Improvement of nanofibrillation efficiency of alpha-chitin in water by selecting acid used for surface cationisation
Improvement of nanofibrillation efficiency of alpha-chitin in water by selecting acid used for surface cationisation
复制标题
通过选择用于表面阳离子化的酸来提高水中α-甲壳素的纳米纤化效率
DOI：
10.1039/c2ra22271j
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发表时间：
2013
期刊：
影响因子：
3.9
通讯作者：
Akira Isogai
中科院分区：
文献类型：
--
作者：
Zi-Dong Qi;Yimin Fan;Tsuguyuki Saito;Hayaka Fukuzumi;Yoshiyuki Tsutsumi;Akira Isogai
以不同的有机酸和无机酸为溶剂，在不同的pH和离子强度条件下，制备了部分脱乙酰α-甲壳素（PDACh）水分散体。分散体中的PDACh纳米原纤化的程度进行了研究，通过测量它们的光透射率，纳米原纤化产量，和zeta电位，并通过原子力显微镜观察。当在pH 3.5的水中使用抗坏血酸和某些一价酸时，获得高度透明的分散体，其主要由个体化的PDACh纳米纤丝（φ = 3.4 ± 1.5nm）组成。然而，未原纤化的PDACh束存在于用二价和三价酸制备的分散体中，这可能是因为PDACh原纤维之间形成离子交联。当分散体中的酸浓度调节至0.04 M时，具有较高分散体pH的那些表现出较高的纳米原纤化效率。添加过量的酸抑制PDACh的有效纳米原纤化，由于伴随发生的高离子强度。
Aqueous dispersions of partially deacetylated α-chitin (PDACh) were prepared using various organic and inorganic acids in water under various pH and ionic strength conditions. The degree of PDACh nanofibrillation in the dispersions was investigated by measuring their light transmittances, nanofibrillation yields, and zeta-potentials, and by atomic force microscopy observations. Highly transparent dispersions, consisting of mostly individualized PDACh nanofibrils (φ = 3.4 ± 1.5 nm), were obtained when ascorbic acid and certain monovalent acids were used in water at pH 3.5. However, unfibrillated PDACh bundles were present in dispersions prepared with divalent and trivalent acids, probably because of formation of ionic cross-linkages between PDACh fibrils. When the acid concentration in the dispersions was adjusted to 0.04 M, those with higher dispersion pH exhibited higher nanofibrillation efficiency. Addition of excess acid inhibited efficient nanofibrillation of PDACh, owing to the high ionic strength that concomitantly occurred.