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High pressure homogenization inactivation of Escherichia coli and Staphylococcus aureus in phosphate buffered saline, milk and apple juice
Author(s) -
Dong P.,
Zhou B.,
Zou H.,
Wang Y.,
Liao X.,
Hu X.,
Zhang Y.
Publication year - 2021
Publication title -
letters in applied microbiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.698
H-Index - 110
eISSN - 1472-765X
pISSN - 0266-8254
DOI - 10.1111/lam.13487
Subject(s) - pasteurization , staphylococcus aureus , escherichia coli , sterilization (economics) , food science , chemistry , carrot juice , saline , phosphate buffered saline , microbiology and biotechnology , homogenization (climate) , bacteria , biology , chromatography , biochemistry , biodiversity , ecology , genetics , gene , monetary economics , economics , foreign exchange market , endocrinology , foreign exchange
Abstract High pressure homogenization (HPH) offers new opportunities for food pasteurization/sterilization. Escherichia coli and Staphylococcus aureus suspended in phosphate buffered saline (PBS) buffer, milk and apple juice at initial concentration of ~10 6 log 10 CFU per ml were subjected to HPH treatments up to 200 MPa with inlet temperatures at 4–40°C. After HPH at 200 MPa with the inlet temperature at 40°C, the count of E. coli suspended in PBS, milk and apple juice reduced by 3·42, 3·67 and 3·19 log 10 CFU per ml respectively while the count of S. aureus decreased by 2·21, 1·02 and 2·33 log 10 CFU per ml respectively suggesting that S. aureus was more resistant. The inactivation data were well fitted by the polynomial equation. Milk could provide a protective effect for S. aureus against HPH. After HPH at 200 MPa with the inlet temperature at 20°C, the cell structure of E. coli was destroyed, while no obvious damages were found for S. aureus .