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Thermal conductivity factor for beef of NOR and DFD grades at the subcryoscopic temperatures

https://doi.org/10.21323/2414-438X-2021-6-3-285-290

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Abstract

Thermal conductivity factor and specific isobaric heat capacity of food products are currently the most important parameters in the development of mathematical models for food freezing and thawing and in improving production technology. There is significant variance among the existing experimental data for the thermal conductivity factor in meat. Most of the modern calculated relationships are based on the nutritional approach, which favorably differs by the ability to calculate the thermophysical characteristics of any food products. However, the calculation error at the subcryoscopic temperatures may be 15% to 20%. The development of superchilling as a way of storing meat requires high accuracy of freezing time calculation, including vacuumpacked boneless meat. In the presented article, the authors investigated hydrogen index, cryoscopic temperature, frozen moisture proportion and thermal conductivity factor for beef M. longissimus dorsi samples of NOR and DFD grades. It was found that DFD beef is characterized by 10% to 12% higher values of thermal conductivity factor in comparison with NOR grade. Using the method of regression analysis, the authors developed empirical relationships for calculating the thermal conductivity factor of meat depending on its temperature and pH level. Unlike cryoscopic temperature and frozen moisture proportion, pH is easy to measure and may be easily used on a conveyor belt for more accurate assessment of meat thermophysical properties. With an increase in pH from 5.3 to 7, an increase in cryoscopic temperature is observed from minus 0.94 °C to minus 0.72 °C. It has been shown that one of the factors for the higher cryoscopic temperature and higher pH level of DFD beef is higher water-holding capacity with less strongly bound moisture.

About the Authors

Yu. M. Berezovsky
All-Russian Scientific Research Institute of Refrigeration Industry
Russian Federation

 doctor of technical sciences, the head of the laboratory, research laboratory of Food Products Thermophysical Properties

12, Kostyakova str., 127422, Moscow, Russia

Tel.: +7–909–685–49–83



I. A. Korolev
All-Russian Scientific Research Institute of Refrigeration Industry
Russian Federation

 candidate of technical sciences, researcher, research laboratory of Food Products Thermophysical Properties

12, Kostyakova str., 127422, Moscow, Russia

Tel.: +7–916–423–42–17



T. A. Sarantsev
All-Russian Scientific Research Institute of Refrigeration Industry
Russian Federation

 research engineer, research laboratory of Food Products Thermophysical Properties

12, Kostyakova str., 127422, Moscow, Russia

Tel.: +7–915–282–18–24



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For citation:


Berezovsky Yu.M., Korolev I.A., Sarantsev T.A. Thermal conductivity factor for beef of NOR and DFD grades at the subcryoscopic temperatures. Theory and practice of meat processing. 2021;6(3):285-290. https://doi.org/10.21323/2414-438X-2021-6-3-285-290

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