بهينه سازي اسانس گل محمدي (Rosa damascene Mill) با استفاده از گلاب

Quality improving of Rose (Rosa damascene Mill.) oil by using distilled water

Rangelands Rosa damascena Mill, is one of the important rose species for production of aromatic compounds. The oil and distilled water of Rose are used vastly in medicinal, hygienic-cosmetic and food industries. One of the main aromatic compounds of rose is phenyl ethyl alcohol. Because of the high solubility of this compound in water, the most content of it is solved in distilled rose water, so it is not present in rose oil or itʹs percentage is very low. The aim of this study was extraction of the soluble compounds from distilled water by organic solvent and adding them to rose oil for improving it. For this purpose, three Rosa damascena samples were examined. The first oils were obtained by hydro distillation. The aromatic compounds of distilled water extracted by liquid-liquid extraction method with hexane, petroleum ether and dichloromethane. The first oils (main oils obtained by hydrodistillation), the second oils (aromatic compounds extracted by solvent from distilled water) and the mixture of them were analyzed by GC and GC/MS. The results showed the best solvent for extraction of phenyl ethyl alcohol from distilled water was dichloromethane. Adding the second oil extracted with dichloromethane to the first oil, not only increased the percentage of phenyl ethyl alcohol but also increased the relative content of citronellol and geraniol in the mixed oil. Addition of second oil, obtained by petroleum ether to the first oil, increased the percentage of citronellol, while increasing of phenyl ethyl alcohol was not remarkable. The percentage of phenyl ethyl alcohol in the mixed oil (the second oil extracted with dichloromethane + the first oil) was more than 20%.