Production of verbascoside in callus tissue of Eremophila spp

Callus tissue cultures of Eremophila denticulata and E. decipiens accumulate up to 20% of their dry weight as a mixture of hydroxyphenylethanol glycosides of which the major component is the caffeoyl ester, verbascoside (acteoside). The production of this compound under a variety of growth conditions has been studied. Verbascoside has also been isolated from callus tissue of E. clarkei, E. drummondii, E. glabra and E. viscida.