Arid
DOI10.1007/s10811-012-9791-7
Rheology and composition of a multi-utility exopolymer from a desert borne cyanobacterium Anabaena variabilis
Bhatnagar, M.1; Pareek, S.; Ganguly, J.2; Bhatnagar, A.1
通讯作者Bhatnagar, M.
来源期刊JOURNAL OF APPLIED PHYCOLOGY
ISSN0921-8971
出版年2012
卷号24期号:6页码:1387-1394
英文摘要

The desert cyanobacterium Anabaena variabilis produces an exopolymer during the stationary growth phase in batch culture. Optimal polymer production was observed at pH 10 under phosphorus limitation. Chemical analysis showed it to be composed of 49% carbohydrate and 19% protein. Monosaccharide analysis revealed a heteropolysaccharidic nature with glucose, mannose, and galactose as the main neutral sugars. Infrared (IR) spectrum of the exopolymer showed absorption bands at 1,645 and 1,421 cm(-1) characteristic of C=O in the carboxylate group. Strong band was observed at 1,072 cm(-1) due to C-O-C or C-O-P stretching vibrations. A band at 2,363 cm(-1) corresponding to C-H stretch of protein was also observed. IR spectrum suggested that the exopolymer is nonsulfated. Rheological properties of the polymer showed marked shear thinning non-Newtonian behavior in the concentration range of 0.1-0.4%. However, it appeared to undergo change in the internal structure on shearing thereby exhibiting thixotropic behavior. The polymer possessed 75% flocculating ability vis a vis alum, 71% emulsification of hexadecane, and good thermal stability making it a potent candidate for multiple industrial applications. The exopolymer bound 156 g H2O g(-1) and exhibited antibacterial activity against Staphylococcus aureus suggesting a potential for application in wound management as well.


英文关键词Anabaena variabilis Cyanobacteria Exopolymer Flocculant Water-absorbing capacity Wound healing
类型Article
语种英语
国家India
收录类别SCI-E
WOS记录号WOS:000310232900006
WOS关键词CYANOSPIRA-CAPSULATA ; CULTURE BROTHS ; POLYSACCHARIDES ; GROWTH ; EXOPOLYSACCHARIDE ; TOLERANCE ; POLYMERS ; BEHAVIOR ; MUCILAGE ; LAYER
WOS类目Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
WOS研究方向Biotechnology & Applied Microbiology ; Marine & Freshwater Biology
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/173155
作者单位1.MDS Univ, Dept Microbiol, Algae Biofuel & Biomol Ctr, Ajmer, Rajasthan, India;
2.Bengal Engn & Sci Univ, Dept Chem, Howrah, WB, India
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Bhatnagar, M.,Pareek, S.,Ganguly, J.,et al. Rheology and composition of a multi-utility exopolymer from a desert borne cyanobacterium Anabaena variabilis[J],2012,24(6):1387-1394.
APA Bhatnagar, M.,Pareek, S.,Ganguly, J.,&Bhatnagar, A..(2012).Rheology and composition of a multi-utility exopolymer from a desert borne cyanobacterium Anabaena variabilis.JOURNAL OF APPLIED PHYCOLOGY,24(6),1387-1394.
MLA Bhatnagar, M.,et al."Rheology and composition of a multi-utility exopolymer from a desert borne cyanobacterium Anabaena variabilis".JOURNAL OF APPLIED PHYCOLOGY 24.6(2012):1387-1394.
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