Page 15 - tech fest 2025 ב״ש חוברת תקצירים

Development of an Electrochemical Sensor Based on the 1,8-DAN Ligand Using the DPN Method for Copper Detection
ChE-B-05
Shahar Avni; shaharavni57@gmail.com
Advisors: Prof. Ariela Burg1, Ms. Ron Peretz1 1SCE - Shamoon College of Engineering, Be’er-Sheva
Water contamination with heavy metals is a growing concern due to industrialization and environmental degradation. Copper is an essential element but can be harmful at elevated concentrations. The goal of this project was to develop a sensitive, low-cost electrochemical sensor for Cu(II) detection using the 1,8-DAN ligand. Dip-Pen Nanolithography (DPN) was applied to fabricate nanocluster arrays on the electrode. The sensor was evaluated by three parameters: Cu(II) concentration (0.10–1.0 ppb); pH (3 and 5); and nanocluster spacing (4, 6.6, 10 μm). Square wave voltammetry (SWV) was used for these measurements. The best performance was achieved at pH 5 with a limit of detection (LoD) of 0.2 ppb, demonstrating suitability for environmental water monitoring according to international standards.
Keywords: 1,8-DAN ligand, copper ion sensor, DPN, electrochemical sensing
The Effect of Harvest Time on the Nutritional Quality of Avocados and Their Health- Promoting Phytochemical Profile
ChE-B-06
Gal Tsibutovsky; galos9830@gmail.com
Advisors: Prof. Oshrat Ontman1, Dr. Zipora Tietel2 1SCE - Shamoon College of Engineering, Be’er-Sheva 2Agricultural Research Organization, Volcani Institute
Avocado (Persea americana) is a nutrient-rich fruit containing healthy fats, vitamins and phytochemicals with antioxidant properties. This project examines how harvest time affects the fruit’s nutritional quality and the phytochemical compositions of different avocado varieties. Antioxidant activity, phytochemical levels and fatty acid composition were measured, indicating that the Reed avocado has the highest health benefits, while the Hass variety (the most commercially marketed) provides the least health benefits. Some bioactive compounds fluctuate with ripening, and antioxidant activity declines over time, suggesting that earlier harvests retain higher antioxidant levels. Understanding the optimal harvest time for each variety is crucial for maximizing the intake of health- promoting compounds and preserving the fruit’s nutritional value.
Keywords: avocado, bioactive compounds, harvest time, nutritional quality, ripening
Book of Abstracts | 2025
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