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Effect of high voltage electrostatic field treatment on thawing characteristics and post-thawing quality of lightly salted, frozen pork tenderloin

Author:
Jia, Guoliang, Sha, Kun, Meng, Jin, Liu, Haijie
Source:
Lebensmittel-Wissenschaft + [i.e. und] Technologie 2019 v.99 pp. 268-275
ISSN:
0023-6438
Subject:
Pseudomonas, air, denaturation, drip loss, electric potential, enthalpy, myosin, pork, salt concentration, thawing, thermal properties
Abstract:
The thawing characteristics, initial thawing mechanism and post-thawing quality of lightly salted, frozen pork tenderloin following the use of high-voltage electrostatic fields (HVEFs) were investigated in this study. The thawing rate increased with increasing salt concentrations for pork thawed by a −10 kV or −15 kV HVEF. Thermal property values of pork changed with increasing salt concentration (0–6%). HVEFs could enhance salt diffusion during the thawing process. The pork tenderloin thawed using HVEFs had significantly less drip loss (P < 0.05) than occurred during air thawing, which was also proven by the myosin denaturation enthalpy (−0.05 ± 0.03 J/g for the air-thawed samples and −0.24 ± 0.03 for the −10 kV HVEF-thawed samples). Additionally, there is apparent sample grouping with respect to the thawing methods between 30 ms–100 ms after PCA analysis. Thawing with −10 kV and −15 kV HVEFs resulted in a 0.5 log reduction in the number of Pseudomonas in the pork tenderloin compared with the number in the air-thawed group at day 0.