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Mathematical Models for the Biofilm Formation of Geobacillus and Anoxybacillus on Stainless Steel Surface in Whole Milk.

Başar KaracaSencer BuzrulArzu Coleri Cihan
Published in: Food science of animal resources (2021)
Biofilm formation of Geobacillus thermodenitrificans, Geobacillus thermoglucosidans and Anoxybacillus flavithermus in milk on stainless steel were monitored at 55°C, 60°C, and 65°C for various incubation times. Although species of Geobacillus showed a rapid response and produced biofilm within 4 h on stainless steel, a delay (lag time) was observed for Anoxybacillus. A hyperbolic equation and a hyperbolic equation with lag could be used to describe the biofilm formation of Geobacillus and Anoxybacillus, respectively. The highest biofilm formation amount was obtained at 60°C for both Geobacillus and Anoxybacillus. However, the biofilm formation rates indicated that the lowest rates of formation were obtained at 60°C for Geobacillus. Moreover, biofilm formation rates of G. thermodenitrificans (1.2-1.6 Log10CFU/mL·h) were higher than G. thermoglucosidans (0.4-0.7 Log10CFU/mL·h). Although A. flavithermus had the highest formation rate values (2.7-3.6 Log10CFU/mL·h), this was attained after the lag period (4 or 5 h). This study revealed that modeling could be used to describe the biofilm formation of thermophilic bacilli in milk.
Keyphrases
  • biofilm formation
  • pseudomonas aeruginosa
  • staphylococcus aureus
  • candida albicans
  • escherichia coli
  • cystic fibrosis
  • gram negative
  • genetic diversity
  • sensitive detection