Paper Type |
Contributed Paper |
Title |
Preparation of Depolymerized Chitosan and Its Effect on Dyeability of Mangosteen Dye |
Author |
Charuwan Suitcharit*[a], Farisan Awae [a], Wae-a-risa Sengmama [a], and Kawee Srikulkit [b] |
Email |
csuitcharit@yahoo.com |
Abstract: The preparation of chitosan having various low molecular weights was carried out by treatment with sodium nitrite in acid media. The intrinsic viscosities of resultant chitosans designated to CTS-MW I, CTS-MW II, and CTS-MW III were measured for the determination of chitosan’s molecular weights using Mark-Houwink-Sakurada equation. As a result, the molecular weights of CTS-MW I, CTS-MW II, and CTS-MW III were 226 kDa, 10.8 kDa, and 7.2 kDa, respectively. In addition, thus obtained chitosans were characterised by infrared spectroscopy in order to determine the degree of deacetylation and nitrogen content. It was found that the molecular weight values as well as nitrogen content decreased with an increase in the amount of sodium nitrite. The opposite held true in case of percent degree of deacetylation. The application of chitosan onto cotton fabrics was also carried out. The effect of chitosan concentrations was studied. The results showed that percent nitrogen content tended to increase with an increase in the concentration of the depolymerized chitosans. Then, the co-application of chitosan and mangosteen dye extract on cotton fabric was carried out using three dyeing methods, namely, all-in-one method, pre-dyeing method, and post-dyeing method. It was found that the pre-dyeing method showed higher colour strength values in all cases. The effects of chitosan concentration and their molecular weights on colour fastness and fabric stiffness were also studied. The fi nding showed that chitosan with low molecular weights insignifi cantly imposed stiffness problem due to the lack of chitosan fi lm formation on the fabric surface.
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Start & End Page |
473 - 484 |
Received Date |
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Revised Date |
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Accepted Date |
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Full Text |
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Keyword |
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Volume |
Vol.38 No.3 (JULY 2011) |
DOI |
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Citation |
Suitcharit C., Awae F., Sengmama W. and Srikulkit K., Preparation of Depolymerized Chitosan and Its Effect on Dyeability of Mangosteen Dye, Chiang Mai J. Sci., 2011; 38(3): 473-484. |
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