Three new isoflavone glycosides have been characterized from the leave of Juniperus macropoda: 5,7-dihydroxy-6,3′,4′-trimethoxyisoflavone 7-glucoside; 5,7,4′-trihydroxy-6,3′,5′-trimethoxyisoflavone 7-glucoside and 5,7,3′-trihydroxy-6,4′-dimethoxyisoflavone 7-diglucoside.
Two new isoflavones, junipegenin-B and -C, have been isolated from ethanolic extracts of Juniperus macropoda and their structures assigned. One of them, junipegenin-C, has been synthesized from iridin.
An ethanolic extract of Juniperus macropoda , after chromatography, yielded three isoflavones, viz.irigenin, iridin and a new compound. In addition two stilbenes, resveratrol and piceid (resveratrol-3- O -β- D -glucoside), were isolated and characterized.
Abstract By chromatography of an unsaponifiable fraction of a petroleum extract, a saturated hydrocarbon triacontane, 22,23-dihydrostigmasterol and α-carotene were isolated. The identity of triacontane was confirmed by its melting point and elemental analysis. 22,23-Dihydrostigmasterol was identified by its melting point, mixed melting point, melting points of its acetate and benzoate and by its specific rotation in chloroform. α-Carotene was identified by its absorption maxima at 460 and 480 mμ. From the ethanolic extracts a mixture of alkaloids was separated which on chromatography over alumina gave a crystalline alkaloid, monocrotaline, C16H23NO6, m.p. 196–197° and a new crystalline base m.p. 180–181°, named sericine which has not been completely identified. It has the tentative empiric formula C17H24NO7 and may be a new alkaloid. Presence of two more alkaloids was shown by paper chromatography
The rhizomes and roots of Jurinea macrocephala Benth., on extraction with organic solvent, yield a caoutchouc like material. It was found that chloroform extract gives the highest percentage of crude caoutchouc which is sticky and resilient in nature. Thus determination of chloroform extractive offers a convenient method for evaluation of dhoop samples. In the present study dhoop samples from iS different geographical area., covering the whole commercial dhoop producing zone, were found to vary in their caoutchouc , contents. The samples of dhoop collected from Tundah, Bagh and Belaj dhars of Chamba valley and Baramulla range of Kashmir valley give the highest caoutchouc content. The assay value obtained by this method have been found to be in close agreement with the commercial grades of dhoop , that is, superior grades give higher caoutchouc content and inferior grades give a low content. Microchemical and chemical evidence is a1so presented for the presence of caoutchouc in the rhizomes.