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Facile green synthesis and antimicrobial performance of Cu2O nanospheres decorated g-C3N4 nanocomposite
摘要： In recent years, biosynthesis and green chemistry are the novel approach for the fabrication of nanoparticles. Cu2O nanospheres decorated graphitic carbonitride (g-C3N4) nanocomposite have been synthesized by hydrothermal method using extracts of Citrus limon leaves which acts as reducing and stabilizing elements for the biosynthesis of nanoparticles. The comparative antimicrobial assay of different mass percentage(1%,5%,10%) of Cu content in the nanocomposites revealed that the CuCN10 has the more effective zone of inhibition due to their average particle size range 2–10nm. The addition of g-C3N4 as a support for the Cu2O photocatalyst helps in enhancing the charge transfer and improving photocatalytic degradation of contaminants and microorganisms. Moreover, the synthesized composite showed good antibacterial properties against both Gram-negative and Gram-positive bacterial strains.
关键词： biosynthesis,zone of inhibition.,green chemistry,Citrus limon,photocatalyst,antimicrobial activity
更新于2025-09-23 15:23:52
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Determination of citalopram in fish brain tissue: benefits of coupling laser diode thermal desorption with low- and high-resolution mass spectrometry
摘要： Recent state-of-the-art methods developed for the analysis of polar xenobiotics from different types of biological matrices usually employ liquid chromatography with mass spectrometry. However, there are limitations when a small amount of sample mass is available. For example, individual benthic invertebrates or fish tissue samples often weigh less than 100 mg (e.g., brain, liver) but are necessary to understand environmental fate and bioaccumulation dynamics. We developed ultra-fast methods based on a direct sample introduction technique. This included coupling laser diode thermal desorption with atmospheric pressure chemical ionization mass spectrometry (LDTD-APCI-MS). We then quantitated a common selective serotonin reuptake inhibitor (citalopram) in brain tissues of individual juvenile fish after in vivo exposure to environmentally relevant concentration. Two mass spectrometric methods based on low (LDTD-APCI-triple quadrupole (QqQ)-MS/MS) and high (LDTD-APCI-high-resolution product scan (HRPS)) resolutions were developed and evaluated. Individual instrument conditions were optimized to achieve an accurate and robust analytical method with minimum sample preparation requirements. We achieved very good recovery (97–108%) across the range of 1–100 ng g?1 for LDTD-APCI-HRPS. LDTD-APCI-QqQ-MS/MS showed poorer performance due to interferences from the matrix at the lowest concentration level. LDTD-APCI ionization was successfully validated for analysis of non-filtered sample extracts. Evaluation of final methods was performed for a set of real fish brain samples, including comparison of LDTD-APCI-HRPS with a previously validated LC-heated electrospray ionization-HRPS method. This new LDTD-APCI-HRPS method avoids the chromatographic step and provides important benefits such as analysis of limited sample masses, lower total sample volume (typically μL), and reduction in analysis time per sample run to a few seconds.
关键词： Ambient ionization,Green chemistry,Laser diode thermal desorption,Psychoactive pharmaceutical,Juvenile fish
更新于2025-09-23 15:21:01
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Dataset concerning plasmonic thermal destruction of murine melanoma by gold nanoparticles obtained by green chemistry
摘要： The data presented in this article are related to the research paper “Proof of concept of plasmonic thermal destruction of surface cancers by gold nanoparticles obtained by green chemistry” (Ben Hadadda et al, 2019). In this article, we examined plasmonic thermal destruction of murine melanoma using gold nanoparticles obtained by green chemistry. The presented data were obtained by measuring tumor volume and mice weight in different groups of mice murine melanoma B16F10 treated or not with the nanoparticles and coupled to laser irradiation. These data were compared to the clinical reference treatment: anti-PD1 monoclonal antibody. The data were analyzed in order to be able to compare the antitumor effect of our treatment (photothermal plasmonic therapy using gold nanoparticles) and the reference treatment.
关键词： Green chemistry,Photothermal therapy,Cancer treatment,Gold nanoparticles,Murine melanoma
更新于2025-09-23 15:19:57
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A novel strategy for the synthesis of gold nanoparticles with Catharanthus roseus cell suspension culture
摘要： The purpose of this research was to develop a green method to synthesise gold nanoparticles (Au NPs) with cell suspension cultures of Catharanthus roseus. Reaction mixtures containing cell-free culture filtrate of C. roseus and gold III ions, which was initially pale yellow, turned wine red after 24-h incubation due to Au NP formation. UV–Vis spectra of the reaction mixtures showed a characteristic absorption peak at 546 nm. The biosynthesised NPs were predominantly spherical with 2–20 nm size; their crystalline nature was revealed by X-ray diffraction patterns. FTIR analysis indicated that Au NPs were capped by amide characteristic of plant proteins, which makes them apt for various applications.
关键词： Nanoparticle,Green chemistry,Cell culture,Gold,Catharanthus roseus
更新于2025-09-23 15:19:57
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A review on sustainable routes of synthesis and applications of Cuprous Oxide Nanoparticles and their Nanocomposites.
摘要： Nature acts like a “Bio-Laboratory” consisting of plants, algae, fungi, yeast etc. which are composed of bio-molecules. These naturally occurring bio-molecules play a vital role in the synthesis of Cuprous oxide (Cu2O) nanoparticles (NPs) and their nanocomposites (NCs) with distinct shapes and sizes, thereby acting as a driving force for designing safer, greener and sustainable routes using less hazardous chemicals. The present review focuses on the eco-friendly protocols for synthesis of Cu2O NPs and their NCs, characterisation techniques and various applications in organic catalysis, biosensing, environmental remediation and medicinal chemistry. The pivotal role of Cu2O NPs and their NCs in catalysing coupling reactions (C-C and C-N), multicomponent, oxidation-reduction and heterocyclic reactions have been higlighted. It emphasises its role in sustainability of the environment and its range of versatility in heterogenous catalysis. Furthermore, their use in biosensing (electrochemical detection) generates special interest in bioscience and clinical diagnosis. Their significance ensures to build a bridge between academic research and safety of the surroundings.
关键词： green chemistry,medicinal applications,biogenic synthesis,environmental remediation,biosensing,catalysis,Cuprous oxide nanoparticles
更新于2025-09-19 17:15:36
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Annealing Induced Oxygen Defects on Green Sonochemically Synthesized ZnO Nanoparticles for Photoelectrochemical Water Splitting
摘要： Zinc oxide (ZnO) nanoparticles were prepared by a green process using a simple sonochemical method. The prepared nanoparticles were annealed at different annealing temperatures in order to determine the role of the annealing temperature on the structural, morphological and optical properties of the prepared material. The defects related photoluminescence properties of the ZnO nanoparticles are discussed in detail. X-ray photoelectron spectroscopy provided the information regarding the presence of the defects in the material. ZnO emission related to defect emission was observed to increase with annealing temperature upto 600°C and then decreased. These defects played a crucial role in the performance of the photo-electrochemical (PEC) activity. The PEC performance has increased with an increase in the amount of oxygen related defects present in the material due to annealing.
关键词： PEC water splitting,Defects,XPS,Green chemistry,ZnO
更新于2025-09-19 17:15:36
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Completely aqueous route for metallization of structural polymeric materials in micro-electro-mechanical systems
摘要： A one-step aqueous diazonium-based process has been proved e?cient with respect to the covalent grafting of aminophenyl layers onto KMPR photoresist polymer. In contact with acidic palladium chloride solution for only a few minutes, the positively charged protonated aminophenyl groups on the modi?ed KMPR surface can electrostatically immobilize PdCl4 2? complexes. This KMPR surface functionalized with palladium-aminophenyl complex activators enables initialize the subsequent autocatalytic deposition of nickel (electroless nickel plating) and leads to a formation of adhesive nickel-boron ?lm onto KMPR substrate. Our proposed green chemistry strategy for the metallization of KMPR photoresist polymer via the diazonium reduction suggests an opportunity to bene?t from the incomparable physico-chemical properties of KMPR by integrating it within MEMS structures. The obtained 60 nm thick and compact nickel?boron alloy (93:7 by weight), evidenced through SEM, AFM and XPS techniques, can be used as a conductive seed layer for direct electrolytic deposition of copper. Consequently, a vacuum-free process for copper ?lling of mechanical features etched inside the KMPR layer has been demonstrated.
关键词： Metallization of structural polymers,One-step amination,Nickel seed layer,Green chemistry plating,Micro-electro-mechanical systems
更新于2025-09-19 17:15:36
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Microwave Synthesis of a Prominent LED Phosphor for School Students: Chemistry’s Contribution to Sustainable Lighting
摘要： Scarcer raw materials and climate change are scienti?c facts that make it necessary to enhance energy e?ciency and to recycle raw material. Fundamental researchers at universities as well as in industry agree that light-emitting diodes (LEDs) are the most e?cient and sustainable light sources of the future. Chemistry plays a signi?cant role in the development of white, energy-e?cient LEDs; however, students and society do not seem aware of this role. This paper presents a school-student-friendly synthesis of cerium-doped yttrium aluminum garnet (YAG:Ce) in a laboratory microwave oven. YAG:Ce is the most widely applied luminescent material (“phosphor”) used in white LEDs. The initial blue light of a gallium nitride-based primary LED is partly down-converted by the YAG:Ce phosphor on top of the LED chip, resulting in yellow-green emission. Additive color mixing (blue + yellow-green) results in cold-white light generation. This experiment aims to demonstrate chemistry’s contribution to sustainable development in a comprehensible way. On the basis of such phosphor-converted LEDs, the interdependence of and cooperation between di?erent scienti?c disciplines are outlined. The critical question of the related raw materials, in this case especially rare earth elements (REEs), their lifetime, and their possible recycling, represents another important issue for sustainable development and systems thinking and is shown in this example from everyday life.
关键词： Systems Thinking,Materials Science,High School/Introductory Chemistry,Sustainability,Green Chemistry,Curriculum
更新于2025-09-19 17:13:59
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Bio-assembly of CdS <sub/>x</sub> Se <sub/>1?x</sub> quantum dots in ryegrass
摘要： CdSxSe1?x quantum dots (QDs) were self-assembled in Lolium perenne. Root apical meristem, root hair and leaf apex were the ‘hot spots’ of QD formation. Not only the yield of QDs but also their chemical composition varied in di?erent tissues: higher Cd–S/Cd–Se ratios were identi?ed in stems and leaves than in roots.
关键词： Biosynthesis,Green Chemistry,Ryegrass,Quantum Dots,CdSxSe1?x
更新于2025-09-12 10:27:22
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Rapid synthesis of ZnO nanoparticles by waste thyme (Thymus vulgaris L.)
摘要： Synthesis of nanoparticles by utilizing microorganisms and plants in green methods is a feasible procedure. This method can be used instead of chemical procedures as an eco-friendly procedure. Antibacterial activity of zinc oxide nanoparticles as one of the best multifunctional nanoparticles is well known. In this study, ZnO nanoparticles were produced by waste thyme (Thymus vulgaris L.) extract. SEM, XRD, UV–Vis, visual analysis and FTIR spectroscopic techniques were used for characterizing ZnO nanoparticles. The absorption of wavelengths of the UV–Vis in the region of 290–320 nm confirmed the formation of zinc oxide nanoparticles. The average size of ZnO nanoparticles was estimated 10–35 nm by SEM technique. An eco-friendly method for the synthesis of ZnO nanoparticles can be used in which the waste thyme extract is used as a stabilizing agent. Therefore, the use of waste thyme extract is an alternative to the chemical methods. Biological methods are rapid, green, economical and simple to perform.
关键词： Medicinal plants,SEM,ZnO nanoparticles,UV–Vis,Green chemistry,XRD
更新于2025-09-11 14:15:04