Canoethylation of Cassia tora Gum
| Main Authors: | , , |
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| Format: | Article |
| Language: | English Slovak |
| Online Access: | http://www.viks.sk/chk/star_1_03_38_42.doc |
| Abstract: | Summaries. Cyanoethylation of Cassia tora gum was carried out with acryionitrile in presence of sodium hydroxide under different reaction conditions. Variables studied were concentrations of sodium hydroxide and acryionitrile, reaction temperature and time. The degree of substitution, reaction efficiency and total extent of etherification were determined. The optimum conditions for preparing cyanoethyl Cassia tora gum (DS 0.44) were 0.608 mol acryionitrile and 0.625 mol sodium hydroxide at 30 °C for 4 h. Rheo-logical properties of cyanoethyl Cassia tora gum solutions showed non-Newtonian pseudopiastic behavior regardless of the degree of substitution (DS). At a constant rate of shear the apparent viscosity of cyanoethyl Cassia tora gum solutions increased with the increase in %N of the product. Conclusions. The optimum reaction conditions for cyanoethylation of CTG are: [CTG] = 0.246 mol; [NaOH] = 0.625 mol; [AN] = 0.608 mol; time = 4 h; temperature = 30 °C. CE-CTG shows good cold water solubility, solution stability, solution clarity and increased viscosity. With all these properties the CE-CTG can be exploited in a much better way for its industrial applications. |
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| ISSN: | ISSN 0038-9056 |
