Effect of Aging Time on Physicochemical Meat Quality and Sensory Property of Hanwoo Bull Beef

This study was conducted to investigate the meat quality and sensory properties of 12 major cuts from 10 Hanwoo bulls (25-32 monof age) after they were aged at 2°C for 0, 7, 14, and 21 d. Protein content (%) was between 19.17 and 22.50%. Intramuscular fat contentranged from 2.79 to 8.39%. The collagen content of the chuck roll, chuck tender, and short plate muscles was higher (1.97-2.04%) thanthat of the striploin muscles (1.48%) (p<0.05). CIE lightness (L*) values increased with an increase in aging days for tenderloin, loin,chuck roll, oyster blade, short plate, top sirloin, and eye of round muscles (p<0.05). Most muscles, except the short plate, showed nosignificant changes in redness CIE (a*) and yellowness (b*) color values during aging. The tenderloin, loin, and striploin showed significantly higher water holding capacity (58.60-62.06%) than that of chuck roll and short plate (53.86-57.07%) muscles (p<0.05). TheWarner-Bratzler shear force values of most muscles decreased significantly as the aging period increased (p<0.05), exception the tenderloin. The chuck tender muscles showed the highest cooking loss, whereas tenderloin muscle showed the lowest (p<0.05). The tenderloin muscle had the longest sarcomere length (SL) (3.67-3.86 ？m) and the bottom round muscle had the shortest SL (2.21-2.35 ？m)(p<0.05). In the sensory evaluation, tenderness and overall-likeness scores of most muscles increased with increase in aging days. Thetenderloin and oyster blade showed relatively higher tenderness and overall-likeness values than did the other muscles during the agingperiod. No significant differences were noted in juiciness and flavor-likeness scores among muscles and aging days.