Staphylococcus aureus 2064 growth as affected by temperature and reduced water activity

Ital J Food Saf. 2019 Dec 5;8(4):8287. doi: 10.4081/ijfs.2019.8287.


Based on 247 growth data, the growth of S. aureus 2064 in dependence on temperatures (8-50°C) and aw values (0.999-0.83) was described. Optimal values of aw at all studied temperatures were determined by using Gibson model. Its compatibility was confirmed by several statistical indices, e.g. root mean square errors (RMSE 0.003-0.138), standard errors of prediction (%SEP 0.6-17.5). Cardinal values for S. aureus growth (Tmin =7.7°C, Topt =40.6°C, Tmax =46.7°C, awmin =0.808, awopt =0.994, μopt =1.97 1/h) were determined by using CM model with indices RMSE=0.071, SEP=17.5%. Our findings can provide relevant growth information that can be used in S. aureus exposure assessment or in validation of other data regarding the growth of this opportunistic pathogen in foods.

Keywords: Cardinal temperature; Salt addition; Secondary growth model.

Grant support

Funding: This work was funded by grants VEGA No. 1/0532/18.