A study of the flavonoid composition of Hyssopus officinalis L. (Lamiaceae) plants using high-performance liquid chromatography and NMR spectroscopy revealed the presence of diosmin as the major flavone. The maximum levels of this secondary compound are located in sepals and leaves, which represent 51 and 40.5%, respectively, of the total content of diosmin in whole plant. The presence of isoferulyl D-glucose ester in this plant material was also revealed.
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Marín et al. (1998) studied this question.