Temperature influence on Penicillium citrinum Thom growth and citrinin accumulation kinetics |
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| Affiliation: | 1. Department of Microbiology, CHU La Reunion, St Pierre, France;2. UMR PIMIT « processus infectieux en milieu insulaire tropical », Inserm 1187, CNRS 9192, IRD 249, université de La Réunion, CYROI, 97490 Sainte-Clotilde, Reunion;3. University of Brest, GEIHP EA, 3142, Brest, France;4. Department of Hematology and Medical Oncology, CHU La Reunion, St Pierre, France;5. Department of Infectious Diseases, CHU La Reunion, St Pierre, France;6. Intensive Care Unit, CHU La Reunion, St Pierre, France;1. College of Veterinary Medicine, Agricultural University of Hebei, Baoding, Hebei 071001, China;2. Center of Inspection and Quarantine Technology, Hebei Entry-Exit Inspection and Quarantine Bureau, Shi Jiazhuang, Hebei 050051,China;3. Hebei Academy of Science and Technology for Inspection and Quarantine, Shijiazhuang 050051, China;4. Hebei Animal Disease Control Center, Shijiazhuang 050050, China |
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| Abstract: | To study the temperature influence on both Penicillium citrinum growth and citrinin accumulation, a strain isolated from corn was cultured on Czapek agar with maize extract at 15, 20, 25 and 30 °C. Radial growth rate and lag phase were determined from the increase in colony diameter with time. The optimal temperature for P. citrinum growth was 30°C. Citrinin extracted from the agar medium was determined by thin layer chromatography. Citrinin accumulation kinetics were analyzed by fitting the data to curves generated by using a logistic function. The parameters obtained from this equation demonstrated, for all temperatures studied, that the maximum citrinin accumulation by P. citrinum on Czapek agar with maize extract was at about 30°C. At 37°C a rapid decrease in the citrinin concentration was observed after a maximal value was reached. |
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