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Asian-Australas J Anim Sci > Volume 30(4); 2017 > Article
Wei, Wang, Han, Chen, Xu, and Zhou: Effect of freezing on electrical properties and quality of thawed chicken breast meat

Abstract

Objective

The objective of this research was to study the electrical properties and quality of frozen-thawed chicken breast meat and to investigate the relationship between these parameters at different times of frozen storage.

Methods

Thawed samples of chicken breast muscles were evaluated after being kept in frozen storage at −18°C for different periods of time (1, 2, 3, 4, 5, 6, 7, and 8 months).

Results

The results showed that water-holding capacity (WHC) and protein solubility decreased while thiobarbituric acid-reactive substances content increased with increasing storage time. The impedance module of samples decreased during 8-month frozen storage. Pearson correlation coefficients showed that the impedance change ratio (Q value) was significantly (p<0.05) related to pH, color, WHC, lipid oxidation and protein solubility, indicating a good relationship between the electrical properties and qualities of frozen-thawed chicken breast meat.

Conclusion

Impedance measurement has a potential to assess the quality of frozen chicken meat combining with quality indices.

INTRODUCTION

Freezing is a commonly accepted method of food preservation to ensure the safety of meat products in the global meat export market [1]. The worldwide commercialization of meat calls for frozen meat which can be preserved for long periods of time with lower transportation cost and lower price compared with fresh meat [2].
Chicken meat, well-known for its high protein and low fat characteristics, is an important component in healthy diets [3]. The consumption of poultry meat has increased over decades and has reached high levels worldwide [4,5]. Due to the growth in consumer demand for safe poultry products, chicken meat quality assessment and control has become a necessity [6].
During frozen storage, there are series of physical and biochemical changes, such as water loss, color change, lipid and protein oxidation, which can influence the quality of frozen chicken meat [7]. Much research has been done on the biochemical changes in different meats during frozen storage [710], and the results indicate increases in moisture loss, protein denaturation, oxidation of lipids and protein, and changes in color, with the increasing of the freezing time.
Traditional methods based on physical and chemical measurements have been performed to evaluate the quality of frozen meat [11]. Recently some instrumental methods to assess the quality of frozen meat have been reported, including single cell gel electrophoresis assay, Raman spectroscopy, low field nuclear magnetic resonance, visible and near-infrared spectral, and cryo-scanning electron microscopy [1216]. Most of these measurements are accurate and visualized, reflecting the changes in frozen meat tissue by analyzing deoxyribonucleic acid (DNA), structures of protein, water distribution or ice crystal size. However, these methods are destructive in nature, relatively expensive, time-consuming and require skilled personnel.
One of the rapid, non-destructive and easy-to-use methods to analyze the quality of meat is bio-impedance [17]. Electrical impedance has been widely applied for the assessment of meat quality such as pH, fat content, tenderness and freshness [17,18]. Freezing and thawing of meat disrupts the cell membranes and changes the internal structure of biological materials, and thus the impedance and electrical properties of meat [18]. In this sense, recent research has been conducted on the properties of fresh and frozen–thawed fish using electrical methods. Fuentes et al [19] reported that impedance measurement could be used to differentiate between fresh and frozen-thawed sea bream. The research of Vidaček et al [20] showed the possibility of using electrical measurements to assess the freezing history of fish for up to 4-month storage. The study of Kent et al [21] revealed time and temperature of storage of frozen cod were well predicted with the dielectric method. However, there is little information available on the electrical properties of long period frozen poultry meat. The structure and component contents of chicken meat tissue are different from fish tissue. Fish meat is tender and contains a higher percentage of water and tends to deteriorate more easily [22]. Therefore, it is necessary to study the electrical properties of chicken meat which has a longer frozen preservation storage period in order to apply bio-impedance to poultry meat quality control.
In the present study, the electrical properties and qualities of thawed chicken breast meat during different frozen storage were investigated. The relationship between the electrical impedance and meat quality using attributes such as water-holding capacity (WHC) and protein solubility of frozen chicken meat at different times of the storage were evaluated. By analyzing the electrical properties and quality results, we aimed to test the use of impedance measurement as a potential method to evaluate the quality for predicting freezing history of frozen-thawed chicken meat.

MATERIALS AND METHODS

Materials

Fresh breast meat without visible fat and skin tissue from white-feather broiler chickens was purchased on the day of slaughter from a commercial meat processing plant (Yueda Group, Yancheng, Jiangsu, China). The meat was maintained at 4°C during transport to the laboratory. About 8 h after slaughter, samples were frozen in a plate freezer at −40°C. After fast freezing, samples were individually packed into moisture impermeable polyethylene bags and then stored −18°C for up to 8 months. At 0, 1, 2, 3, 4, 5, 6, 7, or 8 months of storage at −18°C, samples were thawed at 4°C for 12 h and analyzed.

Measurement of pH and color

The pH of meat samples was measured using a digital pH meter (Thermo-Scientific Trion Series, Milan, Italy). The color of the breast muscles was assessed for lightness (L*), redness (a*) and yellowness (b*) with a Konica Minolta colorimeter (CR-400, Osaka, Japan) in three different sample locations.

Water-holding capacity

Thawing, cooking and pressing loss were determined according to the method as described by Li et al [23] with slight modifications. Thawing loss was calculated as a percentage of weight loss before and after thawing.
Two pieces (4 cm×2 cm×2 cm 20±2 g) cut from a thawed sample were individually cooked in a 75°C water bath until the central temperature reached 70°C. The cooked samples were chilled to room temperature. Cooking loss was calculated as a percentage of weight loss before and after cooking.
Two 0.5 cm thick and 2.5 cm in diameter samples were re moved from each thawed sample using a cylinder sampler (inner diameter, 2.50 cm). Then samples were wrapped with 16 layers of tissue papers and pressed under a force of 350 N for 5 min using a compression machine (YYW-2, Nanjing Soil Instrument, Nanjing, China). Pressing loss was calculated as a percentage of weight loss before and after compression.

Lipid oxidation

The amounts of the thiobarbituric acid-reactive substances (TBARS) in minced breast meat samples were determined according to the method of Lund et al [24] and with slight modifications. A minced sample (5 g) was homogenized in 25 mL of 7.5% trichloracetic acid with 0.10% ethylenediaminetetraacetic acid using an Ultra Turrax for 30 s at 13,500 r/min and then filtered. Filtrate (2 mL) was then added to 2 mL of 0.02 M thiobarbituric acid and incubated in a 95°C water bath for 30 min to develop color. After cooling at room temperature, the absorbance of the sample was measured at 532 nm. The amounts of TBARS were expressed as mg of malondialdehyde per g of meat.

Protein solubility

The solubility of the sarcoplasmic and total (sarcoplasmic+ myofibrillar) proteins were determined according to the method as described by Joo et al [25] with slight modifications. Sarcoplasmic proteins were extracted from 1 g muscle using 20 mL of ice-cold 0.025 M potassium phosphate buffer (pH 7.2). The samples were minced, homogenized, and then left on a shaker at 4°C overnight. Samples were centrifuged at 3,000 g for 15 min and protein concentration in the supernatants was determined by the Biuret method. Total protein was extracted from 1 g muscle using 20 mL of ice-cold 1.1 M potassium iodide in 0.1 M phosphate buffer (pH 7.2). The same procedures for homogenization, shaking, centrifugation, and protein determination were used as described above. Myofibrillar protein concentrations were obtained by difference between total and sarcoplasmic protein solubility. The protein solubility was expressed as mg of protein per g of meat.

Impedance measurements

The impedance of the samples was measured with a LCR electric bridge (AT2827-1, Applent Electricity Technology CO. LTD, Changzhou, China). The external part consisted of two rows of six copper needles (diameter: 2 mm), which were twined by the copper wires. The distance between the rows was 3 cm while the distance was 1 cm between the pins in the same row (Figure 1). The modulus of the samples was measured at frequencies of 50 Hz and 200 kHz, while the voltage was set to 1 V as determined by others [26]. The impedance change ratio (Q value) was defined as Q = (ZL–ZH)×100/ZH. ZL and ZH are the modulus of the samples at the frequency of 50 Hz and 200 kHz, respectively [27].

Statistical analysis

Statistical analyses were performed using SAS 9.12 (SAS Institute Inc., Cary, NC, USA; 2003) and all data were expressed as the means±standard error of the mean values. Twenty replicates were used for determination of physicochemical parameters, and each replicate was measured in triplicate. Data were analyzed using analysis of variance according to Duncan’s multiple-range test at a significance level of p<0.05. To determine the correlation between the values of impedance measurements and other physiochemical parameters, the results were subjected to Pearson correlation coefficients using SAS.

RESULTS AND DISCUSSION

Measurement of pH, color, WHC, TBARS, and protein solubility

The L* value of fresh chicken breast meat (50.93) was significantly higher than that of thawed samples during the 1 to 8 months storage (p<0.05), however, there were no differences in L* values of any samples frozen for 1 to 8 months (Table 1). The a* value of the samples increased after the freezing treatment from 3.07 to 4.77, reaching a peak on the 1st month of frozen storage. Then the value declined to 2.14 on the 8th month of frozen storage with fluctuations. The b* value decreased from 8.23 to 3.72 during 0 to 4 month frozen storage, followed by a rise to 9.46 by 8 months of storage. The decreasing of L* value could be caused by a reduction of water retention which leads to a lower surface light reflectivity [28]. The accumulation of metmyoglobin (MetMb) at the surface of meat during storage contributes significantly to its discoloration [29], which could explain the changes in a* value. The increasing lipid oxidation and the formation of MetMb are the main factors leading to the changes in b* value as well [30].
The pH of the fresh chicken meat was 6.09, which was significantly higher than that when thawed (p<0.05) (Table 1). This value dropped to 5.96 for samples frozen for 1 month, and it remained no higher than 5.99 among groups of different frozen storage durations. Previous studies have shown that freezing with subsequent exudate release and the loss of water from the meat may cause an increase in the concentration of the solutes, resulting in a decrease in the pH of thawed meat [1].
Cooking losses and pressing losses showed lower values for fresh meat (15.77% and 23.86% respectively) and higher values for frozen-thawed meat rising to 20.89% and 35.06% respectively with fluctuations after 8 months of freezing (Table 2). Thawing losses grew from 2.53% to 4.27% with the increasing time up to 6 months of frozen storage, followed by a slight decline and ended up by 3.93%. These results indicated that WHC of frozen-thawed chicken meat tended to decrease gradually (increased thawing cooking and pressing loss). This is in accordance with the results of a study on thawed beef [9]. The rising cooking and pressing losses indicated an increase in protein denaturation with the attendant loss of ability to hold water. The growing thawing loss probably resulted from the rupture of cell structures and tissues caused by ice crystal growth during the freezing process and time of storage [31].
There was a gradual rise from 0.093 to 0.125 mg/kg in the TBARS content of chicken breast meat during 0 to 5 months frozen storage (Table 3). The content of TBARS witnessed a significant rise to 0.159 mg/kg on the 7th months of storage (p<0.05), and continued increasing to 0.202 mg/kg by 8 months of the frozen period. Similar behaviors have been observed in other studies on chicken meat [7]. Lipid oxidation during storage is a critical factor that can affect sensory characteristics of meat [32]. The results of the TBARS content explained the sudden rise of b* value during 6 to 8 months frozen storage as well [33,34].
With increasing freezing time, the solubility of total protein, sarcoplasmic protein and myofibrillar protein in thawed samples experienced a downward trend, with a slight increase on the 3rd month of storage (Table 3). The solubility of total protein and sarcoplasmic protein fell from 247.28 to 201.70 mg/g and from 99.77 to 77.06 mg/g respectively with slight rises by the end, while the solubility of myofibrillar protein dropped from 147.51 to 123.81 mg/g with a slight rise on the 7th month of storage. Farouk et al [9] and Niu et al [35] reported similar results in the study of quality of beef and chicken breast meat. The results indicated a denaturation of total protein, sarcoplasmic protein and myofibrillar protein during the frozen storage period, which could be caused by the formation of hydrogen, disulfide and salt bonds [8,35].

Impedance measurements

The impedance module of fresh chicken breast meat and thawed samples at 1, 2, 3, 4, 5, 6, 7, and 8 months of frozen storage are shown in Figure 2. The results showed that the impedance module of fresh meat (268.01 Ω and 117.93 Ω respectively) was significantly higher than that of those thawed at frequencies of 50 Hz and 200 kHz (p<0.05). These findings are in accordance with those obtained by Fuentes et al [19] on fish muscle. With increasing time of the frozen storage, the modules of thawed meat at both frequencies decreased with fluctuations. The modules at the frequency of 50 Hz declined from 190.17 Ω to 166.49 Ω, while the modules at the frequency of 200 kHz reached the lowest values (94.12 Ω) on the 5th month and ended up at 95.08 Ω by the 8th month of storage. Previous studies on fish have showed that impedance of frozen-thawed grass carp decreased during a 10-day frozen storage [36]. The cell membrane acts as an insulator at low frequencies, behaving as a capacitor [17]. The membranes are intact in fresh meat, but in frozen-thawed samples cell membranes become destroyed [1]. The destruction of the cell membranes reduces the capacitive component of the biological tissues and increases the amount of free electrolytes in the tissue, increasing its conductivity and producing a decrease of the impedance module [19]. So the impedance module of fresh meat is much higher than in those thawed. However, the impedance of biological tissues changes much more slowly during the frozen storage [18]. The growth of ice crystals, denaturation of proteins, oxidation of lipids, and leakage of fluid from meat tissue during the frozen storage could contribute to the decrease of the impedance module.
The Q value of the fresh and frozen–thawed samples is presented in Table 4. The Q value of fresh meat was 127.11%, which was significantly higher than that of frozen-thawed (p<0.05). The Q value of frozen-thawed samples increased from 77.84% to 83.95% with the extension of frozen storage time, followed by a decrease to 71.54% on the 6th month of storage. The value then rose to 75.44% by the end of frozen storage period. Biological tissues are composed of cells that are surrounded by extracellular fluid. Low-frequency current bypasses the cells through the extracellular fluid, while high-frequency current flows through the plasma membranes capacitance and cells [37,38]. After a frozen-thawed process, the muscle cells are damaged, which concentrate the solutes in meat. The cell cytoplasm as well as the surrounding extracellular fluid change in electrical conductivity [39]. This change in conductivity would lead to lower Q values in thawed chicken meat samples. It can be seen in Figure 2 that the modules of frozen-thawed samples decreased more rapidly after 4 months of storage at the frequency of 50 Hz, while at the frequency of 200 kHz the change was slower after 3 months of storage. Therefore, as time of frozen storage increased, the Q values increased up to the 4th month of storage and declined by the end of the period. These impedance results could be explained by the theory mentioned above.
Pearson correlation coefficients were used to study the relationships between the quality indices and the electrical properties of frozen-thawed chicken breast meat. The correlations between pH, color, WHC, TBARS, protein solubility and the Q value are shown in Table 5. The color of frozen-thawed samples was significantly (p<0.05) related to WHC, TBARS, and protein solubility, confirming that the reduction of water retention and the increasing oxidation affected color change of frozen chicken meat. Protein solubility was significantly (p<0.001) correlated with TBARS, which indicated that there were interactions between protein denaturation and lipid oxidation during frozen storage. The Q value was not significantly related to a* value and b* value (p>0.05). The pH, L* value and protein solubility all had positive correlations with Q value, while other characteristics had negative correlations. The Q value was significantly (p<0.001) related to L* value, WHC, total protein and sarcoplasmic protein solubility, showing that the distribution of cellular liquid in meat tissues and denaturation of proteins affected the electrical properties of frozen-thawed chicken meat. Significant relationships between the Q value and other quality indicators (p<0.01) demonstrated that lipid oxidation and pH which were closely linked to the concentration of the solutes led to changes in electrical properties. The results showed that the deterioration in the quality of meat was closely linked to changes of the electrical properties.
Several studies have been performed relating the application of electrical measurements to estimating the quality of meat and fish. Kent et al [21] obtained a good relationship between sensory variables and dielectric parameters, which could predict time and temperature of storage of frozen cod. Vidaček et al [20] studied the impedance magnitude and phase of frozen-thawed fish and obtained promising results showing the possibility of a rapid and non-invasive assessment of the freezing history. Fuentes et al [19] detected changes in the degree of lipid oxidation, WHC and several textural parameters relating to the sensory quality of sea bream submitted to freezing-thawing processes, using the impedance spectroscopy technique. Therefore, electric conductivity can be applied to determine the component changes, thus predicting the freezing history of fish meat. Furthermore, Zhang et al [27] and Zhu et al [39] both found that it was practical to use Q values to evaluate the freshness of grass carp and bighead carp heads within a certain period of storage as a rapid, non-destructive method. In this study, good correlations were found between Q values and traditional quality indices as well as the degradation of protein for frozen-thawed chicken breast muscles. Although the structure and components of chicken meat are different from fish meat which has a shorter frozen preservation storage period [22], the results demonstrated that quality and electrical property of frozen-thawed chicken meat were closely linked, indicating the potential to predict the freezing history of chicken meat by impedance. To facilitate the application of impedance technology, further research should be conducted on predicting frozen storage time by using impedance value combined with quality indices for better quality control in poultry meat.

CONCLUSION

The good correlations between Q values and quality indices demonstrated that there was a good relationship between the electrical properties and qualities of thawed chicken breast meat during the period of frozen storage. The decreasing of WHC and protein solubility as well as the changes in color, pH and TBARS were closely related to the changes in impedance at different times of the frozen storage. By way of conclusion, the method of impedance measurement could be applied in the poultry industry to facilitate meat quality control. It is more reliable to assess the quality and the freezing history of frozen chicken meat using electrical properties together with quality attributes. These results are preliminary and further research should be carried out on the application of impedance measurement combining traditional quality indices in poultry meat quality control.

ACKNOWLEDGMENTS

This work was supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAP), China Agriculture Research System (CARS-42), and National Science & Technology Pillar Program during the Twelfth Five-Year Plan Period of China (2012BAD28B01).

Notes

CONFLICT OF INTEREST

We certify that there is no conflict of interest with any financial organization regarding the material discussed in the manuscript.

Figure 1
Photograph showing the impedance machine (left) and the probe (right) used in this work.
ajas-30-4-569f1.gif
Figure 2
Impedance of chicken breast meat changes at the frequencies of 50 Hz and 200 kHz. Different superscript letters (a–d) in the column show significant difference (p<0.05) between the different frozen time groups.
ajas-30-4-569f2.gif
Table 1
Effects of time of frozen storage on pH and color (L*, a*, and b*) of chicken breast meat
Storage time (m) pH1) L* a* b*
0 6.09±0.10a 50.93±2.64a 3.07±0.81c 8.23±1.14a
1 5.96±0.21b 48.54±3.18b 4.77±0.99a 4.10±0.95cd
2 5.97±0.15b 47.18±1.19b 4.64±0.72a 3.79±0.95d
3 5.99±0.26ab 47.41±1.85b 3.33±0.73bc 3.80±0.98d
4 5.99±0.17ab 47.22±1.87b 3.74±0.78b 3.72±0.85d
5 5.97±0.19b 47.38±2.05b 2.22±0.99d 4.74±0.95c
6 5.95±0.10b 48.02±1.53b 4.47±1.06a 6.59±2.09b
7 5.94±0.12b 47.94±2.16b 1.91±0.81d 8.81±1.47a
8 5.99±0.11ab 47.05±2.71b 2.14±0.82d 9.46±2.04a

L*, lightness; a*, redness; b*, yellowness; SE, standard error.

1) Values for pH and color are means±SE, n = 20.

Different superscript letters (a–d) in the column show significant difference (p<0.05) between the different frozen time groups.

Table 2
Effects of time of frozen storage on WHC of chicken breast meat
Storage time (m) Thawing loss (%)1) Cooking loss (%) Pressing loss (%)
0 - 15.77±1.92f 23.86±1.84d
1 2.53±1.13c 17.35±1.57de 31.35±4.71c
2 2.61±1.52bc 16.43±1.34ef 34.36±2.91a
3 3.29±1.32abc 17.85±1.52cd 36.07±2.21ab
4 3.38±1.05abc 22.17±2.53ab 35.60±2.45a
5 3.37±2.23abc 22.34±2.61a 35.98±2.92a
6 4.27±1.37a 19.06±1.91c 34.58±2.31ab
7 3.70±1.62ab 21.10±1.48ab 33.04±3.13bc
8 3.93±1.99a 20.89±2.23b 35.06±3.90ab

WHC, water-holding capacity; SE, standard error.

1) Values for thawing, cooking and pressing losses are means±SE, n = 20.

Different superscript letters (a–f) in the column show significant difference (p<0.05) between the different frozen time groups.

Table 3
Effects of time of frozen storage on TBARS and protein solubility of chicken breast meat
Storage time (m) TBARS (mg/kg)1) TPS (mg/g) SPS (mg/g) MPS (mg/g)
0 0.093±0.01e 247.28±22.44a 99.77±8.93a 147.51±17.24a
1 0.094±0.02e 235.08±15.12b 92.63±12.19b 142.45±18.38ab
2 0.097±0.04e 217.41±17.18c 82.91±5.38c 134.50±16.27bc
3 0.115±0.01de 218.97±15.75c 83.50±5.68c 135.47±12.78b
4 0.124±0.01cd 214.52±13.79c 81.09±6.16cd 133.43±13.62bcd
5 0.125±0.02cd 214.35±11.33c 81.59±7.39cd 132.76±14.69bcd
6 0.141±0.04bc 203.45±16.57d 79.90±6.81cd 123.55±15.80d
7 0.159±0.03b 201.70±16.74d 77.06±5.00d 124.67±14.73cd
8 0.202±0.06a 202.73±12.79d 79.00±5.85cd 123.81±11.76d

TBARS, thiobarbituric acid-reactive substances; TPS, total protein solubility; SPS, sarcoplasmic protein solubility; MPS, myofibrillar protein solubility; SE, standard error.

1) Values for TBARS, TPS, SPS and MPS are means±SE, n = 20.

Different superscript letters (a–e) in the column show significant difference (p<0.05) between the different frozen time groups.

Table 4
Effects of time of frozen storage on Q values of chicken breast meat
Storage time (m) Q value1) (%)
0 127.11±18.63a
1 77.84±7.63bcd
2 81.10±7.05bc
3 83.93±7.84b
4 83.95±10.35b
5 82.63±8.53b
6 71.54±11.31d
7 73.31±6.66d
8 75.44±9.98cd

Q value, the impedance change ratio; SE, standard error.

1) Values for Q values are means±SE, n = 20.

Different superscript letters (a–d) in the column show significant difference (p<0.05) between the different frozen time groups.

Table 5
Pearson correlation coefficients between measured variables of chicken breast meat
Variables pH L* a* b* CL PL TBARS TPS SPS MPS Q value
pH 1 0.002 −0.017 0.039 −0.119 −0.152* −0.035 0.116 0.163* 0.050 0.231**
L* 1 −0.049 0.221** −0.162* −0.308*** −0.201** 0.266*** 0.233** 0.198** 0.263***
a* 1 −0.385*** −0.280*** −0.074 −0.294*** 0.183* 0.182* 0.124 −0.069
b* 1 −0.101 −0.245*** 0.401*** −0.096 −0.074 −0.078 0.118
CL 1 0.422*** 0.365*** −0.306*** −0.333*** −0.191* −0.373***
PL 1 0.233** −0.421*** −0.497*** −0.240** −0.562***
TBARS 1 −0.420*** −0.377*** −0.308*** −0.273**
TPS 1 0.638*** 0.890*** 0.453***
SPS 1 0.217** 0.496***
MPS 1 0.280**
Q value 1

L*, lightness; a*, redness; b*, yellowness; CL, cooking loss; PL, pressing loss; TBARS, thiobarbituric acid-reactive substances; TPS, total protein solubility; SPS, sarcoplasmic protein solubility; MPS, myofibrillar protein solubility; Q value, the impedance change ratio.

* p<0.05;

** p<0.01;

*** p<0.001.

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