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Browsing Journal articles (FP) by Subject "chitosan"
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- ItemRemoval of heavy metals from water by the direct addition of chitosan prepared from prawn and squilla shells(Asian Fisheries Society, 2009) Zynudheen, A.A.; Ninan, G.; Mathew, P.T.; Joseph, J.Chitosan was prepared from prawn shell and squilla and quality characteristics such as moisture, ash, viscosity and degree of deacetylation were determined. The efficiency of the prepared chitosan to remove heavy metals when directly added to water samples at 1% level was assessd. Water samples with the addition of unknown quantities of lead, zinc, cadmium, copper and iron and water samples collected from different locations in Vembanad lake were used in this study. Significant reduction in the concentration of heavy metals was observed after treatment with chitosan. Chitosan from prawn shell was found to be more effective in the removal of heavy metals from water. Treatment with prawn chitosan removed 68% cadmium from spiked samples, whereas squilla chitosan removed 37%. In the case of water samples collected from Vembanad lake, treatment with chitosan from prawn shell removed approximately 50% of cadmium and the same treatment resulted in removal of lead to non-detectable levels in the samples.
- ItemStudy on the production of chitin and chitosan from shrimp shell by using Bacillus subtilis fermentation(Elsevier, 2007) Sini, T.K.; Santhosh, S.; Mathew, P.T.Fermentation of shrimp shell in jaggery broth using Bacillus subtilis for the production of chitin and chitosan was investigated. It was found that B. subtilis produced sufficient quantities of acid to remove the minerals from the shell and to prevent spoilage organisms. The protease enzyme in Bacillus species was responsible for the deprotenisation of the shell. The pH, proteolytic activity, extent of demineralization and deprotenisation were studied during fermentation. About 84% of the protein and 72% of the minerals were removed from the shrimp shell after fermentation. Mild acid and alkali treatments were given to produce characteristic chitin and their concentrations were standardized. Chitin was converted to chitosan by N-deacetylation and the properties of chitin and chitosan were studied. FTIR spectral analysis of chitin and chitosan prepared by the process was carried out and compared with spectra of commercially available samples. 2007 Elsevier Ltd. All rights reserved.