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Sains Malaysiana 51(3)(2022): 723-732
http://doi.org/10.17576/jsm-2022-5103-07
Oxidation of Lignin-Carbohydrate
Complex by Laccase/Co(salen) One-Pot Catalysis
(Pengoksidaan
Kompleks Lignin-Karbohidrat oleh Lakase/Co(salen) Pemangkinan Satu Periuk)
XUE-FEI ZHOU1,2,*
1Key Lab of Aromatic
Plant Resources Exploitation and Utilization in Sichuan Higher Education, Yibin University, 644000 Yibin, China
Received:
20 April 2021/Accepted: 8 August 2021
Abstract
Lignin-carbohydrate complex (LCC) is
hybrid structures containing covalently linked moieties of lignin and
carbohydrates. The nature and amount of LCC affect both industrial processes
and practical applications of lignocellulosic biomass. Herein, the LCC was
isolated from bamboo by successive solvent extraction and
precipitation. The effects and mechanism of LCC oxidation respectively by
laccase, Co(salen), and laccase/Co(salen) in the presence of molecular oxygen have been
investigated by composition analysis using the standard of National Renewable
Energy Laboratory (NREL) and high-performance anion exchange chromatography
(HPAEC), GPC, FTIR, and 2D-HSQC NMR. We can conclude that the laccase/Co(salen) one-pot catalysis modified the LCC in such a way
that more carbohydrate was removed from the LCC with lower molecular weight of
LCC as shown by GPC; the catalytic treatments produced oxidation at lignin
side-chains and cleavage of lignin β-O-4', β-β' and β-5'
bonds in LCC, and cleavage of benzyl-sugar ether, phenyl glycoside and
γ-ester bonds in LCC, as shown by FTIR and 2D-HSQC NMR, especially after
the laccase/Co(salen) one-pot treatment. The further
insight of LCC degradation was discussed in light of the results obtained in
oxidation of the LCC model compound coniferin.
Keywords: Co(salen);
lignin-carbohydrate complex (LCC); one-pot catalysis, laccase; oxidation
Abstrak
Kompleks lignin-karbohidrat (LCC) ialah struktur
hibrid yang mengandungi gugusan lignin dan karbohidrat yang dikaitkan secara
kovalen. Sifat dan jumlah LCC mempengaruhi kedua-dua proses perindustrian dan
aplikasi praktikal biojisim lignoselulosa. Di sini, LCC telah diasingkan
daripada buluh melalui pengekstrakan dan pemendakan pelarut berturut-turut.
Kesan dan mekanisme pengoksidaan LCC masing-masing oleh lakase, Co(salen) dan
lakase/Co(salen) dengan kehadiran molekul oksigen telah dikaji melalui analisis
komposisi menggunakan piawaian National Renewable Energy Laboratory (NREL) dan
anion berprestasi tinggi. Kromatografi pertukaran (HPAEC), GPC, FTIR dan
2D-HSQC NMR. Kita boleh membuat kesimpulan bahawa pemangkinan satu pot
lakase/Co(salen) mengubah suai LCC dengan cara yang lebih banyak karbohidrat
dikeluarkan daripada LCC dengan berat molekul LCC yang lebih rendah seperti
yang ditunjukkan oleh GPC; rawatan pemangkin menghasilkan pengoksidaan pada
rantaian sisi lignin dan pembelahan ikatan lignin β-O-4', β-β'
dan β-5' dalam LCC dan pembelahan ikatan benzil-gula eter, fenil glikosida
dan γ-ester dalam LCC, seperti yang ditunjukkan oleh FTIR dan 2D-HSQC NMR,
terutamanya selepas rawatan satu pot lakase/Co(salen). Kajian lanjut tentang
degradasi LCC telah dibincangkan berdasarkan keputusan yang diperoleh dalam
pengoksidaan koniferin sebatian model LCC.
Kata kunci: Co(salen); kompleks
lignin-karbohidrat (LCC); pemangkinan satu periuk, lakase; pengoksidaan
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*Corresponding author; email: lgdx602@sina.com
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