Effect of various novel pre-treatments on drying and rehydration behaviour of ginger and quality attributes of dried ginger

Abstract The present study focused on the influence of different solution-based osmo-sonic pre-treatments on the drying, rehydration, and quality attributes of ginger cubes. Osmo-sonic pre-treated drying followed the empirical page model, and rehydration was better explained by the exponential model. All the pre-treatments increased the effective moisture diffusivity and mass transfer coefficient, which increased the drying rate from 22.34 to 79.78 %. Pre-treatment led to an increase in appearance by an increase in L* and a* and a decrease in b*. The FTIR spectra showed the absence of a new functional group, but a change was observed in the characteristics band upon pre-treatment. The comparison of different pre-treatment showed that the CA + US pre-treatment had a better drying profile, whereas DW + US had a better antioxidant profile with the highest TPC (22.31 mg GAE/g), TFC (58.37 mg QE/g), DPPH inhibition (89.01 %), and ABTS assay (13.27 mg TE/g).