Sinapine hydroxide is primarily utilized in the field of biochemistry and plant physiology research. It plays a significant role in studying the metabolic pathways of plants, particularly in understanding the biosynthesis and degradation of phenolic compounds. This chemical is often used as a reference standard in chromatographic analysis to identify and quantify related compounds in plant extracts. Additionally, sinapine hydroxide is investigated for its potential antioxidant properties, which could have applications in developing natural preservatives or health supplements. Its role in seed germination and plant defense mechanisms is also a subject of interest in agricultural research.