Effects of carbohydrate sources on biosorption properties of the novel exopolysaccharides produced by Arthrobacter ps-5.
Carbohydr Polym
; 112: 615-21, 2014 Nov 04.
Article
em En
| MEDLINE
| ID: mdl-25129790
ABSTRACT
The crude exopolysaccharides (EPSs) were obtained from Arthrobacter ps-5 fermentation using various carbohydrate sources followed by centrifugation, ethanol precipitation, and the isolated EPSs were further deproteinized and lyophilized. Carbohydrates from various sources resulted in different yield of EPSs from the fermentation and different molecular weight of EPSs. A maximum yield of 0.27 mg/g was achieved by using the culture medium supplemented with sucrose. The EPS produced by glucose-supplemented medium had the maximum content of acidic polysaccharides, subsequently presented the highest biosorption capacity for Cu(2+) and Pb(2+) at 257.9 mg/g and 331.8 mg/g, respectively. The ratio of acidic to neutral polysaccharides presented in EPSs was a key factor to explicate the biosorption mechanism, the higher the ratio, the stronger the biosorption capacity.
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Base de dados:
MEDLINE
Assunto principal:
Polissacarídeos Bacterianos
/
Arthrobacter
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article