EVALUATION OF ANTIMICROBIAL ACTIVITY OF GREEN-SYNTHESIZED MANGANESE OXIDE NANOPARTICLES AND COMPARATIVE STUDIES WITH CURCUMINANILINE FUNCTIONALIZED NANOFORM

ABSTRACTObjective: Metal oxide nanoparticles are widely attracted researchers due to their potential applications in a variety of fields, especially medicinalimportance. It has been shown that biofunctionalization of metal nanoparticles with the specified bioactive materials produces the significantlyimproved bioactive materials with the essential biological properties and advanced features. According to the reports, manganese oxide nanoparticles(MONPs) possess highly magnetic properties leads to develop for use in research and biomedical applications. In this evaluation, we focused on thesynthesis of MONPs through a green methodology and their antimicrobial activity changes when functionalized with curcuminaniline derived fromturmeric plants.Methods: First, curcumin has been isolated from turmeric plant (BSR-01) to synthesize curcuminaniline biomaterial. On the other hand, manganesenanoparticles are synthesized by the green synthesis method using lemon extract and curcumin. Finally, the synthesized curcuminaniline isfunctionalized with MONPs. The synthesized nanoparticles are characterized by ultraviolet-visible, Fourier transform infrared, scanning electronmicroscope and transmission electron microscopy techniques. The antimicrobial activity of the obtained nonfunctionalized and biofunctionalizednanoforms are tested against some Gram-negative and Gram-positive bacterial strains as well as fungal strains.Results: The morphological studies represented that MONPs are of eclipsed and spherical morphology with size about 50±5 nm and biofunctionalizednanoparticles are of spherical morphology with size about 50±10 nm. The antibacterial and antifungal tests revealed that biofunctionalized MONPsare exhibited significantly higher antimicrobial activity.Conclusion: This investigation clearly demonstrated that MONPs are shown significantly higher biocidal activity when biofunctionalized withmodified curcumin material. This may help in the future medicinal and pharmaceutical industries to develop new inventions.Keywords: Green synthesis, Nanoparticles, Curcumin, Curcuminaniline, Soxhlet extraction, Antimicrobial activity

Facile green synthesis of iron nanoparticles using natural reducer and stabilizer and an evaluation of antimicrobial activity

ABSTRACT In the present work Iron nanoparticles have been synthesized from simple and green synthesis strategy. Natural lemon extract was used as a reducing agent and curcumin acted as a stabilizer. The obtained iron nanoparticles were characterized by UV-Vis, IR, SEM and TEM techniques. TEM images showed that the formed particles are of spherical morphology with appreciable size. The synthesized iron nanoparticles have been screened for their antibacterial and antifungal activities against different microorganisms. The zone of inhibition results were considerably higher andalso exhibited similar activity to standard drugs

Growth and Characterization of Organic Marine Dye Compound: 6-Amino-8α-methoxy-5-methyl-4,7-dioxo-1,1a, 2,4,7,8,8a,8b-octahydroazireno[2',3':3,4] pyrrolo[1,2-α]indol- 8-yl]methyl Carbamate

Single crystals of 6-amino-8α-methoxy-5-methyl-4,7-dioxo-1,1a, 2,4,7,8,8a,8b-octahydroazireno[2',3':3,4]pyrrolo[1,2-α]indol-8-yl]methyl carbamate (Mitomycin), an organic marine dye material has been grown from solution by slow evaporation at ambient temperature. The growth of crystals has been carried out at various pH values and the growth was confirmed at pH 6. The chemical composition of the grown crystals was determined by the FTIR spectra. The crystalline nature and its various planes of reflections were observed by the powder XRD. The grain size is found to be 500 microns using SEM studies and the NLO activity of the grown crystal has been checked by second harmonic generation (SHG) test

Electric and Dielectric Properties of Au/ZnS-PVA/n-Si (MPS) Structures in the Frequency Range of 10-200 kHz

WOS: 000403016800064Pure polyvinyl alcohol (PVA) capped ZnS semiconductor nanocrystals were prepared by microwave-assisted method, and the optical and structural properties of the as-prepared materials were characterized by x-ray diffraction (XRD) and Ultraviolet-visible (UV-Vis) techniques. The XRD pattern shows the formation of ZnS nanocrystals, and the UV-Vis spectroscopy results show a blue shift of about 1.2 eV in its band gap due to the confinement of very small nanostructures. The concentration of donor atoms (N (D)), diffusion potential (V (D)), Fermi energy level (E (F)), and barrier height (I broken vertical bar(B) (C-V)) values were obtained from the reverse bias C (-2)-V plots for each frequency. The voltage dependent profile of series resistance (R (s)) and surface states (N (ss)) were also obtained using admittance and low-high frequency methods, respectively. R (s)-V and N (ss)-V plots both have distinctive peaks in the depletion region due to the spatial distribution charge at the surface states. The effect of R (s) and interfacial layer on the C-V and G/omega-V characteristics was found remarkable at high frequencies. Therefore, the high frequency C-V and G/omega-V plots were corrected to eliminate the effect of R (s). The real and imaginary parts of dielectric constant (epsilon' and epsilon aEuro(3)) and electric modulus (M' and MaEuro(3)), loss tangent (tan delta), and ac electrical conductivity (sigma (ac)) were also obtained using C and G/omega data and it was found that these parameters are indeed strong functions of frequency and applied bias voltage. Experimental results confirmed that the N (ss), R (s) , and interfacial layer of the MPS structure are important parameters that strongly influence both the electrical and dielectric properties. The low values of N (ss) (similar to 10(9) eV(-1) cm(-2)) and the value of dielectric constant (epsilon' = 1.3) of ZnS-PVA interfacial layer even at 10 kHz are very suitable for electronic devices when compared with the SiO2. These results confirmed that the ZnS-PVA considerably improves the performance of Au/n-Si (MS) structure and also allow it to work as a capacitor, which stores electric charges or energy