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Synthesis and Characterization of Chitosan Nanoparticles Loaded Botanical Extracts with Antifungal Activity on Colletotrichum gloeosporioides and Alternaria species

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Advances in Microbiology 2018年第4期8卷 286-296页

作者： Laura Leticia Barrera-Necha zormy nacary correa-pacheco Silvia Bautista-Banos Mónica Hernández-López Jorge Eduardo Martínez Jiménez Aime Frida Morán Mejía Instituto Politécnico Nacional Centro de Desarrollo de Productos Bióticos MorelosMéxico

In this study, chitosan nanoparticles (CSNPs) and chitosan nanoparticles- botanical extracts: EEA-CSNPs (ethanolic blueberry extract added chitosan nano-particles) and EMN-CSNPs (extract methanol of nanche added chitosan nano-particles) were characterized and evaluated in vitro ongrowth of Alternaria alternata isolated from Fig and Rosemary and Colletotrichum gloeosporioides isolated from Papaya and Soursop. From particle size distribution characteriza-tion, the size of nanoparticles increased after EEA incorporation. On the other hand, the smallest value of Z-average particle size was for the EMN-CSNPs. Zeta potential value decreased for CSNPs and EEA-CSNPs. However, when EMN is incorporated to CSNPs, the value is increased. From the results, it can be seen that the most stable suspension was EMN-CSNPs. After incorporation of Byrsonima crassifolia to CSNPs, no changes were observed in characteristic absorption bands for the FTIR spectra. However, after Vaccinium corymbosum incorporation to the CSNPs, changes were seen. For in vitro evaluation, CSNPs without EEA caused the total germination and sporulation inhibition of A. alternata from Rosemary. Incorporation of EMN to CSNPs improved the control of C. gloeosporioides with amycelial growth inhibition of 79% isolated from papaya and 82% isolated from soursop. In both isolated there were total germination inhibition. Overall, a synergistic effect between the chitosan and EMN was observed.

关键词： Zeta Potential In Vitro Fungi Blueberry Nanche

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Nonlinear Coefficient Determination of Au/Pd Bimetallic Nanoparticles Using Z-Scan

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Advances in Nanoparticles 2013年第3期2卷 223-228页

作者： José Luis Jiménez Pérez Rubén Gutiérrez-Fuentes José Francisco Sánchez Ramírez Omar Uriel García Vidal Daniel Erick Téllez-Sánchez Zormy Nacary Correa Pacheco Alfredo Cruz Orea Jesús Antonio Fuentes García Centro de Investigación en Ciencia Aplicada y Tecnología Avanzada México D.F. México Departamento de Física Centro de Investigación y de Estudios Avanzados del Instituto Politécnico Nacional México D.F. México Unidad Profesional Interdisciplinaria en Ingeniería y Tecnologías Avanzadas del IPN México D.F. México

In this paper we present the nonlinear optical characterization of Au/Pd nanoparticles in order to obtain the nonlinear refractive indices using the Z-scan technique. The experiments were performed using a 514 nm laser beam Ar+, with 14 Hz of modulation frequency, as excitation source. By using a lens the excitation beam was focused to a small spot and the sample was moved across the focal region along the z-axis by a motorized translation stage. Seven samples with different concentration ratio of Au/Pd nanoparticles were prepared by simultaneous reduction of gold and palladium ions in presence of poly (N-vinyl-2-pirrolidone) (PVP) using ethanol as a reducing agent. In this work, we report the application of the Z-scan technique, to generate optical transmission of laser light as a function of the z position for solutions containing bimetallic nanoparticles of Au (core)/Pd (shell) with average sizes ranging from 3 to 5 nm. The magnitude of the obtained nonlinear refractive index was in the order of 10?8 cm2/W. Our results show that the nonlinear refractive index has a nonlinear behavior when the (Au/Pd) ratio was increased.

关键词： Nanofluids Nanoparticles Nonlinear Refractive Indices Z-Scan

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