NDLI: Bioemulsifier production by Aspergillus niger MYA 135: presumptive role of iron and phosphate on emulsifying ability

Content Provider	Springer Nature Link
Author	Colin, Verónica Leticia Baigorí, Mario Domingo Pera, Licia María
Copyright Year	2010
Abstract	Microbial emulsifiers are compounds employed in primary mechanisms for bioremediation of petroleum and other hydrocarbon pollutants from the environment. Although emulsifiers of biological origin are produced by microorganisms generally in response to growth on hydrocarbons, Aspergillus niger MYA 135 produced a bioemulsifier during fermentation in a sucrose-based culture medium at an initial pH of 5.0 and at 30°C. The production of bioemulsifiers can be strongly influenced by environmental factors. In this connection, a study of the effect of initial pH, the incubation temperature and presence of CaCl$_{2}$ or FeCl$_{3}$ in the culture medium was conducted. Emulsification index was increased by 112 and 206% at an initial pH 2.0 or in medium supplemented with FeCl$_{3}$, respectively. On the other hand, emulsifying ability of Aspergillus niger supernatants was detected during the exponential phase, suggesting that bioemulsifiers accumulation and microbial growth would be related. Interestingly, this study suggests that iron and/or phosphate ions would play a key role in maintaining the emulsifying ability. Finally, factorial design was also employed to study the effects of the initial pH, the presence of FeCl$_{3}$ and the concentration of KH$_{2}$PO$_{4}$ on the emulsification index.
Starting Page	2291
Ending Page	2295
Page Count	5
File Format	PDF
ISSN	09593993
Journal	World Journal of Microbiology and Biotechnology
Volume Number	26
Issue Number	12
e-ISSN	15730972
Language	English
Publisher	Springer Netherlands
Publisher Date	2010-04-17
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Aspergillus niger Bioemulsifier accumulation Emulsification index Factorial design Biochemistry Biotechnology Microbiology Environmental Engineering/Biotechnology Applied Microbiology
Content Type	Text
Resource Type	Article
Subject	Physiology Medicine Applied Microbiology and Biotechnology Biotechnology

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