Use of logistic regression with dummy variables for modeling the growth-no growth limits of Saccharomyces cerevisiae IGAL01 as a function of sodium chloride, acid type, and potassium sorbate concentration according to growth media

• Published in: Journal of food protection 2007-02, Vol.70 (2), p.456-465
• Main Authors: ARROYO LOPEZ, F. N, DURAN QUINTANA, M. C, GARRIDO FERNANDEZ, A
• Format: Article
• Language: English
• Subjects: Biological and medical sciences; Culture Media - chemistry; Food Contamination - analysis; Food industries; Food Microbiology; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Kinetics; Logistic Models; Models, Biological; Olea - microbiology; Saccharomyces cerevisiae; Saccharomyces cerevisiae - drug effects; Saccharomyces cerevisiae - growth & development; Sodium Chloride - pharmacology; Sorbic Acid - pharmacology
• ISSN: 0362-028X; 1944-9097
• DOI: 10.4315/0362-028X-70.2.456

A global logistic model was used to study the effects of both quantitative variables (NaCl, acid, and potassium sorbate concentrations) and dummy variables (laboratory medium or brine, and citric, lactic, or acetic acids) on growth of Saccharomyces cerevisiae IGAL01. The deduced equations, with the significant coefficients selected by a backward stepwise procedure, allowed estimations of the simultaneous comparison of behaviors of levels of the qualitative variables as a function of the quantitative variables and the development of the growth-no growth limits according to laboratory medium or brine and the different types of acidifying agents. The S. cerevisiae growth region in yeast malt glucose peptone broth was always wider than that in brine, in which this yeast was inhibited by 0.03% potassium sorbate and 6% NaCl, when the acid concentration (regardless of type) was 0.2 to 0.3%. These results demonstrate the applicability of such model designs to include qualitative variables in investigations related to the development of growth-no growth limits.