Changes in hydrocarbon emulsification specificity of the polymeric bioemulsifier emulsan: effects of alkanols
| Autor: | Zosim Zinaida, David L. Gutnick, Eugene Rosenberg |
|---|---|
| Rok vydání: | 1986 |
| Předmět: |
chemistry.chemical_classification
Diethanolamine Chromatography Aqueous solution Polymers and Plastics Hexadecane engineering.material chemistry.chemical_compound Colloid and Surface Chemistry Hydrocarbon chemistry Materials Chemistry engineering Phenethyl alcohol Organic chemistry Dodecanol Biopolymer Physical and Theoretical Chemistry Hexanol |
| Zdroj: | Colloid & Polymer Science. 264:218-223 |
| ISSN: | 1435-1536 0303-402X |
| DOI: | 10.1007/bf01414956 |
| Popis: | The biopolymer emulsan, which forms stable emulsions with mixtures of aliphatic and cyclic (or aromatic) hydrocarbons in water, does not emulsify aliphatic hydrocarbons alone [1–4]. Monohydric primary alcohols from hexanol to dodecanol were shown to enhance the formation of pure aliphatic hydrocarbon/water emulsions under conditions of mild agitation. Enhancement was a function of emulsan concentration and was proportional to alkanol concentration (5×10−5 M to 2.5x10−4 M) at constant bioemulsifier concentration (0.05 mg/ml). Enhancement of emulsification was also found when aqueous solutions of diethanolamine and phenethyl alcohol (5 to 30×10−3 M) were substituted for the primary alcohols. None of these substances emulsified hexadecane or othern-alkanes in the absence of the biopolymer. The strongest enhancement of emulsification (3-fold) was observed with tetra- and hexadecane. At alkanol concentrations optimal for enhancement of emulsification, no significant lowering of hexadecane/ emulsan/water interfacial tension was observed. The possibility of a direct association of alkanols with the emulsan in solution, resulting in altered conformation of biopolymer and modification of its specificity toward hydrocarbons, is discussed. |
| Databáze: | OpenAIRE |
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