A New Regression Equation of pH Drop Procedure for Measuring Protein Digestibility

  • Ryu, Hong-Soo ;
  • Hwang, Eun-Young ;
  • Lee, Jong-Yeoul ;
  • Cho, Hyun-Kyoung
  • Published : 1998.06.01


A regression equation was proposed for predicting protein digestibility using pH drop and free amino acid content. Results were compared with those determined by the pH drop method of Satterle et al. and with apparent in vivo digestibility in rats. Measurd free amino acid content prior to four enzyme digestion had an influence on calculating digestbiilty . Results from new equation correlated more highly (r=0.8434, difference average=2.304) with in vivo digestibility than the results of pH drop method (r=0.7603, difference average=10.099).


regression equation;in vitro protein digestibility;pH drop procedure