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Physicocehmical and rheological properties of a novel emulsifier, EPS-R, produced by the marine bacterium Hahella chejuensis

Cited 8 time in wos
Cited 12 time in scopus
Title
Physicocehmical and rheological properties of a novel emulsifier, EPS-R, produced by the marine bacterium Hahella chejuensis
Other Titles
하헬라 JeJu엔시스가 생산하는 신규 생물유화제 EPS=R의 물리화학적 특성 및 물성
Authors
Yim, Joung Han
Kim, Sung Jin
An, Se Hoon
Lee, Hong Kum
Keywords
Hahella chejuensisexopolysaccharidemarine bacteriumrheological properties
Issue Date
2004
Citation
Yim, Joung Han, et al. 2004. "Physicocehmical and rheological properties of a novel emulsifier, EPS-R, produced by the marine bacterium Hahella chejuensis". Biotechnology and Bioprocess Engineering, 9(5): 1.
Abstract
The rheological properties of an exopolysaccharide, EPS-R, produced by the marine bacterium Hahella chejuensis strain 96CJ10356 were investigated. The E24 of 0.5% EPS-R was 89.2%, which was higher than that observed in commercial polysaccharides such as xanthan gum (67.8%), gellan gum (2.01%) or sodium alginate (1.02%). Glucose and galactose are the main sugars in EPS-R, with a molar ratio of ~1:6.8, xylose and ribose are minor sugar components. The average molecular mass, as determined by gel filtration chromatography, was 2.2 x 103 KDa. The intrinsic viscosities of EPS-R were calculated to be 16.5 and 15.9 dl/g using the Huggins and Kraemer equations, respectively, with a 2.3 dl/g overlap. In terms of rigidity, the conformation of EPS-R was similar to that of caboxymethyl cellulose (5.0 x 10-2). The rheological behavior of EPS?R dispersion indicated that the formation of a structure intermediate between that of a random-coil polysaccharide and a weak gel. The aqueous dispersion of EPS-R at concentrations ranging from 0.25% to 1.0% (w/w) showed a marked shear-thinning property in accordance with Power-law behavior. In aqueous dispersions of 1.0% EPS-R, the consistency index (K) and flow behavior index (n) were 1,410 and 0.73, respectively. EPS-R was stable to pH and salts.
URI
https://repository.kopri.re.kr/handle/201206/6616
DOI
http://dx.doi.org/10.1007/BF02933066
Type
Article
Indexed
SCIE
Appears in Collections  
2004-2005, Application and Development of Biopolymer from Marine Microorganisms (04-05) / Lee, Hong Kum (PM27300, PM05050)
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