alexa Emulsifier of Arthrobacter RAG-1: chemical and physical properties.
Environmental Sciences

Environmental Sciences

Journal of Petroleum & Environmental Biotechnology

Author(s): Zuckerberg A, Diver A, Peeri Z, Gutnick DL, Rosenberg E

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Abstract The extracellular emulsifier of Arthrobacter RAG-1 was deproteinized by hot phenol treatment and purified by fractional precipitation with (NH(4))(2)SO(4). The active fraction, precipitating between 30 and 35\% saturation [EF-RAG(UET) WA], appeared to be homogeneous by immunodiffusion and sedimentation analysis. EF-RAG(UET) WA had an intrinsic viscosity of 750 cm(3)/g, a sedimentation constant of 6.06S, a diffusion constant of 5.25 x 10(-8) cm(2) s(-1), and a partial molar volume of 0.712 cm(3) g(-1). From these data a weight average molecular weight of 9.76 x 10(5) and a viscosity average molecular weight of 9.88 x 10(5) were calculated. EF-RAG(UET)WA contained 46.7\% C, 7.01\% H, and 6.06\% N. Titration of the nonreducing polymer gave a single inflection point (pK' = 3.05), corresponding to 1.5 mumol of carboxyl groups per mg. Direct estimation of O-ester and hexose content of the highly acidic polymer yielded 0.65 and 0.29 mumol/mg, respectively. Mild alkaline hydrolysis released fatty acids with an average molecular weight of about 231. Strong acid hydrolysis of EF-RAG(UET)WA yielded d-glucose (minor), d-galactosamine (major), and an unidentified amino uronic acid (major).
This article was published in Appl Environ Microbiol and referenced in Journal of Petroleum & Environmental Biotechnology

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