Correlation Analysis between Properties and Calcium-holding Capacity of Different Casein Phosphopeptide Products

Abstract

In order to investigate the influence of the properties of casein phosphopeptide(CPP) on its calcium-holding capacity, the content of CPP, nitrogen and phosphorus content, molecular weight distribution, amino acid composition and content were determined using 7 kinds of commercial CPP products. The correlation between physical and chemical properties and calcium holding capacity was analyzed. The results showed that the CPP content and N/P of 7 kinds of CPP products were 1.30%~18.50% and 12.70~46.80, respectively. The content of total amino acid of 7 kinds of CPP products were 70.50~901.00 mg/g, and proline was the most abundant amino acid among those CPP products. The molecular weight of those CPP products were 10 kDa showed a highly significant negative correlation with the calcium-holding capacity of CPP samples(correlation coefficient −0.985~−0.975, P<0.01), while CPP samples with similar molecular weight distribution and higher content of isoleucine(correlation coefficient 0.766~0.768, P<0.05) and phenylalanine(correlation coefficient 0.758~0.759, P<0.05) showed a stronger calcium-holding capacity. This study provided a theoretical basis for evaluating and improving the quality of CPP products.