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Oil palm empty fruit bunches (EFBs) are an attractive lignocellulosic material that can be used as a cheap renewable feedstock to produce organic acids and many other value-added products. This research is aimed at investigating the potential of steam-exploded oil palm EFBs for the production of fumaric acid, a food additive widely used for flavor and preservation, through a separate hydrolysis and fermentation process using the selected fungal isolate Rhizopus oryzae K20. To develop an efficient method for the recovery and purification of fumaric acid from fermented oil palm EFBs, a two-stage precipitation protocol was employed, followed by an activated carbon-mediated polishing step to remove contaminants. After these two processes were accomplished, a recovery yield of 81.2% and a purity of 83.5% were achieved.

Recovery and Purification of Fumaric Acid from Fermented Oil Palm Empty Fruit Bunches Using a Simple Two-Stage Precipitation Procedure