Laccase-mediated biografting of p -coumaric acid for development of antibacterial and hydrophobic properties in coconut fibers

Thakur, Kamini; Kalia, Susheel; Sharma, Neha; Pathania, Deepak

doi:10.1016/j.molcatb.2015.10.002

Cited by 19 publications

(9 citation statements)

References 27 publications

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“…The application of laccase for the functional modification of lignocellulosic fibers has attracted much attention in recent years (Thakur et al 2015;Greimel et al 2017 , as well as Cl -and SO4 2-ions, are commonly used in this type of modification through the use of additives and auxiliaries. Studies have shown that the presence of some exogenous ions has a noticeable impact on laccase activity and it greatly affects the efficiency of laccase in practical applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of Common Metal Ions and Anions on Laccase Catalysis of Guaiacol and Lignocellulosic Fiber

Zhou¹,

Dong²,

Wang³

et al. 2017

BioResources

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The effects of 12 common metal ionic compounds on the laccase catalytic activity in reactions using guaiacol as the substrate was determined using spectrophotometry. Furthermore, the influence of several metal ionic compounds on the generation of reactive oxygen species (ROS) by oxidation of lignin in jute fiber under laccase catalysis was studied by electron paramagnetic resonance (EPR) spectroscopy using N-tert-butylalpha-phenylnitrone (PBN) as the spin-trapping agent. , and Ag + exhibited either strong inhibitory effects on the catalysis of the substrate or a destructive effect on the structure of laccase itself. Furthermore, the results showed that an appropriate concentration of Cu 2+ helped to promote the thermal stability of laccase during the enzymatic reaction. This study could help researchers to avoid the use of inhibitory exogenous metal ions and anions in the application of laccase and to maximize the value of laccase.

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Section: Introductionmentioning

confidence: 99%

Effect of Common Metal Ions and Anions on Laccase Catalysis of Guaiacol and Lignocellulosic Fiber

Zhou¹,

Dong²,

Wang³

et al. 2017

BioResources

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“…Effect of activators (metal ions) on laccase activity. The effect of various metal ions, such as Al 3+ , As 2+ , Ag 2+ , Cd 2+ , CO 2+ , Cu 2+ , FeCl 3 , FeSO 4 , Hg 2+ , Mg 2+ , Mn 2+ , MO 2+ , Ni 2+ , Zn 2 + , and Li 2+ (1 mM) on the laccase activity was examined by incubating the enzyme along with the metal ions and 1.0 mM ABTS, for 15 min at 34˚C [35]. The residual activity of the enzyme, with a reference enzyme as 100%, was then estimated.…”

Section: Optimization Experiments On Purified Laccasementioning

confidence: 99%

Tree bark scrape fungus: A potential source of laccase for application in bioremediation of non-textile dyes

Sayyed

Bhamare²,

Sapna

et al. 2020

PLoS ONE

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Although laccase has been recognized as a wonder molecule and green enzyme, the use of low yielding fungal strains, poor production, purification, and low enzyme kinetics have hampered its large-scale application. Thus,this study aims to select high yielding fungal strains and optimize the production, purification, and kinetics of laccase of Aspergillus sp. HB_RZ4. The results obtained indicated that Aspergillus sp. HB_RZ4 produced a significantly large amount of laccase under meso-acidophilic shaking conditions in a medium containing glucose and yeast extract. A 25 μM CuSO 4 was observed to enhance the enzyme yield. The enzyme was best purified on a Sephadex G-100 column. The purified enzyme resembled laccase of A. flavus. The kinetics of the purified enzyme revealed high substrate specificity and good velocity of reaction,using ABTS as a substrate. The enzyme was observed to be stable over various pH values and temperatures. The peptide structure of the purified enzyme was found to resemble laccase of A. kawachii IFO 4308. The fungus was observed to decolorize various dyes independent of the requirement of a laccase mediator system. Aspergillus sp. HB_RZ4 was observed to be a potent natural producer of laccase, and it decolorized the dyes even in the absence of a laccase mediator system. Thus, it can be used for bioremediation of effluent that contains non-textile dyes.

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“…Compounds such as caffeic acid show antibacterial, antioxidant, antidiabetic, anti-inflammatory, anticarcinogenous, antiproliferative, hepatoprotective and cardioprotective function [17][18][19][20][21] , protocatechuic acid acts as inflammative 22 , chlorogenic acid act as anticancer 23,24 . Also, include sinapic acid which acts as antioxidant 25 , cinnamic acid acts as anticancer, antioxidant 26,27 , coumaric acid acts as antibacterial, immunomodulatory, antioxidant activity [28][29][30][31] . Flavonoid compounds such as myricetin show anti-atherosclerotic show, antiinflammatory 32,33 , Apigenin acts as antioxidant, anti-hyperglycaemic, anti-inflammatory, antiapoptotic, cytotoxic, cardiovascular [34][35][36][37][38][39] .…”

Section: Fig 12: Zone Of Inhibition Of Different Extracts Of a Aspementioning

confidence: 99%

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2020

IJPSR

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Green synthesis is one of the best routes for the silver nanoparticles (AgNPs). The present study revealed that the aqueous leaf extracts of Aeschynomene aspera, which contains alkaloids, flavonoids, phenols, terpenoids, anthocyanidins, indoles, glycosides, saponins and tannins, is found to be responsible for bioreduction during the synthesis of silver nanoparticles (SNPs). The colour change from light yellow to dark brown within 20 to 60 min indicates the formation of nanoparticles. The UV-Visible spectrum of the aqueous medium containing silver nanoparticles showed a Surface Plasmon Resonance peak at 450 nm. FT-IR analysis reveals that the phenols and amides are mainly responsible for reduction. XRD analysis clearly showed the characteristic Bragg peaks of (111), (200), (220), (311) facets of the face-entered cubic structure of silver nanoparticles and confirmed that these nanoparticles are crystalline in nature.HR-TEM analysis revealed that the green synthesized SNPs were spherical in shape with an average size of 10 nm. The antibacterial effect of synthesized AgNPs on different bacterial strains with the zone of inhibition 14.1 mm on Escherichia coli 12.2 mm on Pseudomonas aeruginosa, 11.3 mm on Staphylococcus aureus and 11.1 mm on Bacillus subtilis respectively. DPPH analysis shows that the nanoparticles possess 67.48 percent of antioxidant activity. The above results also correlated with the other species of Fabaceae such as, Abrus precatorius, Cicer arietinum, Callindra haematocephala Clitoria ternatea, and Pongamia pinnata both in their nanoparticles characteristics and also their antibacterial activity.

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Laccase-mediated biografting of p -coumaric acid for development of antibacterial and hydrophobic properties in coconut fibers

Cited by 19 publications

References 27 publications

Effect of Common Metal Ions and Anions on Laccase Catalysis of Guaiacol and Lignocellulosic Fiber

Effect of Common Metal Ions and Anions on Laccase Catalysis of Guaiacol and Lignocellulosic Fiber

Tree bark scrape fungus: A potential source of laccase for application in bioremediation of non-textile dyes

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