Free radical scavenging activity and reducing power of Acacia nilotica wood lignin

Aadil, Keshaw Ram; Barapatre, Anand; Sudha, S; Jha, Harit; Tiwary, Bhupendra N.

doi:10.1016/j.ijbiomac.2014.03.040

Cited by 113 publications

(77 citation statements)

References 35 publications

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“…The DPPH radical (DPPH•) scavenging assay was performed using the method that Aadil et al (2014) and Zhang et al (2014) described, with some modifications. Various concentration lignin samples (1 mL) in ethanol were added to 4 mL of a 0.2 mmol/L DPPH in ethanol.…”

Section: Antioxidant Activitymentioning

confidence: 99%

“…The lowest IC50 value of lignin samples was observed in the Catalyzed-OL, which decreased by 18.91% compared with OL. It has been reported that the DPPH• scavenging activity of lignin could be due to the phenolic hydroxyl groups and molecular weight (Aadil et al 2014). Furthermore, the antioxidant activity and phenolic hydroxyl groups have a positive correlation, and high molecular weight enhances the heterogeneity of lignin, which leads to a decreased free radical scavenging activity (Dizhbite et al 2004;Ugartondo et al 2008).…”

Section: Antioxidant Activitiesmentioning

confidence: 99%

“…Catalyzed-OL exhibited the lowest IC50 value 145.9 μg/mL, which was less than OL by 18.08%. Some literature on the lignin's antioxidant activity provided evidence that the scavenging activity of lignin on ABTS + radical is mainly due to the electron or proton transfer mechanism (Arshanitsa et al 2013;Aadil et al 2014). The high scavenging activity of Catalyzed-OL for ABTS + • was possibly due to the high phenolic hydroxyl content.…”

Section: Antioxidant Activitiesmentioning

confidence: 99%

“…The lowest IC50 value of lignin samples 265.4 μg/mL was observed in the Catalyzed-OL, which was decreased by 8.48% compared with OL. The reducing power assay is based on the mechanism of electro donating activity, which is the main mechanism of phenolic antioxidant action (Aadil et al 2014). The strong reducing power of Catalyzed-OL may be because the sample had more phenolic hydroxyl groups than others.…”

Section: Antioxidant Activitiesmentioning

confidence: 99%

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Antioxidant Activity of Organosolv Lignin Degraded Using SO42-/ZrO2 as Catalyst

Zhang¹,

Yan²,

Liu³

et al. 2015

BioResources

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Organosolv lignin degradation was carried out through hydrogenolysis routes with SO4 2-/ZrO2 as the catalyst. Structural characterization and antioxidant activity of organosolv lignin samples were investigated; the antioxidant activity of the organosolv lignin was compared with that of soda lignin. Results showed that the active functional groups contents of organosolv lignin were increased, and the antioxidant activity of organosolv lignin was improved. The total hydroxyl and phenolic hydroxyl group contents of organosolv lignin were increased by 15.81% and 26.55%, respectively, and the Mw was decreased from 5739 g/mol to 4499 g/mol. The IC50 of organosolv lignin on DPPH radicals scavenging rate, ABTS + radicals scavenging rate, and reducing power were decreased by 18.91%, 18.08%, and 8.48%, respectively. The catalyzed organosolv lignin can be used as a natural antioxidant for functional food or in cosmetic and polymeric materials.

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Section: Antioxidant Activitymentioning

confidence: 99%

Section: Antioxidant Activitiesmentioning

confidence: 99%

Section: Antioxidant Activitiesmentioning

confidence: 99%

Section: Antioxidant Activitiesmentioning

confidence: 99%

See 2 more Smart Citations

Antioxidant Activity of Organosolv Lignin Degraded Using SO42-/ZrO2 as Catalyst

Zhang¹,

Yan²,

Liu³

et al. 2015

BioResources

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“…The reducing power assay reveals the electron donating activity and can be used to evaluate the potential antioxidant activity of polysaccharide fractions [16,17]. As shown in Figure 4b, the …”

Section: In Vitro Antioxidant Activity Of Purified Fractionsmentioning

confidence: 99%

Ultrasound-Assisted Extraction, Antioxidant and Anticancer Activities of the Polysaccharides from Rhynchosia minima Root

Jia

Zhang

et al. 2015

Molecules

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Box-Behnken design (BBD), one of the most common response surface methodology (RSM) methods, was used to optimize the experimental conditions for ultrasound-assisted extraction of polysaccharides from Rhynchosia minima root (PRM). The antioxidant abilities and anticancer activity of purified polysaccharide fractions were also measured. The results showed that optimal extraction parameters were as follows: ultrasound exposure time, 21 min; ratio of water to material, 46 mL/g; ultrasound extraction temperature, 63˝C. Under these conditions, the maximum yield of PRM was 16.95%˘0.07%. Furthermore, the main monosaccharides of purified fractions were Ara and Gal. PRM3 and PRM5 exhibited remarkable DPPH radical scavenging activities and reducing power in vitro. PRM3 showed strong inhibitory activities on the growth of MCF-7 cells in vitro. The above results indicate that polysaccharides from R. minima root have the potential to be developed as natural antioxidants and anticancer ingredients for the food and pharmaceutical industries.

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Surface modification of bamboo fibers by diammonium phosphate and their applications in flame retardant thermoplastic polyurethane

Liu

Han

et al. 2021

J of Applied Polymer Sci

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Bamboo fibers (BF) were used as charring agent in thermoplastic polyurethane (TPU), together with ammonium polyphosphate (APP) to prepare intumescent flame retardant composites. In order to improve the dispersibility and flame retardant efficiency, BF was grafted with diammonium phosphate (DAP), named as modified bamboo fibers (M-BF). By the presence of 8 wt% APP and 2 wt% M-BF, the sample could achieve the maximal limiting oxygen index (LOI) value of 30.5% and V-0 rating in UL-94 test. The peak heat release rate for TPU/8APP/2 M-BF is 190 kW/m 2 , which is 86.0% lower than that of neat TPU. Besides, TPU/8APP/2 M-BF sample presented a tensile strength of 23.0 MPa, which was slightly lower than neat TPU sample. The thermogravimetric analysis for TPU composites and the morphology observation of the char demonstrated that APP and M-BF took effects on condensed phase through promoting the formation of intumescent char structure and free radical trapping. Meanwhile, it could release inert gases in gas phase. Therefore, M-BF exhibited great potential in applying as renewable charring agent for alleviating the depletion of petroleum resources.

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Free radical scavenging activity and reducing power of Acacia nilotica wood lignin

Cited by 113 publications

References 35 publications

Antioxidant Activity of Organosolv Lignin Degraded Using SO42-/ZrO2 as Catalyst

Antioxidant Activity of Organosolv Lignin Degraded Using SO42-/ZrO2 as Catalyst

Ultrasound-Assisted Extraction, Antioxidant and Anticancer Activities of the Polysaccharides from Rhynchosia minima Root

Surface modification of bamboo fibers by diammonium phosphate and their applications in flame retardant thermoplastic polyurethane

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