Resumen

OLIVEIRA, Brás H. de; S. FILHO, José Dias  y  LEAL, Paulo C.. Biotransformation of steviol derivatives by Aspergillus niger and Fusarium moniliforme. J. Braz. Chem. Soc. [online]. 2005, vol.16, n.2, pp. 210-213. ISSN 0103-5053.  http://dx.doi.org/10.1590/S0103-50532005000200013.

Steviol derivatives have been submitted to biotransformations by fungi. Methyl ent-11b,13-dihydroxy-15,16-epoxikauran-19-oate was hydroxylated at C-11 by Aspergillus niger, whereas ent-16b-hydroxybeyeran-19-oic acid was hydroxylated at C-6 and C-7 by Fusarium moniliforme. The hydroxylation at non-activated positions at the carbon skeleton is discussed in connection with the properties of important polyhydroxylated diterpenoids described in the literature.

Palabras llave : kaurene and beyerane diterpenes; steviol; biotransformation; Aspergillus niger; Fusarium moniliforme.