Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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Effect of Sodium Bicarbonate Injection in Pre-rigor Porcine M. Longissimus lumborum on Pork Quality

  • Yang, H.S. (Division of Applied Life Science, Graduate School, Gyeongsang National University) ;
  • Moon, S.S. (Division of Applied Life Science, Graduate School, Gyeongsang National University) ;
  • Jeong, J.Y. (Division of Applied Life Science, Graduate School, Gyeongsang National University) ;
  • Choi, S.G. (Division of Applied Life Science, Graduate School, Gyeongsang National University) ;
  • Joo, S.T. (Division of Applied Life Science, Graduate School, Gyeongsang National University) ;
  • Park, G.B. (Division of Applied Life Science, Graduate School, Gyeongsang National University)
  • Received : 2005.10.11
  • Accepted : 2006.02.01
  • Published : 2006.06.01
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Abstract

Effects of sodium bicarbonate (SBC) injection on meat quality and functionality of porcine M. longissimus lumborum were investigated. Fifteen pigs ($100{\pm}5kg$) were randomly selected at a commercial slaughter plant. After slaughtering the loins were dissected from the carcass before chilling at approximately 30 minutes post mortem. The loins were divided into four cuts for sample treatment, and SBC of 0.25 M, 0.40 M and 0.75 M was injected (2% w/w) using a syringe. As SBC injection level was increased, muscle pH increased significantly (p<0.05). SBC injection decreased lightness ($L^*$) values on the surface of muscle. Moreover, with injection of SBC, drip loss %, cooking loss % and shear force were significantly (p<0.05) decreased, whereas WHC and $Na^+$ content were significantly (p<0.05) increased. From panel testing of uncooked pork loin, no significant differences (p>0.05) were found in aroma, off-flavor and drip between injection of SBC at different levels and the control, although color and acceptability were significantly lower (p<0.05) in control pork loin compare with injection of SBC at 0.75 M. In cooked pork loin from the panel test, aroma, flavour, off-flavour and juiciness were found to be similar (p>0.05) on all treatments, but tenderness and acceptability were significantly higher (p<0.05) with injection of SBC at 0.75 M than for control loin. Myofibrillar protein solubility of muscles treated with SBC was significantly (p<0.05) higher than that of the control, although no significant differences (p>0.05) were found in sarcoplasmic protein solubility between the treatments. These results indicated that SBC injection into pre-rigor porcine M. longissimus lumborum could improve ultimate pork quality characteristics such as meat color, water-holding capacity, and could inhibit muscle protein denaturation due to an increase in muscle pH.

Keywords

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