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A predictive model based on the Box–Behnken design was developed to determine the effect of high hydrostatic pressure (HHP), temperature, and cycles (each holding time of 10 min) on the inactivation of  Aspergillus niger  spores and in the droplet size of a model emulsion. The obtained model presented goodness of fit to the data with a high correlation coefficient ( R 2 = 0.91) and adjusted correlation coefficient value (0.88), with no significant lack-of-fit test ( p  = 0.6031). The canonical analysis provides the conditions (37.29 °C, 263.33 MPa, and, 1.88 cycles) to reduce 5.0 Log 10  CFU/mL of  A. nigger . Under such conditions, emulsions exhibited a monomodal distribution of droplet size. However, as temperature and pressure increased, both the PDI, D 3,2 , and D 4,3  values increased ( p  ≤ 0.05). In conclusion, the proposed model has the potential to predict the reduction of  A. niger  spores by HHP without causing emulsion destabilization.

high pressure research

Modeling the inactivation of  Aspergillus niger  spores in a model parenteral emulsion by high hydrostatic pressure and its effect on the emulsion droplet size