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Please use this identifier to cite or link to this item: http://repository.li.mahidol.ac.th/dspace/handle/123456789/25164
Title: Lead (Pb<sup>2+</sup>) adsorption characteristics and sugar composition of capsular polysaccharides of cyanobacterium Calothrix marchica
Authors: Suneerat Ruangsomboon
Amnat Chidthaisong
Boosya Bunnag
Duangrat Inthorn
Narumon W. Harvey
Joint Graduate School of Energy and Environment
King Mongkuts University of Technology Thonburi
Mahidol University
Keywords: Multidisciplinary
Issue Date: 1-Mar-2007
Citation: Songklanakarin Journal of Science and Technology. Vol.29, No.2 (2007), 529-541
Abstract: The ability of living cells of the cyanobacterium Calothrix marchica to adsorb Pb2+ was studied. C. marchica showed high efficiency to remove Pb2+. The desorbing agent, EDTA could effectively desorb Pb 2+ from cyanobacterial cells, suggesting that Pb2+ was mainly adsorbed on the cell surface, presumably binding with certain functional groups of capsular polysaccharides (CPS). Subsequently, production of CPS, their sugar contents and ability to absorb Pb2+ were studied in details. CPS production by C. marchica increased as growth proceeded. C. marchica showed the highest CPS content of 26.85 mg g-1 dry weight after 30-day of cultivation. The major components of CPS were carbohydrates and protein (37.6% and 34.7% of total CPS, respectively). The neutral sugars presented in CPS of C. marchica were xylose, arabinose, ribose, rhamnose, galactose, glucose, mannose and fructose. Acidic sugars including galacturonic and glucuronic acids were also found. The highest acidic sugar content was found after 30 days of cultivation. The extracted CPS of C. marchica could adsorb 64.15±5.09 mg Pb per g CPS. C. marchica cells with intact CPS adsorbed 3.42±0.07 mg Pb g-1 dry weight, which was not significantly different from cells without CPS. From these results, it can be concluded that C. marchica was able to remove Pb2+ rapidly and efficiently, and to produce high amount of CPS with acidic sugars 117.73±2.15 μg g-1 as the major component, suggesting that C. marchica could serve as one of the alternative bioadsorbers for Pb2+ in bioremoval systems.
URI: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=34250807124&origin=inward
http://repository.li.mahidol.ac.th/dspace/handle/123456789/25164
ISSN: 01253395
Appears in Collections:Scopus 2006-2010

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