Flavonoids and Antioxidant Activities of Silver Nanoparticles of Extract Galaxaura rugosa

Savitri, Evika Sandi, Minarno, Eko Budi ORCID: https://orcid.org/0000-0003-0793-4802, Shinta, Shinta and Bahari, Mohamad Fajar (2025) Flavonoids and Antioxidant Activities of Silver Nanoparticles of Extract Galaxaura rugosa. Biota, 11 (1). pp. 1-13. ISSN 2528-262X

Text Flavonoids_and_Antioxidant_Activities_of_Silver_Na (1).pdf Download (1MB)

Abstract

The algae Galaxaura rugosa contains phenolic compounds, flavonoids, β-carotene, and galactane sulfate, which are natural antioxidants. The development of antioxidants derived
from red algae into silver nanoparticles (AgNPs) can improve their effectiveness in preventing reactive oxygen species (ROS). The study aims to synthesize silver nanoparticles using G. rugosa algae and to evaluate the total flavonoid content and antioxidant activity of
the resulting silver nanoparticles. The synthesis of silver nanoparticles utilized G. rugosa extract as a bioreductor. Characterization of the silver nanoparticle was conducted using Particle Size Analysis (PSA) and UV-Vis Spectrophotometer. The total flavonoid and antioxidant activities of silver nanoparticles using UV- VIS spectrophotometry. The total flavonoid content and antioxidant activity of the silver nanoparticles were also analyzed using a UV-Vis spectrophotometer. Antioxidant activity was tested using the DPPH method.
The results showed that the synthesis of silver nanoparticles using G. rugosa extract resulted in a color change of the solution from green to yellow. UV- VIS spectrophotometry measurements revealed absorption within the 570-580 nm wave range, with a maximum peak
at 406 nm. The size distribution of the synthesized nanoparticles, as measured by PSA, averaged 11 nm. The total flavonoid content of G. rugosa silver nanoparticles was 36.21±0.65 mgQE/g, higher than that of the extract alone (32,12±0,79 mgQE/g). The antioxidant activity (IC50) of the G. rugosa silver nanoparticles was 26.658 ±1.44 ppm,
classified as very strong, compared to the extract alone, which had an IC50 value of 46,128 ± 1.6, categorized as strong.

Item Type:	Journal Article
Keywords:	Antioxidant; Flavonoid; Galaxaura rugose; Silver nanoparticle.
Subjects:	03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030501 Free Radical Chemistry 03 CHEMICAL SCIENCES > 0305 Organic Chemistry > 030504 Organic Green Chemistry 06 BIOLOGICAL SCIENCES > 0607 Plant Biology
Divisions:	Faculty of Mathematics and Sciences > Department of Biology
Depositing User:	Shinta Shinta
Date Deposited:	11 Feb 2026 09:20

Downloads

Origin of downloads

Actions (login required)

View Item