An HPLC method can be used to generate a chemical fingerprint useful in the
accurate authentication and identification of herbal medicines, in the comparison of
plant materials grown in different regions, and the determination of amount of the
chemically characteristic or pharmacologically active components. In this study,
HPLC was used in the determination of quercetin (Figure 1) in the extracts of
sambong leaves collected from Leyte, Cotabato, and Nueva Ecija. At the time of the
writing of this manuscript, these are the first reported values of quercetin in
sambong samples cultivated in the Philippines