2,859 publications from this institution
Purpose Synthesis and evaluation of new naphthopyran and related compounds as ultraviolet absorbers. Design/methodology/approach The new naphthopyran and related compounds were prepared using new synthesis methodology which gave new derivatives via positions not accessible by traditional methods. Findings A new method for the preparations of naphthopyran was developed. The naphthopyran compounds prepared had promising UV absorption/protection capabilities. Practical implications The new compounds synthesised had unique character enabling them to be used in applications such as UV absorber and sunscreen. Originality/value New method of synthesis and the possibility of using the naphthopyran derivatives as UV absorber in many applications.
Chalcone derivatives have been synthesized by the reaction of 3-acetyl-2,5-dimethylthiophene with corresponding active aldehyde in ethanolic NaOH in microwave oven. The structure of these compounds was established by elemental analysis, IR, 1H NMR, 13C NMR and EI-MS spectral analysis. The anti-bacterial activity of these compounds were first tested in vitro by the disk diffusion assay against two Gram-positive and two Gram-negative bacteria, and then the minimum inhibitory concentration (MIC) was determined with the reference of standard drug Chloramphenicol. The results showed that compound 8 is a better inhibitor of both types of the bacteria (Gram-positive and Gram-negative) as compared to chloramphenicol.
Abstract In this study, we reported electrochemical synthesis of conductive polypyrrole‐chitosan (PPY‐CHI) thin film for sensitive detection of sulfite in real samples. The synthesized PPY‐CHI film was characterized in terms of surface morphology, optical property, binding energy, conductivity and electrochemical properties. The synthesized copolymeric PPY‐CHI film displayed good electrocatalytic behaviour towards oxidation of sulfite. The synthesized PPY‐CHI film was used for sulfite detection using differential pulse voltammetric technique with detection limit, sensitivity and linearity of 0.21 μM (S/N=3), 15.28 μA μM cm −2 and 50–1100 μM respectively. In addition, the current responses of PPY‐CHI film towards sulfite were repeatable, reproducible response and unaffected by selected electroactive interferents. Finally, the synthesized PPY‐CHI was successfully and satisfactorily applied for determination of sulfite in real food and biological samples. The results obtained from this study highly placed PPY‐CHI film as a promising sensor for sensitive and accurate detection of sulfite in food and biological samples for human health protection.
In this communication, cobalt phosphide nanoparticles film was developed on carbon cloth (CoP NPs/CC) through low-temperature phosphidation of its corresponding Co NPs/CC precursor. When directly used as a cathode for electrochemical hydrogen evolution in strongly acidic solutions, the CoP NPs/CC electrode exhibits high performance with a low onset overpotential of 33 mV, a Tafel slope of 70 mV dec−1 and a Faradaic efficiency of nearly 100%. This catalyst maintain its catalytic activity for at least 30 h and only needs overpotentials of 48 and 190 mV to attain current densities of 10 and 100 mA cm−2, respectively.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
An entry from the Cambridge Structural Database, the world’s repository for small molecule crystal structures. The entry contains experimental data from a crystal diffraction study. The deposited dataset for this entry is freely available from the CCDC and typically includes 3D coordinates, cell parameters, space group, experimental conditions and quality measures.
Polyvinyl chloride/mixed graphene-carbon nanotube nanocomposites have been fabricated in the form of (PVC/MG-CNTs a-e ) via simple dissolution method with the help of ultrasonic assistance. First, mixed G:CNTs ratio (50:50) wt by wt was prepared. Then, different loadings of that mixed G/CNTs ratio (2, 5, 10, 20, and 30 wt %) were added to the PVC polymer matrix. The fabricated PVC/MG-CNTs a-e nanocomposites were characterized by different techniques including: FT-IR, XRD, SEM, TEM and thermal analyses. The perception found in the FT-IR results of PVC nanocomposites confirm the introduction of mixed G/CNTs nanoparticles in the PVC polymer matrix. The mixed G/CNTs were stimulated in highly regular order in the PVC film and its crystallinity was significantly improved. The thermal property of pure PVC polymer matrix was noted to be highly improved by combining the mixed G/CNTs in the form of nanocomposites. CDT max for all the samples were nearly similar and appeared in the same range of 270–305℃. Here, a potential Ag + ionic sensor has been fabricated based on the glassy carbon electrode coated by PVC/MG-CNT NCs to make a thin layer as working electrode probe. The slope of the calibration curve plotted as current versus the concentration of Ag + ion was used to calculate the sensitivity (6.4241 µAµM −1 cm −2 ) by considering the active surface area of the sensor probe. The current observation based on Ag + ionic concentration is found to be linear over the linear dynamic range, where the detection limit (DL = 14.78 ± 0.74 pM) is measured by considering the signal to noise ratio at 3. Considering the application feature of Ag + ion sensor, the proposed sensor was demonstrated to have good reproducibility and reliability for the sensor application through the determination of toxins in environmental and healthcare fields at broad scales.
In the title compound, C(17)H(12)O(3), each of the five-membered rings in the inden-1-one and 1,3-benzodioxole residues is almost planar (r.m.s. deviations = 0.041 and 0.033 Å, respectively). A small twist about the single bond linking the two residues is evident [the C-C-C-C torsion angle = 8.7 (4)°]. Supra-molecular zigzag layers propagating in the ac plane are formed in the crystal via C-H⋯O inter-actions. The layers are linked via π-π inter-actions between the five- and six-membered rings of 1,3-benzodioxole residues [centroid-centroid distance = 3.4977 (14) Å].
A Cu nanoparticle-embedded N-doped carbon nanowire array on copper foam (Cu–N–C NA/CF) shows high catalytic activity, needing an overpotential of 314 mV to drive a geometrical current density of 20 mA cm<sup>−2</sup> in 1.0 M KOH.
Abstract Herein, we investigated the micelle formation of mixed systems of the antipsychotic drug, chlorpromazine hydrochloride (CPZ), and the bile salt, sodium deoxycholate (NaDC), both in the absence and presence of NaCl by tensiometry. To understand the aggregation behaviour of the mixture of these two amphiphiles, we calculated various micellar and interfacial parameters using the theories of Clint, Rubingh, Rosen and Motomura. The calculated interaction parameters indicate an attractive interaction between the two amphiphiles both in the absence and presence of salt. The results were discussed with regard to the use of bile salt as a promising drug carrier for CPZ and the improvement of its bioavailability.
