Modification of nanostarch by citric acid

Abstract

The negative impact of waste on the environment is growing with the declining oil reserves. Therefore, the attention to usage of green products and the green economy has grown worldwide. One manifestation of this is the growing demand for biomaterials. Starch is a biopolymer with large reserves of raw materials and chemical modification of its structure allows to obtain new materials. In this paper, we present the results of the experimental investigations on modifying of nanostarch with citric acid. Alcohol precipitation method was used for synthesis of nanostarch. The dispersion of the obtained nanostarch was studied by UV spectroscopy. The chemical structure of the modified nanostarch film was studied by FTIR spectroscopy. According to the results of FTIR, it was found that a new ester bonds are formed. Surface morphology was studied by scanning electron microscope and it was found that 0.1 g of film is completely soluble in water in 360 seconds according to the kinetics of water solubility. Key words: nanostarch film, citric acid, FTIR, natural polymer.