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首页> 外文期刊>Food Chemistry >Muscle structure responses and lysosomal cathepsins B and L in farmed Atlantic salmon (Salmo salar L.) pre- and post-rigor fillets exposed to short and long-term crowding stress
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Muscle structure responses and lysosomal cathepsins B and L in farmed Atlantic salmon (Salmo salar L.) pre- and post-rigor fillets exposed to short and long-term crowding stress

机译：暴露于短期和长期拥挤压力下的大西洋鲑（Salmo salar L.）戒备前后的鱼片的肌肉结构响应和溶酶体组织蛋白酶B和L

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摘要

Atlantic salmon (average body weight 2.9 ±0.1 kg) were subjected to either minimal pre-slaughter crowding stress (NS group), 20 min (short-term stress, SS group) or about 24 h pre-slaughter crowding stress (long-term stress, LS group). Significant negative effects were mostly seen due to long-term stress (LS) at early stages post-mortem, but also short-term stress (SS) had significant negative impacts on muscle quality of pre- and post-rigor fillets. Pre-slaughter long-term stress (LS) significantly lowered muscle pH, softened the fillets and increased muscle cathepsin L gene expression, immediately post-mortem. A tendency of increased cathepsin B gene expression and cathepsin B total activity was also seen. Stress further accelerated the incidence of myofibre-myofibre detachments, increased the percentage of myofibre-myocommata detachments over the storage period and increased the percentage of myofibre breakages and contracted myofibres 96 h post-mortem. Significant correlations were observed between muscle pH and cathepsin B + L activity, muscle texture and muscle degradation parameters. Cathepsin B activity was correlated to muscle degradation and cathepsin L gene expression to muscle degradation and texture. Pre-slaughter stress, especially long-term stress (LS), thus seems to accelerate cathepsin activity, resulting in faster muscle degradation, directly or indirectly connected to the low initial muscle pH. No significant variation was observed between pre-rigor and post-rigor filleting, except that pre-rigor filleting significantly increased the percentage of myofibre breakages.
机译：大西洋鲑鱼（平均体重2.9±0.1千克）受到最小的屠宰前拥挤压力（NS组），20分钟（短期压力，SS组）或约24小时的屠宰前拥挤压力（长期压力，LS组）。显着的负面影响主要是由于死后早期的长期压力（LS）引起的，但短期压力（SS）对严格的鱼片前后的肌肉质量也具有明显的负面影响。宰前立即长期宰杀（LS）可显着降低肌肉pH，软化鱼片并增加肌肉组织蛋白酶L基因的表达。还观察到组织蛋白酶B基因表达和组织蛋白酶B总活性增加的趋势。应激进一步加速了肌纤维-肌纤维分离的发生率，增加了在储存期间肌纤维-肌瘤分离的百分比，并增加了死后96小时肌纤维断裂和收缩的肌纤维的百分比。观察到肌肉pH值与组织蛋白酶B + L活性，肌肉质地和肌肉降解参数之间的显着相关性。组织蛋白酶B活性与肌肉降解相关，而组织蛋白酶L基因表达与肌肉降解和质地相关。屠宰前的压力，尤其是长期压力（LS），似乎加快了组织蛋白酶的活性，导致肌肉降解更快，直接或间接与较低的初始肌肉pH值相关。手术前和手术后的倒角之间没有观察到明显的变化，除了手术前的倒角显着增加了肌纤维断裂的百分比。

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  • 来源
    《Food Chemistry》 |2010年第3期|602-615|共14页
  • 作者

    D. Bahuaud; T. Morkore; T.-K. Ostbye; E. Veiseth-Kent; M.S. Thomassen; R. Ofstad;

  • 作者单位

    Norwegian University of Life Sciences (UMB), Department of Animal and Aquacultural Sciences (IHA), Postbox 5003, 1432 As, Norway;

    Norwegian University of Life Sciences (UMB), Department of Animal and Aquacultural Sciences (IHA), Postbox 5003, 1432 As, Norway Nofima Marin AS, Postbox 5000, 1432 As, Norway;

    Nofima Marin AS, Postbox 5000, 1432 As, Norway;

    Nofima Mat AS, Osloveien 1, 1430 As, Norway;

    Norwegian University of Life Sciences (UMB), Department of Animal and Aquacultural Sciences (IHA), Postbox 5003, 1432 As, Norway;

    Nofima Mat AS, Osloveien 1, 1430 As, Norway;

  • 收录信息 美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    fish quality; stress; pH; texture; protease; muscle degradation; myofibre; myocommata; breakages;

    机译：鱼类质量;强调;pH值质地;蛋白酶肌肉退化;肌纤维肌瘤破损;

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