Determination of chloride in infant formula and adult/pediatric nutritional formula by potentiometric titration: Single-laboratory validation, first action 2015.07

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[1] Bolong, Wu
[2] Fengxia, Zhang
[3] Xiaoning, Ma
[4] Fengjuan, Zhou
[5] Brunelle, Sharon L.
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Fengxia, Zhang (zhangfengxia@caiqtest.com) | 2016年 / AOAC International卷 / 99期
关键词：
A potentiometric method for determination of chloride was validated against AOAC Standard Method Performance Requirement (SMPR®) 2014.015. Ten AOAC Stakeholder Panel on Infant Formula and Adult Nutritionals (SPIFAN ) matrixes; including National Institute of Standards and Technology (NIST) Standard Reference Material (SRM) 1849a; were tested in duplicate on 6 independent days. The repeatability (RSDr) ranged from 0.43 to 1.34%; and the intermediate reproducibility (RSDiR) ranged from 0.80 to 3.04%. All results for NIST SRM 1849a were within the range of the certified concentration (701 ± 17 mg/100 g). Recovery was demonstrated with two overspike levels; 50; and; 100%; in the 10 SPIFAN matrixes. Samples were tested in duplicate on 3 different days; and all results were within the SMPR requirement of 95 to 105%. The LOQs of the method for powdered products and ready-to-feed or reconstituted products were 20 mg/100 g and 2.2 mg/100 mL; respectively. A wide analytical range from the LOQ to 99.5% chlorine content can be reached with an appropriate dilution factor; but in practice; the upper analytical value observed in routine matrix testing was approximately 1080 mg/100 g in skim milk powder. This is a rapid; simple; and reliable chlorine-testing method applicable to infant formula; adult nutritionals; and ingredients used in these dairy-based products; such as skim milk powder; desalted whey powder; whey protein powder; and whole milk powder;
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