Abstract:
:The oil-degrading Arthrobacter sp. RAG-1 produced an extracellular nondialyzable emulsifying agent when grown on hexadecane, ethanol, or acetate medium. The emulsifier was prepared by two procedures: (i) heptane extraction of the cell-free culture medium and (ii) precipitation with ammonium sulfate. A convenient assay was developed for measurement of emulsifier concentrations between 3 and 75 micrograms/ml. The rate of emulsion fromation was proportional to both hydrocarbon and emulsifier concentrations. Above pH 6, activity was dependent upon divalent cations; half-maximum activity was obtained in the presence of 1.5 mM Mg2+. With a ratio of gas oil to emulsifier of 50, stable emulsions were formed with average droplet sizes of less than 1 micron. Emulsifier production was parallel to growth on either hydrocarbon or nonhydrocarbon substrates during the exponential phase; however, production continued after growth ceased.
journal_name
Appl Environ Microbioljournal_title
Applied and environmental microbiologyauthors
Rosenberg E,Zuckerberg A,Rubinovitz C,Gutnick DLdoi
10.1128/AEM.37.3.402-408.1979subject
Has Abstractpub_date
1979-03-01 00:00:00pages
402-8issue
3eissn
0099-2240issn
1098-5336journal_volume
37pub_type
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