74,994 research outputs found

    A REVIEW ON USE OF PLANT EXTRACTS FOR GOLD AND SILVER NANOPARTICLE SYNTHESIS AND THEIR POTENTIAL ACTIVITIES AGAINST FOOD PATHOGENS

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    ABSTRACTMetal nanoparticle synthesis using plant-mediated method is a highly explored field of nanotechnology. It has many advantages such as less timeconsumption and non-effective to human beings. Gold and silver nanoparticles (AuNPs and AgNPs) have been chosen for this study because of its widerange of applications and importance in different fields. This review explains different plant sources for the synthesis of AuNPs and AgNPs, and theirantimicrobial activity against food pathogens which will provide information to future studies.Keywords: Green synthesis, Gold nanoparticle, Silver nanoparticle, Antioxidant activity, Antimicrobial activity, Food pathogens

    SYNERGISTIC EFFECT OF SILVER NANOPARTICLES WITH DOXYCYCLINE AGAINST KLEBSIELLA PNEUMONIA

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    Objective: Green synthesis, characterization of silver nanoparticles (AgNPs) and study of the synergistic effect of AgNPs with antibiotic doxycycline against Klebsiella pneumonia.Methods: AgNps were synthesized from bacteria isolated from samples obtained from petroleum soil. After characterization of the nanoparticles, the antibacterial activity of the nanoparticle was studied, and simultaneously the same nanoparticle was used in combination with doxycycline antibiotic.Results: It was observed that compared to the effects of AgNps and antibiotic alone, the collective effect on both of them was more evident, which indicate the synergistic effect of the two components.Conclusion: These findings highlight the potential for AgNPs to enhance the activity of doxycycline antibiotic against Klebsiella pneumonia infections.Keywords: Silver nanoparticle, Green Synthesis, Klebsiella Pneumonia, Doxycyclin

    Multi-round recycling of green waste for the production of iron nanoparticles: synthesis, characterization, and prospects in remediation

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    Due to the widespread applications of metal nanoparticles (NPs), green synthesis strategies have recently advanced, e.g., methods that utilize extracts made from different plant wastes. A particularly innovative approach to reducing large amounts of available household/agricultural green wastes is their application in nanoparticle generation. Regarding this, the aim of our work was to examine the possibility of upgrading green nanoparticle syntheses from an innovative economic and environmental point of view, namely by investigating the multiple recyclabilities of green tea (GT), coffee arabica (CA), and Virginia creeper ( Parthenocissus quinquefolia ) (VC) waste residues for iron nanoparticle (FeNPs) synthesis. The plant extracts obtained by each extraction round were analyzed individually to determine the amount of main components anticipated to be involved in NPs synthesis. The synthesized FeNPs were characterized by X-ray powder diffraction and transmission electron microscopy. The activity of the generated FeNPs in degrading chlorinated volatile organic compounds (VOC) and thus their future applicability for remediation purposes were also assessed. We have found that VC and especially GT residues could be reutilized in multiple extraction rounds; however, only the first extract of CA was suitable for FeNPs’ generation. All of the obtained FeNPs could degrade VOC with efficiencies GT1-Fe 91.0%, GT2-Fe 83.2%, GT3-Fe 68.5%; CA1-Fe 76.2%; VC1-Fe 88.2%, VC2-Fe 79.7%, respectively, where the number (as in GT3) marked the extraction round. These results indicate that the adequately selected green waste material can be reutilized in multiple rounds for nanoparticle synthesis, thus offering a clean, sustainable, straightforward alternative to chemical methods

    GREEN SYNTHESIS, CHARACTERIZATION, AND ANTIBACTERIAL ACTIVITY OF ZINC OXIDE NANOPARTICLE

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    Objectives: Zinc oxide (ZnO) nanoparticles have received considerable attention due to their antimicrobial, UV blocking, and high catalytic and photochemical activities. Hence, an investigation has been carried out to synthesize the ZnO nanoparticle using aqueous Phyllanthus niruri (Keezhanelli) leaf extract. Aims and objectives of the present study are to synthesize using Keezhanelli (P. niruri) leaf extract, to study its characterization, and to determine its antibacterial activity. Methods: Green synthesized ZnO nanoparticle was characterized by Fourier transform infrared (FTIR), scanning electron microscope (SEM), and transmission electron microscope (TEM) analysis. Antimicrobial activity of ZnO nanoparticle was carried out using agar well diffusion method. Results: The result of the synthesized ZnO nanoparticle using Keezhanelli (P. niruri) leaf extract showed the change of color from pale white to brown color. The result of FTIR analysis of green synthesized ZnO nanoparticle revealed the presence of biomolecules such as polyphenols, flavonoids, alkaloids, polysaccharide, amino acid, and proteins. The result of the SEM studies showed that the green synthesized ZnO nanoparticle was spherical and cylindrical in shape. The size of the ZnO nanoparticle was recorded to be 5 μm. The result of TEM studies of ZnO nanoparticle showed that majority of the particles were spherical in shape with the size of 2 μm. The result of antibacterial activity against four bacterial species showed that green synthesized ZnO nanoparticle was found to be efficient in inhibiting the growth of the bacterial isolates. Maximum zone formation was exhibited against Staphylococcus saprophyticus. Conclusion: Thus, from the results of the present study, it can be concluded that synthesis of ZnO nanoparticle using leaf extract of Keezhanelli (P. niruri) has several advantages such as simple, cost-effective, time consuming, safe, and eco-friendly compared to other methods of nanoparticle synthesis as evidenced in the present study

    Synthesis of Metal and Metal Oxide Nanoparticles Using Plant Extract: a Review

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    Nanotechnology is an emerging technology and it is related to various applications. Related to nanotechnology development, the use of green chemistry concept, low cost technology and sustainability is a must. Synthesis of nanoparticles using plant extract is a developing technique within the scheme. In this paper, study on metal/metal oxide synthesis and its aspects is presented for describing the potency of natural resources for nanoparticle synthesis within green chemistry approach

    Green Biosynthesis of Silver Nanoparticles Using Musa Acuminata Aqueous Flower Extract and Its Anti-Microbial Activities

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    Nanomaterials have gained much relevant in the world of science due to their applications in catalysis, wastewater treatment and desulfurization of fossil fuels, biotechnology, pharmaceuticals and medicine. The green approach of nanoparticle synthesis employs the use of non-toxic reagents and is now preferred to the other methods which include thermal decomposition, electrochemical, photochemical, microwave assisted process chemical methods. Silver nanoparticle was biosynthesized using flower extract of Musa acuminata as reducing and capping agents. The synthesized silver nanoparticle was confirmed by the colour change after addition of the flower extract of Musa acuminata into silver nitrate solution. The silver nanoparticle was characterized by UV–Visible spectrophotometer, scanning electron microscopy (SEM), energy-dispersive x-ray spectroscopy (EDX), and Fourier transform infrared (FTIR) spectrophotometer. The result of SEM reveals the formation of silver nanoparticle which was spherical in shape with varying sizes ranged between 20-30 nm. The biosynthesized silver nanoparticle gave absorption at 375 nm, revealed silver metal as the most abundant element, vibrational bands indicating the presence of quinone, amides and conjugated ketone which served as reducing and capping agent. The bio-synthesized silver nanoparticles revealed potent antibacterial activity and the economical synthesis of silver nanoparticle from aqueous flower extract of Musa acuminatawhich is ecofriendly. Keywords :Green synthesis; silver nanoparticles; flower extract; capping agents; antibacterial activity; scanning electron microscopy. DOI: 10.7176/CMR/11-7-02 Publication date:September 30th 201

    Green synthesis of nanomaterials - a scientometric assessment

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    The green synthesis of engineered nanomaterials (NMs) has deserved an enormous academic interest and huge financial investments during the last decades. However, this prominent position has not been followed by the rapid commercialization of NMs for real applications thus rendering their practical usefulness very doubtful and the appropriateness of novel investments in the field highly questionable. The present manuscript presents the first scientometric study on the green synthesis of NMs aiming to survey the scientific progress in this particular field and identify its main gaps while providing applicable suggestions to facilitate the knowledge transfer from laboratories to real full scale production and applications. The research on green synthesis of nanomaterials published in Web of Science during the period 1991–2019 is here carefully analyzed. Overall, 9 scientometric indicators are employed to interpret the results retrieved from the 8761 documents collected. It is found that 107 countries and nearly 22,400 authors have contributed to this subject, hence highlighting the relevance of this topic. The keywords spectrum is dominated by the term “nanoparticle” which full adoption takes place at the beginning of the 21st century. Some few years later, a batch of words like “silver nanoparticle”, “gold nanoparticle” and “nanocomposite” reaches a significant impact reflecting the emergence of commercial applications for these nanomaterials. It is only in 2009 that the keyword “green synthesis” gains strength, followed then by “biosynthesis” in 2010, making it evident a trend towards environmentally friendly reagents. The number of publications on green synthesis of nanomaterials displays up to now a sigmoidal like growth pattern, which points actually to a decrease on new arrivals, thus suggesting a possible forthcoming decline in this field. However, the analysis carried out in the present work allows identifying various gaps related to sustainability, which, if appropriately addressed, may contribute to a resurgence of the research on nanomaterials synthesis while fostering more frugal approaches on material synthesis tendencies.publishe

    Green Synthesis and Characterization of Silver Nanoparticles using Piper Betel Leaf Extract

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    Green synthesis of nanoparticles by biological reduction method using plant extract is recent development in synthetic chemistry. The green method of nanoparticles is easy, efficient and eco-friendly on comparison with other methods. Silver nanoparticles are synthesized by biological reduction of silver nitrate. Betle leaf extract was used to reduce the silver salt in to its silver nanoparticles. As prepared silver nanoparticles sample was characterized for its structure by employing powder X-ray diffraction (XRD) tool. The morphology of said metal nanoparticle was studied by Scanning Electron Micrograph (SEM) tool. Fourier Transform infrared (FTIR) spectral study was undertaken to know the bonding in the prepared silver sample. Formation of Ag particles was confirmed by energy dispersive X-ray analysis (EDX) study.Key words: Green synthesis, nanoparticle, Betle leaf extract, XRD, SEM, FTIR, EDX* Author for correspondence:  [email protected]

    A green chemistry-based classification model for the synthesis of silver nanoparticles

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    The assessment of the implementation of green chemistry principles in the syntheses of nanomaterials is a complex decision-making problem that necessitates the integration of several evaluation criteria. Multiple Criteria Decision Aiding (MCDA) provides support for such a challenge. One of its methods – Dominance-based Rough Set Approach (DRSA) – was used in this research to develop a model for the green chemistry-based classification of silver nanoparticle synthesis protocols into preference-ordered performance classes. DRSA allowed integration of knowledge from both peer-reviewed literature and experts (decision makers, DMs) in the field, resulting in a model composed of decision rules that are logical statements in the form: “if conditions, then decision”. The approach provides the basis for the design of rules for the greener synthesis of silver nanoparticles. Decision rules are supported by synthesis protocols that enforce the principles of green chemistry to various extents, resulting in robust recommendations for the development and assessment of silver nanoparticle synthesis that perform at one of five pre-determined levels. The DRSA-based approach is transparent and structured and can be easily updated. New perspectives and criteria could be added into the model if relevant data were available and domain-specific experts could collaborate through the MCDA procedure

    ANTIBACTERIAL ACTIVITY OF ZINC OXIDE NANOPARTICLE BY SONOCHEMICAL METHOD AND GREEN METHOD USING ZINGIBER OFFICINALE

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    Nanoparticles have made a steady progress in all the branches of science. It is used in biological applications including nanomedicine. Zinc oxide is also known as Zincite generally seen in a crystalline form. Zinc oxide nanoparticles are multifunctional. It has effective antibacterial activity. This study focuses on the synthesis of zinc oxide nanoparticle by the sonochemical and green method, characterized by XRD, SEM and to determine the antibacterial efficacy of green and chemical techniques.Results prove that green synthesized Zinc oxide nanoparticle shows the enhanced biocidal activity. In addition the current study has demonstrated that the particle size variation and surface area to volume ratio of green synthesized Zinc oxide nanoparticles are responsible for significant high antibacterial activity. From the result obtained it suggested that the biogenic green fabrication is a better choice due to eco-friendliness
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