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The present study introduces a minimalistic and cost-effective approach to synthesising Gold nanoparticles (AuNPs) using aqueous leaf extracts of Andrographis paniculata. In this synthesis, bioactive metabolites in the leaf extract act as reducing agents, converting Au³⁺ ions to metallic Au⁰, while proteins in the extract form a stabilising layer around the nanoparticles to prevent agglomeration and maintain particle size stability. The synthesised AuNPs were systematically characterised using a range of analytical techniques. UV-visible spectroscopy verified the presence of surface plasmon resonance, Fourier-transform infrared (FTIR) spectroscopy identified key functional groups, X-ray diffraction (XRD) revealed high crystallinity, and Transmission Electron Microscopy (TEM) indicated particle sizes ranging from approximately 4-15 nm. Additionally, Energy Dispersive X-ray (EDX) analysis confirmed the elemental composition of the nanoparticles. The biological efficacy of the synthesised AuNPs was rigorously evaluated. Antioxidant activity, assessed via DPPH and ABTS assays, showed notable results, with inhibition rates of 87.35% and 75% at a sample concentration of 100 µg/mL, respectively. In vitro cytotoxicity studies on Vero cells demonstrated a significant reduction in cell viability, reaching a minimum of 18.22% at the highest tested concentration of 100 µg/mL. Antimicrobial assays indicated strong activity against Salmonella typhii and Escherichia coli, with comparatively lower efficacy against Pseudomonas aeruginosa and Bacillus cereus. Furthermore, adsorption studies showed the AuNPs' high efficiency in removing 99% of crystal violet dye (500 mg/L) within 30 min under optimised conditions (pH 4.5, temperature 33 °C, and an AuNP dosage of 200 mg/L). This comprehensive analysis indicates that the synthesised AuNPs from A. paniculata exhibit promising properties for applications in biomedicine and wastewater treatment.
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http://dx.doi.org/10.1007/s12013-024-01627-9 | DOI Listing |
Cell Biochem Biophys
December 2024
Department of Biotechnology, Prathyusha Engineering College, Tiruvallur, Chennai, 602025, Tamilnadu, India.
The present study introduces a minimalistic and cost-effective approach to synthesising Gold nanoparticles (AuNPs) using aqueous leaf extracts of Andrographis paniculata. In this synthesis, bioactive metabolites in the leaf extract act as reducing agents, converting Au³⁺ ions to metallic Au⁰, while proteins in the extract form a stabilising layer around the nanoparticles to prevent agglomeration and maintain particle size stability. The synthesised AuNPs were systematically characterised using a range of analytical techniques.
View Article and Find Full Text PDFNaunyn Schmiedebergs Arch Pharmacol
December 2024
Key Laboratory of Epigenetics and Oncology, The Research Center for Preclinical Medicine, Southwest Medical University, Luzhou, 646000, China.
Gold nanoparticles (AuNPs) have emerged as promising candidates for cancer therapy due to their unique physicochemical properties and biocompatibility. In this study, we investigate the synthesis, characterization, and therapeutic potential of AuNPs in breast cancer treatment. Further, it establishes a comprehensive understanding of the mechanisms by which AuNPs suppress angiogenesis and breast cancer growth, identifying novel targets and signaling nodes contributing to the anti-tumor effects of AuNPs.
View Article and Find Full Text PDFAnal Chem
December 2024
College of Food Science and Engineering, Northwest A&F University, Yangling, Shaanxi 712100, China.
According to the fluorescence internal filtering effect (IFE), the more the absorption spectrum of the quencher overlaps with the excitation and emission spectra of the fluorescent substance, the better the quenching effect and, correspondingly, the more significant and sensitive the contrast becomes when the fluorescence is turned on. Thus, in the competitive fluorescence-quenching lateral flow immunoassays (FQ-LFIAs), the fluorescence quencher with an outstanding optical property is of great importance. Herein, gold nanoparticles (AuNPs) and polydopamine (PDA) coengineered covalent organic frameworks (COF/Au@PDA) were synthesized as a fluorescence quencher to increase spectral overlap.
View Article and Find Full Text PDFPharm Nanotechnol
December 2024
Central Department of Chemistry, Tribhuvan University, Kirtipur, Kathmandu 44618, Nepal.
Introduction: Metal nanoparticles have received much attention due to their unique physical dynamics, chemical reactivity, and promising biological applications. Green synthesis using natural compounds is an alternative to traditional chemical methods for the synthesis of nanoparticles.
Materials And Methods: Herein, two secondary metabolites were isolated from different fractions of methanolic extract of Citrullus colocynthis (bitter apple) Schard.
Biosens Bioelectron
December 2024
School of Science and Engineering, Shenzhen Institute of Aggregate Science and Technology, The Chinese University of Hong Kong, Shenzhen, (CUHK-Shenzhen), Guangdong, 518172, China.
Krebs von den Lungen-6 (KL-6) has been recognized as an effective serum biomarker for interstitial lung disease (ILD). The KL-6 accurate detection is of great significance for evaluating the severity of ILD and the prognosis of patients. In this study, a bright aggregation-induced emission luminogen (AIEgen) N, N'-((1,2-diphenylethene-1,2-diyl)bis(4,1-phenylene))bis(N-phenylnaphthalen-1-amine) (TPETN) with a high quantum yield of 87.
View Article and Find Full Text PDFEnter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!