Related Experiment Video
Updated: Feb 10, 2026

VirWaTest, A Point-of-Use Method for the Detection of Viruses in Water Samples
Published on: May 11, 2019
A novel reaction-based fluorescent probe for the detection of cysteine in milk and water samples
Jialin Wang1, Hao Wang1, Yanfeng Hao1
1Beijing Advanced Innovation Center for Food Nutrition and Human Health, Beijing Key Laboratory of Flavor Chemistry, Beijing Technology and Business University, No. 11 Fucheng Road, Haidian District, Beijing 100048, PR China.
Abstract:
A novel fluorescent probe 3'-hydroxy-3-oxo-3H-spiro [isobenzofuran-1,9'-xanthene]-6'-yl-2,4-dinitrobenzenesulfonate (probe 1) was designed and synthesized as a visual sensor for the detection of cysteine levels in milk and water samples. The addition of cysteine to the solution of probe 1 resulted in an increase in fluorescence intensity and color change, from light yellow to yellow-green. The distinct color response indicated that probe 1 could be used as a visual sensor for cysteine. Cysteine can be detected quantitatively at concentrations between 0 and 400 μM and the detection limit of the fluorescence response to the probe was 6.5 μM. This suggests that probe 1 could be used as a signaling tool to determine the cysteine levels in samples, such as milk and water.
More Related Videos
06:05Author Spotlight: Leptospira DNA Detection in Water for Environmental Analysis and Disease Surveillance
Published on: June 14, 2024
10:53Concentration of Virus Particles from Environmental Water and Wastewater Samples Using Skimmed Milk Flocculation and Ultrafiltration
Published on: March 17, 2023
Related Concept Videos
Acids, Bases and Neutralization Reactions
Acids, Bases and Neutralization Reactions
Water: A Bronsted-Lowry Acid and Base
Crossed Aldol Reaction Using Strong Bases: Directed Aldol Reaction
Base-Catalyzed Aldol Addition Reaction
Crossed Aldol Reaction Using Weak Bases