Used primarily in analytical chemistry to detect and quantify reducing sugars in solution. It reacts with the aldehyde group of reducing sugars under heat to form a red-brown complex, which can be measured spectrophotometrically at around 540 nm. This reaction is the basis of the DNS assay, a common method in biochemistry and industrial labs for measuring sugar content in samples such as plant extracts, fermentation broths, and food products. Also applied in enzyme activity studies, particularly to determine the activity of carbohydrase enzymes like amylase and cellulase by measuring the amount of sugar released during substrate breakdown. The method is valued for its simplicity, cost-effectiveness, and reliability in high-throughput screening.