THE EXTRACTION OF BIOPOLIMERS FROM THE ENDOSPERMS OF SOME LEGUMINOSAE PLANTS, IN ORDER TO BE USED AS CORROSION INHIBITORS

The loss from corrosion in the world economy is always a serious issue. Some organic compounds have shown inhibitor properties to protect the metals against the corrosion. It is important to find compound that are not expensive and have no hazardous properties to living creatures and environments. The recent research tried to find naturally organic substances or biodegradable organic materials to be used as inhibitors, which are friendly with the environment. Such compounds are some biopolymers, extracted from leguminosae plants, called galactomannans. Galactomannans are polysaccharides with high molecular wheight, that make up near 50% of weight of extracted polysaccharides. Galactomannans from the endosperms of leguminosae plants were obtained by aqueous extraction in temperature 25oC followed by a precipitation with ethanol (C2H5OH), in ratio extract: ethanol 1:2 (v/v). In order to profit pure galactomannan, without lipids and proteins the endosperms of these plants were treated first, with toluene: ethanol (C6H5CH3:C2H5OH) in ratio 2:1(v/v).The product of extraction was analyzed with infrared (IR) and nuclear magnetic resonance (NMR) spectroscopy, in order to define it’s chemical structure. Also we defined the density, pH and molecular wight of the product. The product of extraction was galactomannan and we propose to use it as corrosion inhibitor.