Aristolocholic acid is primarily used in analytical chemistry as a reference standard for system suitability in high-performance liquid chromatography (HPLC) and other chromatographic techniques. It ensures the proper functioning of the analytical system by verifying parameters such as resolution, retention time, and peak symmetry. This is particularly important in the detection and quantification of aristolochic acids and related compounds in various samples, including herbal medicines and biological matrices. By confirming system performance, it helps maintain accuracy and reliability in analytical results, which is critical for quality control and regulatory compliance in pharmaceuticals and toxicology studies.