The protein content in protein powder is determined using the first method of GB 5009.5-2016 automatic Kjeldahl nitrogen analyzer,with reference to CNAS-GL006:2019 and JJF 1059.1-2012 for protein measurement uncertainty evaluation.The results showed that the protein content in protein powder was determined to be 86.90 g/100 g using the Kjeldahl nitrogen analyzer method,with an expanded uncertainty of 2.64 g/100 g.Therefore,the protein content determination result was reported as(86.90±2.64)g/100 g.The main factor affecting the uncertainty of protein determination in protein powder is the nitrogen determination process,followed by sample weighing,pretreatment,sample measurement,and hydrochloric acid standard solution drop concentration.
关键词
蛋白粉/蛋白质/不确定度/凯氏定氮法
Key words
protein powder/protein/uncertainty/Kjeldahl nitrogen determination method
维普
万方数据