Dansylhydrazine is widely used as a fluorescent labeling reagent in biochemical and analytical applications. It is particularly valuable for detecting and quantifying carbonyl compounds, such as aldehydes and ketones, in various samples. The compound reacts with carbonyl groups to form stable hydrazone derivatives, which exhibit strong fluorescence, enabling sensitive detection using fluorescence spectroscopy or HPLC. This makes it a useful tool in the analysis of oxidative stress biomarkers, such as malondialdehyde, in biological systems. Additionally, dansylhydrazine is employed in the study of glycated proteins and advanced glycation end products (AGEs), which are relevant in diabetes research and aging studies. Its high sensitivity and specificity make it a preferred choice for trace analysis in complex matrices like food, environmental samples, and biological fluids.