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Characterization of a goat whey peptic hydrolysate produced by an ultrafiltration membrane enzymic reactor

Published online by Cambridge University Press:  02 January 2001

STÉPHANIE BORDENAVE
Affiliation:
Laboratoire de Génie Protéique et Cellulaire, UPRES 2001, UFR Sciences, Université de La Rochelle, Avenue Marillac, F-17042 La Rochelle cédex 01, France
FRÉDÉRIC SANNIER
Affiliation:
Laboratoire de Génie Protéique et Cellulaire, UPRES 2001, UFR Sciences, Université de La Rochelle, Avenue Marillac, F-17042 La Rochelle cédex 01, France
GUY RICART
Affiliation:
Laboratoire de Spectrométrie de Masse, Bâtiment C4, Université des Sciences et Techniques de Lille, F-59655 Villeneuve d'Ascq cédex, France
JEAN-MARIE PIOT
Affiliation:
Laboratoire de Génie Protéique et Cellulaire, UPRES 2001, UFR Sciences, Université de La Rochelle, Avenue Marillac, F-17042 La Rochelle cédex 01, France

Abstract

Goat whey was hydrolysed by pepsin in an ultrafiltration membrane enzymic reactor coupled with a 30 kDa mineral membrane. Peptides collected in the permeate were resolved using reversed-phase HPLC. Their sequences were determined by amino acid analysis, second order derivative spectra analysis and mass spectrometry. Owing to the resistance of β-lactoglobulin (β-lg) towards pepsin, the majority of peptides identified were derived from α-lactalbumin (α-la). Pepsin showed a broad specificity of hydrolysis sites and generated a wide range of products from dipeptides to very large peptides containing disulphide bridges. The molecular masses of peptides resulting from α-la degradation were between 150 and 6900 Da: 36% were < 600 Da, 24% were 600–2000 Da and 40% were > 2000 Da.

Type
Original article
Copyright
Proprietors of Journal of Dairy Research 2000

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