Used for the quantitative detection of hydroxycinnamoyl transferase (HQT) enzyme activity in plant samples. This ELISA kit enables researchers to measure HQT levels in leaves, stems, and roots, supporting studies on phenolic compound biosynthesis, particularly chlorogenic acid production. It is widely applied in plant physiology and metabolic research to evaluate how environmental stress, genetic modifications, or growth conditions affect HQT expression and plant defense mechanisms. The assay is suitable for high-throughput analysis in agricultural and biochemical laboratories.