Improving Microwave Heating using Polysaccharides as Thickeners
L. M Guardeño, M. Hernández-Carrión, J. M Catala-Civera, P. Plaza, I. Pérez-Munuera, I. Hernandohttps://doi.org/10.17221/1085-CJFSCitation:M Guardeño L., Hernández-Carrión M., M Catala-Civera J., Plaza P., Pérez-Munuera I., Hernando I. (2009): Improving Microwave Heating using Polysaccharides as Thickeners. Czech J. Food Sci., 27: S342-S345.
The aim of this work was to improve microwave heating in white sauces using different polysaccharides in their formulation; ι-, λ- and &kappa-carrageenan and native and modified starches were used as thickeners. Five model systems were prepared, each one with a different polysaccharide, salt, and water. Dielectric loss factor (ε'') was measured and penetration depth of the electric field was calculated at 20 and 40°C at 2450 GHz. The results showed that ε'' increased significantly (P < 0.05) when temperature rose in all the model systems. Moreover, ε'' decreased significantly (P < 0.05) when the polysaccharide concentration rose in the systems elaborated with starch (both native and modified). The penetration depth increased significantly at 40°C when native starch concentration rose. Not significant differences due to the thickener concentration were found in the depth penetration values in the other model systems, both at 20 and 40°C.Keywords:polysaccharides; salt; starch; carrageenan; sauces; microwaves; microstructure; dielectric properties