Correlations of the physicochemical properties of organosolv lignins from <i>Broussonetia papyrifera</i> with their antioxidant activities

Yao, Lan; Yoo, Chang Geun; Dong, Chengyu; Meng, Xianzhi; Dai, Jun; Ragauskas, Arthur J.; Yang, Chunlei; Yu, Jae Hyeon; Chen, Xiong

doi:10.1039/d0se00940g

Cited by 22 publications

(16 citation statements)

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“…In fact, the signals attributed to O-aryl moieties arose from the resonance of both free and etherified phenolic units, thus preventing an accurate description of the correlations between antioxidant activity and free phenols. 35,36 Similar explanation may be advocated for the negative effect found for the carboxyl/esterified groups towards lignin antiradical power, which is, however, in contrast with previous findings. Both free and esterified carboxyl moieties resonate within the same chemical shift region, whereas antioxidant activity was positively related only to free carboxyl units.…”

Section: (C))mentioning

confidence: 60%

“…The positive relationships of the antioxidant activities with the relative amount of aromatic/phenolic moieties are well in line with the literature. 35 Additionally, the ability of DPPH to react with hydrogen atoms directly bound to the lignin aromatic ring further explains the obtained Pearson coefficients. 10 The lack of significant correlation between the relative amount of O-aryl groups and both DPPH and phenol content of (as measured by Folin-Ciocalteu method) should instead be attributed to the intrinsic limitations of the employed NMR technique.…”

Section: (C))mentioning

confidence: 64%

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Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

et al. 2021

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BACKGROUND Developing eco‐friendly antioxidant and antimicrobial substances originating from biomass residues has recently attracted considerable interest. In this study, two lignosulfonates and various oxidized water‐soluble lignins were investigated for their antioxidant properties, as assessed by ABTS, DPPH and Folin–Ciocalteu methods, and their antimicrobial activity against some bacterial strains responsible for human pathologies. RESULTS The lignosulfonates showed the largest antiradical/antimicrobial capacity, whereas the other substrates were less effective. The observed antioxidant/antibacterial properties were positively correlated with lignin aromatic/phenolic content. The positive correlation between antiradical and antimicrobial activities suggests that lignin scavenging capacity was also involved in its antibacterial activity. A greater antimicrobial performance was generally observed against Gram‐positive bacterial strains, and it was attributed to the intrinsic larger susceptibility of Gram‐positive bacteria to lignin phenols. A significant though lesser inhibitory activity was also found against Escherichia coli. CONCLUSION Our results confirmed the dependence of lignin antioxidant/antibacterial power on its extraction method and chemical structure, as well as on the type of bacterial strains. Identifying the relationship between lignin molecular composition and its antioxidant/antibacterial features represents an advance on the potential future use of renewable and eco‐compatible lignin materials in nutraceutical, pharmaceutical and cosmetic sectors. © 2021 Society of Chemical Industry.

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Section: (C))mentioning

confidence: 60%

Section: (C))mentioning

confidence: 64%

Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

et al. 2021

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“…Lignin could be substantially removed due to the acid catalyzed cleavage of β-aryl ether bonds (Kangas et al, 2015) resulting in a celluloserich solid residual with enhanced reactivity toward enzymes (Zhang et al, 2016;Dong et al, 2019;Meng et al, 2020). The advantage of OS pretreatment includes the enhanced digestibility of pretreated biomass and the high potential valorization ability of the obtained organosolv lignin (García et al, 2017;Sadeghifar et al, 2017;Yao et al, 2020).…”

Section: Organosolv Pretreatmentmentioning

confidence: 99%

Toward a Fundamental Understanding of the Role of Lignin in the Biorefinery Process

Yao

Meng

et al. 2022

Front. Energy Res.

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As one of the main components in biomass, lignin plays a vital role in the biorefinery industry. Its unique structural feature increases the dose of cellulases during enzymatic deconstruction and is an attractive resource for many high valued products. The inhibition of lignin on cellulases is proposed to occur in several ways, with the most studied being nonproductive enzyme binding, which is attributed to hydrogen bonding, hydrophobic and/or electrostatic interactions. This review provides a comprehensive review of how lignin is transformed during various pretreatment methods as well as how these changes impact the cellulases inhibition. Future pretreatment directions for decreased cellulases inhibition are also proposed.

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“…Two types of ultrasound equipment are commonly used at the lab scale: ultrasonic baths (indirect sonication) and probes (direct sonication) [24]. Today, UAE is considered a green technique for energy-efficient processes, with very important gains in terms of extraction efficiency and economically on an industrial scale [25,26]. In fact, new advances in the ultrasound field have been developed to meet actual needs [26] and some devices are available at the industrial scale, working in a continuous mode.…”

Section: Introductionmentioning

confidence: 99%

“…Today, UAE is considered a green technique for energy-efficient processes, with very important gains in terms of extraction efficiency and economically on an industrial scale [25,26]. In fact, new advances in the ultrasound field have been developed to meet actual needs [26] and some devices are available at the industrial scale, working in a continuous mode. Thus, the optimization of the extraction conditions at the lab scale is a required step before moving to the industrial scale.…”

Section: Introductionmentioning

confidence: 99%

Recovery of Bioactive Compounds from Industrial Exhausted Olive Pomace through Ultrasound-Assisted Extraction

Gómez‐Cruz

Contreras

Carvalheiro

et al. 2021

Biology

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Exhausted olive pomace (EOP) is the main agro-industrial waste of the olive pomace extracting industries. It contains phenolic compounds and mannitol, so the extraction of these bioactive compounds should be considered as a first valorization step, especially if EOP is used as biofuel. Therefore, EOP was subjected to bath-type ultrasound-assisted extraction (UAE), and the effects of the acetone concentration (20–80%, v/v), solid load (2–15%, w/v), and extraction time (10–60 min) on the extraction of antioxidant compounds were evaluated according to a Box–Behnken experimental design. By means of the response surface methodology, the optimum conditions were obtained: 40% acetone, 8.6% solids, and 43 min. For all the extracts, the total phenolic content (TPC), flavonoid content (TFC), and antioxidant activity (DPPH, ABTS, and FRAP) were determined. With the aim of shortening the extraction time, a two-level factorial experiment design was also carried out using a probe-type UAE, keeping the solid load at 8.6% (w/v) and the acetone concentration at 40% (v/v), while the amplitude (30–70%) and the extraction time (2–12 min) were varied to maximize the aforementioned parameters. Finally, a maximum of phenolic compounds was reached (45.41 mg GAE/g EOP) at 12 min and 70% amplitude. It was comparable to that value obtained in the ultrasonic bath (42.05 mg GAE/g EOP), but, remarkably, the extraction time was shortened, which translates into lower costs at industrial scale. Moreover, the bioactive compound hydroxytyrosol was found to be the major phenolic compound in the extract, i.e., 5.16 mg/g EOP (bath-type UAE) and 4.96 mg/g EOP (probe-type UAE). Other minor phenolic compounds could be detected by capillary zone electrophoresis and liquid-chromatography–mass spectrometry. The sugar alcohol mannitol, another bioactive compound, was also found in the extract, and its content was determined. Thus, the use of this technology can support the valorization of this waste to obtain bioactive compounds, including mannitol, hydroxytyrosol, and other derivatives, before being applied for other uses.

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Correlations of the physicochemical properties of organosolv lignins from Broussonetia papyrifera with their antioxidant activities

Abstract: To understand the influence of lignin characteristics on their antioxidant activities, lignin was isolated Broussonetia papyrifera by organosolv pretreatment under different temperatures. The physicochemical features of the lignins were investigated...

Cited by 22 publications

References 37 publications

Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

Valorization of lignins from energy crops and agro‐industrial byproducts as antioxidant and antibacterial materials

Toward a Fundamental Understanding of the Role of Lignin in the Biorefinery Process

Recovery of Bioactive Compounds from Industrial Exhausted Olive Pomace through Ultrasound-Assisted Extraction

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