Expression, purification and application of recombinant Pediocin from Pichia pastoris X33::ped in shrimp preservation trial

Pediocin (Ped) is a 4.6kDa bacteriocin effective against Listeria monocytogenes and several Gram-positive bacteria. To produce purified Ped with high yield and apply it to food preservation, this study expresses and purifies recombinant Ped (rPed) from Pichia pastoris X33::ped, and preliminary applies it in shrimp preservation. The results showed that methanol 1% is optimal for inducing the expression of rPed from P. pastoris X33::ped, achieving 6,400 AU/ml of rPed after 72 hours of yeast culture on a BSM medium. The rPed purification process was successfully established with a sample loading rate of 155.9 cm/h. This process yielded rPed with 91.7% purity and 11.0 mg per liter of culture. This rPed could preserve shrimp at 4°C for 07 days. Therefore, these results demonstrate the potential of producing rPed from Pichia pastoris X33::ped and applying it in food preservation.