In order to promote congolese plants with antihypertensive properties, two hypotensive (antihypertensive) extracts of Trema orientalis B. leaves were selected in order to know their flavonoid profiles. Therefore, these extracts were prepared and underwent bioguided fractionations until the isolation of the compounds on silica gel. These ethanolic and aqueous extracts presented similar characteristics (appearance, solubility in polar solvents, color of spots at UV 365 nm, frontal ratio). Five compounds were isolated from these extracts of Trema orientalis leaves. The analytical data of these compounds show a similarity of physical and chemical characteristics. These compounds presented in NMR1H the same basic structure of the flavonoid type, 5,7,4’-trihydroxyl-2,3-dihydroflavonol (Kaempferol) or 5,7,4’-trihydroxyl-2,3-dihydroisoflavonol of gross formula C15H12O6 and differ on their osidic part. Therefore, the definitive structural determination of these compounds must be confirmed by other more in-depth analyses. They will allow to valorize this plant by the production of phytoproducts rich in flavonoids antihypertensive and with oxidizing power.

The essential oil of Mondia whiteï dry roots (Hook, f.) Skeels, harvested at Kindamba, in the Pool Department, south of Congo Brazzaville was extracted by hydrodistillation with a yield of 0.50%. Gas chromatography (GC) and gas chromatography-mass spectrometry (GC / MS) were used to characterize the chemical profile of the gas chromatography, then it was subjected to physicochemical analyzes. The physical and chemical properties evaluated were the refractive index and the acid number. The values of the refractive index in ether and in acetone are respectively 1.3703 and 1.3713 that of the determined acid number is zero. Taking into account the high proportion of 2-hydroxy-4-methoxy-benzaldehyde (99.85%), this oil could be a source of production of 2-hydroxy-4-methoxy-benzaldehyde useful for agri-food needs and a formulation necessary for Pharmaceutical industry.