ELECTRICAL CONDUCTIVITIES of SELECTED SOLID FOODS DURING OHMIC HEATING¹

Abstract

Electrical conductivities of three vegetable and two meat samples were determined by subjecting them to a constant voltage power supply in a static ohmic heating device. Conductivities of vegetable samples were increased by soaking them in salt solutions, while soaking in water resulted in reduced conductivity due to leaching of electrolytes. Conductivities under ohmic heating conditions increased linearly with temperature. When field strengths were decreased, the conductivity‐temperature curve gradually became nonlinear, and under conventional heating conditions, a sharp transition was observed.

Electrical conductivity of particle–fluid mixtures in ohmic heating: Measurement and simulation

“…The EC (r, s/m) was determined from the resistance of the sample and the geometry of the cell using the following equation (Palaniappan & Sastry, 1991):…”

Caracterización fisicoquímica, funcional y química de harinas nixtamalizadas de maíz obtenidas por calentamiento óhmico y proceso tradicional

“…Las diferencias encontradas en la HCO procesada con humedad de 450 g agua/kg maı´z y 908C pueden ser debidas a la electroporacio´n de la membrana del almido´n, ocasionando una mayor lixiviacio´n de los componentes del gra´nulo principalmente de amilosa. Esto podrı´a ser deberse a un tiempo prolongado al campo ele´ctrico con poco agua (An & King, 2007;Camargo et al, 2010;Lima & Sastry, 1999;Palaniappan & Sastry 1991); sin embargo habrı´a que realizar un estudio ma´s profundo al respecto.…”

Processing of cauliflower by ohmic heating: influence of precooking on firmness

“…The electrical conductivity (s) exhibited a linearly increasing trend with temperature during the heating phase, con®rming previous work. 23,24 The mean values of s measured at 30°C are presented with the mean time to reach the holding temperature of 135°C (Table 7). These values were similar for all treatments showing that the selected concentrations of saline solutions were appropriate.…”