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<p>The present study investigated the effects of ultrasound-assisted L-lysine (Lys) in regulating mitochondrial function to enhance the color stability of porcine <i>longissimus dorsi</i>. The results indicated that the meat treated with ultrasound-assisted Lys showed higher <i>L</i>* and <i>a</i>* values, and lower <i>b</i>* and <i>H</i>* values. Simultaneously, the myoglobin (Fe<sup>2+</sup>) content significantly increased (<i>p</i> &lt; 0.05), while the levels of metmyoglobin (MetMb) and reactive oxygen species (ROS) decreased. Additionally, mitochondrial structure remained intact, membrane permeability decreased, and the ability of the mitochondrial electron transport chain (ETC) to reduce MetMb significantly enhanced (<i>p</i> &lt; 0.05). The levels of NADH (nicotinamide adenine dinucleotide reduced) and MetMb reductase increased to 2.67&#xa0;nmol/g and 168.79&#xa0;ng/L, respectively, and the NADH-dependent reduction capacity of MetMb also significantly improved. In summary, the ultrasound-assisted Lys treatment decreased the ROS levels, protecting the integrity of the mitochondrial membrane and enhancing the ability of the mitochondrial ETC and NADH to reduce MetMb, thereby improving meat color stability.</p> Graphical abstract <p></p>

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Ultrasound-assisted L-lysine improves color stability of porcine Longissimus Dorsi by regulating mitochondrial functional characteristics

  • 期刊论文

  • 发表日期：

    2025年6月30日

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  • Xiuyun Guo,
  • Shuangyi Xu,
  • Chao Fu,
  • Jinsheng Yang,
  • Xiangren Meng

摘要

The present study investigated the effects of ultrasound-assisted L-lysine (Lys) in regulating mitochondrial function to enhance the color stability of porcine longissimus dorsi. The results indicated that the meat treated with ultrasound-assisted Lys showed higher L* and a* values, and lower b* and H* values. Simultaneously, the myoglobin (Fe2+) content significantly increased (p < 0.05), while the levels of metmyoglobin (MetMb) and reactive oxygen species (ROS) decreased. Additionally, mitochondrial structure remained intact, membrane permeability decreased, and the ability of the mitochondrial electron transport chain (ETC) to reduce MetMb significantly enhanced (p < 0.05). The levels of NADH (nicotinamide adenine dinucleotide reduced) and MetMb reductase increased to 2.67 nmol/g and 168.79 ng/L, respectively, and the NADH-dependent reduction capacity of MetMb also significantly improved. In summary, the ultrasound-assisted Lys treatment decreased the ROS levels, protecting the integrity of the mitochondrial membrane and enhancing the ability of the mitochondrial ETC and NADH to reduce MetMb, thereby improving meat color stability.

Graphical abstract