Biosynthesis of zinc oxide nanoparticles using leaf extracts of Alchornea laxiflora and its tyrosinase inhibition and catalytic studies

Ekennia, Anthony C.; Uduagwu, Dickson N.; Olowu, Olawale J.; Nwanji, Obianuju L.; Oje, Obinna Aru; Daniel, Blessing; Mgbii, Sandra; Emma-Uba, Chimerem

doi:10.1016/j.micron.2020.102964

Cited by 43 publications

(21 citation statements)

References 26 publications

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“…The process of ZnO nanoparticles prepared from plant extracts is mild, environmentally friendly, highly efficient and low-cost and is in line with the direction of social progress [30]. Recently, a variety of plants have been applied for the preparation of ZnO nanoparticles, such as mint leaves [31], Phoenix dactylifera [32], Peganum harmala seed extract [33], Alchornea laxiflora leaf extract [34] and Couroupita guianensis Aubl leaf extract [35].…”

Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Hua

Wang³

et al. 2021

Nanomaterials

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Spartina alterniflora is an invasive plant from coastal wetlands, and its use in applications has garnered much interest. In this study, a composite photocatalyst (ZnO@BC) was synthesized by preparing zinc oxide (ZnO) nanoparticles with S. alterniflora extracts, S. alterniflora, and one-step carbonization, which was characterized using scanning electron microscope (SEM), transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FT-IR), Raman, X-ray photoelectron spectroscopy, ultraviolet–visible spectroscopy (UV–vis DRS), photoluminescence (PL) and N2 adsorption–desorption isotherm. The degradation capacity and mechanism of malachite green (MG) using ZnO@BC were analyzed under visible irradiation, and the degradation products of malachite green were detected by LC–MS. The results show that ZnO@BC has a larger surface area (83.2 m2/g) and various reactive groups, which enhance its photocatalytic efficiency, with the presence of oxygen vacancy further improving the photocatalytic activity. The total removal rate of malachite green (400 mg/L) using ZnO@BC is up to 98.38%. From the LC–MS analysis, it could be concluded that malachite green is degraded by demethylation, deamination, conjugate structure and benzene ring structure destruction. This study provides a novel idea for the high-value utilization of S. alterniflora.

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Section: Introductionmentioning

confidence: 99%

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Hua

Wang³

et al. 2021

Nanomaterials

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“…These results concluded that the ethanol extract, water fraction, and n-butanol fraction of C. odorata leaves have an inhibitory effect on Tyrosinase. Other studies have shown good anti-tyrosinase abilities at IC 50 ( 66.28 µg/mL) [14]. Another study demonstrated the many biological effects of the potential tyrosinase inhibitor of structurally related flavonoids (1)(2)(3)(4)(5)(6)(7)(8)(9) and found that all tested materials had a tyrosinase inhibitory effect compared to the positive control, and kojic acid showed the strong tyrosinase inhibitory effect with an IC value of 40.94 ± 0.78 µM [15].…”

Section: Figure 1: Comparison Diagram Of Botto-botto Leaf Sample Inhibition Percentagementioning

confidence: 93%

Tyrosinase Enzymes Activities and Sun Protection Factor of Ethanol Extract, Water Fraction, and n-Butanol Fraction of Chromolaena odorata L. Leaves

Tahir

Miskad

Djawad

et al. 2021

Open Access Maced J Med Sci

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Background: The need for skincare is increasing. One of the indicators of skin health is the brightness of the skin tone. Tyrosinase enzymes can darken the skin color due to their activity against melanin biosynthesis. The skin color will also change when exposed to UV rays, and even at a more severe level, it can cause cancer. Aims: The purpose of this study was to determine the inhibitory activity of the tyrosinase enzyme and the SPF (Sun Protection Factor) value of ethanol extract, water fraction, and n-butanol fraction from Chromolaena odorata L. leaves. Methods: In this study, tests were carried out on ethanol extract, water fraction, and an n-butanol fraction of C. odorata leaves to inhibit tyrosinase enzyme activity based on percent inhibition and determination of inhibitory activity against UV light based on the SPF value. Determination of tyrosinase enzyme inhibitory activity using an ELISA reader was carried out by calculating the IC50 value with kojic acid as a positive control and measuring the SPF value using UV-Vis spectrophotometry. Result: The results showed that the IC50 value of the tyrosinase enzyme inhibitory activity test, kojic acid as a positive control was 24.85 µg/mL (very strong), ethanol extract samples, water fraction, and n-butanol fraction were 191 µg/mL (weak), 65.86 µg/mL (very strong), and 14.59 µg/mL (very strong), respectively. The SPF value, including minimal protection shown by the ethanol extract at a concentration of 60 µg/mL, the water fraction at a 120 µg/mL concentration, and the n-butanol fraction a concentration of 40 µg/mL. Conclusion: The ethanol extract, water fraction, and n-butanol fraction of the Chromolaena odorata L. had an inhibitory effect on the tyrosinase enzyme and sun protection capacity used as an ingredient in cosmetic preparations

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“…The absorbance was measured at 490 nm with DIALAB EL800 Microplate Reader. The inhibition percentage (I%) compared to control was calculated based on the absorbance values with the following Equation:

where C is the absorbance of the control and S is the absorbance of the NP containing sample [ 30 ].…”

Section: Methodsmentioning

confidence: 99%

The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities

et al. 2021

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The application of Biolog EcoPlate™ for community-level physiological profiling of soils is well documented; however, the functional diversity of aquatic bacterial communities has been hardly studied. The objective of this study was to investigate the applicability of the Biolog EcoPlate™ technique and evaluate comparatively the applied endpoints, for the characterisation of the effects of metal oxide nanoparticles (MONPs) on freshwater microbial communities. Microcosm experiments were run to assess the effect of nano ZnO and nano TiO2 in freshwater at 0.8–100 mg/L concentration range. The average well colour development, substrate average well colour development, substrate richness, Shannon index and evenness, Simpson index, McIntosh index and Gini coefficient were determined to quantify the metabolic capabilities and functional diversity. Comprehensive analysis of the experimental data demonstrated that short-term exposure to TiO2 and ZnO NPs affected the metabolic activity at different extent and through different mechanisms of action. TiO2 NPs displayed lower impact on the metabolic profile showing up to 30% inhibition. However, the inhibitory effect of ZnO NPs reached 99% with clearly concentration-dependent responses. This study demonstrated that the McIntosh and Gini coefficients were well applicable and sensitive diversity indices. The parallel use of general metabolic capabilities and functional diversity indices may improve the output information of the ecological studies on microbial communities.

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Biosynthesis of zinc oxide nanoparticles using leaf extracts of Alchornea laxiflora and its tyrosinase inhibition and catalytic studies

Cited by 43 publications

References 26 publications

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Synthesis of ZnO Nanoparticles Loaded on Biochar Derived from Spartina alterniflora with Superior Photocatalytic Degradation Performance

Tyrosinase Enzymes Activities and Sun Protection Factor of Ethanol Extract, Water Fraction, and n-Butanol Fraction of Chromolaena odorata L. Leaves

The Biolog EcoPlate™ Technique for Assessing the Effect of Metal Oxide Nanoparticles on Freshwater Microbial Communities

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