武昌鱼宰后4 ℃冷藏条件下品质变化规律.doc

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1、武昌鱼宰后4 冷藏条件下品质变化规律摘 要:通过对武昌鱼宰后4 冷藏条件下72 h内僵直指数、质构、pH值、持水力、白度、5-三磷酸腺苷(5-adenosine triphosphate,ATP)及其关联物含量的测定和分析,探究武昌鱼的品质变化规律。结果表明:武昌鱼宰后6 h的硬度、僵直指数明显高于其他时间点,之后开始下降;武昌鱼宰后pH值迅速下降,宰后6 h时降低至6.580.04,随后逐渐上升;武昌鱼的持水力先下降再升高;白度在宰后72 h时降低至38.020.23;宰后2 h时ATP含量最高,5-一磷酸腺苷(5-adenosine monophosphate,AMP)含量与ATP变化趋势

2、相似,AMP在AMP脱氨酶的作用下降解产生5-肌苷酸(5-inosine monophosphate,IMP),宰后04 h内IMP含量上升,IMP经磷酸酶转化为肌苷和次黄嘌呤(hypoxanthine,Hx),从宰后36 h起Hx含量增加速率明显增大;宰后24 h内,K值保持在20%以内的一级鲜度范围,宰后2472 h仍然保持在20%40%的二级鲜度范围。 关键词:武昌鱼;冷藏;鲜度;品质 Quality Changes of Megalobrama amblycephalala during Postmortem Storage at 4 DONG Yiqun, NIU Sumin, LU

3、O Xin, XIE Dingyuan* (College of Food Science and Technology, Huazhong Agricultural University, Wuhan 430000, China) Abstract: The quality changes of Megalobrama amblycephalala were evaluated in terms of stiffness index, texture, pH, water-holding capacity, whiteness, and the contents of 5-adenosine

4、 triphosphate (ATP) and related compounds during 72 h of postmortem storage at 4 . At 6 h after slaughter, the hardness and stiffness index reached their peak, and then fell. The pH decreased rapidly after slaughter, decreasing to 6.58 0.04 at 6 h, and then rose gradually. The water-holding capacity

5、 decreased firstly and then increased. The whiteness first rose and then fell to 38.02 0.23 at 72 h. The ATP content was the highest at 2 h, and its trend was similar to that of 5-adenosine monophosphate (AMP). The content of 5-inosine monophosphate (IMP), produced from AMP degradation catalyzed by

6、AMP deaminase, increased from 0 to 4 h. The content of hypoxanthine (Hx) increased significantly faster from 36 h onward. The K value was kept below 20% (the first freshness grade) up to 24 h after slaughter and remained within the range of 20%C40% (the second freshness grade) from 24 to 72 h. Keywo

7、rds: Megalobrama amblycephalala; cold storage; freshness; quality DOI:10.7506/rlyj1001-8123-20211214-238 中D分类号:S984.11 文献标志码:A 文章编号:1001-8123(2022)03-0032-06 引文格式: 董轶群, 牛素敏, 罗鑫, 等. 武昌鱼宰后4 冷藏条件下品质变化规律J. 肉类研究, 2022, 36(3): 32-37. DOI:10.7506/rlyj1001-8123-20211214-238. http:/ DONG Yiqun, NIU Sumin, LUO Xin, et al. Quality changes of Megalobrama amblycephalala during postmortem storage at 4 J. Meat Research, 2022, 36(3): 32-37. DOI:10.7506/rlyj1001-8123-20211214-238. http:/ 第 3 页 共 3 页

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