Ohmic thawing of frozen ground meat


BULGARIAN CHEMICAL COMMUNICATIONS, cilt.46, ss.121-125, 2014 (SCI İndekslerine Giren Dergi) identifier

  • Cilt numarası: 46
  • Basım Tarihi: 2014
  • Sayfa Sayıları: ss.121-125


In this study, the applicability of ohmic heating on tempering of the frozen ground meat was investigated. Ground beef meat has been shaped as a block of 1 cm 7 cm 10 cm in a specially designed container, and then frozen at air blast freezer (-30 degrees C). It was aimed to reach the center temperature of the frozen block meat to +20 degrees C from -18 degrees C. The ohmic tempering was performed by the application of different voltage gradients (10, 15 and 20 V cm(-1)) whereas conventional tempering was performed at controlled conditions in the refrigerator (4 degrees C). The effects of the thawing method and the voltage gradient on tempering time, temperature distribution, color and pH were investigated. As the voltage gradient increased, the tempering time decreased in the range of 92-95 % comparing to conventional tempering. Average initial thawing temperature was measured as -1.1 degrees C for the samples. At the end of the tempering, the cold point of the ground meat was 0 degrees C while the minimum temperature value of surface were -4.7 degrees C, -3.3 degrees C and -3.4 degrees C for 10, 15 and 20 V cm(-1) voltage gradients, respectively. Similarly, the thawing method and the voltage gradient affected the color properties (L*, a*, b*, Hue angle, chroma and total colour differences), significantly (p<0.05). The value of a*, which is important for meat samples, was similar for conventional thawing and ohmic thawing applied at 10 V cm(-1). It is thought that the results of this study will provide data for the scaling up of the industrial ohmic tempering or thawing systems and give useful insights to further studies on these subjects.