NDLI: Co-loaded proteinase K/thyme oil liposomes for inactivation of <i>Escherichia coli</i> O157:H7 biofilms on cucumber

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Food & Function Vol - 7 Issue - 8

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Co-loaded proteinase K/thyme oil liposomes for inactivation of Escherichia coli O157:H7 biofilms on cucumber

Content Provider	Royal Society of Chemistry (RSC)
Author	Lin, Lin Ma, Cuixia Cui, Haiying
Copyright Year	2016
Abstract	E. coli O157:H7 is a bacterium frequently found on vegetable surfaces, such as cucumber, that can pose a significant threat to consumers. In the present work, proteinase K (PK) and thyme oil (TO) were used to inactivate E. coli O157:H7 biofilms. Both PK and TO were encapsulated in liposomes to improve their chemical stability and to allow for a controlled release. The optimal PK/TO-loaded liposomes (particle size of 170.4 nm, polydispersity index of 0.309, zeta potential of −29.8 mV and entrapment efficiency of 33.2%) were engineered. The antibacterial activities of the PK/TO liposomes against E. coli O157:H7 biofilms in vitro and on the cucumber were observed. Compared to free PK, free TO, and free PK/TO and TO liposome treatments, PK/TO-liposomes exhibited a higher antibiofilm activity and longer action duration. Specifically, the counts of viable E. coli O157:H7 on cucumbers were reduced by 1.23, 2.32 and 2.44 Logs after treatment with 400 mg mL−1 of PK/TO liposomes for 3 d, at 5, 15 and 25 °C, respectively. Colorimetric analysis and sensory tests showed that the PK/TO-liposome treatment had almost no impact on food quality after 1 d.
Starting Page	4030
Ending Page	4040
Page Count	11
File Format	HTM / HTML PDF
ISSN	20426496
Volume Number	7
Issue Number	9
Journal	Food & Function
DOI	10.1039/c6fo01201a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Escherichia coli Cucumber Proteinase K Thyme Dispersity Zeta potential Liposome Colorimetric analysis
Content Type	Text
Resource Type	Article
Subject	Medicine Food Science

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Co-loaded proteinase K/thyme oil liposomes for inactivation of Escherichia coli O157:H7 biofilms on cucumber

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Co-loaded proteinase K/thyme oil liposomes for inactivation of Escherichia coli O157:H7 biofilms on cucumber