Produção de biosurfactantes por cepas bacterianas cultivadas em corantes sinteticos / Production of bacterial biosurfactantes for cepas cultivated in sinteticos corantes

AUTOR(ES)
DATA DE PUBLICAÇÃO

2003

RESUMO

Worldwide at the present time synthetic dyes have been frequently employed by the industry to provide commercial products more acceptable to people. On the other hand, a great part of these dyes have been deposited in the environment, mainly through eff1uent discharges into water courses, resulting in growing pollution problems. There does not exist an ideal method that can be used to treat eff1uents containing synthetic dyes, but biological methods have been frequently proposed, probably due to their advantages in relation to the traditional methods, such as low costs. Biosurfactants are substances with both hydrophylic and lipophylic character, produced by microrganisms growing on different carbon sources. There is not sufficient information about the reason why microrganisms synthetise biosurfactants, but one of them relates to the solubilization of insoluble substracts. The present work shows bacterial emulsification activities and the different types of biosurfactant activities that these microrganisms can produce. The ability of some strains to remove the dyes color was evaluated. The C 50 (that was identified as Bacillus subtilis) and A 50 (not identified) cepas can produce biosurfactant (+4 compactation leveI) in artificial and U (for tartrazin-containing medium) and 0,27 U (for erioglaucine-containing medium). ln presence of xileno, the emulsification activity during the growth of the A 50 and C 50 strains was 0,39 U (for orange G-containing medium) and 0,45 U (for erioglaucine-containing medium)

ASSUNTO(S)

corantes agentes ativos de superficies active agents of superficies corantes meio ambiente - poluição environment

ACESSO AO ARTIGO

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