Optimum sterilization: a comparative study between average and surface quality

C. L. M. Silva, F. A. R. Oliveira*, P. A. M. Pereira, M. Hendrickx

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)


Sterilization temperatures to maximize volume average or surface quality retention were calculated for one‐dimensional conduction heating foods as a function of (1) Food Properties, (2) Processing Conditions and (3) Processing Criteria. A target lethality at the least‐lethality point was used as a constraint, and optimal temperatures were qualitatively and quantitatively compared for equal design variables. Average quality optimum conditions depend linearly on the inverse square of the Drefq‐value for the quality factor. These conditions do not vary linearly with all the other influential variables, opposite to what had been observed for surface quality. Optimum temperature for maximum average quality is always higher than the corresponding one for surface quality, but the difference is not constant. A systematic approach to the dependence of average quality optimal conditions on all the relevant parameters was carried out and quantitative relations were obtained. Optimum average quality retention is independent of surface heat transfer resistance.

Original languageEnglish
Pages (from-to)155-176
Number of pages22
JournalJournal of Food Process Engineering
Issue number2
Publication statusPublished - May 1994


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