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Bol. micol ; 21: 35-41, dic. 2006. tab, graf
Article in Spanish | LILACS | ID: lil-476908

ABSTRACT

Desde suelos de la XII Región de Chile contaminados y no contaminados con petróleo crudo, se aislaron un total de 240 cepas fúngicas agrupadas en 15 géneros y un micelio estéril, que mayoritariamente correspondieron a los géneros Penicillium (130), Absidia (32) y Mortierella (29). Por su capacidad de crecimiento y mayor peso seco micelial en agar y caldo mineral adicionado de petróleo crudo al 1 por ciento, se seleccionaron las cepas Dd202, Dd219 de Mortierella spp. y Dd225 de Penicillium sp., para determinar su cinética degradativa a lo largo del tiempo ( 9, 18 y 36 días). Utilizando espectrofotometría infrarroja se determinaron las fracciones del petróleo que fueron degradadas por las 3 cepas, que correspondieron a fracciones cuyas frecuencias se encuentran entre 2850 y 1800 cm-1 (aldehídos, alquinos y anhídridos) y entre 1510 y 1000 cm-1 (alcanos saturados e insaturados, aromáticos y alquilos).


A total of 240 fungal strains grouped in 15 generaand a sterile mycelium which corresponded mostly togenera Penicillium (130), Absidia (32) and Mortierella(29) were isolated from soils of the XII Region of Chilethat had been polluted or not with raw petroleum. StrainsDd202, Dd219 of Mortierella spp. and Dd225 of Penicilliumsp. were selected because of their ability of growthand major mycelial dry weight in agar and mineral brothadded with 1 percent raw petroleum in order to determine theirdegradative kinetics with time (9,18 and 36 day). By meansof infrared spectrophotometry, fractions of petroleum thathad been degraded by the three strains could beestablished , the frequencies of which being between 2850and 1800cm-1(aldehyde,alkine and anhydride) andbetween 1510 and 1000 cm-1 (saturated and insaturatedalkane, aromatic and alkyle).


Subject(s)
Biodegradation, Environmental , Fungi/isolation & purification , Fungi/classification , Fungi/pathogenicity , Petroleum , Soil Pollutants , Chile
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