Effect of a pre-treatment of milk with high pressure homogenization on yield as well as on microbiological, lipolytic and proteolytic patterns of "Pecorino" cheese.
The principal aim of this work was to compare Pecorino cheeses obtained from ewes' milk previously subjected to high pressure homogenization (HPH) at 100 MPa with those produced from raw and heat treated ewes' milk. The HPH milk treatment induced a significant increase of the cheese yield and caused a reduction of enterococci, lactococci and yeasts in the curds. Enterococci cell loads remained at lower levels in cheeses obtained from HPH milk over the ripening period. Analyses of free fatty acids, Sodium Dodecil Sulphate (SDS)-PAGE profiles, Gas Chromatography-Mass Spectrometry-Solid Phase Microextraction (GC-MS-SPME) measurements of volatile compounds and sensory traits evidenced that the pressure treatment can be regarded also as a useful tool to differentiate products obtained from the same raw material. In fact such a milk treatment induced a marked lipolysis, an early proteolysis, a relevant modification of the volatile molecule profiles and sensory properties of Pecorino cheese.
Vannini
Lucia
L
Dipartimento di Scienze degli Alimenti, University of Bologna, Viale G. Fanin 46, 40127 Bologna, Italy.
Patrignani
Francesca
F
Iucci
Luciana
L
Ndagijimana
Maurice
M
Vallicelli
Melania
M
Lanciotti
Rosalba
R
Guerzoni
Maria Elisabetta
ME
D000818:Animals; D002611:Cheese / Q000382:microbiology* / Q000592:standards*; D015169:Colony Count, Microbial; D004591:Electrophoresis, Polyacrylamide Gel; D005223:Fats / Q000378:metabolism; D005230:Fatty Acids, Nonesterified / Q000032:analysis; D005260:Female; D005285:Fermentation; D005511:Food Handling / Q000295:instrumentation / Q000379:methods*; D005516:Food Microbiology; D005524:Food Technology; D008401:Gas Chromatography-Mass Spectrometry; D006358:Hot Temperature; D006874:Hydrostatic Pressure; D008066:Lipolysis; D008892:Milk / Q000737:chemistry / Q000382:microbiology*; D008894:Milk Proteins / Q000378:metabolism; D012756:Sheep; D052617:Solid Phase Microextraction; D013045:Species Specificity; D013649:Taste; D014835:Volatilization
D005223:Fats; D005230:Fatty Acids, Nonesterified; D008894:Milk Proteins