Rheological Behavior of Pineapple Juice with Suspended Dietary Fiber Powder from Lime Residues

Abstract

Lime residue powder, a rich source of dietary fiber (DF) and antioxidants, was used to supplementpineapple juice in order to provide a new pleasant odor and increase the dietary fiber of the juice. Theeffects of particle size (38-63, 63-125, 125-180 and 180-250 m) and concentration (1-5% w/v) of thepowder on the physical characteristics of the supplemented juice were determined. At 30°C, all samplesexhibited a pseudoplastic behavior with the exception of the juice suspended with a 1% powder comprisingparticles of the smallest size range which behaved like a Newtonian fluid. An increase in viscosity wasobserved for juices with larger particle sizes and higher concentrations of powder. The viscosities of thesamples increased significantly and all samples became more pseudoplastic after storage at 4°C for 1 day.

Keywords : Lime Residues / Particle Size / Viscosity / Rheological Behavior / Dietary Fiber