Effects of high pressure homogenisation of raw bovine milk on alkaline phosphatase and microbial inactivation. A comparison with continuous short-time thermal treatments

Abstract : Raw whole milk of high microbial quality (58 degrees C), but markedly decreased above 200 MPa when Tin=24 degrees C (T2>60 degrees C). In contrast to inactivation induced by continuous short-time thermal treatments, ALP inactivation induced by HP homogenisation was clearly due to mechanical forces (shear, cavitation and/or impact) in the HP valve and not to the short (<1 s) residence time at temperature T2 in the same valve. Inactivation of the three exogenous microorganisms led to similar conclusions. Homogenisation at 250 MPa or 300 MPa (Tin=24 degrees C) induced a 2-3 log cycle reduction of the total endogenous milk flora and a 1.5-1.8 log cycle reduction of inoculated List. innocua. Higher reduction ratios (2-4 log cycles) were obtained for the two other microorganisms. The highest levels of ALP inactivation corresponded to the highest extents of microbial reduction. Running the milk twice or three times through the homogeniser (recycling), keeping temperature T1 approximately 29 degrees C and pressure=200 MPa, increased homogenisation efficiency.
Liste complète des métadonnées

https://hal.umontpellier.fr/hal-02059807
Contributeur : Laetitia Palmade <>
Soumis le : mercredi 6 mars 2019 - 21:14:13
Dernière modification le : vendredi 29 mars 2019 - 09:12:13

Lien texte intégral

Identifiants

Collections

Citation

Laetitia Picart, Maryse Thiebaud, Malika René, Joseph Pierre Guiraud, Jean Claude Cheftel, et al.. Effects of high pressure homogenisation of raw bovine milk on alkaline phosphatase and microbial inactivation. A comparison with continuous short-time thermal treatments. Journal of Dairy Research, Cambridge University Press (CUP), 2006, 73 (04), pp.454. ⟨10.1017/S0022029906001853⟩. ⟨hal-02059807⟩

Partager

Métriques

Consultations de la notice

55