Effect of High Pulsed Electric Field Pretreatment on Dielectric Constant of Apples
Message obtained by dielectric properties measuring of biological materials could be used for pro-cess monitoring and quality assessment of agricultural products. High pulsed electric field pretreat-ment can improve the efficiency of subsequent processing and influence the quality of agricultural products. Analysis of dielectric constant change of high pulsed electric field pretreated materials would contribute to understanding mechanism of high pulsed electric field and optimizing process-ing technology of agricultural products. Our present study is devoted to investigation the effect of high pulsed electric field treatments on apple tissue. Dielectric constant were measured before and after apple samples were subjected to HPEF treatments using varying field strengths of 1 kV/cm, 2 kV/cm and 3 kV/cm, pulse number of 92, pulse duration of 65 /is and pulse interval of 500 ms. Frequency characteristics of dielectric constants of apple tissues were analyzed over selected fre-quency ranges. Changes in dielectric constants versus time were detected before and after high pulsed electric field pretreatments within 30 min. Certain regularity were found in the apple dielec-tric constant change after different pretreatments: decreases in dielectric constants with increases in frequency were observed both in pretreated and untreated apple samples, but the degrees of reduction were different; at most test point during 30 min after high pulsed electric field pretreat-ment, values of dielectric constant were lower as compared to those at preceding time points except individual ones. The variation of dielectric constant after pretreatment of 3 kV/cm showed obvious differences from variations of another two.
Dielectric Constant High Pulsed Electric Field Treatment Electric Field Strength
Ying Wang Yuming Guo
College of Engineering, Shanxi Agricultural University, Taigu, 030801, P. R. China
国际会议
南昌
英文
1170-1174
2010-10-22（万方平台首次上网日期，不代表论文的发表时间）