检测限为0.001%。
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