Influence of Mg and Cu dual-doping on phytogenic synthesized ZnO for light induced antibacterial and radical scavenging activities
TL;DR: In this paper, dual-doping of zinc oxide (ZnO) with magnesium (Mg) and copper (Cu) were successfully performed using aqueous leaf extract of Ziziphus mauritiana Lam.
About: This article is published in Materials Science in Semiconductor Processing.The article was published on 2021-06-15. It has received 35 citations till now.
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TL;DR: In this article, a review of green extract-mediated synthesis of CeO2 NPs is presented, which discusses the effects on the NPs of various synthesis methods that have been reported.
Abstract: Cerium oxide nanoparticles (CeO2 NPs) are a sought-after material in numerous fields due to their potential applications such as in catalysis, cancer therapy, photocatalytic degradation of pollutants, sensors, polishing agents. Green synthesis usually involves the production of CeO2 assisted by organic extracts obtained from plants, leaves, flowers, bacteria, algae, food, fruits, etc. The phytochemicals present in the organic extracts adhere to the NPs and act as reducing and/or oxidizing agents and capping agents to stabilize the NPs, modify the particle size, morphology and band gap energy of the as-synthesized materials, which would be advantageous for numerous applications. This review focuses on the green extract-mediated synthesis of CeO2 NPs and discusses the effects on CeO2 NPs of various synthesis methods that have been reported. Several photocatalytic, antimicrobial, antioxidant and cytotoxicity applications have been evaluated, compared and discussed. Future prospects are also suggested.
50 citations
TL;DR: In this paper , the authors provide the latest research progress on advanced applications of ZnO nanostructure-based antibacterial coatings for medical devices, biomedical applications, and health care facilities.
Abstract: Rapid transmission of infectious microorganisms such as viruses and bacteria through person-to-person contact has contributed significantly to global health issues. The high survivability of these microorganisms on the material surface enumerates their transmissibility to the susceptible patient. The antimicrobial coating has emerged as one of the most interesting technologies to prevent growth and subsequently kill disease-causing microorganisms. It offers an effective solution a non-invasive, low-cost, easy-in-use, side-effect-free, and environmentally friendly method to prevent nosocomial infection. Among antimicrobial coating, zinc oxide (ZnO) stands as one of the excellent materials owing to zero toxicity, high biocompatibility to human organs, good stability, high abundancy, affordability, and high photocatalytic performance to kill various infectious pathogens. Therefore, this review provides the latest research progress on advanced applications of ZnO nanostructure-based antibacterial coatings for medical devices, biomedical applications, and health care facilities. Finally, future challenges and clinical practices of ZnO-based antibacterial coating are addressed.
26 citations
TL;DR: In this paper, ZnO and Fe doped zinc Oxide nanoparticles were prepared by green biosynthesis route using natural extract of Myrtus communis L as an effective chelating agent.
26 citations
TL;DR: In this paper, the green technology is creating an interest among researchers as they are simple, ecofriendly, and also cost-effective especially in synthesizing nanoparticles, and they are synthesized by taking copper nitrate as precursor and using the leaf extract of Capsicum frutescens as capping and stabilizing agent.
Abstract: The green technology is creating an interest among researchers as they are simple, ecofriendly, and also cost-effective especially in synthesizing nanoparticles. In the present study, CuO nanoparticles were synthesized by taking copper nitrate as precursor and using the leaf extract of Capsicum frutescens as capping and stabilizing agent. The visual observation of dark green color indicated the formation of CuO nanoparticles. The gas chromatograph illustrated the phytochemicals in leaf extract. The synthesized CuO nanoparticles were characterized by various analytical techniques such as UV–visible, X-ray diffraction, Fourier transform infra-red, dynamic light scattering, zeta potential and energy dispersive X-ray analyses. Field emission scanning electron micrographs and transmission electron micrographs illustrated the spherical and rectangular-rod shaped nanoparticles with its diameter (width) ranging from 20 to 40 nm. The antibacterial and biofilm activities against Gram-positive (Bacillus anthracis, and Listeria monocytogenes) and Gram-negative (Klebsiella pneumoniae) bacterial human pathogens showed strong inhibition at 95%, 94% and 92% in 150 μg/mL concentration, respectively. The antioxidant activity revealed high (97%) free radical scavenging property at 80 μg/mL concentration. The anti-inflammatory and anti-diabetic activities showed 90% and 85% efficacy at 500 μg/mL concentration, respectively. These results assured the synthesized CuO nanoparticles by using Capsicum frutescens leaf extract may have applications in the biomedical field.
24 citations
TL;DR: In this paper, pine pollen extracts were used to synthesize green-synthesized zinc oxide nanoparticles (K-doped ZnO NPs), which were analyzed using X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), and transmission electron microscopy (TEM).
Abstract: In this study, potassium-doped zinc oxide nanoparticles (K-doped ZnO NPs) were green-synthesized using pine pollen extracts based on bioethics principles. The synthesized NPs were analyzed using X-ray diffraction (XRD), inductively coupled plasma atomic emission spectroscopy (ICP-AES), scanning electron microscopy (SEM), energy-dispersive X-ray analysis (EDXA), and transmission electron microscopy (TEM). The cytotoxicity of these nanoparticles (NPs) on normal macrophage cells and cancer cell lines was evaluated. In the same concentrations of K-doped ZnO and pure ZnO NPs, K-doped ZnO NPs demonstrated higher toxicity. The results confirmed that the doped potassium could increase cytotoxicity. The IC50 of K-doped ZnO NPs, pure ZnO NPs, and the examined control drug were 497 ± 15, 769 ± 12, and 606 ± 19 µg/mL, respectively. Considering the obtained IC50 of K-doped ZnO NPs, they were more toxic to the cancer cell lines and had less cytotoxicity on normal macrophage cells.
19 citations
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TL;DR: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations as mentioned in this paper.
Abstract: The effective ionic radii of Shannon & Prewitt [Acta Cryst. (1969), B25, 925-945] are revised to include more unusual oxidation states and coordinations. Revisions are based on new structural data, empirical bond strength-bond length relationships, and plots of (1) radii vs volume, (2) radii vs coordination number, and (3) radii vs oxidation state. Factors which affect radii additivity are polyhedral distortion, partial occupancy of cation sites, covalence, and metallic character. Mean Nb5+-O and Mo6+-O octahedral distances are linearly dependent on distortion. A decrease in cation occupancy increases mean Li+-O, Na+-O, and Ag+-O distances in a predictable manner. Covalence strongly shortens Fe2+-X, Co2+-X, Ni2+-X, Mn2+-X, Cu+-X, Ag+-X, and M-H- bonds as the electronegativity of X or M decreases. Smaller effects are seen for Zn2+-X, Cd2+-X, In2+-X, pb2+-X, and TI+-X. Bonds with delocalized electrons and therefore metallic character, e.g. Sm-S, V-S, and Re-O, are significantly shorter than similar bonds with localized electrons.
51,997 citations
TL;DR: The antiradical properties of various antioxidants were determined using the free radical 2,2-Diphenyl-1-picrylhydrazyl (DPPH*) in its radical form as discussed by the authors.
Abstract: The antiradical activities of various antioxidants were determined using the free radical, 2,2-Diphenyl-1-picrylhydrazyl (DPPH*). In its radical form. DPPH* has an absorption band at 515 nm which dissappears upon reduction by an antiradical compound. Twenty compounds were reacted with the DPPH* and shown to follow one of three possible reaction kinetic types. Ascorbic acid, isoascorbic acid and isoeugenol reacted quickly with the DPPH* reaching a steady state immediately. Rosmarinic acid and δ-tocopherol reacted a little slower and reached a steady state within 30 min. The remaining compounds reacted more progressively with the DPPH* reaching a steady state from 1 to 6 h. Caffeic acid, gentisic acid and gallic acid showed the highest antiradical activities with a stoichiometry of 4 to 6 reduced DPPH* molecules per molecule of antioxidant. Vanillin, phenol, γ-resorcylic acid and vanillic acid were found to be poor antiradical compounds. The stoichiometry for the other 13 phenolic compounds varied from one to three reduced DPPH* molecules per molecule of antioxidant. Possible mechanisms are proposed to explain the experimental results.
18,907 citations
TL;DR: This review covered ZnO-NPs antibacterial activity including testing methods, impact of UV illumination,ZnO particle properties (size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration.
Abstract: Antibacterial activity of zinc oxide nanoparticles (ZnO-NPs) has received significant interest worldwide particularly by the implementation of nanotechnology to synthesize particles in the nanometer region. Many microorganisms exist in the range from hundreds of nanometers to tens of micrometers. ZnO-NPs exhibit attractive antibacterial properties due to increased specific surface area as the reduced particle size leading to enhanced particle surface reactivity. ZnO is a bio-safe material that possesses photo-oxidizing and photocatalysis impacts on chemical and biological species. This review covered ZnO-NPs antibacterial activity including testing methods, impact of UV illumination, ZnO particle properties (size, concentration, morphology, and defects), particle surface modification, and minimum inhibitory concentration. Particular emphasize was given to bactericidal and bacteriostatic mechanisms with focus on generation of reactive oxygen species (ROS) including hydrogen peroxide (H2O2), OH− (hydroxyl radicals), and O2 −2 (peroxide). ROS has been a major factor for several mechanisms including cell wall damage due to ZnO-localized interaction, enhanced membrane permeability, internalization of NPs due to loss of proton motive force and uptake of toxic dissolved zinc ions. These have led to mitochondria weakness, intracellular outflow, and release in gene expression of oxidative stress which caused eventual cell growth inhibition and cell death. In some cases, enhanced antibacterial activity can be attributed to surface defects on ZnO abrasive surface texture. One functional application of the ZnO antibacterial bioactivity was discussed in food packaging industry where ZnO-NPs are used as an antibacterial agent toward foodborne diseases. Proper incorporation of ZnO-NPs into packaging materials can cause interaction with foodborne pathogens, thereby releasing NPs onto food surface where they come in contact with bad bacteria and cause the bacterial death and/or inhibition.
2,627 citations
Book•
26 Jan 2012
TL;DR: Table Of ContentsIntroductionAlismataceae Sagittaria trifoliaAmaryllidaceaeAllium ampeloprasumAllium cepaAllium chinenseAllium sativumApiaceaeArracacia xanthorrhizaApium graveolens var.
Abstract: Table Of ContentsIntroductionAlismataceae Sagittaria trifoliaAmaryllidaceaeAllium ampeloprasumAllium cepaAllium chinenseAllium sativumApiaceaeArracacia xanthorrhizaApium graveolens var. rapaceum Daucus carotaPastinaca sativaAraceaeAlocasia macrorrhizos Amorphophallus paenoniifoliusColocasia esculentaCyrtosperma merkusiiXanthosoma sagittifoliumAraliaceaePanax ginsengAsparagaceaeAsparagus cochinchinensisCordyline fruticosaOphiopogon japonicasAsteraceaeArctium lappaHelianthus tuberosaSmallanthus sonchifoliusTragopogon porrifoliusBasellaceaeUllucus tuberosusBrassicaceaeArmoracia rusticanaBrassica napus var. napobrassicaBrassica oleracea (Gongylodes Group)Brassica rapa var. rapaEutrema japonicumLepidium meyeniiRaphanus raphanistrum subsp. SativusCampanulaceaeCodonopsis javanicaCodonopsis lanceolataMedical GlossaryScientific Glossary
686 citations