Method for detecting freshness of trichiurus haumela through electronic nose
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A freshness, electronic nose technology, applied in the direction of material resistance, can solve the problems of cumbersome operation, poor reliability of measurement results, easy drift of sensor baseline, etc., to achieve high detection efficiency, objective detection results, and good repeatability.
Active Publication Date: 2015-07-15
ZHEJIANG MARINE DEV RES INST
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[0005] The purpose of the present invention is to overcome the disadvantages of complicated operation, easy drift of the sensor baseline and poor reliability of the measurement results in the prior art measurement process, and provide an electronic device with easy operation, stable sensor baseline during the measurement process, and good reliability of the measurement results. Nose detection method for hairtail freshness
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Embodiment 1
[0040] Take each 5g of hairtail samples stored in a 4°C refrigerator for 0, 1, 2, 3, 4, 5, 6, 7 and 8 days as the hairtail samples to be tested, and then detect according to the following method:
[0041] (1) Preheat the gas collection bottle to 40°C, place each hairtail sample to be tested in a 125ml gas collection bottle, place 5g of silica gel desiccant around the hairtail sample to be tested, cover and seal, and vacuum to -80pa instantly , and then stand still at 20°C for 25 minutes, so that the gas of each hairtail sample to be tested diffuses into the gas collection bottle;
[0042] (2) Insert the sampling needles of the electronic nose into the gas collection bottle respectively, turn on the electronic nose and inhale the gas emitted by each hairtail sample to be tested into the air chamber of the electronic nose through the built-in pump of the electronic nose, and the gas inhalation speed is 320ml / min;
[0043] (3) Gas sensor array in the air chamber of the ele...
Embodiment 2
[0046] Take each 5g of hairtail samples stored in the refrigerator at 0°C for 0, 1, 2, 3, 4, 5, 6, 7 and 8 days as the hairtail samples to be tested, and then detect according to the following method:
[0047] (1) Preheat the gas collection bottle to 50°C, place each hairtail sample to be tested in a 150ml gas collection bottle, place 10g of silica gel desiccant around the hairtail sample to be tested, seal it with a cap, and instantly vacuum to -50pa , and then stand at 30°C for 20 minutes, so that the gas of each hairtail sample to be tested diffuses into the gas collection bottle;
[0048] (2) Insert the sampling needles of the electronic nose into the gas collection bottle respectively, turn on the electronic nose and inhale the gas emitted by each hairtail sample to be tested into the air chamber of the electronic nose through the built-in pump of the electronic nose, and the gas inhalation speed is 300ml / min;
[0049] (3) Gas sensor array in the air chamber of the...
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Abstract
The invention relates to the field of detection of freshness of fish, and in particular relates to a method for detecting the freshness of trichiurus haumela through an electronic nose, which aims at overcoming the shortcomings that the operation in measurement process is complicated, a base line of a sensor is easily drifted, and the measurement result has low reliability in the prior art. The method comprises the following steps: placing a trichiurus haumela sample to be detected into a gas collecting bottle; vacuuming the bottle; standing; absorbing gas emitted by the trichiurus haumela sample to be detected into an electronic nose chamber; detecting the gas through a gas sensor array in the electronic nose chamber; collecting the data collected by the gas sensor array; carrying out load analysis on the collected data; and determining the freshness of the trichiurus haumela sample to be detected according to the ratio of the sum C of contribution rates of a volatile oxynitride, a volatile sulfide, a volatile organic sulfide and an aroma constituent under the load analysis to the total contribution rate C0 of all the volatile constituents. The method has the advantages that the operation is simple and convenient, the base line of the sensor is stable during measuring process, and the reliability of the measurement result is high.
Description
technical field [0001] The invention relates to the field of fish freshness detection, in particular to a method for detecting hairtail freshness by using an electronic nose based on a gas sensor array. Background technique [0002] Hairtail ( Trichiurus lepturus ), also known as octopus, saury, etc., are large in size and widely distributed. They are one of the four major economic fishes in my country's marine products, especially the eastern kelp with the highest output. Hairtail has delicate meat, fresh and tender taste, unique nutritional value, easy digestion and absorption, and is very popular among domestic and foreign consumers. [0003] Freshness is an important indicator of aquatic product quality and quality safety evaluation. Common evaluation methods include sensory evaluation, microbial detection, physical and chemical methods, etc. Among them, volatile base nitrogen (TVBN) is a product in the process of meat spoilage, and its content reflects the degree of s...
Claims
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