A judgment on postmortem aging in longissimus dorsi based on a peptide substrate library.
We attempted to develop a method to determine easily and effectively the degree of postmortem aging of pork longissimus dorsi (LD) by measuring the activity of proteases in the LD using fluorogenic peptide substrates. LD was used to measure the change with time in the protease activity detected with these substrates. Determining the variations within the LD muscles, strong positive correlations were found between changes in hardness and fluorescence intensities against Ac-Ala-MCA, Ac-Met-MCA, Ac-Ser-MCA, Ac-Thr-MCA, and Ac-Ala-Phe-MCA (P<0.005), and strong negative correlations were found between changes in total amounts of free amino acids and Ac-Ala-MCA, Ac-Met-MCA, Ac-Ser-MCA, Ac-Thr-MCA, and Ac-Ala-Phe-MCA (P<0.001). Negative correlations were also observed between changes in the amounts of free Ala, Arg, Lys, Leu, Met, Phe, and Tyr and the fluorescence intensities against Ala, Arg, Lys, Leu, Met, Phe, and Tyr-MCA respectively (P<0.001).
Onitsuka
Eiichiro
E
Research and Development Center, Nippon Meat Packers, Inc., Tsukuba, Ibaraki. eonitsuka@nipponham.co.jp
Okumura
Tomoyuki
T
Murakami
Hiroshi
H
Nishino
Norikazu
N
Morimatsu
Fumiki
F
D000596:Amino Acids / Q000032:analysis; D000818:Animals; D018482:Muscle, Skeletal / Q000502:physiology; D019151:Peptide Library; D011180:Postmortem Changes; D013552:Swine
D000596:Amino Acids; D019151:Peptide Library