Three-dimensional alignment of cellulose II microcrystals under a strong magnetic field
Three-dimensional alignment of cellulose II microcrystals under a strong magnetic field
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强磁场下纤维素II微晶的三维排列
DOI：
10.1007/s10570-021-03954-z
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发表时间：
2021
期刊：
影响因子：
5.7
通讯作者：
Kimura Tsunehisa
中科院分区：
文献类型：
--
作者：
Wada Masahisa;Wakiya Sayuri;Kobayashi Kayoko;Kimura Satoshi;Kitaoka Motomitsu;Kusumi Ryosuke;Kimura Fumiko;Kimura Tsunehisa
在本研究中，在pH 7.0的磷酸盐缓冲液中，使用纤维糊精磷酸化酶（CDP）、蔗糖磷酸化酶（SP）和蔗糖与1-叠氮基-1-脱氧-β-葡萄糖苷（β-葡萄糖基叠氮化物）作为受体进行酶促合成。这产生在还原端具有叠氮基的纤维素低聚物（聚合度，DP> 10），为白色沉淀。通过将合成产物分散在水中，通过加热溶解和重结晶，获得表面上具有暴露的叠氮基的纤维素微晶的悬浮液。扁平的带状纤维素微晶是纤维素II的结晶形式，长度为几微米，宽度为几百纳米。微晶的厚度为5.1-5.2 nm，这相当于DP ≥ 10的纤维素低聚物的链长。当纤维素II微晶悬浮液在8 T的水平静磁场下干燥时，获得取向膜，其中微晶三维取向。薄膜的同步辐射X射线衍射研究表明，纤维素II晶体的易轴和中间轴（分别为χ 1和χ2）分别近似对应于[1 1 0]和[10]方向。
In this study, enzymatic synthesis was conducted using cellodextrin phosphorylase (CDP), sucrose phosphorylase (SP), and sucrose with 1-azido-1-deoxy-β-glucoside (β-glucosyl azide) as the acceptor in phosphate buffer at pH 7.0. This yielded cellulose oligomers (degree of polymerization, DP ≈ 10) with azido groups at the reducing end as a white precipitate. A suspension of cellulose microcrystals with exposed azido groups on the surface was obtained via dissolution and recrystallization of the synthetic products dispersed in water by heating. The flat, ribbon-like cellulose microcrystals were a crystalline form of cellulose II and were several micrometers in length and several hundred nanometers in width. The microcrystals were 5.1–5.2 nm thick, which is equivalent to the chain length of cellulose oligomers with DP ≈ 10. When the cellulose II microcrystal suspensions were dried under a horizontal static magnetic field of 8 T, oriented films were obtained, wherein the microcrystals were aligned three-dimensionally. Synchrotron X-ray diffraction studies of the films revealed that the easy and intermediate axes (χ1andχ2, respectively) of the cellulose II crystals corresponded approximately to the [1 1 0] and [10] directions, respectively.
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DOI：
--
发表时间：
2005
期刊：
Langmuir 21
影响因子：
--
作者：
深井周也;T.Kimura
通讯作者：
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DOI：
--
发表时间：
1995
期刊：
影响因子：
--
作者：
E. Samain;C. Lancelon;Frédéric Férigo;V. Moreau;H. Chanzy;A. Heyraud;H. Driguez
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H. Driguez
DOI：
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发表时间：
1997
期刊：
影响因子：
--
作者：
Nishiyama Yoshiharu;Kuga Shigenori;Wada Masahisa;Okano Takeshi
通讯作者：
Okano Takeshi
影响因子：
3.1
作者：
Hiraishi, Masao;Igarashi, Kiyohiko;Samejima, Masahiro
通讯作者：
Samejima, Masahiro
DOI：
10.1007/bf03045998
发表时间：
1935
期刊：
Proceedings of the Indian Academy of Sciences - Section A
影响因子：
--
作者：
P. Nilakantan
通讯作者：
P. Nilakantan