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Effect of T-2 Toxin on Muscle Quality Characteristics and Autolysis in Litopenaeus vannamei

DENG Yijia1, WANG Yaling1,*, MO Bing2, SUN Lijun1,*, WANG Rundong1, XU Defeng1, YE Riying1, LIANG Guangming1, HE Wanying1   

  1. 1. Guangdong Provincial Key Laboratory of Aquatic Product Processing and Safety, Key Laboratory of Advanced Processing of Aquatic Products of Guangdong Higher Education Institution, College of Food Science and Technology, Guangdong Ocean University, Zhanjiang 524088, China; 2. Guangxi Zhuang Autonomous Region Testing Institute of Product Quality Supervision, Nanning 530071, China
  • Online:2017-04-15 Published:2017-04-24

Abstract: Varied doses of T-2 toxin (T-2), namely 0.0 (control), 0.5, 1.2, 2.4, 4.8, 12.2 mg/kg, were orally administered to the white shrimp Litopenaeus vannamei for 20 consecutive days. The quality characteristics and autolysis of shrimp muscle were investigated by sensory evaluation, physicochemical analysis and microscopic observation. The results indicated that T-2 exposure significantly affect the color of shrimp muscle. T-2 exposure at low dose could result in a significant increase in hardness and chewiness (P < 0.05), but a significant decrease in hardness, elasticity, cohesiveness, glueyness and chewiness at high dose (P < 0.05). The cooking loss of shrimp muscle first rose and then decrease. Microscopic examination revealed loosening and fragmentation of muscle fibers and wider gaps between muscle fibers, suggesting a decline of shrimp muscle quality. Increasing T-2 exposure resulted in a decrease in amino nitrogen content and an increase in soluble solid content. Soluble protein in shrimp muscle hydrolysate increased first and then decreased (P < 0.05). Myofibril length showed a significant decline with the increase in T-2 (P < 0.05). Electron microscopy confirmed fracture and dissolution of myofibrils, suggesting increased autolysis.

Key words: T-2 toxin, Litopenaeus vannamei, muscle, quality characteristics, autolysis

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