Uncertainty Evaluation for Determination of Protein in Protein Powder
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.
protein powderproteinuncertaintyKjeldahl nitrogen determination method
万方数据
维普
