Effects of ultra-high-pressure homogenization treatment on the lipolysis and lipid oxidation of milk during refrigerated storage.
Free fatty acid (FFA) release and quantification and lipid oxidation extent of ultra-high-pressure homogenized (UHPH) milk samples were evaluated to assess the effect of UHPH on the susceptibility of milk lipids to lipolysis and oxidation. Milk was UHPH-treated at 200 and 300 MPa with inlet temperatures of 30 and 40 degrees C. UHPH-treated samples were compared to high-pasteurized milk (PA; 90 degrees C, 15 s). Results showed that all FFA increased significantly during storage only in 200 MPa samples. Lipid oxidation was measured as an accumulation of lipid hydroperoxides as the primary oxidation product and malondialdehyde and hexanal as the secondary oxidation products. Samples treated at 300 MPa presented higher malondialdehyde and hexanal content compared to 200 MPa treated-samples and to PA milk.
Pereda
Julieta
J
Centre Especial de Recerca Planta de Tecnologia dels Aliments, XaRTA, XiT, Departament de Ciència Animal i dels Aliments, Facultat de Veterinària, Universitat Autònoma de Barcelona, 08193 Bellaterra, Spain.
Ferragut
Victoria
V
Quevedo
Joan Miquel
JM
Guamis
Buenaventura
B
Trujillo
Antonio J
AJ
D000447:Aldehydes / Q000032:analysis; D000818:Animals; D003080:Cold Temperature; D005230:Fatty Acids, Nonesterified / Q000032:analysis; D005511:Food Handling / Q000379:methods*; D005519:Food Preservation; D015227:Lipid Peroxidation; D008055:Lipids / Q000737:chemistry*; D008066:Lipolysis; D008892:Milk / Q000737:chemistry*; D011312:Pressure; D013696:Temperature
D000447:Aldehydes; D005230:Fatty Acids, Nonesterified; D008055:Lipids; C010463:n-hexanal