Production of polyhydroxyalkanoates by Azotobacter chroococcum H23 in wastewater from olive oil mills (alpechin)

We describe the production of large amounts of homo- and copolymers of polyhydroxyalkanoates (PHAs) by Azotobacter chroococcum strain H23 when growing in culture media amended with alpechin. A. chroococcum grown on NH₄⁺-medium supplemented with alpechin formed PHAs up to 50% of the cell dry weight after 24h. The results show that alpechin supports the growth of strain H23 and also that this waste could be utilized as a carbon source. Production of PHAs by using alpechin looks promising, since the use of inexpensive feed-stocks for PHAs is essential if bioplastics are to become competitive products.