Structural features and antioxidant activities of Chinese quince (Chaenomeles sinensis) fruits lignin during auto-catalyzed ethanol organosolv pretreatment

Cheng, Xi-Chuang; Guo, Xin-Ran; Qin, Zhao; Wang, Xuede; Liu, Hua‐Min; Liu, Yulan

doi:10.1016/j.ijbiomac.2020.08.249

Cited by 59 publications

(20 citation statements)

References 43 publications

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“…However, there is probably a small amount of lowermass phenolic compounds after the Soxhlet extraction step. The AEOL was isolated according to a previous publication (Cheng et al 2020). The chemical composition of AEOL was lignin 95.02% ± 1.05%, glucosan 0.21%, xylan 2.71%, arabinan 0.20%, and galactan 0.26%.…”

Section: Methodsmentioning

confidence: 99%

“…The HSQC spectra of AEOL, F2, and F4 are shown in Fig. 4, and the spectra were assigned according to previous reports (del Río et al 2012;Qin et al 2018c;Cheng et al 2020). Six substructures were identified (Fig.…”

Section: D-hsqc Nmr Spectramentioning

confidence: 96%

“…The organosolv process has been demonstrated as an effective technique for the collection of sulfur-free, low molecular-weight lignin with few inorganic impurities (Hamauzu et al 2010;Huang et al 2020). In a previous study, the effect of extraction conditions on auto-catalyzed ethanol organosolv lignin (AEOL) from Chinese quince fruit was assessed, confirming the optimal conditions to collect AEOL with high antioxidant performance (Cheng et al 2020). However, the antioxidant performance of AEOL was restricted by its high polydispersity of molecular weight (Mw) and diverse chemical group composition.…”

Section: Introductionmentioning

confidence: 92%

“…The molecular weight distributions of the acetylated lignin fractions were determined by GPC (Waters 1525; Waters, Milford, MA, USA). Acetylation of lignin fractions was carried out as reported previously (Cheng et al 2020). Polystyrene standards with different molecular weights (Mw in the range of 500 to 1,000,000) were used to calibrate the GPC system.…”

Section: Lignin Characterizationmentioning

confidence: 99%

“…The F1 and F4 fractions produced the lower char residues of 35.5% and 32.4%, respectively, which was presumably due to the high content of S-units in these two fractions, as revealed by their higher S/G ratios as indicated by the quantitative Py-GC/MS data (Table 2). Higher content of S-units, i.e., methoxy groups (-OCH3), in the lignin contributed to the low ratio of char residues of lignin (Cheng et al 2020). Thus, the amount of char residues was inversely proportional to the S/G ratio of the lignin sample.…”

Section: Thermal Stabilitymentioning

confidence: 99%

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Sequential extraction of organosolv lignin from Chinese quince fruit: Structural features and antioxidant activities of the obtained fractions

Cheng

Qin

Yang

et al. 2021

BioRes

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Lignin from the Chinese quince (Chaenomeles sinensis) fruit offers a promising source of natural antioxidant for industrial applications. However, the utilization of Chinese quince fruit lignin is restricted by its inhomogeneous nature. Accordingly, Chinese quince fruit lignin was sequentially fractionated with organic solvents of increasing dissolving capacity to prepare homogeneous lignin fractions. The GPC (gel permeation chromatography) results showed that the molecular weights of lignin fractions increased from dichloromethane fraction to dioxane/water fraction. The five lignin fractions were also compared with respect to yield, carbohydrate content, thermal stability, inter-unit linkages, S/G ratios, and phenolic OH content. Among the five fractions, the ethyl acetate fraction showed a lower proportion of β-O-4′ linkages (48.4%), the highest thermal stability, the highest phenolic OH content (2.8 mmol/g), and the highest DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging index and reducing power. The high antioxidant performance of the ethyl acetate fraction implies that it can be used as a natural antioxidant. This study shows that sequential solvent fractionation of lignin can produce homogeneous fractions with enhanced antioxidant performance. In addition, it demonstrates that Chinese quince fruits are a potentially valuable natural resource.

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Section: Methodsmentioning

confidence: 99%

Section: D-hsqc Nmr Spectramentioning

confidence: 96%

Section: Introductionmentioning

confidence: 92%

Section: Lignin Characterizationmentioning

confidence: 99%

Section: Thermal Stabilitymentioning

confidence: 99%

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Sequential extraction of organosolv lignin from Chinese quince fruit: Structural features and antioxidant activities of the obtained fractions

Cheng

Qin

Yang

et al. 2021

BioRes

Self Cite

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Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Bergrath

Rumpf

Burger

et al. 2023

Macro Materials & Eng

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When optimizing the process parameters of the acidic ethanolic organosolv process, the aim is usually to maximize the delignification and/or lignin purity. However, process parameters such as temperature, time, ethanol and catalyst concentration, respectively, can also be used to vary the structural properties of the obtained organosolv lignin, including the molecular weight and the ratio of aliphatic versus phenolic hydroxyl groups, among others. This review particularly focuses on these influencing factors and establishes a trend analysis between the variation of the process parameters and the effect on lignin structure. Especially when larger data sets are available, as for process temperature and time, correlations between the distribution of depolymerization and condensation reactions are found, which allow direct conclusions on the proportion of lignin's structural features, independent of the diversity of the biomass used. The newfound insights gained from this review can be used to tailor organosolv lignins isolated for a specific application.

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Enhanced physicochemical characteristics and biological activities of low-temperature ethylenediamine/urea pretreated lignin

Pan,

Chen,

Kang

et al. 2024

Bioprocess Biosyst Eng

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Structural features and antioxidant activities of Chinese quince (Chaenomeles sinensis) fruits lignin during auto-catalyzed ethanol organosolv pretreatment

Cited by 59 publications

References 43 publications

Sequential extraction of organosolv lignin from Chinese quince fruit: Structural features and antioxidant activities of the obtained fractions

Sequential extraction of organosolv lignin from Chinese quince fruit: Structural features and antioxidant activities of the obtained fractions

Beyond Yield Optimization: The Impact of Organosolv Process Parameters on Lignin Structure

Enhanced physicochemical characteristics and biological activities of low-temperature ethylenediamine/urea pretreated lignin

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