FOOD SCIENCE ›› 2020, Vol. 41 ›› Issue (1): 1-8.doi: 10.7506/spkx1002-6630-20181121-250

• Basic Research •     Next Articles

Effect of High Pressure Thermal Sterilization on Physiological Characteristics of Weissella viridescens

YU Longxia, WU Xiang, LI Xinfu, ZHANG Wangang, LI Cong, XU Baocai   

  1. (1. Jiangsu Collaborative Innovation Center of Meat Production and Processing, Quality and Safety Control, Key Laboratory of Meat Processing and Quality Control, Ministry of Education, College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, China; 2. State Key Laboratory of Meat Processing and Quality Control, Jiangsu Yurun Meat Foods Co. Ltd., Nanjing 211806, China; 3. School of Food and Biological Engineering, Hefei University of Technology, Hefei 230601, China)
  • Online:2020-01-15 Published:2020-01-19

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Abstract: To explore the killing effect of high pressure thermal sterilization (HPTS) on Weissella viridescens, the physiological properties, morphological characteristics and membrane permeability of bacterial cells treated by either ultra high pressure (UHP) (at 350 MPa and 25 ℃ for 10 min) or HPTS (at 350 MPa and 50 ℃ for 10 min) were evaluated. The results showed that after HPTS treatment total bacteria count was significantly (P < 0.05) lower than that after UHP treatment (5.71 versus 7.67 (lg(CFU/mL))). The synergistic treatment caused the surface of bacterial cells to become seriously wrinkled, caused denaturation and coagulation of cellular contents, and damaged the cell membrane thereby altering membrane permeability and resulting in a significant increase in extracellular ultraviolet (UV)-absorbing substances (P < 0.05). In summary, HPTS could aggravate deformation of bacterial cells and increase cell membrane permeability leading to leakage of intracellular UV-absorbing substances. The results of this study provide theoretical evidence for the mechanisms of Weissella viridescens inactivation by HPTS.

Key words: high pressure thermal sterilization, Weissella viridescens, cell membrane damage

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