Carlos A Malca Reyes; Ermides Chavez Baldovino; Marielys Torres Diaz; Lisby F Santiago-Pagan; Peter Feng; Claudia P Ruiz-Diaz; Carlos Toledo-Hernandez; Kai Griebenow; Liz M. Diaz Vazquez
Abstract
The environmental fate and biological effects of nanomaterials in marine ecosystems are of increasing concern, yet monitoring techniques remain limited. This study explores alternative methods to evaluate the influence of Gold Nanoparticles (AuNPs) on corals using Gorgonia ventalina as a model organism. ...
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The environmental fate and biological effects of nanomaterials in marine ecosystems are of increasing concern, yet monitoring techniques remain limited. This study explores alternative methods to evaluate the influence of Gold Nanoparticles (AuNPs) on corals using Gorgonia ventalina as a model organism. Through energy dispersive X-ray spectroscopy (EDAX), we traced AuNP accumulation within coral tissues. Raman spectroscopy revealed an elevation in polyene content, signifying a stress response attributable to nanoparticle exposure. Furthermore, Fourier transform infrared spectroscopy demonstrated a reduction in calcium levels, while the Bradford assay indicated a decrease in protein concentration, suggesting a disruption in the calcification process vital to coral health. These findings highlight the utility of these alternative analytical techniques in providing comprehensive insights into the effects of nanomaterials on corals. The integration of these methods offers a more robust framework for environmental monitoring, with the potential to inform conservation strategies for marine ecosystems amid growing nanoparticle usegoogle is broken
Shirish Sadashiv Pingale; Shobha Vasant Rupanar; Manohar Chaskar
Abstract
The present study reports one step green synthesis of silver nanoparticles using Gymnema sylvestre aqueous extract at room temperature and their usage in the photodegradation of methyl orange dye. The silver nanoparticles are synthesized using an aqueous extract of stem and root of Gymnema sylvestre. ...
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The present study reports one step green synthesis of silver nanoparticles using Gymnema sylvestre aqueous extract at room temperature and their usage in the photodegradation of methyl orange dye. The silver nanoparticles are synthesized using an aqueous extract of stem and root of Gymnema sylvestre. UV-Visible spectral analysis showed absorbance peak at 430 nm with special reference to the excitation of surfaces plasmon vibration by silver nanoparticles. FT-IR analysis of nanoparticles reveals the presence of molecular functional groups such as amides, phenolic compounds, and carboxylic acid. These phytochemicals act capping and stabilizing agents for silver nanoparticles. EDAX elemental analysis shows the presence of silver as the main element in synthesized nanoparticles. The average crystalline size of silver nanoparticles was found to be 25.3 nm and 9.97 nm for Stem-AgNPs and Root-AgNPs respectively by Scherer formula. XRD patterns also suggest the occurrence of crystalline silver ions. Further, photocatalytic degradation of methyl orange was measured spectrophotometrically by using silver nanoparticles as nanocatalyst under solar light effect. The results revealed that biosynthesized silver nanoparticles using G. sylvestyre was found to be notable in degrading methyl orange dye under the influence of sunlight.
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