Amino Acid and Secondary Structure Integrity of Sonicated Milk Proteins
AUSTRALIAN JOURNAL OF CHEMISTRY(2020)
摘要
amino acid and secondary structural integrity of dairy proteins. Sonicated skim milk proteins were hydrolysed and analysed with reverse-phase high-performance liquid chromatography to investigate the amino acid content of the processed samples. It was successfully demonstrated that both low-frequency and high-frequency ultrasound did not adversely affect the amino acid content, even after prolonged extreme processing conditions (6 h, 355 kHz). This finding was supplemented with protein secondary structure data (Fourier-transform (FT)-IR secondary derivatives of the amide I band, 1700-1600 cm 1) that showed that ultrasound was capable of causing structural modifications to the dairy proteins. This study shows that ultrasound can be used to influence protein-protein interactions in skim milk via alterations to the secondary structure without degrading the amino acids in the proteins.
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