author

学術雑誌論文

学術雑誌論文

text

Biopolymers.97(12) P.1010-P.1017

Solvent Dependent Conformation of a Regioselective Amylose Carbamate. Amylose-2-acetyl-3,6-bis(phenylcarbamate)

Wiley

英語

2012-09

http://hdl.handle.net/11094/53324

This is the peer reviewed version of the following article: Maiko Tsuda, Ken Terao, Shinichi Kitamura, Takahiro Sato, “Solvent-dependent conformation of a regioselective amylose carbamate: Amylose-2-acetyl-3,6-bis(phenylcarbamate)”, Biopolymers, Volume 97, Issue 12, pages 1010–1017, December 2012, which has been published in final form at DOI: 10.1002/bip.22118. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Self-Archiving.

Six amylose-2-acetyl-3,6-bis(phenylcarbamate) (AAPC) samples ranging in weight-average molar mass Mw from 1.8 × 10^4 g mol−1 to 1.1 × 10^6 g mol^<−1> have been prepared from enzymatically synthesized amylose samples. Static light scattering, small-angle X-ray scattering, sedimentation equilibrium, and viscosity measurements were made for the samples in 1,4-dioxane (DIOX), 2-ethoxyethanol (2EE), and 2-butanone (MEK) all at 25°C to determine particle scattering functions, z-average radii of gyration, intrinsic viscosities, as well as M_w. The data were analyzed in terms of the wormlike cylinder model mainly to yield the helix pitch per residue h and the Kuhn segment length λ^<−1>, which corresponds to twice of the persistence length. The latter parameters (λ^<−1>) in 2EE (11 nm) and MEK (12 nm) are quite smaller than those for amylose tris(phenylcarbamate) (ATPC) in the same solvent (16 nm in 2EE and 18 nm in MEK) whereas those for AAPC (21 nm) and ATPC (22 nm) in DIOX are essentially the same as each other. This indicates that the chain stiffness of AAPC is more strongly influenced by the solvents since the number of intramolecular H-bonds of AAPC is more changeable than that for ATPC.

Solvent Dependent Conformation of a Regioselective Amylose Carbamate. Amylose-2-acetyl-3,6-bis(phenylcarbamate)

Wiley

英語

2012-09

Biopolymers

97

12

1010

1017

10970282

http://hdl.handle.net/11094/53324