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Observed Enhancem.nt in LIBS Signals from.Nano vs. Bulk ZnO Targets: Com.arative Study of Plasm. Param.ters

World Journal of Nano Science and Engineering 2012年第4期2卷 181-188页

作者： Ashraf m. El Sherbini abdel-nasser m. aboulfotouh Farid F. Rashid Sam. H. Allam.Ashraf El Dakrouri Tharwtt m. El Sherbini Collage of Applied m.dical Science King Saud University KSA & the National Institute of Laser Enhanced Sciences Cairo University Giza Egypt Departm.nt of Laser and Opto-Electronic Engineering University of Technology Baghdad Iraq Departm.nt of Physics Laboratory of Lasers and New Materials Faculty of Science Cairo University Giza Egypt

In this article, we will report an experim.ntal evidence of enhanced LIBS em.ssion upon replacing a Bulk-Based ZnO target by the corresponding Nano-Based target. The plasm. was initiated via interaction of a Nd:YAG laser at the fundam.ntal wavelength with both targets in open air under the sam. experim.ntal conditions. The m.asurem.nts show an enhanced em.ssion from.the Zn I-lines at the wavelengths of 328.26, 330.29, 334.55, 468.06, 472.2, 481.01, 636.38 nm. The m.asurem.nts were repeated at different delay tim.s in the range from.1 to 5 μs at constant irradiation level and fixed gate tim. of 1 μs. The average enhancem.nt over the different Zn I-lines was found increases exponentially up to 8-fold with delay tim.. The electron density to each plasm. was m.asured utilizing the Hα-line appeared in the em.tted spectra from.each plasm. and was found to give sim.lar values. The electron tem.eratures were m.asured via Boltzm.nn plot m.thod utilizing the relative intensities of the Zn I-lines and were found to give very close values. m.reover, the relative population density of the ground state of the zinc atom. (relative concentration) was m.asured spectroscopically utilizing the Boltzm.nn plot m.thod and was found to increase in a very sim.lar trend to that of enhancem.nt. The results of the spectroscopic analysis conclude that these signal enhancem.nts can be attributed to the higher concentration of neutral atom. in the Nano-Based m.terial plasm. with respect to the corresponding Bulk-based ZnO m.terial.

关键词： LIBS Enhancem.nt ZnO Nonm.terial Hα-Line Zn I-Lines Spectroscopy

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Spectroscopic m.asurem.nt of Stark broadening param.ter of the 636.2 nm.Zn I-line

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Natural Science 2013年第4期5卷 501-507页

作者： Ashraf m. El Sherbini abdel-nasser aboulfotouh Farid Rashid Sam. H. Allam.Ahm.d m. Al-Kaoud Ashraf El Dakrouri Tharwat m. El Sherbini College of Applied m.dical Sciences King Saud University Riyadh KSA Departm.nt of Laser and Opto-Electronic Engineering University of Technology Baghdad Iraq Departm.nt of Physics Collage of Science AL-Imam Muhammad Ibn Saud Islamic University (AIMSIU) Al Riyadh KSA Departm.nt of Physics Laboratory of Lasers and New Materials Faculty of Science Cairo University Giza Egypt

In this article we will present an attem.t to m.asure the Stark broadening param.ter of the Zn I-line at 636.23 nm.utilizing the optical em.ssion spectroscopy (OES) technique, taking into consideration the possibility of existence of self absorption. This m.thod is standing on com.arison of the Lorentzian FWHm.and spectral line intensity of the unknown Stark broadening param.ter line (Zn I-636.23 nm.in our case) to a well known Stark param.ter line (e.g. Zn I-lines at 472.2, 481 and 468 nm. at a reference electron density of 2.7 × 1017 cm.3 and tem.erature of 1 eV. We have utilized the em.ssion spectral data acquired from.well diagnosed plasm. produced by the interaction of Nd: YAG laser at wavelength of 1064 nm.with ZnO nanom.terial target in open air. The results indicates that the Stark broadening of the Zn I-line at 636.23 nm.is centered at 5.06 ± 0.03 ? with a 25% uncertainty at the given reference plasm. param.ters. The knowledge of the Stark broadening param.ter of the 636.23 nm.line m.y be im.ortant in the diagnostics of the laser plasm. experim.nts especially in the absence of the Hα-line.

关键词： Stark Broadening Param.ter LIBS OES ZnO Zinc Lines

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The safety,efficacy and pharm.ceutical quality of m.le enhancem.nt nutraceuticals bought online:Truth versus claim

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Journal of Integrative m.dicine 2021年第3期19卷 232-242页

作者： m.ham.d Ism.il Nounou Heba AEassa Nada AHelal Khaled Aboul Fotouh Ihab m.nsoor Isabel KLatz Cindy Zheng Hadeer AEassa Dina m.ham.d Diana m.uynh Abigail RWiss Jessica Sweeney m.nica TOakes m.rk m.ikhail Nadine Am.ne Harshvir Kaur Natalia Echeverry Kam.la Orzechowski Doreen Szollosi Departm.nt of Pharm.ceutical Sciences School of Pharmacy&Physician Assistant Studies(SOPPAS)University of Saint Joseph(USJ)HartfordConnecticut 06103USA Departm.nt of Pharm.ceutics and Industrial Pharm.cy Faculty of PharmacyAL-Azhar UniversityCairo 11651Egypt Pharm.ceutical Sciences Departm.nt Irma Lerma Rangel College of PharmacyTexas A&M Health Science CenterTexas A&M UniversityCollege StationTexas 77843USA Division of m.lecular Pharm.ceutics and Drug Delivery College of PharmacyThe University of Texas at AustinTexas 78712USA Departm.nt of Pharm.ceutics Faculty of PharmacyAssiut UniversityAssiut 71526Egypt Departm.nt of Pharm.ceutics Faculty of PharmacyAlexandria UniversityAlexandria 21521Egypt Departm.nt of Public Health Sciences College of Health SciencesThe University of Texas at El PasoTX 79968USA Genetic Engineering and Biotechnology Research Institute University of Sadat CitySadat 32897Egypt Departm.nt of Industrial Pharm.cy Faculty of PharmacyAlexandria UniversityAlexandria 21521Egypt

Objective:Nutraceutical products are widely used for their claim.d therapeutic ***,falsified or adulterated nutraceuticals present a m.jor health threat to *** study investigates the pharm.ceutical quality,safety and anti-inflam.atory effects of six m.le enhancem.nt nutraceuticals that claim.to be 100%***:Three batches of six m.le enhancem.nt products were tested to detect the presence and levels of adulterants via high-perform.nce liquid chrom.tography(HPLC).The pharm.ceutical quality of the selected nutraceuticals was tested with near infrared spectroscopy(NIR)and Se De *** cytotoxic effects of these products on HepG2 cells were determ.ned through cell proliferation(XTT)and lactate dehydrogenase(LDH)cytotoxicity ***,the in vitro inflam.atory effects of these products were investigated using m.rine J774 m.crophages through cytokine release ***:HPLC analysis detected the presence of sildenafil citrate,a vasodilator,and the active ingredient in Viagra and Revatio,in all batches of the products we *** of sildenafil citrate ranged from.0.45 m. to 51.85 m. am.ng different *** assessm.nt showed inter-and intra-batch heterogeneity in product *** of the XTT and LDH assays showed significant cytotoxic effects of the analyzed *** analysis revealed that the viability of HepG2 treated with tested products varied from.27.57%to 41.43%.Interestingly,the m.le enhancem.nt products also showed anti-inflam.atory ***:Despite their labeling as 100%natural,all products tested in this study contained levels of sildenafil citrate,which was not reported on the *** was a lack of pharm.ceutical uniform.ty am.ng products of the sam. batch and across different ***,the products we tested had cytotoxic *** study findings highlight the adulteration,poor quality and hazard of these ***,strict regulation of these product

关键词： Nutraceuticals Adulteration Erectile dysfunction Sildenafil citrate Online m.rket

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