title: An attempt to optimize potassium sorbate use to preserve low pH (4.5-5.5) intermediate moisture bakery products by modelling Eurotium spp., Aspergillus spp. and Penicillium corylophilum growth.
abstract: Mould growth was modelled on fermented bakery product analogues (FBPA) of two different pH (4.5 and 5.5), different water activity (a(w)) levels (0.80-0.90) and potassium sorbate concentrations (0-0.3%) by using seven moulds commonly causing spoilage of bakery products (Eurotium spp., Aspergillus spp. and Penicillium corylophilum). For the description of fungal growth (growth rates) as a function of a(w), potassium sorbate concentration and pH, 10-terms polynomial models were developed. Modelling enables prediction of spoilage during storage as a function of the factors affecting fungal growth. At pH 4.5 the concentration of potassium sorbate could be reduced to some extent only at low levels of a(w), whereas at pH 5.5 fungal growth was observed even by adding 0.3% of potassium sorbate. However, this preservative could be a valuable alternative as antifungal in such bakery product, of slightly acidic pH, if a long shelf life has not to be achieved.
authors.affiliation: Food Technology Department, Lleida University, UTPV-CeRTA, Rovira Roure 191, 25198, Lleida, Spain.
authors.forename: M Elena
authors.initials: ME
authors.lastname: Guynot
authors.forename: Sonia
authors.initials: S
authors.lastname: Marín
authors.forename: Vicente
authors.initials: V
authors.lastname: Sanchis
authors.forename: Antonio J
authors.initials: AJ
authors.lastname: Ramos
mesh_terms: D001230:Aspergillus / Q000187:drug effects / Q000254:growth & development*; D001939:Bread / Q000382:microbiology*; D015169:Colony Count, Microbial; D004305:Dose-Response Relationship, Drug; D032641:Eurotiales / Q000187:drug effects / Q000254:growth & development*; D005511:Food Handling / Q000379:methods; D005516:Food Microbiology; D005519:Food Preservation / Q000379:methods*; D005520:Food Preservatives / Q000494:pharmacology*; D006863:Hydrogen-Ion Concentration; D008954:Models, Biological; D010407:Penicillium / Q000187:drug effects / Q000254:growth & development*; D013011:Sorbic Acid / Q000494:pharmacology*; D014867:Water / Q000378:metabolism
chemical_list: D005520:Food Preservatives; D014867:Water; D013011:Sorbic Acid