Comparative study of the antibacterial action of natural and commercial oils of Rosmarinus officinalis L

Abstract

The article tries to shed light on the antibacterial power of rosemary oils to see if there is a possibility of making drugs but also to compare this power with that existing in commercial oils of rosemary and to check if these formulas really contain oils rosemary. This study consisted of the extraction of the essential oil from the studied plant followed by preliminary phytochemical tests and then by TLC analyzes to determine exactly the different compounds that characterize the species and then by the antibacterial study on the plants diluted essential oils (synthesized and commercial). Phytochemical tests have shown that essential oils contain many chemicals and active ingredients that give rosemary a wide range of indications : The TLC of the raw extract shows stains, indicating the presence of flavone, hydroxyflavone, Dihydroxyflavone, flavanones, methoxyflavones and flavonols ; they are compounds of paramount importance in the therapeutic effects enjoyed by rosemary. The bacteriological study on essential oils (extract and commercial) by the process represented on the concentrated disk of essential oils shows good antibacterial activity on the fixed stem ; the zone of inhibition is of 08 and 06 mm for Escherischia. coli and 10.09 and 08 mm for Staphylococcus aureus and 17, 14, 13.11 mm for Klebsiela sp. Essential oils extracted from rosemary from Algeria will be of some economic interest in the Algerian pharmaceutical industry. The negative test of commercial rosemary essential oil compared to the positive tests of the rosemary extract (just 10 mm diameter at concentration D1 for Klebsiella. sp and zero results at all other concentrations with the other strains including those that reacted to the rosemary extract tested ) provides information on the counterfeiting that characterises this field.. The study confirms the interest we must bring to this plant, not only for its characteristics in the perfume industry, but especially for its undisputed medical virtues.