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Cold storage temperature following pulsed electric fields treatment to inactivate sublethally injured microorganisms and extend the shelf life of green tea infusions.
Int J Food Microbiol. 2009 Feb 15; 129(2):204-8.IJ

Abstract

In this work microbiological shelf life of green tea infusions processed by pulsed electric fields (PEF) treatment (38.4 kV/cm for 200 micros) were assessed at the three storage temperatures of 4, 25 and 37 degrees C, respectively. Immediately after PEF treatment, no viable bacterial cells were detected. However, significant recovery was observed during storage at 25 and 37 degrees C. The total aerobic microbial population increased rapidly in PEF-treated green tea infusions when stored at 25 and 37 degrees C for 14 and 7 days respectively. However, the microbial population remained under 1 log(10) CFU/ml when stored at 4 degrees C up to 180 days. These results demonstrated that a certain proportion of microbial cells in green tea infusions were sublethally injured by PEF treatment, and the recovery of apparently dead or 'intermediately damaged' cells could increase the detected number of surviving microorganisms. In the present study PEF-treated green tea infusions were placed at 4 degrees C for various time, and then stored at 37 degrees C. Cold storage (4 degrees C for 7 days) following PEF treatment was found to be effective to delay or inhibit the repair process of sublethally injured cells and extend the microbiological shelf life of PEF-treated green tea infusions to more than 90 days at 37 degrees C.

Authors+Show Affiliations

State Key Laboratory of Food Science & Technology and School of Food Science and Technology, Jiangnan University, No.1800, Lihu Road, Wuxi 214122, China.No affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19138809

Citation

Zhao, Wei, et al. "Cold Storage Temperature Following Pulsed Electric Fields Treatment to Inactivate Sublethally Injured Microorganisms and Extend the Shelf Life of Green Tea Infusions." International Journal of Food Microbiology, vol. 129, no. 2, 2009, pp. 204-8.
Zhao W, Yang R, Wang M. Cold storage temperature following pulsed electric fields treatment to inactivate sublethally injured microorganisms and extend the shelf life of green tea infusions. Int J Food Microbiol. 2009;129(2):204-8.
Zhao, W., Yang, R., & Wang, M. (2009). Cold storage temperature following pulsed electric fields treatment to inactivate sublethally injured microorganisms and extend the shelf life of green tea infusions. International Journal of Food Microbiology, 129(2), 204-8. https://doi.org/10.1016/j.ijfoodmicro.2008.12.006
Zhao W, Yang R, Wang M. Cold Storage Temperature Following Pulsed Electric Fields Treatment to Inactivate Sublethally Injured Microorganisms and Extend the Shelf Life of Green Tea Infusions. Int J Food Microbiol. 2009 Feb 15;129(2):204-8. PubMed PMID: 19138809.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Cold storage temperature following pulsed electric fields treatment to inactivate sublethally injured microorganisms and extend the shelf life of green tea infusions. AU - Zhao,Wei, AU - Yang,Ruijin, AU - Wang,Mo, Y1 - 2008/12/10/ PY - 2008/05/19/received PY - 2008/11/23/revised PY - 2008/12/02/accepted PY - 2009/1/14/entrez PY - 2009/1/14/pubmed PY - 2009/5/19/medline SP - 204 EP - 8 JF - International journal of food microbiology JO - Int J Food Microbiol VL - 129 IS - 2 N2 - In this work microbiological shelf life of green tea infusions processed by pulsed electric fields (PEF) treatment (38.4 kV/cm for 200 micros) were assessed at the three storage temperatures of 4, 25 and 37 degrees C, respectively. Immediately after PEF treatment, no viable bacterial cells were detected. However, significant recovery was observed during storage at 25 and 37 degrees C. The total aerobic microbial population increased rapidly in PEF-treated green tea infusions when stored at 25 and 37 degrees C for 14 and 7 days respectively. However, the microbial population remained under 1 log(10) CFU/ml when stored at 4 degrees C up to 180 days. These results demonstrated that a certain proportion of microbial cells in green tea infusions were sublethally injured by PEF treatment, and the recovery of apparently dead or 'intermediately damaged' cells could increase the detected number of surviving microorganisms. In the present study PEF-treated green tea infusions were placed at 4 degrees C for various time, and then stored at 37 degrees C. Cold storage (4 degrees C for 7 days) following PEF treatment was found to be effective to delay or inhibit the repair process of sublethally injured cells and extend the microbiological shelf life of PEF-treated green tea infusions to more than 90 days at 37 degrees C. SN - 1879-3460 UR - https://www.unboundmedicine.com/medline/citation/19138809/Cold_storage_temperature_following_pulsed_electric_fields_treatment_to_inactivate_sublethally_injured_microorganisms_and_extend_the_shelf_life_of_green_tea_infusions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0168-1605(08)00626-0 DB - PRIME DP - Unbound Medicine ER -