Used for the quantitative detection of C4H (cinnamate 4-hydroxylase) enzyme activity in plant samples, this ELISA kit enables researchers to measure metabolic changes related to phenylpropanoid biosynthesis. It is widely applied in plant physiology and biochemistry studies to understand plant defense mechanisms, lignin formation, and responses to environmental stress such as UV exposure or pathogen attack. The kit supports high-throughput analysis in agricultural research and genetic engineering, especially in crops or model plants where modulation of secondary metabolism is investigated. Results help in evaluating gene function in metabolic pathways and optimizing plant breeding strategies.