Journal
FOOD CHEMISTRY
Volume 263, Issue -, Pages 127-134Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2018.04.128
Keywords
UHT milk; AprX; Plasmin; Gelation; Destabilization; Hydrolysis; Shelf life
Funding
- Sino Dutch Dairy Development Center
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Destabilization of UHT milk during its shelf life is mainly promoted by the residual proteolytic activity attributed to the psychrotrophic bacterial proteases and native milk proteases. In this study, we built skim UHT milk-based model systems to which either the major bacterial protease (AprX from Pseudomonas fluorescens), or the major native milk protease (plasmin) was added, to allow a direct comparison between the destabilization of skim UHT milk by both categories of enzymes. The physical and chemical properties were studied during 6 weeks. Our results showed AprX induced compact gels when almost all the kappa-casein was hydrolyzed and the degree of hydrolysis (DH) exceeded 1.3%. Plasmin induced soft gels when around 60% of both beta- and alpha(s1)-casein were hydrolyzed and the DH reached 2.1%. The knowledge gained from this study may be used for developing diagnostic tests for determining the protease responsible for UHT milk destabilisation.
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