Fungal contamination of stored automobile-fuels in a tropical environment |
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Authors: | Rodríguez-Rodríguez Carlos E Rodríguez Evelyn Blanco Rigoberto Cordero Ivannia Segura Daniel |
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Institution: | Research Center in Tropical Diseases and Laboratory of Research in Anaerobic Bacteriology, Faculty of Microbiology, University of Costa Rica, 2060 San José, Costa Rica. carlos.rodriguezrodriguez@ucr.ac.cr |
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Abstract: | Because of the lack of reports, the base levels of microbial contamination on stored fuels are unknown in tropical regions and it is
unclear whether these levels have some influence on fuel quality parameters. Therefore, fungal quality in automobile fuels stored across
Costa Rican territory was evaluated during two years according to the standard ASTM D6974-04. For a total of 96 samples, counts and
identification of molds and yeasts were performed on regular gas, premium gas and diesel taken from the bottom and superior part of
the container tanks. The highest contamination was found on the bottom of the tanks, where an aqueous phase was usually identified,
showing populations over the ones present in the hydrocarbon itself (up to 108 CFU/L). Diesel was the most contaminated fuel (up to
107 CFU/L); however, an alteration on the physicochemical parameters was not observed in any kind of fuel. Seventy-five mold strains
were isolated, Penicillium sp. being the most common genus (45.8% of the samples), and ten yeast strains, from the genera Candida sp.
and Rhodotorula sp. Four of the yeasts were able to grow on diesel as the sole carbon source, at concentrations ranging from 0.5% to
25%. Increasing the frequency of tank cleaning, adding antimicrobial agents and monitoring microbial populations are recommended
strategies to improve microbial quality of stored fuels. |
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Keywords: | fuel microbial contamination biodegradation molds yeasts |
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