In this paper, the synthesis of nanosized powders β -Tricalcium phosphate β -Ca3(PO4)2 was studied by the wet chemical method at different values of reaction temperature, initial concentration of diammonium hydrogen phosphate (NH4)2HPO4, calcium nitrate tetrahydrate Ca(NO3)2·4H2O addition rate, pH of reaction and aging time. All these parameters have a great impact on the properties of the resulting β-TCP nano powders. Analysis results of morphology, structure of TCP powder from infrared (IR) spectra, X-ray diffraction (XRD) and transmission electron microscopy (TEM) indicated that the synthesized TCP powder had spherical crystal shape with crystallite size, calculated by XRD method, less than 60 nm, mono and biphasic structure composed of βTCP with pyrophosphate calcium or hydroxyapatite. The variation of the synthesis conditions did not affect the morphology, but it affect the size of crystallites and particles.
In infectiology, some essential oils (EOs) are able to competewith antibiotic therapy and even surpass it; it is in this context that a study of the chemical composition and the antibacterial power of the EOs of three aromatic and widely used medicinal plants in traditional medicine was conducted which are Satureja calamintha subsp. nepeta (L.) Briq, Lavandula multifida L., and Mentha pulegium L. The extracted EO yields were of the order of 2.6%, 0.12%, and 5.29% for Satureja calamintha, Lavandula multifida, and Mentha pulegium, respectively. The obtained EOs were analyzed by gas chromatography coupled with mass spectrometry (GC/MS). The results of these analyses showed that Lavandula multifida contains carvacrol as a majority compound (70.65%); by contrast, the pulegone is the majority compound of Satureja calamintha and Mentha pulegium that contain about 87.04% and 71.97%, respectively. The EOs with the pulegone as predominant compound (Mentha pulegium and Satureja calamintha) showed higher antibacterial activity when tested against some multiresistant strains, compared to those with the carvacrol as major compound. In conclusion, this study may open up prospects for the formulation of phytomedicines against resistant and nonresistant bacteria incriminated in nosocomial infections.
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