Differences in color and flavonoid content within the passion flower plant.

In a recent study, scientists at Nutrilite Division, Amway Corp. (19600 6th St., Lakeview, CA 92567) found differences in the color and content of vitexin, isovitexin, orientin and the total flavonoids found in the leaves and stems of vegetative passion flower plants (Passiflora incarnata L.).

Passion flower grows spontaneously in wide areas of South and Central America and is cultivated for its ornamental and medicinal properties in Europe and the U.S. The sedative and anxiolytic properties of the aerial parts of passion flower are exploited by the health food industry in the production of dietary supplements and teas.

Flavonoids and harman alkaloids have been associated with passion flower's pharmacological activity. In particular, the C-glycosilated flavonoids vitexin, isovitexin, orientin and homorientin have been the subject of much attention. The distribution of these compounds in the plant is an important feature to consider when trying to maximize the efficacy of resulting formulations.

Furthermore, other distinctive sensory features, such as color, can favor the selection of one plant organ over another.

Using high-performance liquid chromatography, the investigators found that the leaves of the plant have significantly higher levels of vitexin, isovitexin and total flavonoids than the stems. No orientin was detected in either leaves or stems.

There was a variation in color between plant organs. Instrumental color evaluation showed that the leaves were greener and darker than the stems. The results of this study emphasize the need to be selective when sourcing these materials.

Further information. Ernesto Brovelli; phone: [phone]; fax: [phone]; email: [e-mail]. Or Jane Supri; phone: [phone]; email: [e-mail].