Abstract：
:Pullulan is soluble in both N,N-dimethylacetamide (DMAc) and LiCl/DMAc. Here, the solution-state structures of pullulan in these two solvents were studied by size-exclusion chromatography with multi-angle laser light scattering (SEC/MALLS) and nuclear magnetic resonance (NMR) analyses. SEC/MALLS and off-line refractive index analyses revealed that the hydroxy groups of pullulan interact with LiCl in DMAc, as observed previously for cellulose. The nine different COH protons of pullulan in DMAc and LiCl/DMAc appeared independently in NMR spectra and were successfully assigned. When LiCl was present, the degree of dissociation of all COH protons of pullulan was increased by Li+ and Cl- ions, and the conformations of the COH groups became stable and restricted in DMAc. Based on the obtained results, the solution-state structures of cellulose in LiCl/DMAc are hypothesized to contain similar interactions between the cellulose hydroxy groups, and Li+ and Cl- in LiCl/DMAc to those observed for pullulan.
journal_name
Int J Biol Macromoljournal_title
International journal of biological macromoleculesauthors
Ono Y,Furihata K,Isobe N,Saito T,Isogai Adoi
10.1016/j.ijbiomac.2017.10.141subject
Has Abstractpub_date
2018-02-01 00:00:00pages
2598-2603issue
Pt Beissn
0141-8130issn
1879-0003pii
S0141-8130(17)33051-9journal_volume
107pub_type
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journal_title：International journal of biological macromolecules
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journal_title：International journal of biological macromolecules
pub_type： 杂志文章
doi：10.1016/0141-8130(95)92678-j
更新日期：1995-06-01 00:00:00
