Study on synergistic effects of slightly acidic electrolyzed water and ultra-high pressure parallel on Escherichia coli on the surface of Panax notoginseng tubers
Objective To delve into the influences of slightly acidic electrolyzed water(SAEW)and ultra-high pressure(UHP)on the bactericidal potency of Panax notoginseng tubers,and quantification of synergistic bactericidal effect,constructing bactericidal model.Methods Fresh Panax notoginseng was selected as the raw material,with independent variables encompassing SAEW available chlorine concentrations(25,30,35 mg/L),solid-liquid ratios(1:20,1:30,1:40 g/mL),treatment durations(4,6,8 min),and pressures(200,300,400 MPa).The number of deceased Escherichia coli on the surface of Panax notoginseng tubers was set as the response value.A response surface methodology was adopted to optimize these treatment parameters and establish a coordination range for parallel SAEW-UHP treatments while quantifying their synergistic effects,verified the prediction accuracy of the model.Results Revealed that based on single-factor experiments,SAEW-UHP parallel technology was better than single technology in bactericidal effect,the optimal sterilization process parameters for the SAEW-UHP parallel technology lie within a solid-liquid ratio range of 1:26.90-1:33.34 g/mL,available chlorine concentrations range of 29.03-35.00 mg/L,treatment durations range of 5.27-6.83 min,pressure range of 295.57-400.00 MPa and the material-to-liquid ratio was set at 1:31.28 g/mL,with an electrolyzed water concentration was set at 34.25 mg/L,treatment duration was set at 6.79 min,and the pressure was set at 400.00 MPa,the synergistic effect predicted by the model reached its maximum,yielding a peak quantification value of 1.87 lg(CFU/mL).Conclusion This research quantitatively elucidates the augmented sterilization efficacy conferred by the SAEW-UHP parallel technology,utilized the smallest dosage and the lowest processing intensity to achieve the best bactericidal effect,which furnishing a theoretical underpinning for fresh produce storage strategies,offering novel approaches to green processing,and providing a guarantee for food microbial safety.
万方数据
维普
