Abstract:
The objective of this research was to study the effect of acylating agents; ethanol and acetaldehyde,on the production of 2-acetyl-l-pyrroline (ACPY) by Acremonium nigricans. The experiments werecarried out by adding 1, 2, 3,4 and 5% of ethanol and 0.05 and 0.1% of acetaldehyde into Syn18medium at the beginning of the incubation. The cultures conditions were set up at 28?C, pH 5.5,160 rpm with spore concentration at 2.5x109 sporesll of the medium. The results showed that theaddition of 1 and 2% of ethanol enhanced ACPY production 28% and 34% more than that of thecultivation without ethanol. ACPY was increased about 11% when 500 mg/l of acetaldehyde wasadded. However, the addition of ethanol at 3, 4 and 5% and acetaldehyde at 1000 mg/l lowerthe ACPY production. The addition of ethanol at 2% at 1 day and 2 days after incubation showedhigher ACPY concentration than the cultivation in Syn18 medium, 19% and 26%, respectively.N-acetylpyrrolidone (N-AP) were detected in the fermentation liquid after the production of ACPY.The formation pattern of N-AP in the incubation of A. nigricans with 1, 2 and 3% ethanol wasdifferent from that without ethanol addition. No N-AP was detected in the cultivation with 4and 5% ethanol and 0.05 and 0.1% acetaldehyde.