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題 名 | Effect of N-Acetylation on the Acidic Solution Stability and Permeability of Membrance Prepared from Different Chain Flexibility Chitosans=N-乙醯化對由不同鏈柔軟度的幾丁聚醣所製備的膜的酸性溶液安定性與滲透係數的影響 |
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作 者 | 陳榮輝; 華宏達; 黃俊儒; | 書刊名 | 臺灣水產學會刊 |
卷 期 | 25:4 1998.12[民87.12] |
頁 次 | 頁303-311 |
分類號 | 346.217 |
關鍵詞 | 幾丁聚醣; 膜; N-乙醯化; 酸性溶液安定性; 孔洞大小; 滲透係數; 鏈柔軟度; Chitosan; Membrane; N-acetylation; Acidic solution stability; Pore size; Permeability; Chain flexibility; |
語 文 | 英文(English) |
中文摘要 | 製備一系列幾丁聚醣與 N- 乙醯化幾丁聚醣膜後,探討在酸性溶液安定性與滲透 性質的差別,從不同鏈柔軟度的幾丁聚醣的溶液來製備未修飾的膜,經 N- 乙醯化後其取代 程度在 80% 到 90% 之間,聚葡萄醣 4(dextran 4,分子量 4000 ∼ 6000道爾敦),對 N- 乙醯化從 60% 去乙醯度的幾丁聚醣溶液所製備的膜的滲透係數比未修飾者低,然而聚葡萄 醣 4 對 N- 乙醯化從 90% 去乙醯度的幾丁聚醣溶液所製備的膜之滲透係數則比未修飾者高 ,顯示 N- 乙醯化改變膜的結晶度,即結晶度高的膜變成無定形 (Amorphous) 膜,而無定 形膜則變成結晶度高的膜,因而經乙醯化修飾後的膜的滲透係數改變,但孔洞密度從掃描電 子顯微鏡觀察 N- 乙醯化的膜與未修飾的膜相似,聚葡萄醣 4 可滲過,但細胞色素 C (Cytochrome C,分子量 12500 道爾敦) 則不能滲過這二種膜,未修飾之 pH 4.5 幾丁聚醣 溶液所製備的膜的滲透係數比從 pH 2.0 幾丁聚醣溶液製備者高也依序比從 pH 3.0 幾丁聚 醣溶液所製備的膜的滲透係數高,N- 乙醯化後會加大從不同 pH 溶液的幾丁聚醣溶液所製 備的膜的滲透係數的差別。 |
英文摘要 | A series of chitosan membranes and their N-acetylated counterparts were prepared and differences in their acidic solution stabilities and permeabilities were studied. Unmodified membranes were prepared from solutions of chitosans of different chain flexibilities. After N-acetylation, the degree of substitution ranged between 80% and 90%. Permeabilities of extran 4 (Mw 4000-6000 dalton) on N-acetylated membranes prepared from 60% degree of deacetylation (DD) chitosan were lower than on the original membranes, whereas, permeabilities of dextran 4 on N-acetylated membranes prepared from 90% DD chitosan were higher than those of unmodified membranes. This indicates that N-acetylation changed the crystalline membrane to an amorphous one, and the amorphous membrane to a crystalline one. Consequently, permeabilities of the modified membranes changed. However, pore densities of the original and modified membranes were similar as observed by SEM. Dextran 4 could permeate through both types of membranes, but cytochrome C (Mw 12500) could not. Permeabilities of membranes prepared from pH 4.5 chitosan solutions were higher than those from pH 2.0 and, in turn, higher than those from pH 3.0 solutions before or after N-acetylation. N-acetylation magnified the permeability differences in original membranes that were prepared from solutions of different pHs. |
本系統中英文摘要資訊取自各篇刊載內容。