Phytochemical Investigation and Biological Studies on Selected Species.

is the more recent name for the genus , which contains over 250 individual species of flowering plants in the family . Several species are used in folk medicine and have been reported to exhibit various biological activities. Although known to exhibit different terpenoids and flavonoids, the chemistry of the genus is not comprehensively studied due to the structural complexity of the compounds.

Characterization of Four New Compounds from Leaves and Their Tyrosinase Inhibitory Potential.

(king protea) is a flowering plant that belongs to the Proteaceae family. This multi-stemmed shrub is the national flower of South Africa and has important economic and medicinal values. Traditionally, the main therapeutic benefits of this plant species include the treatment of cancer, bladder, and kidney ailments.

Genus and Compound Activities in the Management of Diabetes Mellitus.

The global management of diabetes mellitus (DM) involves the administration of recommended anti-diabetic drugs in addition to a non-sedentary lifestyle upon diagnosis. Despite the success recorded from these synthetic drugs, the traditional method of treatment using medicinal plants is increasingly accepted by the locals due to its low cost and the perceived no side effects. species are used in folk medicine and are documented for the treatment of DM in different regions of the world.

Flavonols and an oxychromonol from Piliostigma reticulatum.

The leaf extract from the plant Piliostigma reticulatum was found to exhibit antimicrobial activity against some bacteria and fungi such as Staphylococcus aureus (NCTC 6571), Escherichia coli (NCTC 10418), Bacillus subtilis (NCTC 8236), Proteus vulgaris (NCTC 4175), Aspergillus niger (ATCC 10578) and Candida albicans (ATCC 10231). Upon investigation of the chemical constituents present in the leaf extract, a total of seven compounds were isolated and their structures were unambiguously established by spectroscopic methods including HR-MS and NMR spectrometry. Four of the isolated compounds were novel, namely 6-C-methyl-2-p-hydroxyphenyloxychromonol (piliostigmol), 1, 6,8-di-C-methylquercetin-3,3',7-trimethyl ether, 2, 6,8-di-C-methylquercetin-3,3'-dimethyl ether, 3 and 3',6,8,-tri-C-methylquercetin-3,7-dimethyl ether, 4.