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Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors

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Title: Determination of the absolute molar mass of acetylated eucalyptus kraft lignin by two types of size-exclusion chromatography combined with multi-angle laser light-scattering detectors
Authors: Wang, Linping Browse this author
Uraki, Yasumitsu Browse this author →KAKEN DB
Koda, Keiichi Browse this author →KAKEN DB
Gele, Aori Browse this author
Zhou, Xuesong Browse this author
Chen, Fangeng Browse this author
Keywords: absolute molar mass
acetylated hardwood kraft lignin
fractionation
multi-angle laser light scattering (MALLS)
Issue Date: 24-Apr-2019
Publisher: Walter de Gruyter
Journal Title: Holzforschung
Volume: 73
Issue: 4
Start Page: 363
End Page: 369
Publisher DOI: 10.1515/hf-2018-0119
Abstract: The molar mass (MM) and polydispersity indices (PDI) of acetylated hardwood kraft lignin (Ac-HWKL) and Ac-HWKL fractions were measured by size-exclusion chromatography with multi-angle laser light scattering (SEC-MALLS). The detectors worked at LL₆₅₈ ₙₘ and LL₇₈₅ₙₘ. The MM of Ac-HWKL measured at 785 nm was much smaller than that measured at 658 nm. The number-average (Mn) and weight-average (Mw) molar masses of Ac-HWKL determined at 785 nm were approximately 6.2 and 6.5 times larger, respectively, than the values estimated using a conventional calibration curve created with authentic polystyrene standards in tetrahydrofuran (THF). Based on the Mw of Ac-HWKL fractions, the Mark-Houwink-Sakurada equation for Ac-HWKL was established to be [η]/ml g⁻¹ = 0.320 M⁰∙²⁴ in THF and [η]/ml g⁻¹ = 0.142 M⁰∙²⁶ in dimethyl sulfoxide (DMSO). These results demonstrate that Ac-HWKL has a more compact structure in an organic solvent than polystyrene.
Type: article
URI: http://hdl.handle.net/2115/77655
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 浦木 康光

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