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Warner-Bratzler Shear Force, Sarcomere Length, Total Collagen Contents and Sensory Characteristics of Hanwoo Beef (Korean Native Cattle) Quality Grade

한우육의 육질등급에 따른 부위별 전단력, 근절길이, 콜라겐의 함량 및 관능 특성

  • Lee, Yeon-Jung (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Kim, Cheon-Jei (Department of Food Science and Biotechnology of Animal, Konkuk University) ;
  • Park, Beom-Young (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Seong, Pil-Nam (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Kim, Jin-Hyong (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Kang, Guen-Ho (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Kim, Dong-Hun (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science) ;
  • Cho, Soo-Hyun (Quality Control and Utilization of Animal Products Division, National Institute of Animal Science)
  • 이연정 (농촌진흥청 국립축산과학원) ;
  • 김천제 (건국대학교 축산식품생물공학과) ;
  • 박범영 (농촌진흥청 국립축산과학원) ;
  • 성필남 (농촌진흥청 국립축산과학원) ;
  • 김진형 (농촌진흥청 국립축산과학원) ;
  • 강근호 (농촌진흥청 국립축산과학원) ;
  • 김동훈 (농촌진흥청 국립축산과학원) ;
  • 조수현 (농촌진흥청 국립축산과학원)
  • Published : 2009.12.31

Abstract

This study was conducted to investigate the Warner-Bratzler shear force (WBS), sarcomere length, total collagen contents and consumer tests of different cuts of Hanwoo beef based on quality grade. Five cuts [Cheggt (striploin), Dngsim (loin), Moksim (chuck roll), Udoon (top round), Yanggi (brisket)] were obtained from Hanwoo beef (bulls and steers, 24-30 months old) and grouped by their quality grades ($1^{++}$, $1^+$, 1, 2 and 3). The WBS values of chuck cut in $1^{++}$, $1^+$ and 1 quality grade groups were 5.47 (kg/0.5 $inch^2$), 5.46 (kg/0.5 $inch^2$) and 6.54 (kg/0.5 $inch^2$), respectively, which were significantly lower than those of chuck in quality grade 3, which was 8.41 (kg/0.5 $inch^2$) (p<0.05). The sarcomere length of the quality grade groups were significantly longer for brisket (3.72 ${\mu}m$) of $1^{++}$ quality grade than for that of 3 quality grade brisket (p<0.05). Brisket of $1^{++}$ and 2 quality grade had significantly greater sarcomere lengths than strip loin and top round in the same quality grade (p<0.05). The total collagen contents of strip loins in the $1^{++}$, $1^+$, and 1 quality grade groups (1.17, 1.18 and 1.14 g/100 g, respectively) were significantly lower than those of the 3 quality grade group (1.63 g/100 g) (p<0.05). The overall sensory scores of tenderness and juiciness for the five cuts of $1^{++}$ quality grade were significantly higher than those of the other quality grade (p<0.05). Among the five cuts, loin had the highest tenderness and juiciness scores (p<0.05), whereas top round had the lowest tenderness and juiciness scores (p<0.05). Overall, there were significant differences in the WBS and sensory properties among quality grades and cuts (p<0.05). However, the sarcomere length and total collagen contents of chuck roll, top round and loin did not differ among quality grades.

본 연구는 국립축산과학원 한우시험장에서 사육된 한우 육질등급($1^{++}$, $1^+$, 1, 2, 3)과 5부위(chuck, strip loin, top round, brisket, loin) 간에 따른 전단력, 근절길이와 콜라겐 함량을 조사하고자 실시하였으며, 수소 및 거세우(24-30개월) 총 15두(5등급$\times$3두)를 공시 축으로 이용하였다. 전단력은 $1^{++}$, $1^+$, 1등급에서 목심은 각각 5.47 kg/0.5 $inch^2$, 5.46 kg/0.5 $inch^2$, 6.54 kg/0.5 $inch^2$로 3등급 목심(8.41 kg/0.5 $inch^2$)보다 유의적으로 낮았다(p<0.05). $1^{++}$, $1^+$, 1등급에서 양지는 등심 및 채끝부위보다 유의적으로 가장 높았으며(p<0.05) $1^+$등급에서 양지(3.24 kg/0.5 $inch^2$)는 등심(1.00 kg/0.5 $inch^2$)과 채끝(1.13 kg/0.5 $inch^2$)보다 전단력수치가 유의적으로 높게 나타났다. 또한 육질등급 간에 근절길이는 $1^{++}$등급 양지부위가 3.72um으로 유의적으로 가장 길었고 3등급에서는 1.62로 가장 짧았다. $1^{++}$등급과 2등급에서 양지부위의 근절길이가 채끝 및 우둔부위보다 유의적으로 길게 나타났다(p<0.05). 총 콜라겐함량은 $1^{++}$, $1^+$, 1등급에서 채끝부위가 각각 1.17, 1.18, 1.14로 유의적으로 낮았던 반면 3등급 채끝부위가 1.63으로 유의적으로 가장 높았다(p<0.05). 또한 3등급에서는 양지부위가 3.22로 등심 및 채끝, 목심, 우둔부위보다 콜라겐의 함량이 유의적으로 가장 높았다(p<0.05). 또한 한우고기를 육질등급에 따라 5부위를 탕, 구이와 스테이크의 3가지로 관능적인 특성을 조사한 결과 요리형태 탕, 구이와 스테이크의 관능평가에서 $1^{++}$등급이 다른 등급과 비교하였을 때 연도와 다즙성이 유의적으로 가장 높았던 반면에 3등급 한우고기는 연도와 다즙성이 유의적으로 낮은 것으로 평가되었다(p<0.05). 부위에 따라서는 등심부위가 탕, 구이와 스테이크의 관능평가에서 연도와 다즙성이 유의적으로 가장 높았으며 우둔부위가 유의적으로 가장 낮게 나타났다(p<0.05). 따라서 본 연구결과 한우고기는 전단력 및 관능 특성이 5부위 모두 육질등급 및 부위에 따라 유의적인 차이가 있는 것으로 나타났다(p<0.05). 한편 근절길이 및 콜라겐 함량은 부위에 따라 차이는 있었으나 목심, 우둔 및 등심부위의 경우 육질등급에 따른 유의적인 차이가 없는 것으로 나타났다.

Keywords

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