the present invention relates to an obtainment process of biodegradable polymers from a citric residue resulting from the processing of orange juice . the polymers obtained are polyesters classified as polyhydroxyalkanoates including , among them the poly and poly . the biodegradable polymer is obtained from the batch culture process or fed batch culture process with or without recirculation of the cells , using as a carbon source the pre - treated pressing liquor and / or the citric molasses . the polyhydroxyalkanoates , herein described , can be used as substitutes of the synthetic polyesters in different areas , including the food , pharmaceutical , medical , agricultural and other areas .