张丽娜¹ , 沈慧星², 张连娣²，罗永康¹
（1 中国农业大学食品科学与营养工程学院，北京 100083；2 中国农业大学理学院，北京 100083）

摘要：运用物理方法-伏安法测定不同频率下冰鲜和解冻团头鲂的阻抗，分析在不同贮藏条件下团头鲂阻抗的相对变化Q值的变化特点。结果表明：从1 kHz增大到20 kHz，冰鲜和解冻团头鲂的阻抗均随着频率的增大而减小，冰鲜团头鲂的阻抗相对变化Q值明显大于解冻团头鲂。冰鲜团头鲂的阻抗相对变化Q值在第1、3、6、8、10天分别为81.09%、46.35%、29.29%、34.59%、20.43%，而冷冻30 d后解冻团头鲂的Q值分别为16.19%、14.59%、10.3%、16.27%、10.10%。前6天冰鲜团头鲂的Q值下降幅度较大，之后Q值变化不明显，冷冻30 d后解冻团头鲂的Q值随解冻后贮藏时间的延长，无明显变化。以Q值20%为界限，快速鉴定冰鲜团头鲂和解冻团头鲂是可行的。

关键词：冰鲜团头鲂；解冻团头鲂；阻抗；阻抗相对变化值

Electrical properties of fresh and frozen-thawed bluntsnout bream during storage

ZHANG li-na ¹, SHEN hui-xing², ZHANG lian-dⁱ², LUO yong-kang¹

( 1 College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 10083, China;
2 College of Science, China Agricultural University, Beijing 10083, China )

Abstract: The study adopted voltmeter-ammeter method to measure the impedance of fresh and frozen-thawed bluntsnout bream under different frequencies during storage. Although impedances of both fresh and frozen-thawed bluntsnout bream decreased as frequencies increasing from 1 kHz to 20 kHz, change ratio of impedance (Q value) of fresh samples was evidently higher than that of frozen-thawed ones. The Q value of fresh and frozen-thawed bluntsnout bream in the day of 1, 3, 6, 8, 10 were 81.09%, 46.35%, 29.29%, 34.59%, 20.43% and 16.19%, 14.59%, 10.3%, 16.27%, 10.10%, respectively. The Q value of fresh bluntsnout bream decreased greatly in the fist 6 days and became gentleness during the rest storage days. The Q value of thawing bluntsnout bream was not significant changes with the storage time increasing. It is feasible to identify unfrozen and frozen-thawed bluntsnout bream according to the change ratio of their impedance compared with 20%.

Key words: fresh bluntsnout bream; frozen-thawed bluntsnout bream; impedance; impedance change ratio (Q value)

基金项目：现代农业产业技术体系建设专项资金资助（nycytx-49-24）

作者简介：张丽娜（1986—），女，研究生，研究方向：农产品加工及贮藏工程。E-mail: zhanglina081986@163.com

通讯作者：罗永康（1964—），男，教授/博导，博士，主要从事水产品加工研究。E-mail: luoyongkang@263.net

（来源：《渔业现代化》2009，36（6）：39-41）