Synergism between sodium chloride, sucrose and tricalcium phosphate in the osmotic dehydration of oca (Oxalis tuberosa) with and without chitosan coating
2010
José Arroyo Portal | Hubert Arteaga Miñano | Raúl Siche Jara
We investigated the synergistic effect of three solutes (sodium chloride, sucrose, tricalcium phosphate) in different combinations of concentration, on the moisture, solid gain and calcium gain in oca (Oxalis tuberosa) with and without chitosan (CR and SR). In both cases applied the Simplex with Extended Centroid mixture design. Were used cylinders of oca of 0.9 cm of diameter and 3.4 cm of length. The kinetics of moisture, solid gain and calcium gain for 48 hours was evaluated. The effective diffusivity of water, solids and calcium was determined. We found that in samples CR is greater loss of water and less solid gain compared with SR samples mainly as sodium chloride or sucrose participate independently, while for the gain of calcium, in all cases, the CR samples gain more of calcium than SR samples. The effective diffusivities found are: water, 1.19E-09 m2 /s in samples CR and 1.34E-09 m2 /s in SR samples; for solid, 3.67E-09 m2 /s in samples CR and 5.43E-09 m2 /s in SR samples; and, for calcium 3.32E-11 m2 /s in samples CR and 1.57E-09 m2 /s in SR samples.
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