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Exploitation of spoilage dates as biomass for the production of bioethanol and polyhydroxyalkanoates

2023; Elsevier BV; Volume: 220; Linguagem: Inglês

10.1016/j.renene.2023.119655

1879-0682

Fathia Madi, Ridha Hachicha, Jesus Enrique Rodriguez Gamero, Ameya Pankaj Gupte, Nicoletta Gronchi, Mansour Haddad, Lorenzo Favaro, Sergio Casella, Marina Basaglia,

Polyamine Metabolism and Applications

The exploitation of agri-food wastes is of great importance for environmental and economic reasons. Date wastes are attractive biomasses that could be used as a carbon source for the growth of microorganisms to obtain added-value products. In this work, spoilage date syrup, containing 102.01 and 101.00 g/L of glucose and fructose, respectively, was assessed as a feedstock for the production of bioethanol and polyhydroxyalkanoates (PHAs) by Saccharomyces cerevisiae MEL2 and Cupriavidus necator DSM 545, respectively. The waste date syrup was first evaluated as a carbon source for microbial growth and resulted to sustain the growth of both strains. 47.95 g/l of ethanol, corresponding to the 93.52% of the theoretical yield, were obtained from the fermentation of date syrup by S. cerevisiae MEL2, here adopted as a proficient bioethanol yeast strain. Furthermore, C. necator DSM 545, a well-known PHAs-producer, was able to accumulate up to 79.20 % (w/w on dry mass) of PHAs. This study demonstrates that bioethanol and PHAs can be obtained from date wastes, contributing to developing cost-effective exploitation of these residues with economic and environmental advantages.