60160-17-0Relevant articles and documents
Specific enzyme-catalyzed hydrolysis and synthesis in aqueous and organic medium using biocatalysts with lipase activity from Aspergillus niger MYA 135
Romero, Cintia M.,Pera, Licia M.,Loto, Flavia,Baigori, Mario D.
, p. 1361 - 1368 (2013/01/15)
In the present study, the specific hydrolytic activity of three biocatalysts such as the constitutive mycelium-bound lipase, the induced mycelium-bound lipase and the lyophilized induced supernatant from A. niger MYA 135 was evaluated in both aqueous and organic media.A direct correlation between activity in water and n-hexane was not observed for the same hydrolytic reaction. The n-hexane/water activity ratio (RO/A) was applied to characterize the activity in organic medium. The three biocatalysts showed RO/A values higher than 1 for hydrolysis of long-chain fatty acid esters, demonstrating a higher specific hydrolytic activity in organic solvent than in water. A different behavior was observed during hydrolysis of middle-chain fatty acid esters, which was higher in aqueous medium (R O/Adw) observed in a reaction mixture containing propanol and p-nitrophenyl laurate. Finally, both p-nitrophenyl caprate (C10) and p-nitrophenyl laurate (C12) were preferentially methanolized by the lyophilized induced supernatant, being this lipase activity the most specific biocatalyst preparation under transesterification conditions. A selectivity-based analysis of each lipase preparation toward transesterification or hydrolysis in organic medium was evaluated as well. Springer Science+Business Media, LLC 2012.
ESSENTIAL OIL PRODUCED BY CHRYSOSPORIUM XEROPHILUM IN COCONUT
Kinderlerer, Judith L.,Hatton, Paul V.,Chapman, Amanda J.,Rose, Malcolm E.
, p. 2761 - 2764 (2007/10/02)
An essential oil (0.3percent v/w) was produced after fermentation of coconut for nine months by Chrysosporium xerophilum.Sixty per cent of the volatiles were aliphatic methyl ketones (C5-C13), esters and secondary alcohols whilst 38percent were present as free medium chain length fatty acids (C6-C12).A new class of ester, 2-heptyl esters of C8, C10 and C12 fatty acids, was identified by GC-MS and confirmed by synthesis.It is suggested that ester formation, ketone formation and alkane synthesis are mechanisms for removing medium chain fatty acids (C6-C12) which, if allowed to accumulate in the substrate, would be toxic to the fungus.Key Word Index - Cocos nucifera; Palmae; Chrysosporium xerophilum; fungus; substrate conversion coconut; methyl ketones; 2-heptyl esters; detoxification.