@article {1238, title = {Facile Synthesis Photochemical, Dye Degradation and Ecotoxicological Properties of Silver Nanoparticles Using Sansevieria angolensis Bojer Ex. Hook Plant Extract}, journal = {Pharmacognosy Research}, volume = {16}, year = {2024}, month = {April 2024}, pages = {305-314}, type = {Original Article}, chapter = {305}, abstract = {

Background: It has been found in recent years that metallic nanoparticles can have significant impacts in various fields because of their low cost, ease of synthesis, and environmental friendliness. Objectives: This study focuses on eco-friendly silver nanoparticles synthesis using Sansevieria angolensis as catalyst. Materials and Methods: Synthesized silver nanoparticles were characterized by UV, FTIR, XRD, SEM and EDX studies. Three different organic dyes as crystal violet, coomassie blue and congo red the photocatalytic dye degrading capacity of synthesized nanomaterials was evaluated. Earthworm mortality rate with nanomaterial exposure was done to ensure that the SASNPs (Sansevieria angolensis Silver Nanoparticles) are non-hazardous to the environment. Results: The present study green synthesized NPs were characterized with absorption range above 250 nm, particle size ranging from 40-50 nm and the presence of 1.5 mg of silver per kg. This study focuses on the rapid effect of SASNPs in degrading crystal violet, congo red and coomassie blue dyes in the presence of light. The heavy metal accumulation was measured in SASNPs indicated a 1.5 ppm build-up and ecotoxicology of NPs by using earthworm mortality rate of earthworm is observed to be as 0.3333{\textpm}0.333 in the lowest concentration of 25 mg/100 mL. Conclusion: Amidst of numerous metals used to synthesize nanoparticles, silver-based nanoparticles synthesis is prominent as silver is essential for all living organisms. This study reveals that the biogenic synthesis of NPs showed low ecotoxicity on earthworm Eisenia fetida.

}, keywords = {Eco-friendly synthesis, Non-hazardous, Photochemical dye degradation, Sansevieria angolensis, Silver nanoparticles.}, doi = {10.5530/pres.16.2.39}, author = {Manoharan Laxmi Kiruthika and Ammasaikutty Vanitha and Kandasamy Kalimuthu} } @article {1225, title = {Preparation and Characterization of Bio-nanocomposite Films, Incorporated with Silver Nanoparticles}, journal = {Pharmacognosy Research}, volume = {16}, year = {2024}, month = {April 2024}, pages = {230-235}, type = {Original Article}, chapter = {230}, abstract = {

Background: The present work was conceded to know the improved and comparable properties with bio-nanocomposite films. The films were prepared by using blends of Carboxy Methyl Cellulose (CMC), a cellulose derivative; pectin by wet casting was used to create the films with incorporation of silver nanoparticles that had been produced. Materials and Methods: The silver Nanoparticles (AgNP{\textquoteright}s) were synthesized by eco-friendly method by using Psidium guajava leaf extract. Incorporation of AgNP{\textquoteright}s into CMC and pectin films (bio-nanocomposite films) was characterized by SEM. Also its mechanical properties, WVTR activity and anti- microbial studies were carried out in the present work. Results: SEM results have shown that formation of spherical shaped nanoparticles which is Ag nanoparticles coated bio-nanocomposite films. According to the WVTR results, adding more AgNP{\textquoteright}s to films decreased their humidity and ability of water absorption. The mechanical properties of the films were improved. The films showed remarkable antibacterial activity against E. coli, Bacillus, S. aureus, and Klebsiella pneumoniae. Conclusion: These characteristics imply that AgNP{\textquoteright}s-based bio-nano composite films find use in the food industry as an active packaging material.

}, keywords = {Antimicrobial properties, Biodegradable polymers, Carboxy methyl cellulose, Nanocomposites, Silver nanoparticles.}, doi = {10.5530/pres.16.2.29}, author = {Sougandhi PR and Gangadhara R and Shobha Rani T and Venkata Reddy G and Rajeswara Reddy S} }