Influence of temperature on the surface growth of Geotrichum candidum

Hudecová, Anna, Valík, Ľubomír and Liptáková, Denisa Influence of temperature on the surface growth of Geotrichum candidum Acta Chimica Slovaca, Vol.2, No. 2, 2009, 75-87

Document type: Článok z časopisu / Journal Article
Collection: Acta Chimica Slovaca  
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Author(s) Hudecová, Anna
Valík, Ľubomír
Liptáková, Denisa
Title Influence of temperature on the surface growth of Geotrichum candidum
Journal name Acta Chimica Slovaca
Publication date 2009
Year available 2009
Volume number 2
Issue number 2
ISSN 1337-978X
Start page 75
End page 87
Total pages 13
Place of publication Bratislava
Publisher Slovak Technical University
Collection year 2009
Language english
Subject 290000 Engineering and Technology
290100 Industrial Biotechnology and Food Sciences
Abstract/Summary Growth of filamentous fungus G. candidum was analysed on the surface of skim milk agar as a function of incubation temperature (5 – 37 °C). Radial growth rates of fungus were estimated using growth model of Baranyi which describes the colony diameter as a function of cultivation time. Both Ratkowsky and transformation of G-model were used as secondary models in order to describe the effect of temperature on the radial growth rate of the fungus. Both models proved to be good predictors of G. candidum surface growth within experimental conditions. The bias and accuracy factors were 1.007 and 1.109 for Ratkowsky model and 1.000 and 1.177 for transformed G-model. In presented work also t3 model was proposed which allows the calculation of time needed to reach a colony diameter of 3 mm. This time is important mainly for the practical reasons because such colony would be visible and growth of fungus would be considered as spoilage in specific types of milk products. Due to ubiquitous nature of the fungus and because of its ability to grow at refrigerator temperatures the quantitative results are valuable in respect to the prevention of food spoilage.
Keyword(s) Geotrichum candidum
microbial modelling
radial growth rate
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