Affiliation:
1. School of Tourism and Cuisine Yangzhou University Yangzhou China
2. Key Laboratory of Chinese Cuisine intangible Cultural Heritage Technology Inheritance Ministry of Culture and Tourism Yangzhou China
3. Cuisine Science Key Laboratory of Sichuan Province Sichuan Tourism University Chengdu China
4. College of Food Science and Technology, National Center of Meat Quality and Safety Control Nanjing Agricultural University Nanjing China
Abstract
AbstractThis paper aimed to investigate the effects of ultrasound‐assisted L‐lysine treatment on meat quality and myofibrillar proteins (MPs) properties of pork longissimus dorsi during postmortem aging. The results revealed that the L‐lysine (Lys) and/or ultrasound treatment significantly increased (p < 0.05) the water‐holding capacity and tenderness of the pork during postmortem aging, while the ultrasound‐assisted Lys treatment had the lowest cooking loss, pressurization loss, Warner–Bratzler shear force, and hardness. In addition, L‐lysine and/or ultrasound treatment increased (p < 0.05) pH value, T21, and myofibrillar fragmentation index, while the ultrasound‐assisted Lys treatment had the highest value. Meanwhile, the protein solubility was increased with Lys and/or ultrasound treatment during postmortem aging, and ultrasound‐assisted Lys treatment had the highest solubility, reaching 88.19%, 92.98%, and 91.73% at 0, 1, and 3 days, respectively. The result of protein conformational characteristics showed that Lys and/or ultrasound treatment caused the unfolding of the α‐helix structure, resulting in the exposure of more hydrophobic amino acids and buried sulfhydryl groups, ultimately enhancing MPs solubility. In summary, ultrasound‐assisted Lys treatment altered the structure of MPs, resulting in the enhancement of the water‐holding capacity and tenderness of the pork.Practical ApplicationThis study showed that ultrasound‐assisted L‐lysine (Lys) treatment could enhance the water‐holding capacity and tenderness of pork during postmortem aging. The results might provide a reference for the application of ultrasound‐assisted Lys treatment on the improvement of pork meat quality. To facilitate practical applications in production, the development of medium and large‐sized ultrasound equipment for conducting small‐scale and pilot experiments is crucial for future research.