Waste and Biomass Valorization, 2026 (SCI-Expanded, Scopus)
Abstract: In the present study, the effect of different drying techniques including refractance window drying (RW), freeze drying (FD), oven drying (OD) and spray drying (SD) on the physicochemical and functional properties of pectin extracted from orange peel was comparatively investigated. The esterification degree of the obtained pectins ranged between 81.02 and 84.84%, and it was determined that the pectin obtained by drying with RW had the highest esterification degree. The viscosity, gel strength and gel grade of the pectin solutions prepared with pectins dried by RW and FD were determined to be higher than the others. The pectins obtained by FD and SD had better solubility. Pectin powders produced using RW and FD methods generally exhibit superior properties compared to others. According to the results obtained, it has been determined that the RW drying technique can be used as a good alternative method for drying wet pectin precipitate in pectin production.