In order to explore the feasibility of ohmic heating thawing for frozen Pseudosciaena crocea, direct and immerse ohmic heating methods were used for thawing, respectively taking air thawing and running water thawing as control groups, the real-time temperature of each part of Pseudosciaena crocea was tested, and the thawing time and uniformity were used as evaluation index. The results show that direct ohmic heating can shorten thawing time effectively, but thawing is uneven and the biggest temperature difference is 30.2℃, which is not suitable for thawing frozen Pseudosciaena crocea; immersed ohmic heating is more suitable for the thawing, with the thawing speed almost one time faster compared to the control group and with a better thawing uniformity. In order to master the process parameters of immersed ohmic heating, effects of different power modes, voltages and electrolyte concentrations on thawing were researched. The results show that power mode (direct current or alternating current) has no significant influence on thawing, 220V is the most suitable voltage for Pseudosciaena crocea thawing, and electrolyte concentration at 1% has a best thawing effect. After comprehensive analysis, it is confirmed that the ohmic heating thawing process for frozen Pseudosciaena crocea (weight about 500g) is to immerse it in 1% NaCl, use 220 v alternating current electricity for 18 minutes, and the terminal temperature is 5.2℃.
OUYANG Jie
,
NI Jin
,
SHEN Jian
,
ZHANG Junwen
,
TAN Jiayu
. Study on process parameters of ohmic heating thawing for frozen pseudosciaena crocea[J]. Fishery Modernization, 2016
, 43(3)
: 55
-59
.
DOI: 10.3969/j.issn.1007-9580.2016.03.011