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Study on the electric conduction properties of fresh and frozen–thawed grass carp ( Ctenopharyngodon idellus ) and tilapia( Oreochromis niloticus )
Author(s) -
Zhang Lina,
Shen Huixing,
Luo Yongkang
Publication year - 2010
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2010.02428.x
Subject(s) - oreochromis , grass carp , tilapia , fishery , zoology , fish <actinopterygii> , biology , anatomy , veterinary medicine , medicine
Summary Electric conduction properties of fresh and frozen–thawed grass carp ( Ctenopharyngodon idellus ) and tilapia ( Oreochromis niloticus ) were studied by measuring their impedances under different frequencies. The impedances varied as frequency changed. Although impedances of both fresh and frozen–thawed fish decreased as frequency increased from 1 to 20 kHz, change ratio of impedance ( Q value) of fresh fish was evidently higher than that of frozen–thawed fish. The Q values of fresh grass carp and tilapia on the 1st, 3rd, 6th, 8th, 10th days were 60.53%, 52.24%, 35.47%, 26.86%, 21.17% and 73.13%, 52.70%, 41.06%, 39.28%, 36.31%, while frozen–thawed grass carp and tilapia were 9.65%, 11.21%, 9.58%, 8.89%, 9.13% and 18.26%, 12.80%, 13.46%, 12.16%, 12.91%, respectively. Electric conduction is a rapid, easy to use, portable and cost‐effective method for in situ analysis at practical level. Therefore, it is feasible to identify fresh and frozen–thawed fish according to the change ratio of their impedances.