Artigo
Enhanced solubilization of iron and calcium phosphates by Aspergillus niger by the addition of alcohols
Fecha
2013-04-01Registro en:
Brazilian Archives of Biology and Technology. Brazilian Archives of Biology and Technology, v. 56, n. 2, p. 181-189, 2013.
1516-8913
10.1590/S1516-89132013000200003
S1516-89132013000200003
WOS:000319985800003
S1516-89132013000200003.pdf
Autor
Universidade Estadual Paulista (Unesp)
Resumen
The present study deals with the effect of increased concentrations of alcohols (methanol and ethanol) on the solubilization of FePO4 and CaHPO4 by Aspergillus niger. The efficiency of solubilization (ES) of inorganic phosphates, fungal growth, acid production and pH variation were determined. The concentrations of alcohols that most favored the solubilization of phosphates were 4% methanol and 3% ethanol. The ES of phosphates by the fungus in media containing methanol ranged from 11-96% and 0.4-87% for ethanol. The stimulation or inhibition of solubilization was dependent on greater or lesser fungus growth, acid production and decreased pH. These responses were supported by the correlation between the amount of phosphate dissolved and fungal growth (0.630** to 0.831**), the production of acids (0.529* to 0.989**) and a decrease in pH (-0.755** to -0.962**). Thus, the addition of alcohols facilitated insoluble phosphates dissolution during the fungus growth.