AI Article Synopsis
- - Cross-linked and decolorized lignin nanoparticles (LNPs) were created from softwood Kraft lignin using enzymatic and chemical methods, showing stability in water and tetrahydrofuran, while maintaining their spherical shape and size.
- - Two types of fungal laccases (Trametes hirsuta and Melanocarpus albomyces) were utilized to facilitate the cross-linking of lignin, and various techniques such as high performance size exclusion chromatography and zeta potential measurements confirmed the oxidation and structural changes occurring in the nanoparticles.
- - The study highlights the potential for using Kraft lignin nanoparticles in advanced applications across industries like medicine, food, and cosmetics, emphasizing their environmental and practical significance. *
Article Abstract
Cross-linked and decolorized lignin nanoparticles (LNPs) were prepared enzymatically and chemically from softwood Kraft lignin. Colloidal lignin particles (CLPs, ca. 200 nm) in a non-malodorous aqueous dispersion could be dried and redispersed in tetrahydrofuran (THF) or in water retaining their stability i.e. spherical shape and size. Two fungal laccases, Trametes hirsuta (ThL) and Melanocarpus albomyces (MaL) were used in the cross-linking reactions. Reactivity of ThL and MaL on Lignoboost™ lignin and LNPs was confirmed by high performance size exclusion chromatography (HPSEC) and oxygen consumption measurements with simultaneous detection of red-brown color due to the formation of quinones. Zeta potential measurements verified oxidation of LNPs via formation of surface-oriented carboxylic acid groups. Dynamic light scattering (DLS) revealed minor changes in the particle size distributions of LNPs after laccase catalyzed radicalization, indicating preferably covalent intraparticular cross-linking over polymerization. Changes in the surface morphology of laccase treated LNPs were imaged by atomic force (AFM) and transmission emission (TEM) microscopy. Furthermore, decolorization of LNPs without degradation was obtained using ultrasonication with HO in alkaline reaction conditions. The research results have high impact for the utilization of Kraft lignin as nanosized colloidal particles in advanced bionanomaterial applications in medicine, foods and cosmetics including different sectors from chemical industry.
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| http://dx.doi.org/10.1016/j.enzmictec.2018.01.005 | DOI Listing |
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