Production of humic acids by solid-state fermentation of in raw oil palm empty fruit bunch fibers.

Humic acids (HA) are organic macromolecules of high structural complexity and are primarily obtained from non-renewable carbon sources such as peat and coal. HA is widely used in agriculture but is known to have therapeutic properties, which are still poorly explored. Previous studies have shown the potential of biotechnological processes in the production of HA in submerged fermentation (SF) and solid-state fermentation (SSF) using pre-treated fibers of oil palm of empty fruit bunch (EFB) for the cultivation of strains.