Inactivation of Bacillus subtilis spores by high pressure CO2 with high temperature

文献类型： 外文期刊

第一作者： Rao, Lei

作者： Rao, Lei;Wang, Yongtao;Zhao, Feng;Hu, Xiaosong;Liao, Xiaojun;Xu, Zhenzhen

作者机构：

关键词： High pressure CO2;Bacillus subtilis;Spore;Inactivation kinetics;Clumping;Protective effect

期刊名称：INTERNATIONAL JOURNAL OF FOOD MICROBIOLOGY （ 影响因子：5.277； 五年影响因子：5.388 ）

ISSN：

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收录情况： SCI

摘要： The objective of this study was to investigate the inactivation of the Bacillus subtilis spores by high pressure CO2 combined with high temperature (HPCD + HT) and to analyze the clumping effect of the spores on their HPCD + HT resistance. The spores of B. subtilis were subjected to heat at 0.1 MPa and HPCD at 6.5-25 MPa, and 82 degrees C, 86 degrees C, and 91 degrees C for 0-120 min. The spores were effectively inactivated by HPCD + FIT, but a protective effect on the spores was also found, which was closely correlated to the pressure, temperature and time. The spores treated by HPCD + HT at 6.5 and 10 MPa exhibited a two-stage inactivation curve of shoulder and log-linear regions whereas the spores at 15-25 MPa exhibited a three-stage inactivation curve of shoulder, log-linear and tailing regions, and these curves were well fitted to the Geeraerd model. Approximately 90% of pyridine-2,6-dicarboxylic acid (DPA) was released after HPCD + HT and the 90% DPA release time depend on the pressure and temperature. Moreover, the spore clumping in suspensions was examined by dynamic light scattering. The particle size of the spore suspensions increased with the increase of pressure, temperature and time, indicating the spore clumping. 0.1% Tween 80 as a surfactant inhibited the spore clumping and increased the inactivation ratio of the spores by HPCD + FIT. These results indicated that the spore clumping enhanced the spores' resistance to HPCD + HT and induced a protective effect. (C) 2015 Elsevier B.V. All rights reserved.

分类号： TS201.3

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