A total of 7.21 g of dry mixture with a protein content of 89.2% (w/w) determined by Kjeldahl analysis was dissolved in 88.54 g of sterile water and centrifuged to purify the protein in the mixture. After centrifugation, a total of 5.95 g of precipitated pellet was formed, and the protein content in pellet was determined as 72.2% by spectrophotometric Lowry analysis. Assume that pellet is not a hygroscopic material and does not absorb any water. Determine the following: a. the protein concentration in the supernatant layer after centrifugation in % w/w b. the nature of amino acids in the protein structure. What's the possible explanation?

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