Production of gamma-lactones by the brown-rot basidiomycete Piptoporus soloniensis.
A wild strain of brown-rot basidiomycete Piptoporus soloniensis produced a sweet flavor similar to tropical fruits in liquid cultures. The major and minor compounds were identified to be gamma-decalactone and gamma-octanolactone by gas chromatography-mass spectrometry analysis, respectively. The growth and production of gamma-decalactone by P. soloniensis in broth to which fatty acids had been added were investigated. The addition of 12-hydroxystearic acid and ricinoleic acid to the culture markedly enhanced the production of gamma-decalactone. On the other hand, addition of myristic acid, palmitic acid, stearic acid and oleic acid to the culture resulted in a higher production of gamma-octanolactone. The addition of hexanoic acid, octanoic acid, decanoic acid, lauric acid, linoleic acid and linolenic acid to the culture reduced the growth of P. soloniensis and production of gamma-decalactone and gamma-octanolactone. This strain accumulated oxalic acid in liquid culture and grew sufficiently under strongly acidic conditions.
Okamoto
Kenji
K
Department of Biotechnology, Faculty of Engineering, Tottori University, 4-101 Koyama-cho Minami, Tottori 680-8552, Japan. okamoto@bio.tottori-u.ac.jp
Chimori
Mieko
M
Iwanaga
Fumi
F
Hattori
Tsutomu
T
Yanase
Hideshi
H