Document Detail

A study towards release dynamics of thiram fungicide from starch-alginate beads to control environmental and health hazards.
MedLine Citation:
PMID:  18455295     Owner:  NLM     Status:  MEDLINE    
In order to make the judicious use of thiram fungicide we have developed starch- and alginate-based controlled and sustained agrochemical delivery system in the form of beads using calcium chloride (CaCl2) as crosslinker. The beads were characterized by FTIR and swelling studies. To study the effect of composition of the beads on the release dynamics of fungicide (thiram), beads were prepared by varying the amount of starch, alginate and crosslinker in the beads. Formulation characteristics like entrapment efficiency, bead size, percentage equilibrium swelling of the beads and diffusion mechanism for thiram release have been evaluated. Maximum (93.33+/-2.89)% swelling and maximum (80.67+/-0.83)% thiram release has occurred in the beads prepared with 15% starch, 1% alginate and 0.1M crosslinker solution. In most of the formulations the entrapment efficacy of thiram has been observed more than 90% and the values for the diffusion exponent 'n' have been obtained >1 which shows that the release of fungicides occurred through Case II diffusion mechanism.
Baljit Singh; D K Sharma; Atul Gupta
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-03-22
Journal Detail:
Title:  Journal of hazardous materials     Volume:  161     ISSN:  0304-3894     ISO Abbreviation:  J. Hazard. Mater.     Publication Date:  2009 Jan 
Date Detail:
Created Date:  2008-11-18     Completed Date:  2009-02-24     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9422688     Medline TA:  J Hazard Mater     Country:  Netherlands    
Other Details:
Languages:  eng     Pagination:  208-16     Citation Subset:  IM    
Department of Chemistry, Himachal Pradesh University, Shimla 171005, India.
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MeSH Terms
Alginates / chemistry*
Fungicides, Industrial / analysis*,  chemistry*
Glucuronic Acid / chemistry
Hazardous Substances*
Hexuronic Acids / chemistry
Molecular Structure
Spectroscopy, Fourier Transform Infrared
Starch / chemistry*
Thiram / analysis*,  chemistry*
Reg. No./Substance:
0/Alginates; 0/Fungicides, Industrial; 0/Hazardous Substances; 0/Hexuronic Acids; 137-26-8/Thiram; 576-37-4/Glucuronic Acid; 9005-25-8/Starch; 9005-32-7/alginic acid

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