Abstract
The phytochemical investigation of Arum palaestinum resulted in the isolation of two flavone C-glucosides, namely isoorientin (luteolin 6-C-glucoside) and vitexin (apigenin 8-C glucoside). The effects of isoorientin on rat isolated aorta, ileum, trachea and uterus and on guinea-pig uterus were studied. Isoorientin (10 −7M–6×10 −4M) caused concentration-dependent inhibition of the amplitude and the frequency of the phasic contractions of the rat and guinea-pig uterus but did not affect the isolated aorta, ileum or trachea. The results were discussed in relation to the effects of its aglycone luteolin reported in the literature.
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