TY - JOUR
T1 - Crystal Polymorphism of Curdlan Propionate
T2 - 6-Fold versus 5-Fold Helices
AU - Marubayashi, Hironori
AU - Yukinaka, Kazuyori
AU - Enomoto-Rogers, Yukiko
AU - Hikima, Takaaki
AU - Takata, Masaki
AU - Iwata, Tadahisa
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research (A) (No. 26248044) from JSPS and an ALCA Project from JST. Synchrotron radiation experiments were performed at BL45XU of SPring-8 with the approval of RIKEN (Proposal Nos. 20140030 and 20150080).
PY - 2016/5/17
Y1 - 2016/5/17
N2 - The molecular and crystal structures of curdlan propionate (CDPr) were examined by the X-ray fiber diffraction methods combined with energy calculations. CDPr forms two different crystal structures (CDPr forms I and II) depending on annealing conditions: solvent-annealing yields CDPr form I, whereas thermal-annealing gives CDPr form II. In CDPr form I, the 6/1 helix is packed in the hexagonal unit cell with a = b = 1.154 nm, and c (fiber axis) = 2.287 nm. In the case of CDPr form II, the 5/1 helix is packed in the pseudohexagonal cell with a = b = 1.175 nm, and c (fiber axis) = 1.859 nm. The crystal transition from CDPr forms I to II occurs by thermal-annealing at temperatures ≥ 160 °C.
AB - The molecular and crystal structures of curdlan propionate (CDPr) were examined by the X-ray fiber diffraction methods combined with energy calculations. CDPr forms two different crystal structures (CDPr forms I and II) depending on annealing conditions: solvent-annealing yields CDPr form I, whereas thermal-annealing gives CDPr form II. In CDPr form I, the 6/1 helix is packed in the hexagonal unit cell with a = b = 1.154 nm, and c (fiber axis) = 2.287 nm. In the case of CDPr form II, the 5/1 helix is packed in the pseudohexagonal cell with a = b = 1.175 nm, and c (fiber axis) = 1.859 nm. The crystal transition from CDPr forms I to II occurs by thermal-annealing at temperatures ≥ 160 °C.
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U2 - 10.1021/acsmacrolett.6b00186
DO - 10.1021/acsmacrolett.6b00186
M3 - Article
AN - SCOPUS:84969834471
VL - 5
SP - 607
EP - 611
JO - ACS Macro Letters
JF - ACS Macro Letters
SN - 2161-1653
IS - 5
ER -