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A novel growth-based plasmonic sensor for H2O2 determination was developed from dual-shaped silver nanostructures consisting of starch-stabilized yellow silver nanospheres (AgNSs) and citrate-capped red silver nanoprisms (AgNPrs). The unique ability of H2O2 to oxidize silver nanoparticles and reduce silver ion consequently was exploited to produce a highly sensitive and selective sensor (AgNSs/NPrs). AgNPrs were enlarged …

Synergistic Redox of Dual-Shaped Silver Nanostructures for Highly Selective Sensing of Hydrogen Peroxide Read More »

Comprehensive two-dimensional gas chromatography (GC×GC) offers high resolution and enhanced peak capacity separating complex samples, e.g. petrochemicals, essential oils, food or biological. This technique provides enhanced peak capacity and selectivity compared with that obtained from one dimensional GC. In this research, Assist. Prof. Dr. Chadin Kulsing and Dr. Nuttanee Tungkijanansin (Postdoctoral researcher) developed splitter-based non-cryogenic …

Development and Application of Novel Multiloop Splitter-based Non-cryogenic Artificial Trapping (M-SNAT) Modulation System in Comprehensive Two-Dimensional Gas Chromatography Read More »

The generation of oxygen from electrolysis in gel electromembrane extraction (G-EME) causes a negative error when applied to the analysis of easily oxidized species such as nitrite. Nitrite in G-EME is oxidized by oxygen to nitrate, leading to the negative error and the impossibility of simultaneous analysis. In this work, the application of oxygen scavengers …

Application of oxygen scavengers in gel electromembrane extraction: A green methodology for simultaneous determination of nitrate and nitrite in sausage samples Read More »

Hepatitis B infection has caused severe symptoms and fatalities around the world, so a simple and fast point-of-care diagnostics is in need. In this work, the research group of Professor Orawon Chailapakul developed an electrochemical sensor for simultaneous detection of hepatitis B surface antigen (HBsAg) and hepatitis B e antigen (HBeAg), common Hepatitis B biomarkers. …

Dual-label vertical-flow based electrochemical sensor for hepatitis B diagnostics Read More »

Ten undescribed benzophenones, schomburginones A− J, together with 14 known analogs were isolated from the leaves of Garcinia schomburgkiana, an edible plant native to the Indochina region. The structures of the undescribed compounds were elucidated by NMR combined with HRMS spectroscopy, while their absolute configurations were determined using ECD and single-crystal X-ray diffraction analysis. The …

Schomburginones A‒J, geranylated benzophenones from the leaves of Garcinia schomburgkiana and their cytotoxic and anti-inflammatory activities Read More »

Geographical indication, a type of intellectual properties, plays a pivotal role in modern world trades. It is a tool that can very well sustain the value of local products. In a research led by Assoc. Prof. Dr. Thanit Praneenararat, the analysis of chemical constituents in Thai coffees was performed using paper spray mass spectrometry. This …

Paper spray mass spectrometry as an effective tool for differentiating coffees based on their geographical origins Read More »

Prof. Dr. Orawon Chailapakul from the Department of Chemistry, Faculty of Science, Chulalongkorn University and her group earned awards from the 48th International Exhibition of Inventions of Geneva held in Geneva, Switzerland, from April 26-30, 2023. The team received gold medal from “An Innovative Electrochemical Analytical Device with a Smartphone for Heavy Metals Detection” and …

Electrochemical Sensors Earned Medal Awards from the 48th International Exhibition of Inventions GENEVA Read More »