期刊
ACS SUSTAINABLE CHEMISTRY & ENGINEERING
卷 4, 期 10, 页码 5136-5151出版社
AMER CHEMICAL SOC
DOI: 10.1021/acssuschemeng.6b01475
关键词
Organosolv lignin; Fractional precipitation; P-31 NMR; QQ-HSQC; HSQC(0); logP; Antioxidant activity; XPS; DSC; TGA
资金
- European Union in the form of the EU [282945]
- COST Action [FP0901, FP1105]
- European Union project EU-NMR-European Network of Research Infrastructures for Providing Access & Technological Advancement in Bio-NMR [026145]
Wheat straw organosolv lignin has been thoroughly characterized with respect to bulk material properties, surface properties, and structural characteristics by means of antioxidant assays and determination of the equilibrium constant in water octanol partitioning, i.e., logP determination, optimized gel permeation chromatography, quantitative P-31 NMR spectroscopy, quantitative HSQC measurements, and XPS studies. The material was subsequently fractionally precipitated based on a binary solvent system comprised of n-hexane and acetone to yield four fractions that exhibit distinct molecular mass characteristics, while displaying similar structural characteristics, as revealed by the same set of analysis techniques applied to them. Extensive correlation studies underline the versatility of the obtained fractions as higher quality starting materials for lignin valorization approaches since, for example, glass transition temperatures correlate well with number-average molecular weights, applying the Flory-Fox relation as well as its Ogawa and Loshaek variations.
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