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

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KARACA B., Buzrul S., ÇÖLERİ CİHAN A.

FOOD SCIENCE OF ANIMAL RESOURCES, cilt.41, sa.2, ss.288-299, 2021 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 41 Sayı: 2
  • Basım Tarihi: 2021
  • Doi Numarası: 10.5851/kosfa.2020.e100
  • Dergi Adı: FOOD SCIENCE OF ANIMAL RESOURCES
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.288-299
  • Anahtar Kelimeler: Anoxybacillus, dairy industry, Geobacillus, predictive microbiology, thermophilic bacteria, THERMOPHILIC SPORE-FORMERS, BACTERIAL-GROWTH, PSEUDOMONAS-AERUGINOSA, BACILLI, RESISTANCE
  • Ankara Üniversitesi Adresli: Evet

Özet

Biofilm formation of Geobacillus thermodenitrificans, Geobacillus thermoglucosidans and Anoxybacillus flavithermus in milk on stainless steel were monitored at 55 degrees C, 60 degrees C, and 65 degrees 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 degrees C for both Geobacillus and Anoxybacillus. However, the biofilm formation rates indicated that the lowest rates of formation were obtained at 60 degrees C for Geobacillus. Moreover, biofilm formation rates of G. thermodenitrificans (1.2-1.6 Log(10)CFU/mL.h) were higher than G. thermoglucosidans (0.4-0.7 Log(10)CFU/mL.h). Although A. flavithermus had the highest formation rate values (2.7-3.6 Log(10)CFU/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.