Polyhydroxyalkanoates (PHAs) are natural, biodegradable, renewable and biocompatible biopolymers, accumulated intra-cellularly in bacteria as a carbon and/or energy storage material under the conditions of nutrient stress such as nitrogen, phosphate, or oxygen limitation, or in non-optimum pH culture medium and in an excess of carbon sources (Hazer and Steinbuchel 2007). The composition of PHAs depends on the microorganism and nature of the carbon sources allowing the formulation of new polymers with different physicochemical properties such as short or mid-chain and long-chain fatty acids. However, the most common forms found in microbial cells are polyhydroxybutyrate (PHB) and polyhydroxyvalerate (PHV). They can be made into plastic materials with properties that are similar to petrochemical plastics and can replace these materials in many applications (Chen 2009).