Green biosynthesis of silver nanoparticles using leaf extract of Ammannia baccifera for evaluating their antioxidant, antibacterial and catalytic potentials

• Published in: Journal of molecular structure 2025-02, Vol.1321, p.140264, Article 140264
• Main Authors: Alam, Shahin, Aziz, Md. Abdul, Karim, Md. Rezaul, Rahman, Md. Habibur, Khatun, Marina, Rabbi, M. Ahasanur, Habib, Md. Rowshanul
• Format: Article
• Language: English
• Subjects: Ammannia baccifera; Catalytic; Leaves; Silver nanoparticles
• ISSN: 0022-2860
• DOI: 10.1016/j.molstruc.2024.140264

•Green approach was used to synthesize AB-AgNPs using Ammannia baccifera leaves.•Size, shape and nature of AB-AgNPs were analyzed by XRD, DLS, TEM and SEM techniques.•AB-AgNPs displayed remarkable antibacterial and free radical scavenging activities.•AB-AgNPs exhibited promising catalytic activity in degradation of harmful organic dyes.•AB-AgNPs might be a promising future candidate in medicinal and environmental contexts. The objective of this work is to create an easy, economical, and environmentally sustainable process for making silver nanoparticles (AB-AgNPs) by employing Ammannia baccifera leaf extract as a provider of reducing agents. A surface plasmon resonance (SPR) peak was observed at 413 nm in the UV–Vis absorption spectrum of AB-AgNPs, and it ensured the formation of nanoparticles. The unique bands in FTIR revealed the participation of phytochemicals with effective functional groups in the reduction and stabilization of AB-AgNPs. SEM revealed almost spherical-shaped AB-AgNPs, while EDX confirmed the presence of metallic silver with a strong signal at 3 eV. TEM further verified the formation of spherically-shaped AB-AgNPs, which ranged in size from 13 to 60 nm. The face-centered cubic (FCC) crystal structure of AB-AgNPs was confirmed by an XRD study. TGA, DLS, and Zeta potential studies also assured the stability and particle size distribution of AB-AgNPs. The DPPH and ABTS radicals were used to investigate the antioxidant activity of plant extract and AB-AgNPs, where the best performance of AB-AgNPs was observed in scavenging the ABTS radical with an EC50 value of 27.52 μg/mL. The green-produced AB-AgNPs showed strong catalytic activity for the breakdown of organic dyes (methylene blue, rhodamine B, and para-nitrophenol), and complete dye degradation was attained for each dye within 20 min. AB-AgNPs also showed efficient activity against Escherichia coli in antibacterial tests. These findings suggest that silver nanoparticles (AB-AgNPs) produced from the extract of Ammannia baccifera leaves, may find use in medicinal and environmental contexts. [Display omitted]