Abstract:The traditional indicators of pickled cucumber for vacuum acetic impregnation include acidity, texture profile, salinity and nitrite content. The dielectric properties of vacuum impregnated pickled cucumber were measured at 100 kHz~12 MHz frequency range from different time using a fast nondestructive method with parallel-plate capacitor. The results showed that both dielectric constant and loss factor of vacuum-impregnated pickled cucumber decreased monotonically as frequency increased. Negative correlations between dielectric parameters and vacuum impregnated time were observed. Dielectric parameters presented positive correlations with salt and nitrite contents, but no obvious relationship were remarked with acidity and texture profile. At 2.26 MHz and 12 MHz, R2 of the linear regression equations for dielectric constant and salt content were 0.9813 and 0.9858, respectively. Dielectric measurement provided new information concerning pickled vegetables for vacuum impregnation.
