ผลของอุณหภูมิการแช่เย็นขั้นปฐมภูมิต่อการสูญเสียน้ำหนักของซากสุกรและคุณภาพ ของเนื้อสันนอก (EFFECT OF PRIMARY CHILLING TEMPERATURE ON WEIGHT LOSS OF PORCINE CARCASS AND QUALITY OF SIRLOIN MEAT)
Keywords:
Primary Chilling Temperature, Porcine Carcass, pH, Shear Force, Weight LossAbstract
This research aimed at investigating effect of primary chilling temperatures under high humidity on weight loss and sirloin meat quality. Three primary chilling temperatures (-5°C, -10°C and -20°C) were applied to porcine carcasses until their temperatures reached 35°C. Subsequently, the carcasses were conventionally chilled (secondary chilling) at 0°C for 22 h. The results showed that primary chilling temperature did not show significant effect on pH of carcasses (P>0.05). The pH of carcasses decreased to 6.40-6.87 and 5.90-6.20 after 45 min and 24 h post mortem, respectively. The lowest weight loss of 1.57±0.17% was found in sample undergone primary chilled at -20°C. This might be due to the ice glazing as a protecting agent during carcass chilling. After overnight chilling, carcasses were cut and sirloin meat was chilled before determining its qualities. Primary chilling temperature significantly affected shear force (P<0.05) but not drip loss of the raw meat (P>0.05). Raw meat experienced primary chilled at -20°C had the significantly lowest shear force of 2.17+0.96 kg/cm2. However, there was no significant difference in cooking loss and texture quality of meat after cooking (P>0.05). The study indicates that lowering primary chilling temperature could improve weight loss of sirloin meat without significant effect on its texture quality.
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