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Table 3 Antioxidant status, protein degradation and lipid oxidation in infraspinatus (IS) and gluteus medius (GM) muscles in goats during postmortem chill storage

From: Comparison of myofibrillar protein degradation, antioxidant profile, fatty acids, metmyoglobin reducing activity, physicochemical properties and sensory attributes of gluteus medius and infraspinatus muscles in goats

   Storage time (days) P value
Parameter Muscle 0 1 4 7 Storage Storage × muscle
α-tocopherol (mg/kg) IS 2.19 ± 0.130a 2.01 ± 0.100b 1.43 ± 0.061c 1.16 ± 0.020c <.0001 0.192
  GM 2.14 ± 0.111a 1.93 ± 0.120b 1.40 ± 0.032c 1.23 ± 0.040c 0.0012  
  P value 0.217 0.140 0.223 0.123   
γ-tocopherol (mg/kg) IS 0.69 ± 0.051a 0.65 ± 0.052a 0.41 ± 0.010b 0.23 ± 0.020c <.0001 0.237
  GM 0.70 ± 0.022a 0.65 ± 0.021a 0.44 ± 0.040b 0.27 ± 0.010c <.0001  
  P value 0.532 0.112 0.267 0.417   
δ-tocopherol (mg/kg) IS 0.08 ± 0.011 0.08 ± 0.012 0.07 ± 0.011 0.07 ± 0.011 0.109 0.280
  GM 0.12 ± 0.031 0.10 ± 0.011 0.09 ± 0.021 0.09 ± 0.031 0.204  
  P value 0.211 0.234 0.091 0.094   
Total carotenoid (mg/kg) IS 0.27 ± 0.010a 0.23 ± 0.011a 0.18 ± 0.012b 0.11 ± 0.010c <.0001 0.447
  GM 0.25 ± 0.030a 0.22 ± 0.012a 0.15 ± 0.041b 0.10 ± 0.030c 0.004  
  P value 0.901 0.548 0.071 0.361   
Catalase1 IS 1828.9 ± 27.23y 1820.0 ± 20.83y 1844.2 ± 21.91y 1816.3 ± 26.80y 0.190 0.135
  GM 1666.2 ± 11.80x 1767.0 ± 10.20x 1515.2 ± 12.11x 1700.2 ± 17.10x 0.219  
  P value 0.012 0.009 0.034 0.022   
SOD2 IS 3.14 ± 0.161y 3.07 ± 0.121y 3.31 ± 0.212y 3.17 ± 0.05y 0.742 0.221
  GM 2.70 ± 0.132x 2.45 ± 0.143x 2.87 ± 0.111x 2.78 ± 0.05x 0.092  
  P value 0.030 0.002 0.043 0.012   
GPX3 IS 66.75 ± 2.621 63.42 ± 3.500 65.03 ± 2.772 63.01 ± 0.940 0.806 0.156
  GM 65.20 ± 1.600 59.89 ± 1.250 63.11 ± 2.112 62.22 ± 1.332 0.418  
  P value 0.190 0.090 0.301 0.128   
TBARS (mg MDA/kg) IS 0.12 ± 0.010c 0.15 ± 0.011c 0.19 ± 0.010b 0.28 ± 0.010a <.0001 0.173
  GM 0.11 ± 0.010c 0.13 ± 0.020c 0.18 ± 0.030b 0.26 ± 0.031a <0.001  
  P value 0.130 0.273 0.112 0.367   
Carbonyl (nmol/mg protein) IS 1.08 ± 0.041a 1.43 ± 0.130a 2.47 ± 0.291b 3.63 ± 0.120cx <.0001 0.451
GM 1.09 ± 0.010a 1.35 ± 0.120a 2.50 ± 0.122b 3.01 ± 0.221cy <.0001  
  P value 0.231 0.154 0.347 0.035   
Free thiol (nmol/mg protein) IS 52.89 ± 1.671a 49.75 ± 1.302a 45.91 ± 1.380b 39.25 ± 1.711c 0.014 0.234
  GM 55. 82 ± 1.220a 52.86 ± 1.112a 48.00 ± 1.091b 41.01 ± 1.000c 0.021  
  P value 0.213 0.437 0.815 0.200   
  1. a, b c means having different superscripts along the same row are significantly different (P < 0.05). x, y means with different superscript along the same column are significantly different (P < 0.05). 1catalase activity is expressed as nmol.H2O2/min/mg protein. 2superoxide dismutase is expressed as the amount of enzyme needed to inhibit 50 % dismutation of the superoxide radical. 3glutathione peroxidase activity is expressed as nmoles NADPH oxidized/min/mg protein