@article {1396, title = {Green Synthesis of Silver Nanoparticles from Secamone emetica: Characterization and Assessment of Antioxidant, Anti-Diabetic and Anti-Cancer Activities against MCF-7 Breast Cancer Cells}, journal = {Pharmacognosy Research}, volume = {17}, year = {2025}, month = {April 2025}, pages = {597-607}, type = {Original Article}, chapter = {597}, abstract = {

Background: Green-synthesized nanoparticles offer eco-friendly advantages over physical and chemical methods, utilizing plant extracts as natural capping, reducing and stabilizing agents. While Secamone emetica is renowned for its traditional medicinal applications, its potential in green nanoparticle synthesis remains unexplored, offering a promising avenue for research. Objectives: This study aimed to synthesize silver Nanoparticles (AgNPs) using aqueous leaf and stem extracts of Secamone emetica and evaluate their antioxidant, anti-diabetic and anti-cancer properties. Materials and Methods: The aqueous extracts of S. emetica Leaf (SL) and Stem (SS) were used for the green synthesis of AgNPs. The bio-reduction of silver ions by these extracts was validated through UV-visible spectroscopy, X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and Fourier-Transform Infrared Spectroscopy (FTIR). Antioxidant activities were evaluated using DPPH+ and ABTS˙+ radical scavenging assays. The anti-diabetic potential was evaluated through α-amylase and α-glucosidase inhibition assays. Cytotoxic effects on MCF-7 breast cancer cell lines were assessed at 100 μg/mL concentration. Results: SL-AgNPs exhibited higher antioxidant activity compared to SS-AgNPs in both DPPH+ and ABTS˙+ assays. In anti-diabetic assays, SL-AgNPs demonstrated 70.1\% α-amylase inhibition and 68.4\% α-glucosidase inhibition, outperforming SS-AgNPs, which showed 59.3\% and 57.6\% inhibition, respectively. In the anti-cancer assay, SL-AgNPs exhibited a cytotoxicity of 62.5\% against MCF-7 cells, whereas SS-AgNPs showed 50.8\% inhibition. Conclusion: These findings highlight the potential of green-synthesized SL-AgNPs and SS-AgNPs as effective antioxidant, anti-diabetic and anti-cancer agents.

}, keywords = {Anti-cancer, Anti-diabetic, Antioxidant activity, cytotoxicity, Secamone emetica, Silver nanoparticles}, doi = {10.5530/pres.20252064}, author = {S. Shalini and N. Sudeepthi and DH. Geetha and R. Jayashre} } @article {1183, title = {Phyto-mediated Synthesis of Silver Nanoparticles with Afrohybanthus travancoricus Leaf Aqueous Extract and Screening of their in vitro Antioxidant, Anti-Inflammatory, and Anti-diabetic Activities}, journal = {Pharmacognosy Research}, volume = {15}, year = {2023}, month = {October 2023}, pages = {751-760}, type = {Original Article}, chapter = {751}, abstract = {

Aim: There are many uses for silver nanoparticles in the field of biomedicine due to their exceptional properties. A major application of silver nanoparticles is the increase of antibiotics that are clinically helpful against microbes and drug-resistant bacteria. However, environmentally friendly methods for their synthesis must be developed. Objectives: Current study, the major objective of this research is concentrated on to suggest an easy and well-organized biosynthesis of silver nanoparticles by confirmed antioxidant, anti-inflammatory and anti-diabetic activities. The ATSNPs (Afrohybanthus travancoricus silver nanoparticles) was biosynthesized with A. travancoricus plant like capping and reducing agent. Materials and Methods: The ATSNPs aqueous extract were mixed by water extract of 1mM AgNO3 solution led to appearance of greenish brown to dark brown colour indicates the synthesis of SNPs. The silver nanoparticles were characterized by UV-visible spectroscopy, FT-IR, SEM, XRD, and EDX analysis. Antioxidant assay was tested through DPPH and ABTS+ assays, anti-inflammatory assay through albumin denaturation and antidiabetic assay by α-amylase and α-glucosidase activities. Results: A colour change of solution from dark brown to light brown, absorption peak of ATSNPs as 290 to 300 nm in UV-vis spectroscopy. ATSNPs showed 6 intense peaks in FTIR analysis and functional groups like phenols, alcohols, 1{\textdegree} amines, alkynes, aliphatic amines, aromatics, and alkyl halides were identified. In XRD analysis showed 5 intense peaks at 20.8{\textdegree}, 30.3{\textdegree}, 40.1{\textdegree}, 40.9{\textdegree}, 60{\textdegree}. The EDX analysis the presence of Ag at 3 kev and SEM analysis showed the size of ATSNPs ranges between 88 μm {\textendash} 242 μm. Antioxidant activity was observed the dose dependent manner in both assays. Anti-inflammatory activity of ATSNPs proved maximum inhibition through egg albumin denaturation. Antidiabetic activity exhibits maximum inhibition percentage of α-amylase and α- glucosidase at 10 μg/mL. The lowest IC50 value was noted in α amylase (170 μg/mL) and α glucosidase (134 μg/mL). Conclusion: The obtained results recommended that using ATSNPs, it is likely to represented silver nanoparticles with controlled characteristics and important pharmacological activities.

}, keywords = {Afrohybanthus travancoricus, Anti-diabetic activity, Anti-inflammatory, Antioxidant, Green synthesis, Silver nanoparticles}, doi = {10.5530/pres.15.4.079}, author = {Balrajmani Davidson Raja and Devaraj Sathiya Sheela and Elumalai Shanthi Priya and Ammasaikutty Vanitha and Kandasamy Kalimuthu and Periannan Viswanathan} } @article {1083, title = {Biosynthesis of Silver Nanoparticles from Polyphenolic Extract of Baliospermun solanifolium using Central Composite Design}, journal = {Pharmacognosy Research}, volume = {14}, year = {2022}, month = {October 2022}, pages = {405-411}, type = {Original Article}, chapter = {405}, abstract = {

Background: Plant extracts contain a considerable amount of polyphenols. These polyphenols act as reducing, capping, and stabilizing agents in the formation of silver nanoparticles. Objectives: The objective of the current study is biosynthesis, optimization, and evaluation of silver nanoparticles from the polyphenolic extract of Baliospermum solanifolium. Materials and Methods: Central composite design (CCD) was used to synthesize silver nanoparticles (AgNPs) from the polyphenolic extract of Baliospermum. Preliminary screening was done to find out the upper and lower limits for the optimization study. Four independent variables like Silver nitrate concentrations (mM), Baliospermum extract (\%), stirring time (min), and stirring rate (RPM) were employed. As per the design expert, 30 experiments were performed and their effects on dependent variables were listed. Analysis of synthesized AgNPs was done by visual observation, UV-vis Spectroscopy, Zeta potential, X-ray Diffraction (XRD), FTIR, FESEM, etc. Results: The development of Baliospermum silver nanoparticles was confirmed by a color change from pale yellow to dark brown. Characteristic peak of silver nanoparticles observed at 432 nm. -15 mV Zeta potentials confirmed the stability of silver nanoparticles. The sizes of the produced nanoparticles were measured using a FESEM and ranged from 70 to 140 nm. The crystalline nature of nanoparticles was confirmed with the help of X-ray crystallography. FTIR data strongly revealed the presence of phenolic compounds in the reduction, stabilization, and biosynthesis of AgNPs. Conclusion: Major Optimized factors offered by the Central composite design were 10mM AgNO3, 10 \% Baliospermum extract, 150 min, and 700 rpm. As per the data collected from FTIR and HPLC, silver nanoparticles could be capped with major phenolic groups like ellagic acid, catechins, and quercetin.

}, keywords = {Baliospermum, Central composite design, Design expert, Green synthesis, Silver nanoparticles}, doi = {10.5530/pres.14.4.59}, author = {Sarika Ankushrao Nikam and Shilpa Pravin Chaudhari} } @article {87, title = {Green Synthesis and Characterization of Silver Nanoparticles from Stem Bark Extract of Cordia dichotoma G. Forst and Evaluation of their Antioxidant and Antibacterial activities}, journal = {Pharmacognosy Research}, volume = {13}, year = {2021}, month = {June 2021}, pages = {158-164}, type = {Original Article}, chapter = {158}, abstract = {

Background: There is a lack of scientific evidence for the fabrication of silver nanoparticles (AgNPs) using stem bark extract of medicinal plant Cordia dichotoma and its potential therapeutic applications. Objectives: In our present study we contemplated using Cordia dichotoma extract for fabricating AgNPs and to analyze their potential applications as antioxidant and biocidal agents. Materials and Methods: AgNPs were fabricated by bio reduction of silver nitrate solution with bark extract of Cordia dichotoma. The fabricated AgNPs were characterized using U.V visible, FT-IR, XRD, SEM, EDAX, particle size analyzer, and zeta potential. Further, evaluated for their potential antioxidant activity and compared with the crude extract of Cordia dichotoma and with standard ascorbic acid. The antibacterial activity was performed against both Gram-positive and Gram-negative bacteria. Results: The AgNPs were synthesized and UV spectra showed maximum absorbance at 430nm, which is the characteristic feature of AgNPs. The XRD peaks at (111), (220), and (311) indicate the existence of silver with a crystalline structure. The FT-IR spectra in the range of 1516 to 1634 cm-1 reflected the presence of phenol groups which acted as the capping agents for synthesized AgNPs. The SEM images confirmed the spherical structure of AgNPs that formed aggregates with phytochemicals and appeared as composites. The average size of AgNPs is 39.8nm and exhibited good stability as evident from the zeta potential value of -33. Conclusion: Phytomediated eco-friendly synthesized and structurally characterized AgNPs can act as antioxidants and exhibited antibacterial activity against Gram-positive (Staphylococcus aureus) and Gram-negative (Escherichia coli) pathogenic bacteria.

}, keywords = {Antibacterials, Antioxidants, Cordia dichotoma, Silver nanoparticles}, doi = {10.5530/pres.13.3.8}, author = {Gone Swapna and Bhattiprolu Kesava Rao} }