Unraveling lignin degradation in fibre cement via multidimensional fluorometry

Hoque, Mahfuzul; Kamal, Saeid; Raghunath, Sreenath; Foster, E. Johan

doi:10.1038/s41598-023-35560-3

Cited by 3 publications

References 45 publications

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Green and sustainable fabrication of DES-pretreated high-strength densified wood

Gondaliya,

Hoque,

Raghunath

et al. 2024

Wood Sci Technol

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Wood is a sustainable, benign, and high-performing green structural material readily available in nature that can be used to replace structural materials. However, insufficient mechanical performance (compared to metals and plastic), moisture sensitivity, and susceptibility to microorganism attack make it challenging to use wood as it is for advanced engineering applications. We here present an efficient approach to fabricating densified wood with minimal time and waste generation, demonstrating high mechanical strength, and decreased water penetration on the surface. Wood slabs were treated with deep eutectic solvents (DESs) to solubilize the lignin, followed by in-situ regeneration of dissolved lignin in the wood. Then, the slabs were densified with heat and pressure, turning the wood into a functionalized densified material. Lignin regeneration and morphological changes were observed via two-photon microscopy and Scanning Electron Microscopy (SEM), respectively. The final product is less susceptible to water absorption on the surface and has enhanced flexural strength (> 50% higher), surface hardness (100% increased), and minimal set recovery compared to natural wood. The improved mechanical performance is due to regenerated lignin which acts as a glue and fills spaces present within the interconnected cellulose network inside the wood, forming a highly dense composite during densification. Such enhancement in the properties of DES-densified wood composite makes it a favorable candidate for advanced structural and engineering applications.

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Green and sustainable fabrication of DES-pretreated high-strength densified wood

Gondaliya,

Hoque,

Raghunath

et al. 2024

Wood Sci Technol

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Moisture as key for understanding the fluorescence of lignocellulose in wood

Peters,

Rapp

2024

Cellulose

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The fluorescence behaviour of lignocellulose in Pinus sylvestris L. was studied under the influence of moisture. Fluorescence excitation-emission-matrices (EEMs) of the solid wood surfaces were recorded. Two emission peaks were identified, one attributed to lignocellulose, the other to pinosylvins. The two peaks were successfully modelled with PARAFAC2-deconvolution. Lignocellulose showed excitation-dependent emission. Its emission was quenched and blue-shifted by moisture, while pinosylvin showed none of these properties. The quenching efficiency was proportional to the moisture content (linear Stern–Volmer plot), a phenomenon first demonstrated for wood in this study. Potential mechanisms for the moisture quenching are discussed, with clustering-triggered emission best explaining most of the observed peculiarities. The strong influence of moisture on the fluorescence of pine wood suggests that carbohydrates, or interactions between carbohydrates and lignin, play an important role in lignocellulose fluorescence.

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Moisture as key for understanding the fluorescence of lignocellulose in wood

Peters,

Rapp

2023

Preprint

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The fluorescence behaviour of lignocellulose in Pinus sylvestris L. was studied under the influence of moisture. Fluorescence excitation-emission-matrices (EEMs) of the solid wood surfaces were recorded. Two emission peaks were identified, one attributed to lignocellulose, the other to pinosylvin. The 2 peaks were successfully modelled with PARAFAC2-deconvolution. Lignocellulose showed excitation-dependent emission. Its emission was quenched and blue-shifted by moisture, while pinosylvin showed none of these properties. The quenching efficiency was proportional to the moisture content (linear Stern-Volmer plot), a phenomenon first demonstrated for wood in this study. Potential mechanisms for the moisture quenching are discussed, with clustering-triggered emission best explaining most of the observed peculiarities. The strong influence of moisture on the fluorescence of pine wood suggests that carbohydrates play an important role in lignocellulose fluorescence.

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Unraveling lignin degradation in fibre cement via multidimensional fluorometry

Cited by 3 publications

References 45 publications

Green and sustainable fabrication of DES-pretreated high-strength densified wood

Green and sustainable fabrication of DES-pretreated high-strength densified wood

Moisture as key for understanding the fluorescence of lignocellulose in wood

Moisture as key for understanding the fluorescence of lignocellulose in wood

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