Dynamic Light Scattering Analysis Research Articles

Metilen mavisi boyasının aljinat-biyocam membranlara adsorpsiyonu: Cevap yüzey yöntemi, izoterm ve kinetik çalışmalar

In this research, environment-friendly composite membranes based on alginate (ALG) and bioglass nanoparticles (BGs) were prepared by the solvent casting technique and utilized as adsorbents for the elimination of methylene blue (MB) from water. Zeta potential of the particles was determined to be -24.9 mV by laser dynamic light scattering (DLS), and their sizes were found to be 773 and 777 nm by transmission electron microscopy (TEM) and DLS analysis, respectively. Atomic force microscope (AFM) analysis revealed that increasing the BGs content from 1 to 5% w/v caused the root mean square roughness of membranes to increase from 159.38 to 182.03 nm. The adsorption process was successfully modeled and optimized using a hybrid response surface methodology integrated central composite design (RSM-CCD). A statistical analysis was utilized to examine and optimize the effects of three important independent variables (concentration of BGs (1-5% w/v), pH of the solution (3-9), and initial dye level (15-45 mg L-1)) on MB adsorption performance. The findings indicated that the quadratic model was suitable for prediction of MB's removal. Optimized experimental parameters were found to be a pH of 9, a contact time of 120 min, an initial MB concentration of 45 mg L-1, and a BGs concentration of 1% (w/v). Freundlich isotherm and pseudo-second-order kinetic models were found to be the best-fitting models in isotherm and kinetic studies, respectively. Dubinin-Radushkevich (D-R) isotherm model predicted a chemical mechanism for MB adsorption onto the composite alginate membranes.

Well-Defined Shell-Sheddable Core-Crosslinked Micelles with pH and Oxidation Dual-Response for On-Demand Drug Delivery.

Micellar-nanocarrier-based drug delivery systems possessing characteristics such as an excellent circulation stability, inhibited premature release and on-demand site-specific release are urgently needed for enhanced therapeutic efficacy. Therefore, a novel kind of shell-sheddable core-crosslinked polymeric micelles with pH and oxidation dual-triggered on-demand drug release behavior was facilely constructed. The multifunctional micelles were self-assembled from a carefully designed amphiphilic triblock PEGylated polyurethane (PEG-acetal-PUBr-acetal-PEG) employing an acid-labile acetal linker at the hydrophilic-hydrophobic interface and pendant reactive bromo-containing polyurethane (PU) as the hydrophobic block, followed by a post-crosslinking via oxidation-cleavable diselenide linkages. These well-defined micelles exhibited an enhanced structural stability against dilution, achieved through the incorporation of diselenide crosslinkers. As expected, they were found to possess dual pH- and oxidation-responsive dissociation behaviors when exposure to acid pH (~5.0) and 50 mM H2O2 conditions, as evidenced using dynamic light-scattering (DLS) and atomic force microscopy (AFM) analyses. An in vitro drug release investigation showed that the drug indomethacin (IND) could be efficiently encapsulated in the micelles, which demonstrated an inhibited premature release compared to the non-crosslinked ones. It is noteworthy that the resulting micelles could efficiently release entrapped drugs at a fast rate in response to either pH or oxidation stimuli. Moreover, the release could be significantly accelerated in the presence of both acid pH and oxidation conditions, relative to a single stimulus, owing to the synergetic degradation of micelles through pH-induced dePEGylation and oxidation-triggered decrosslinking processes. The proposed shell-sheddable core-crosslinked micelles with a pH and oxidation dual-response could be potential candidates as drug carriers for on-demand drug delivery.

Kinetics of simultaneous degradation of brilliant green and methyl orange using biosynthesized high functional Ag nanoparticles

Abstract Nanoparticles synthesised using natural resources is a cost-effective and ecofriendly technique with a number of advantages. In current work, silver nanoparticles (AgNPs) have been synthesized using the extract of Fragaria ananassa seeds. The extract was used as a source of phytochemicals that can act as reducing and stabilizing agents. The characteristics of AgNPs were determined by UV/Visible, FTIR, SEM, XRD and Dynamic light scattering (DLS) techniques. The appearance of the distinctive absorption peak in UV-visible spectra at 430 nm confirmed the formation of AgNPs. The involvement of different bioactive functional groups with AgNPs was authenticated by FTIR studies. Particle size and morphology was confirmed by DLS, SEM and XRD analysis. The catalytic potential of AgNPs for the removal of poisonous organic dyes, brilliant green (BG) and methyl orange (MO) was also tested. Effect of different parameters including the catalyst concentration, dyes concentration and presence of different salts on the degradation of dyes was investigated. Nano-size and well-distributed nature of AgNPs, BG and MO dyes were degraded rapidly individually as well as simultaneously. The degradation process obeyed pseudo first order kinetics. Authors concluded that AgNPs synthesized using environment friendly and cost-effective method, can be used as a new tool to combat pollution caused by carcinogenic organic dyes.

Sericin mediated gold/silver bimetallic nanoparticles and exploration of its multi-therapeutic efficiency and photocatalytic degradation potential

The current investigation aimed at bimetallic gold-silver nanoparticles (Au/Ag NPs), here called BM-GS NPs, synthesis using sericin protein as the reducing agent in an easy, cost-effective, and sustainable way. The obtained BM-GS NPs were characterized by UV–Visible spectroscopy, Transmission electron microscopy (TEM), energy dispersive X-ray analysis (EDS), atomic force microscopy (AFM), Dynamic light scattering (DLS) and Zeta potential, X-ray Powder Diffraction (XRD), Fourier-transform infrared spectroscopy (FT-IR), and Thermogravimetric analysis followed by evaluation of its multitherapeutic and photocatalytic degradation potentials. The TEM analysis revealed its spherical nature and the EDS result displayed the presence of both Ag and Au elements, confirming the synthesis of BM-GS NPs. The XRD pattern verified the crystalline nature of the nanoparticles (NPs). The DLS analysis showed an average size of 86.08 d nm and the zeta potential showed a highly negative value (−26.3 mV) which specifies that the generated bimetallic NPs are stable. The BM-GS NPs exhibited positive wound healing potential (with 63.38% of wound closure rate at 25 μg/ml, as compared to 54.42% by the untreated control) with very negligible toxicity effect on the cell viability of the normal keratinocyte cells. It also demonstrated promising antioxidant properties with 65.00%, 69.23%, and 63.03% activity at 100 μg/ml concentration for ABTS (2, 2-azinobis) (3-ethylbenzothiazoline-6-sulfonic acid)), DPPH (1, 1 diphenyl-2-picrylhydrazyl) and SOD (superoxide dismutase enzyme) assays respectively, antidiabetic potential (with a significantly high α-glucosidase inhibition potential of 99.69% at 10μg/ml concentration and 62.11% of α-amylase enzyme inhibition at 100 μg/ml concentration) and moderate tyrosinase inhibitory potential (with 17.09% at 100 μg/ml concentration). Besides, it displayed reasonable antibacterial potential with the diameter of zone of inhibition ranging between 10.89 and 12.39 mm. Further, its antibacterial mode of action reveals that its effects could be due to being very smaller, the NPs could have penetrated inside the cellular membrane thereby causing rupture and damage to the interior materials leading to cellular lysis. The photocatalytic evaluation showed that synthesized BM-GS NPs have the efficiency of degrading methylene blue dye by 34.70% within 3 h of treatment. The above findings revealed the multi-therapeutic efficacy of the sericin globular protein-mediated BM-GS NPs and its potential future applications in the cosmetics and food sector and environmental contamination management industries.

Assessment of anti-psoriatic activity of bakuchiol-loaded solid lipid nanoparticles-based gel: design, characterization, and mechanistic insight via NF-kB signaling pathway.

The aim of the current study is to evaluate the anti-psoriatic potential of bakuchiol (Bak) loaded solid lipid nanoparticles (SLNs) via modulating inflammatory and oxidative pathways. Bak-loaded SLNs were prepared using hot homogenization method and characterized by various spectroscopic techniques. Bak-SLNs suspension was formulated into gel using Carbopol. Different in vivo assays were executed to explore the role of inflammatory markers and oxidative enzymes in psoriasis. DLS (dynamic light scattering) analysis showed suitable particle size, zeta potential, and polydispersity index (PDI) of developed formulation. TEM (transmission electron microscopy) reveal the spherical shape of Bak-SLNs particles. The release studies confirmed the sustained release of Bak-SLNs-based gel. UV-B-induced psoriatic Wistar rat model showed significant anti-psoriatic effect of Bak via regulating inflammatory markers (NF-kB, IL-6, IL-4, and IL-10) and levels of anti-oxidant enzymes, superoxide dismutase (SOD), catalase (CAT), glutathione (GSH), and glutathione-S-transferase (GST). Furthermore, RT-qPCR analysis confirms that Bak downregulates the expression of inflammatory markers, while histology and immunohistology results also confirm the anti-psoriatic effect of Bak. The study indicates that Bak-loaded SLNs-based gel significantly downregulates the level of cytokines and interleukins involve in NF-kB signaling cascade; hence, it can prove to be a novel therapeutic approach to cure psoriasis.

Enhancement of biological effects of oxidised nano- and microplastics in human professional phagocytes

Micro and nanoplastics are ubiquitous pollutants that can cause adverse health effects even in humans. Effects of virgin and oxidised (simulating the aging processes) polystyrene nano (nPS) and micro particles (mPS) with diameters of 0.1 and 1 µm were studied on human professional phagocytes (i.e., monocyte cells THP-1 and macrophage-like mTHP-1 cells). After characterization by ATR-FTIR, UV-Vis spectroscopy, SEM and dynamic light-scattering analyses, the particles were FITC functionalised to quantify cellular uptake. Changes in the cell compartments were studied by acrydine orange and the pro-oxidant, cytotoxic and genotoxic effects were assessed. Phagocytosis was dose- and time- dependent and at 24 h 52% of nPS and 58% of mPS were engulfed. Despite the high homeostasis of professional phagocytes, significant ROS increases and DNA damage were observed after exposure to oxidised particles. The results highlight that the environmental aging processes enhances the adverse health effects of micro and nanoplastics.

Biosynthesis of Silver Nanoparticles Produced Using Geobacillus spp. Bacteria.

Silver nanoparticles (AgNPs) are well known for their unique physical and chemical properties, which can be incorporated into a wide range of applications. The growing resistance of microorganisms to antimicrobial compounds promoted the use of AgNPs in antimicrobial therapy. AgNPs can be obtained using physical and chemical methods, but these technologies are highly unfriendly to nature and produce large amounts of side compounds (for example, sodium borohydride and N,N-dimethylformamide). Therefore, alternative technologies are required for obtaining AgNPs. This report focuses on the biosynthesis of silver nanoparticles through the reduction of Ag+ with the cell-free secretomes of four Geobacillus bacterial strains, namely, 18, 25, 95, and 612. Only a few studies that involved Geobacillus bacteria in the synthesis of metal nanoparticles, including AgNPs, have been reported to date. The silver nanoparticles synthesized through bio-based methods were characterized using UV-Vis spectroscopy, scanning electron microscopy (SEM), dynamic light scattering (DLS), and zeta potential measurements. UV-Vis spectroscopy showed a characteristic absorbance peak at 410-425 nm, indicative of AgNPs. SEM analysis confirmed that most nanoparticles were spherical. DLS analysis showed that the sizes of the obtained AgNPs were widely distributed, with the majority less than 100 nm in diameter, while the zeta potential values ranged from -25.7 to -31.3 mV and depended on the Geobacillus spp. strain.

Rapid and sensitive colorimetric determination of dopamine and serotonin in solution and polymer matrix with photochemically prepared and N-acetyl-L-cysteine functionalized gold nanoparticles

Here we report that the use of thioxanthone disulfide [TX-S-]2 photoinitiator as photo reducing agent for in-situ preparation of gold nanoparticles (AuNps) both in the presence and absence of N-acetyl cysteine (NAC) and these solutions were employed for colorimetric determination of dopamine (DA) and serotonin (SER) as very important two neurotransmitters for the human body at a micromolar level using solutions consist of AuNps. The UV-Vis spectroscopy technique was used for the determination of in-situ formed AuNps and the change of Surface Plasmon Resonance (SPR) band after each addition of DA and SER as a result of color changes. Dynamic Light Scattering (DLS) and Scanning Electron Microscope (SEM) analysis was used for the detailed characterization of AuNps. The method was linear in a concentration range between 7.45 and 24.4 µM. The limit of detection (LOD) and limit of quantification (LOQ) were found 8.4 and 28 µM, for DA and 5.41 and 18.04 µM for SER, respectively. Additionally, as a preliminary experiment, in-situ synthesis of AuNps was carried out in a polymer matrix with DA and SER and it was found that the sizes were in good agreement with previously prepared solutions. The color of the polymer matrix was turned from colorless to purple and then to dark purple even in 15 min irradiation times for both formulations.

Characterization of Amaranthus species: ability in nanoparticles fabrication and the antimicrobial activity against human pathogenic bacteria.

The present work aimed at differentiating five Amaranthus species from Saudi Arabia according to their morphology and the ability in nanoparticle formulation. Biogenic silver nanoparticles (AgNPs) were synthesized from leaf extracts of the five Amaranthus species and characterized by different techniques. Fourier-transform infrared spectroscopy (FT-IR) was used to identify the phyto-constituents of Amaranthus species. The nanoparticles (NPs) were characterized by UV-visible spectroscopy, dynamic light scattering (DLS), transmission electron microscopy (TEM), and energy-dispersive X-ray spectroscopy (EDX). The antibacterial activity of the synthesized NPs was tested against Staphylococcus aureus, E. coli, Klebsiella pneumoniae and Pseudomonas aeruginosa using the agar well diffusion method. Spherical NPs varying in size and functional groups from the five plant species were demonstrated by TEM, DLS and FTIR analysis, respectively. Variations in NPs characteristics could be related to the phytochemical composition of each Amaranthus species since they play a significant role in the reduction process. EDX confirmed the presence of Ag in plant fabricated AgNPs. Antibacterial activity varied among the species, possibly related to the NPs characteristics. Varied characteristics for the obtained AgNPs may reflect variations in the phytochemical composition type and concentration among Amaranthus species used for their fabrication.

New Insights into the Biological Response Triggered by Dextran-Coated Maghemite Nanoparticles in Pancreatic Cancer Cells and Their Potential for Theranostic Applications

Iron oxide nanoparticles are one of the most promising tools for theranostic applications of pancreatic cancer due to their unique physicochemical and magnetic properties making them suitable for both diagnosis and therapy. Thus, our study aimed to characterize the properties of dextran-coated iron oxide nanoparticles (DIO-NPs) of maghemite (γ-Fe2O3) type synthesized by co-precipitation and to investigate their effects (low-dose versus high-dose) on pancreatic cancer cells focusing on NP cellular uptake, MR contrast, and toxicological profile. This paper also addressed the modulation of heat shock proteins (HSPs) and p53 protein expression as well as the potential of DIO-NPs for theranostic purposes. DIO-NPs were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), dynamic light scattering analyses (DLS), and zeta potential. Pancreatic cancer cells (PANC-1 cell line) were exposed to different doses of dextran-coated ɣ-Fe2O3 NPs (14, 28, 42, 56 μg/mL) for up to 72 h. The results revealed that DIO-NPs with a hydrodynamic diameter of 16.3 nm produce a significant negative contrast using a 7 T MRI scanner correlated with dose-dependent cellular iron uptake and toxicity levels. We showed that DIO-NPs are biocompatible up to a concentration of 28 μg/mL (low-dose), while exposure to a concentration of 56 μg/mL (high-dose) caused a reduction in PANC-1 cell viability to 50% after 72 h by inducing reactive oxygen species (ROS) production, reduced glutathione (GSH) depletion, lipid peroxidation, enhancement of caspase-1 activity, and LDH release. An alteration in Hsp70 and Hsp90 protein expression was also observed. At low doses, these findings provide evidence that DIO-NPs could act as safe platforms in drug delivery, as well as antitumoral and imaging agents for theranostic uses in pancreatic cancer.

Improved Cycling Performance Using a Poly-2-Acrylamido-2-Methylpropanesulfonic Acid (AMPS)-Based Crosslinked Gel Polymer on a Sulfur Cathode for Inhibiting the Dissolution of Polysulfide in a Li–S Battery

In lithium–sulfur (Li–S) batteries, the impregnation of sulfur into electrically conductive materials of porous carbon plays a significant role in preventing the dissolution of lithium polysulfide (LiPS) into an electrolyte solution and improving cycling performance. However, this strategy does not render high-energy density to Li–S cells because of the limited amount of sulfur in porous carbon. Once the sulfur overflows out of porous carbon because of the significant volume change occurring during charge–discharge cycling, the LiPS formed outside porous carbon probably diffuses toward the anode, leading to poor cycling performance. In this study, the poly-2-acrylamido-2-methylpropanesulfonic acid (AMPS)-based polymer incorporated into the sulfur/porous carbon composite cathode in a Li–S cell effectively suppresses LiPS dissolution even when sulfur is present outside porous carbon, achieving good cycling performance with a capacity retention of 72% at the 100th cycle. Herein, the polymer used is poly-AMPS with a crosslinker of N-[tris(3-acrylamidopropoxymethyl)methyl]acrylamide, which is synthesized using 2-hydroxy-2-methylpropiophenone as the photoinitiator. The characteristics of the as-synthesized AMPS-based polymer and sulfur–carbon composite cathode are meticulously investigated by scanning electron microscopy–energy-dispersive X-ray spectrometry, transmission electron microscopy, dynamic light-scattering analysis, thermogravimetric analysis, and X-ray diffraction.

Effect of zinc oxide nanoparticles synthesized from Carya illinoinensis leaf extract on growth and antioxidant properties of mustard (Brassica juncea).

The sustainability of crop production is impacted by climate change and land degradation, and the advanced application of nanotechnology is of paramount importance to overcome this challenge. The development of nanomaterials based on essential nutrients like zinc could serve as a basis for nanofertilizers and nanocomposite synthesis for broader agricultural applications and quality human nutrition. Therefore, this study aimed to synthesize zinc oxide nanoparticles (ZnO NPs) using pecan (Carya illinoinensis) leaf extract and investigate their effect on the growth, physiology, nutrient content, and antioxidant properties of mustard (Brassica juncea). The ZnO NPs were characterized by UV-Vis spectrophotometry, Dynamic Light Scattering (DLS), X-ray diffractometer (XRD), Scanning Electron Microscopy (SEM), and Fourier Transform Infra-Red Spectroscopy (FTIR). Mustard plants were subjected to different concentrations of ZnONPs (0, 20, 40, 60, 80, 100 and 200 mg L-1) during the vegetative growth stage. The UV-Vis spectra of ZnO NPs revealed the absorption maxima at 362 nm and FTIR identified numerous functional groups that are responsible for capping and stabilizing ZnO NPs. DLS analysis presented monodispersed ZnO NPs of 84.5 nm size and highly negative zeta potential (-22.4 mV). Overall, the application of ZnO NPs enhanced the growth, chlorophyll content (by 53 %), relative water content (by 46 %), shoot biomass, membrane stability (by 54 %) and net photosynthesis significantly in a dose-dependent manner. In addition, the supplement of the ZnO NPs augmented K, Fe, Zn and flavonoid contents as well as overcome the effect of reactive oxygen species by increasing antioxidant capacity in mustard leaves up to 97 %. In conclusion, ZnO NPs can be potentially used as a plant growth stimulant and as a novel soil amendment for enhancing crop yields. Besides, the biofortification of B. juncea plants with ZnO NPs helps to improve the nutritional quality of the crop and perhaps potentiates its pharmaceutical effects.

Green Synthesized Silver Nanoparticle-Loaded Liposome-Based Nanoarchitectonics for Cancer Management: In Vitro Drug Release Analysis.

Silver nanoparticles act as antitumor agents because of their antiproliferative and apoptosis-inducing properties. The present study aims to develop silver nanoparticle-loaded liposomes for the effective management of cancer. Silver nanoparticle-encapsulated liposomes were prepared using the thin-film hydration method coupled with sonication. The prepared liposomes were characterized by DLS (Dynamic Light Scattering analysis), FESEM (Field Emission Scanning Electron Microscope), and FTIR (Fourier Transform Infrared spectroscopy). The in vitro drug release profile of the silver nanoparticle-loaded liposomes was carried out using the dialysis bag method and the drug release profile was validated using various mathematical models. A high encapsulation efficiency of silver nanoparticle-loaded liposome was observed (82.25%). A particle size and polydispersity index of 172.1 nm and 0.381, respectively, and the zeta potential of -21.5 mV were recorded. FESEM analysis revealed spherical-shaped nanoparticles in the size range of 80-97 nm. The in vitro drug release profile of the silver nanoparticle-loaded liposomes was carried out using the dialysis bag method in three different pHs: pH 5.5, pH 6.8, and pH 7.4. A high silver nanoparticle release was observed in pH 5.5 which corresponds to the mature endosomes of tumor cells; 73.32 ± 0.68% nanoparticle was released at 72 h in pH 5.5. Among the various mathematical models analyzed, the Higuchi model was the best-fitted model as there is the highest value of the correlation coefficient which confirms that the drug release follows the diffusion-controlled process. From the Korsmeyer-Peppas model, it was confirmed that the drug release is based on anomalous non-Fickian diffusion. The results indicate that the silver nanoparticle-loaded liposomes can be used as an efficient drug delivery carrier to target cancer cells of various types.

Direct Assessment of Oligomerization of Chemically Modified Peptides and Proteins in Formulations using DLS and DOSY-NMR.

Protein higher order structure (HOS) including the oligomer distribution can be critical for efficacy, safety and stability of drug products (DP). Oligomerization is particularly relevant to chemically modified protein therapeutics that have an extended pharmacokinetics profile. Therefore, the direct assessment of protein oligomerization in drug formulation is desired for quality assurance and control. Here, two non-invasive methods, dynamic light scattering (DLS) and diffusion ordered spectroscopy (DOSY) NMR, were applied to measure translational diffusion coefficients (Ddls and Dnmr) of proteins in formulated drug products. The hydrodynamic molecular weights (MWhd), similar to hydrodynamic size, of protein therapeutics were derived based on a log(Ddls) vs log(MWhd) correlation model established using protein standards. An exponent value of -0.40 ± 0.01 was established for DLS measured log(D) vs. log(MWhd) using protein standards and a theoretical exponent value of -0.6 was used for unstructured polyethylene glycol (PEG) chains. The analysis of DLS derived MWhd of the primary species showed the fatty acid linked glucagon-like peptide 1 (GLP-1) was in different oligomer states, but the fatty acid linked insulin and PEG linked proteins were in monomer states. Nevertheless, equilibrium and exchange between oligomers in formulations were universal and clearly evidenced from DOSY-NMR for all drugs except peginterferon alfa-2a. The correlation models of log(D) vs. log(MWhd) could be a quick and efficient way to predict MWhd of protein, which directly informs on the state of protein folding and oligomerization in formulation.

Fabrication of Magnetic Nanocomposites Using Natural Polymer Coating to Grain and Ciprofloxacin

In this study, we try to stabilize magnetic nanoparticles (Fe3O4) with natural granular polymer (granular mucilage as a natural, biocompatible and biodegradable coating) and then load the drug ciprofloxacin on these nanoparticles. Then, structural, magnetic, physicochemical, colloidal and antibacterial properties of the samples using various characterization tools and tests such as X-ray diffraction (XRD) analysis, transmission electron microscopy (TEM) analysis, FEE-SEM field scanning electron microscopy (SEM) Vibrating Sample Magnetometry (VSM), Infrared Fourier Analysis (FTIR), Optical Spectroscopy (UV-Vis), Dynamic Light Scattering (DLS), Nanoparticle Specific Surface (BET) and Testing The antibacterial property of disk diffusion must be investigated [21]. XRD results as well as structural analysis of the samples confirm the magnetite phase with high purity. The results of FE-SEM and TEM analyzes indicate spherical morphology and very small size of magnetite nanoparticles (average 13 nm). The results of DLS analysis show a hydrodynamic diameter of 81.9 to 119.2 nm for magnetic nanoparticles with different structures. Zeta potential values ​​for magnetic nanoparticles are between -0.28 and -55.2 mV, indicating suitable colloidal stability of the nanoparticles for biological applications. The VSM results indicate the high saturation magnetization of the samples as well as the small amounts of the forcing field and the residual magnetization of the samples, which indicates the superpromagnetic property of the nanoparticles.

Synthesis of nano-ZnO by chemical method and its characterization

Nanocrystals of ZnO were prepared by chemical method using Zn (II) acetate and potassium hydroxide as the starting materials and methanol as solvent. The material were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM), electron diffraction analysis (EDS), UV–Visible spectroscopy, Dynamic light scattering analysis (DLS) and Fourier transform spectroscopy (FTIR) techniques. The resultant results indicated that the obtained ZnO material was in nano-dimension and possess pure wurtzite hexagonal phase.

Phytoconstituents mediated fabrication of palladium nanoparticles using Butea Monosperma flower extract by autoclaving treatment towards the degradation of noxious organic dyes

The effluents of industrial wastes contain a number of dyes and pigments that have been found to be extremely harmful to the environment and pose a threat to human existence. The fabrication of palladium nanoparticles (PdNPs) employing aqueous extract of the seasonal flower Butea Monosperma (BM) to work as reducing, capping, and stabilizing agents in a convenient, one-step method by autoclaving method is presented in the current study. UV–Visible spectroscopy, FT-IR, XRD, DLS, and TEM analyses were used to evaluate the phytoconstituents fabricated PdNPs. The synthesis of PdNPs and the catalytic discoloration of toxic chemical dyes are both detectable using optical absorption spectroscopy. The functional groups responsible for reducing and anchoring the PdNPs contained in the extract were detected using FTIR. The powder XRD pattern reveals that the particles in the FCC structure are crystalline and spherical, and that they are stable according to Dynamic Light Scattering (DLS). According to TEM analysis, PdNPs have crystallite sizes that vary from 3 to 8 nm on average. In excess sodium borohydride (SBH), the PdNPs showed excellent catalytic activity in the degradation of organic dyes like Methylene Blue (MB), Methyl Orange (MO), Crystal Violet (CV), and Methyl Red (MR), with apparent reduction rates of 0.56 min−1, 0.45 min−1, 0.40 min−1, and 0.39 min−1, respectively. The kinetic studies show that the degradation rate appears to follow pseudo-first order kinetics. The current study offers a successful strategy for the widespread green biosynthesis of PdNPs for possible catalytic applications.

Carbon Quantum dots doped Chitosan/HPMC nano composites and their Functional, Structural, Morphological, Dielectric and Tensile properties

Carbon Quantum Dots (CQDs) were prepared from modified hydrothermal method using Citric acid and ethane diamine as a source material. The synthesized CQDs were characterized by UV-Vis spectroscopy, Fluorescence Studies (FL), Atomic force microscopy (AFM). The particle size is conformed from Dynamic Light Scattering (DLS) analysis. The synthesized CQDs were doped in polymer blend with various weight percentages and the further characterizations were carried out for X-Ray Diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), dielectric properties, and tensile properties at room temperature and higher temperatures with the help of Universal Testing Mission (UTM). The dielectric behavior of Chitosan/HPMC/CQDs polymer nanocomposites (PNCs) were studied in the range of 50 Hz to 5 MHz frequency and the temperature ranging from 30-100 °C, using LCR meter. The dielectric constant (ε'), dielectric loss (ε') are found with different wt% of CQDs in the PNCs.

Protecting mechanism of Swietenia macrophylla ethanol extract nanoparticle on streptozotocin induced renal damage in rat.

Hyperglycemia increases reactive oxygen species (ROS), which contributes to diabetic complications such as kidney cell damage. Antioxidant administration could inhibit ROS and kidney cell damage commonly seen in hyperglycemia. We want to demonstrate that the antioxidant properties of Swietenia macrophylla ethanol extract nanoparticles can prevent kidney cell damage brought on by streptozotocin (STZ) in the current investigation. This study employs high-energy ball milling to produce nanoparticles from S. macrophylla extract. Additionally, dynamic light scattering (DLS) is utilized to characterize the nanoparticle sizes of the S. macrophylla ethanol extract. Five groups, each consisting of 8 rats, were formed from 40 rats. Control rats received distilled water, the diabetic rats were administered STZ injections, while S. macrophylla rats were given S. macrophylla extract nanoparticles orally and STZ injection. After the trial, blood from a rat was drawn intracardially to check the levels of blood urea nitrogen (BUN) and creatinine. The levels of superoxide dismutase (SOD), glutathione peroxidase (GPx), and malondialdehyde (MDA) were then assessed in kidney tissue samples. Histological alterations were evaluated in kidney section samples. A DLS analysis estimated the size of the S. macrophylla ethanol extract nanoparticles to be about 91.50 ± 23.06 nm. BUN and creatinine levels were significantly raised after STZ treatment. STZ significantly decreased SOD and GPx levels in kidney tissue while raising MDA levels (p < 0.05). Swietenia macrophylla ethanol extract nanoparticle caused the decreased levels of BUN and creatinine in blood to normal levels (p < 0.05), indicating that S. macrophylla ethanol extract prevented the STZ-induced kidney cell damage. Additionally, S. macrophylla nanoparticles significantly raise GPx and SOD levels in kidney tissue while lowering MDA levels (p < 0.05). These actions are thought to have prevented kidney histological alterations (degeneration and necrosis) in diabetic rats. According to these results, the anti-oxidative stress properties of S. macrophylla nanoparticles make them potentially effective nephroprotective therapies for STZ-induced kidney cell damage.

A thermally robust method of sample sealing for capillary DLS

Capillary Dynamic Light Scattering (DLS), has recently been introduced as a simple and enabling technique that increases the measurement range of traditional DLS analysis with minimized sample volumes (Ruseva et al., 2018). The previously published protocol for the preparation of samples for analysis within a capillary called for sealing of the capillary end using a clay compound (Ruseva et al., 2019). This material is not, however, compatible with organic solvents, nor with elevated sample temperatures. To extend the uses of capillary DLS to more complex assays like thermal aggregation studies, a new sealing method is demonstrated using a UV curing compound. This further motivates the use of capillary DLS to minimize volumes of destroyed precious samples in pharmaceutical development assays to study thermal kinetics.•Use of UV curing compound to seal capillaries used in DLS to preserve low volumes of sample.