CN1230677C - Fast discrimination method for iced fish and unfrozen fish - Google Patents
Fast discrimination method for iced fish and unfrozen fish Download PDFInfo
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- CN1230677C CN1230677C CN 200410000696 CN200410000696A CN1230677C CN 1230677 C CN1230677 C CN 1230677C CN 200410000696 CN200410000696 CN 200410000696 CN 200410000696 A CN200410000696 A CN 200410000696A CN 1230677 C CN1230677 C CN 1230677C
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Abstract
The present invention discloses a fast discrimination method for iced fresh fish and unfrozen fish, which belongs to the technical field of food discrimination. The present invention is based on the principle that the freeze preservation of fish meat causes the concentration change of intracellular fluid and extracellular fluid of muscle fibril, the transfer of intracellular and extracellular water, the change of cell shape, and the great difference of the conducting characteristic of a muscle medium. Under the conditions of 1000Hz to 16000Hz of frequency and 3 to 9 volts of voltage, an impedance measuring instrument is used for detecting the great difference of the conducting characteristic between the iced fresh fish and the unfrozen fish, namely that the Q-value of the unfrozen fish is lower than 10% and the Q-value of the iced fresh fish is higher than 20%. The iced fresh fish and the unfrozen fish are fast detected in two minutes without damage to the fish, identification without damage can be realized, the accuracy rate of the identification can reach more than 95%, and detection cost is low.
Description
Technical field
The invention belongs to food authentication technique scope, particularly a kind of discrimination method of icing fresh fish reconciliation frozen fish.
Background technology
After the ice fresh fish is meant that fish catches, be deposited in below 4 ℃, and without frappe fish, the preservation time had only in 10 days usually always.Separate frozen fish refer to fish catch after through chilled storage (below 20 ℃), and then through the fish of thawing, fish can preserve 6～12 months when chilled storage, had very long storage period.From flesh of fish matter mouthfeel, ice fresh fish delicious meat is better than the fish of thawing.From the outward appearance of fish, the ice fresh fish is conciliate frozen fish and is difficult to be distinguished by naked eyes.Because it is freezing that the ice fresh fish does not pass through, the shelf-life is short, delicious meat, and its price will be apparently higher than the similar frozen fish of separating.At present, some enterprises will separate frozen fish usually and sell as the ice fresh fish in order to pursue high profit, damage consumer's interests so to a certain extent.
About the detection technique after icing aquatic foods and thawing, though carried out certain research work by the scholar both at home and abroad, having proposed certain methods such as Vincenzo has reported in document " 1985; J.Sci.Food Agric " by being distinguished icing the method that bright and frozen fish protein carries out electrophoresis, but this method is very complicated, is unwell in the actual detected and uses.There is bigger difference .Hamm report in " 1982; 28th Europe Meet ResearchWorkers Congress " in Barbagli proposes some enzyme in the ice aquatic foods and the trout that thaws in document " 1981; J.Food Sci " activity, utilize the activity of beta-hydroxy coacetylase deoxygenase (HADH) in the bright reconciliation of the ice frozen meat different, can conciliate frozen meat to cooling meat and be distinguished." 1993, it is bright and separate frozen spiny lobster more also to propose to distinguish ice by the activity of beta-hydroxy coacetylase deoxygenase among the FoodChemistry ' at document for Hoz.But technology is all complicated, spend the long time to carry out a series of chemical detection, and the expense height of detection, the time is long, and accuracy is not high.
Summary of the invention
The purpose of this invention is to provide a kind of discrimination method that fresh fish is conciliate frozen fish of icing, the discrimination method that described ice fresh fish is conciliate frozen fish is a physical method.It is characterized in that: this method is to conciliate frozen fish under equal conditions according to ice is bright, the impedance variation difference, and the quick nondestructive that carries out detects.The rate of change detection principle that the ice fresh fish is conciliate its impedance of frozen fish is
Annotate: X
LImpedance during for low frequency, X
HImpedance during for high frequency, Q is an impedance rate of change; Warp is in 1000Hz～16 000Hz frequencies, and voltage is under 3～9 laid shoot spares, and the bright conductive characteristic of conciliating frozen fish of ice that detects with impedance measuring Instrument has bigger difference, promptly separates frozen fish Q value＜15%, ice fresh fish Q value＞20%.
The invention has the beneficial effects as follows and utilize the flesh of fish in the cold storage process, cause the change of muscle fibril intracellular fluid and outer liquid concentration, the transfer of free surface moisture in the cell, the change of cellular morphology, thereby the conductive characteristic that causes its muscle medium has the principle than big-difference to detect, and this method can detect the bright impedance rate of change of conciliating frozen fish of ice in quick nondestructive ground in 2 minutes.Promptly in 2 minutes, realize undamaged discriminating, more than the rate of accuracy reached to 95% of discriminating.Testing cost is low, except that instrument takes, and each other expense that do not need substantially that detects.
Embodiment
The invention provides a kind of discrimination method that fresh fish is conciliate frozen fish of icing, is physical method.This method is to conciliate frozen fish under equal conditions according to ice is bright, the impedance variation difference, and the quick nondestructive that carries out detects.The rate of change detection principle that the ice fresh fish is conciliate its impedance of frozen fish is
Annotate: X
LImpedance during for low frequency, X
HImpedance during for high frequency, Q is an impedance rate of change; Warp is in 1000Hz～16 000Hz frequencies, and voltage is under 3～9 laid shoot spares, and the bright conductive characteristic of conciliating frozen fish of ice that detects with impedance measuring Instrument has bigger difference, promptly separates frozen fish Q value＜15%, ice fresh fish Q value＞20%.Above-mentioned detection principle is to utilize the flesh of fish in the cold storage process, because its moisture forms ice crystal, causes the change of muscle fibril intracellular fluid and outer liquid concentration.The transfer of free surface moisture in the cell, the change of cellular morphology, the conductive characteristic that causes its muscle medium has the principle than big-difference.
The present invention is consulting a large amount of conductive characteristics about biology, in iced storage and the cold storage process, the variation data of structure of fish muscle architectural characteristic has been carried out more than 20 kind of marine fish, fresh-water fishes under different frequencies, carries out the mensuration of conductive characteristic, relevant data is analyzed to sum up draw.Object lesson is as follows:
Example 1: will ice crucian bright and that thaw and under 9 volts voltage, feed 1 000 and the alternating current of 16000Hz frequency respectively, and measure its impedance, then bright crucian in 5 days, its Q value＞30%, and its Q value＜10% of the crucian after thawing preserved of ice.Like this can very fast difference ice aquatic foods and the crucian of thawing.
Example 2: will ice yellow croaker bright and that thaw and under 9 volts voltage, feed 1000 and the alternating current of 16000Hz frequency respectively, and measure its impedance, then bright yellow croaker in 5 days, its Q value＞20%, and its Q value＜8% of the yellow croaker after thawing preserved of ice.Like this can very fast difference ice aquatic foods and the yellow croaker of thawing.
See that according to the bright conductive characteristic of conciliating frozen fish of the relevant ice of measuring repeatedly quick nondestructive ground detects the bright reconciliation of ice frozen fish in 2 minutes, realizes undamaged discriminating, more than the rate of accuracy reached to 95% of discriminating.
Claims (1)
1. ice the discrimination method that fresh fish is conciliate frozen fish for one kind, the discrimination method that described ice fresh fish is conciliate frozen fish is a physical method; It is characterized in that: this method is to conciliate frozen fish under equal conditions according to ice is bright, the impedance variation difference, and the not damaged that carries out detects, and the rate of change of its impedance detects principle and is
Annotate: X
LImpedance during for low frequency, X
HImpedance during for high frequency, Q is an impedance rate of change; Warp is in 1000Hz～16000Hz frequency, and voltage is under 3～9 laid shoot spares, and the bright conductive characteristic of conciliating frozen fish of ice that detects with impedance measuring Instrument has bigger difference, promptly separates frozen fish Q value＜10%, ice fresh fish Q value＞20%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000696 CN1230677C (en) | 2004-01-16 | 2004-01-16 | Fast discrimination method for iced fish and unfrozen fish |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200410000696 CN1230677C (en) | 2004-01-16 | 2004-01-16 | Fast discrimination method for iced fish and unfrozen fish |
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| CN1558219A CN1558219A (en) | 2004-12-29 |
| CN1230677C true CN1230677C (en) | 2005-12-07 |
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| CN 200410000696 Expired - Fee Related CN1230677C (en) | 2004-01-16 | 2004-01-16 | Fast discrimination method for iced fish and unfrozen fish |
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Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101825594B (en) * | 2010-05-18 | 2012-07-25 | 中国农业大学 | Method for quick nondestructive detection of freshness of freshwater fish |
| CN101949876B (en) * | 2010-08-18 | 2013-01-09 | 中国农业大学 | Method for identifying unfrozen meat and fresh meat based on impedance spectrum |
| CN103760193B (en) * | 2014-02-13 | 2015-07-01 | 南京农业大学 | Method for quickly identifying freezing-thawing frequency of poultry meat |
| CN108982636A (en) * | 2018-07-26 | 2018-12-11 | 江苏大学 | Quickly identify the method for cold fresh beef reconciliation chilled beef based on electrochemistry phase spectrum |
| CN111562359A (en) * | 2020-04-10 | 2020-08-21 | 中国农业大学 | Automatic detector and detection method for rapidly and nondestructively detecting fish body storage mode |
| CN111999345A (en) * | 2020-08-27 | 2020-11-27 | 大连工业大学 | Method for detecting freshness of fishes based on conductivity |
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