SYNTHESIS OF SILVER NANOPARTICLES FROM ETHANOL AND AQUEOUS EXTRACT OF LEAVES AND PETALS OF HIBISCUS ROSA-SINENSIS L.

• Author
• Sayes Reátegui, Carolina G.
• Co-authors
• Herrera Hernández, Nora G. , Huarote, E.
• Abstract

•  

  of nanoparticles from plant extracts has become an interesting line in recent years due to properties antimicrobial, antibacterial and insecticide. It is considered a green technology because it is profitable, safe, non-toxic and eco-friendly. The present study proposes to synthesis of silver nanoparticles (SNP) using extracts of flower petals and leaves of The synthesis Hibiscus rosa-sinensis L. By extraction method ultrasound-assisted were obtained aqueous extracts and 80% ethanolic of flower petals and leaves of Hibiscus rosa sinensis L. The formation of the nanoparticles was identified by the color change that occurred between of silver nitrate solution and each of the vegetable extracts (aqueous and ethanolic) with different pH (7, 9, 11, 13). The analysis of H. rosa-sinensis L. petals ethanolic extract was performed in the Natural Products Laboratory of The University of Antofagasta, Chile, by the UHPLC-ESI-Q-Orbitrap-MS / MS equip, where identified for molecular weight: pelargonidine, petunidine, kaempferol, luteolin, orientine and citric acid. The characterization of the silver nanoparticles was confirmed by UV-Visible Spectrophotometry, Fourier Transform Infrared Spectroscopy (FTIR), Dynamic Light Scattering (DLS), Field Emission Scanning Electron Microscopy (FE-SEM) and Energy Dispersive Spectroscopy (EDS).  Spectrophotometric analysis, the ethanolic and aqueous solution exhibited a strong absorption (surface plasmon): ethanolic extract of leaves and flower petals (389,411 nm and 400,631 nm), and aqueous extract of leaves and flower petals (391,057 nm and 402,270 nm), characteristic of silver nanoparticles. FTIR analysis evidenced the groups functional of organics molecule presents in the ethanolic and aqueous extract responsible for reduction ions Ag ⁺ to Ag °, in synthesized silver nanoparticles. DLS analysis showed an effective diameter less than 80 nm and polydispersity close to zero (0.270 – 0.386). FE-SEM analysis showed a particle size between 17-32 nm and a spherical structure. Finally, the EDS analysis corroborated the elemental composition of the nanoparticles obtained: silver (majority compound), oxygen and potassium. This study revealed that the compounds from Hibiscus rosa-sinensis L. extracts are good reducing and stabilizing agents for the synthesis of silver nanoparticles in pH 9.

• Keywords
• Green synthesis, Hibiscus rosa-sinensis, FE-SEM, UHPLC, silver nanoparticles.
• Modality
• Pôster
• Subject Area
• Química de Produtos Naturais

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