Influence of dyestuffs on the crystallinity of a bacterial cellulose and a regenerated cellulose
Influence of dyestuffs on the crystallinity of a bacterial cellulose and a regenerated cellulose
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染料对细菌纤维素和再生纤维素结晶度的影响
DOI：
10.1177/0040517513517960
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发表时间：
2014
影响因子：
2.3
通讯作者：
Kunihiko Okajima
中科院分区：
文献类型：
--
作者：
Hitomi Miyamoto;Masaya Tsuduki;Mariko Ago;Chihiro Yamane;Mitsuo Ueda;Kunihiko Okajima
研究了肠杆菌CJF 002菌种在直接染料、酸性染料和碱性染料存在下培养得到的细菌纤维素(BC)的晶体结构。光学显微镜观察表明，直接染料和碱性染料对BC样品染色，而酸性染料不染色。这表明生成的BC样品中含有直接染料和碱性染料。广角X-射线衍射仪分析表明，当染料浓度大于0.05 wt%时，直接染料对BC的结晶有抑制作用，且BC(200)晶面的衍射峰角度移动较小，而碱性染料对BC的结晶几乎没有影响。此外，我们还研究了再生纤维素(RC)在铜铵溶液中的结晶度以及RC与染料的反应。染料对RC的结晶度几乎没有影响，即使在样品显示染色的情况下也是如此。结果表明，添加染料的RC样品中(110)和(020)的表观微晶尺寸略小于空白样品，而()的表观微晶尺寸与空白样品相当。这些结果表明，通过van der Waals相互作用结合在一起的纤维素分子片是RC形成的基本结构，它们可能在相对较高浓度的纤维素的铜铵溶液中保持其结构。
The crystal structures of bacterial cellulose (BC) obtained by cultivation of anEnterobacterspecies CJF 002 stock under the presence of direct, acid, and basic dyestuffs were examined. Optical microscopic observation showed that direct and basic dyestuffs stained BC samples but acid dyestuff did not. This suggests that direct and basic dyestuffs are contained within the resulting BC samples. Analysis of wide angle x-ray diffraction (WAXD) data indicates that direct dyestuffs inhibited crystallization of BC at dyestuff concentration in culture media (Cdye) of more than 0.05 wt% with lower angle shift of the diffraction peak for the (200) plane of BC, but almost no influence on BC crystallization in the case of basic dyestuff was observed. In addition, we investigated the crystallinity of regenerated cellulose (RC) from a cuprammonium solution and the reaction of RC with the dyestuffs. The dyestuffs had almost no impact on the crystallinity of RC even in cases where the samples showed staining. It was found that the apparent crystallite size of (110) and (020) in the RC samples with dyestuffs were slightly lower than that in the RC blank sample, while the apparent crystallite size of () in the RC samples with dyestuffs retain the values at the same level as the RC blank sample. These results suggest that the cellulose molecular sheets held together by van der Waals interactions were the basic structure formed from RC and they probably retain their structure in the cuprammonium solution at relatively high concentrations of cellulose.