Keywords :
Lamiaceae, Gomphostemma, Chelonopsis, Bostrychanthera, Flavonoids, Phenolic acids, Dicaffeoylquinic acid
บทคัดย่อ :
Species in the genera Gomphostemma, Chelonopsis and Bostrychanthera were systematically studied with reference to their flavonoid and phenolic acid compounds in order to investigate whether the profiles of these compounds would support a classification of the genus and related genera based on morphological characters. Thirty-five flavonoid glycosides, eight phenolic acids and derivatives were identified by LC-UV-MS/MS analysis of aqueous 80% MeOH extracts on the basis of their UV and mass spectra, retention times and comparison with in-house library. The occurrence of individual compounds was not
particularly informative in Gomphostemma, although the overall chemical profile supported G. subgen. Pogosiphon and vicenin-2 was a characteristic component of Gomphostemma
leptodon and Gomphostemma curtisii. In contrast, the flavonoids and phenolic acids
of Chelonopsis were informative at infrageneric level. Glycosides of 6 substituted flavones
were well represented in Ch. subgen. Aequidens, including Ch. forrestii, Ch. rosea, Ch.
odontochila, Ch. lichiangensis and C. giraldii. A dicaffeoylquinic acid was produced in Ch.
subgen. Chelonopsis, (for example, in Ch. longipes and Ch. Moschata), but absent from Ch.
subgen. Aequidens. The same dicaffeoylquinic acid was also found in the genus Bostrychanthera
and suggests a close relationship with Ch. subgen. Chelonopsis, in agreement
with a recent DNA based phylogeny. There is correlation between trichome type and
phenolic acid compound distribution in Chelonopsis, but this is not observed in
Gomphostemma.
เอกสารอ้างอิง :
Bongcheewin, B., Grayer, R. J., Porter, E. A., Kite, G. C., Simmonds, M. S., Ingrouille, M. J., & Paton, A. J. (2014). A chemosystematic study of the genus Gomphostemma and related genera (Lamiaceae). Biochemical Systematics and Ecology, 57, 305-316.
