Hydrolysis of ovine, caprine and bovine whey proteins by trypsin and pepsin

• Type: Article in International Scientific Journal
• Date: 2000

Authors

Pintado, ME (Author) Other; F. Xavier Malcata (Author) Other

Journal

Title: Bioprocess Engineering

Vol. 23

Pages: 275-282

ISSN: 0178-515X

Publisher: Springer

Indexing

ISI Web of Knowledge - 16 Citations

Scopus - 24 Citations

Other information

Authenticus ID: P-000-Z10

DOI: 10.1007/s004499900167

Abstract (EN): Direct hydrolysis of whey leads to peptides that possess higher digestibility and better functional properties, so they may to advantage be incorporated in food formulae to improve their performance. Incubation of pure bovine alpha-La and beta-Lg, as well as of caprine, bovine and ovine wheys with trypsin and pepsin led to production of various hydrolysates, which absorb at 280 nm and are characterized by molecular weights ranging from ca. 8000 Da to less than 500 Da. Bovine alpha-La was slowly hydrolyzed by trypsin but rapidly by pepsin, in either pure form or in whole whey. Bovine beta-Lg was more rapidly broken down by trypsin, and less rapidly by pepsin than alpha-La, and a similar performance was observed when beta-Lg was tested on whole whey. In most whey digests, a peak corresponding to a molecular weight comprised between 3000 and 4000 Da was observed by gel permeation chromatography; it was detected mainly in ovine and caprine wheys, and grew slowly with incubation time in bovine whey but fast in wheys from the small ruminants. Incubation of the fraction corresponding to the unknown peak with pepsin did not produce any effect detectable by chromatography, yet incubation with trypsin led to a decrease of the area of such peak and concomitant rise of the areas accounted for by low molecular weight peptides.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 8