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Chemically modified surface functional groups of Alcaligenes sp. S-XJ-1 to enhance its demulsifying capability.

Abstract：

:Cell-surface functional groups (amino, carboxyl, hydroxyl, as well as phosphate) were chemically modified in various ways to enhance the demulsification capability of the demulsifying bacteria Alcaligenes sp. S-XJ-1. Results demonstrated that the demulsifying activity was significantly inhibited by amino enrichment with cetyl trimethyl ammonium bromide, amino methylation, hydroxyl acetylation, and phosphate esterification, but was gradually promoted by carboxyl blocking with increasing the extents of esterification. Compared with the raw biomass, an optimal esterification of carboxyl moieties enhanced the demulsification ratio by 26.5% and shortened the emulsion half-life from 24 to 8.8 h. The demulsification boost was found to be dominated by strengthened hydrophobicity (from 53° to 74°) and weakened electronegativity (from -34.6 to -4.3 mV at pH 7.0) of the cell surface, allowing the rapid dispersion and adsorption of cells onto the oil-water interface. The chemical modification of the functional groups on the biomass surface is a promising tool for the creation of a high-performance bacterial demulsifier.

journal_name

Appl Microbiol Biotechnol

journal_title

Applied microbiology and biotechnology

authors

Zhang Y,Liu J,Huang X,Lu L,Peng K

doi

10.1007/s00253-017-8111-1

subject

Has Abstract

pub_date

2017-05-01 00:00:00

pages

3839-3848

issue

9

eissn

0175-7598

issn

1432-0614

pii

10.1007/s00253-017-8111-1

journal_volume

101

pub_type

杂志文章

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