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Rahma Nurdi
Universitas Negeri Padang, Indonesia
Biochemistry, Genetics & Molecular Biology Chemistry Mathematics Physics

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Green Synthesis of Silver Nanoparticles from Morning Glory Leaf Extract (Ipomoea tricolor) and its Antibacterial Activity Against Pathogenic Bacteria Eka Cahya Muliawati; Riri Oktaviani; Rahma Nurdi
Science Journal Get Press Vol 3 No 2 (2026): April, 2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i2.619

Abstract

Silver nanoparticles (AgNPs) have attracted considerable attention due to their exceptional physicochemical properties and broad-spectrum antibacterial activity. This study reports the first application of Ipomoea tricolor (morning glory) leaf extract distinguished by its uniquely high alkaloid (ergine, isoergine) and flavonoid (quercetin, rutin, kaempferol) content as a bifunctional bioreductant and capping agent for eco-friendly AgNP synthesis. Compared to commonly used plant sources, I. tricolor provides a rare combination of electron-rich phytochemicals that yield exceptionally small (18.4 ± 3.2 nm), highly stable (zeta potential: −32.4 mV, PDI: 0.214), and potently antibacterial nanoparticles without requiring additional stabilizers. Comprehensive characterization via UV-Vis (SPR at 425 nm), FTIR, XRD (FCC structure, 16.7 nm crystallite), TEM, and DLS confirmed nanoparticle formation and phytochemical capping. Antibacterial evaluation against Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa, and Streptococcus mutans demonstrated inhibition zones of 9.6–22.3 mm and MIC values of 6.25–25 µg/mL superior to AgNPs from most previously reported plant sources. These results establish I. tricolor-mediated AgNPs as promising sustainable candidates for biomedical applications, particularly in addressing antimicrobial resistance.
Smart Solar-Powered Drainage: An Effective Urban Flood Mitigation Solution Kristanti Oktripani Lubis; Rahma Nurdi
Science Journal Get Press Vol 3 No 3 (2026): July,2026
Publisher : CV. Get Press Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.69855/science.v3i3.845

Abstract

Urban flooding caused by high-intensity rainfall, rapid urbanization, and the limited capacity of conventional gravity-based drainage networks continues to threaten infrastructure, public health, and economic activity in developing cities. This study designs, builds, and field-tests a Smart Solar-Powered Drainage System (SSPDS) that combines a photovoltaic energy subsystem, an ultrasonic water-level sensor, a rainfall sensor, an ESP32-based microcontroller, an automated sluice gate, and a solar-powered drainage pump to provide autonomous, grid-independent flood mitigation for peri-urban drainage channels. The prototype was tested over a 30-day field-monitoring period covering 15 rainfall events of varying intensity in a flood-prone peri-urban catchment. Results show that the SSPDS reduced the mean flood-water recession time from 88.6 minutes (conventional passive drainage) to 38.7 minutes, a 56.4% improvement, and maintained continuous autonomous operation with a mean daily PV energy yield sufficient to keep the battery state of charge above the 30% safety threshold even across two consecutive overcast days. The automatic pump-activation logic, triggered once the water level exceeded an 8 cm threshold, consistently produced a faster recession slope than the passive control channel across all monitored events. These findings indicate that integrating renewable energy with real-time IoT-based sensing and automated actuation offers a scalable, low-carbon, and cost-effective alternative to conventional urban drainage infrastructure, particularly for grid-constrained or disaster-prone urban areas.
Co-Authors Eka Cahya Muliawati Kristanti Oktripani Lubis Riri Oktaviani