CN101275939A - Testing method aiming at flash milk doped with hydrogen dioxide solution - Google Patents
Testing method aiming at flash milk doped with hydrogen dioxide solution Download PDFInfo
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- CN101275939A CN101275939A CNA2008100889852A CN200810088985A CN101275939A CN 101275939 A CN101275939 A CN 101275939A CN A2008100889852 A CNA2008100889852 A CN A2008100889852A CN 200810088985 A CN200810088985 A CN 200810088985A CN 101275939 A CN101275939 A CN 101275939A
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Abstract
The present invention relates to a detection method of original milk, especially a detection method aiming at the original milk doped with hydrogen dioxide solution. The invention belongs to the field of the food technique. An electric nose is used for establishing a model curve of the original milk doped with hydrogen dioxide solution. Further the original milk doped with hydrogen dioxide solution with same amount is used for supplying the model curve. The detection is executed to the sample of the original mile, and whether the original milk is doped with hydrogen dioxide solution can be detected by comparing the data with the standard curve when the data is obtained. The method for determining the content of hydrogen dioxide solution doped in the original milk is more quick and accurate when compared with the conventional method, and the production efficiency of the dairy enterprise can be increased. The detection limit of the hydrogen dioxide solution in the original milk can obtain 0.45mg/Kg, and is lower than the detection limit 0.5mg/Kg of the method of the national standard. Furthermore, the method is quick and accurate.
Description
Technical field
The present invention relates to a kind of detection method of former milk, especially a kind of detection method at flash milk doped with hydrogen dioxide solution.Belong to food technology field.
Background technology
Electronic Nose is the instrument that analysis, identification and the detection of complex of the novelty that grows up the nineties smelt flavor and volatile ingredient.It is different with general chemistry analytical instrument (as chromatograph, spectrometer, capillary electrophoresis apparatus) etc., that obtain is not the qualitative and quantitative result of certain or certain several composition in the sample, but the Global Information of volatile ingredient in the sample also claims " fingerprint " data.Its simulation humans and animals nose, " smelling " be the overall breath of target.It not only can measure different signals according to various smell, and these signals and the signal in the database that study is set up can be compared, discern judgement, thereby has a function of similar nose, can be used for differentiating authenticity of products, control is from the former technology of expecting whole process of production, thereby product quality is guaranteed.Electronic Nose relates to an integrated technology of sensor fusion techniques, computer technology and applied mathematics and each specific field, and wherein sensor technology and computer technology are in the forward position of current scientific and technical research and development.
External more active at present to the research of Electronic Nose, as drinks, tobacco, beverage, meat, tealeaves, mainly be the judgement of carrying out grade classification and freshness for it.But because the complicacy of dairy products matrix, the external application of Electronic Nose Technology in dairy industry is also less.At present domestic only have few scientific research institutions to carry out simple research, still do not have the sub-nose of dairy products business electrical former milk and dairy produce are studied.
In China, in recent years, because people more and more recognize the importance of cow's milk to health, cow's milk has become many people's daily necessities, market to the demand of cow's milk also in sustainable growth.Although the radix of lactogenesis total production is more than 1596.03 ten thousand tons, and annual speed with 25% continues to increase progressively, and dairy industry still is in the situation of milk source deficiency now, under the ordering about of tremendous economic interests, dairy products to ooze false phenomenon also more and more serious.
One of modal adulterant is a hydrogen peroxide in the cow's milk, and purpose is to avoid former milk long and rotten because of the resting period, plays sterilization and bacteriostasis, prolongs the former milk resting period, and the consequence of doped with hydrogen dioxide solution is to destroy the nutritional labeling of cow's milk, is detrimental to health.At present, with national standard method former milk doped with hydrogen dioxide solution content is detected, detection limit only is 0.5mg/Kg.
Summary of the invention
The purpose of invention is to obtain a kind of detected parameters, method with the former milk doped with hydrogen dioxide solution of detection by electronic nose content.
The problem to be solved in the present invention
One of modal adulterant is a hydrogen peroxide in the raw milk, and purpose is to avoid former milk long and rotten because of the resting period, plays sterilization and bacteriostasis, prolongs the former milk resting period, and the consequence of doped with hydrogen dioxide solution is to destroy the nutritional labeling of cow's milk, is detrimental to health.At present, with national standard method former milk doped with hydrogen dioxide solution content is detected, detection limit only is 0.5mg/Kg.
The present invention relates to a kind of detected parameters, method, can make the detection limit of hydrogen peroxide in the former milk reach 0.45mg/Kg, be lower than national standard method detection limit 0.5mg/Kg with the former milk doped with hydrogen dioxide solution of detection by electronic nose content, and fast, accurately.
Technical scheme
The present invention carries out data typing, modeling, judgement, detection with Electronic Nose respectively to normal former milk sample and the former milk samples of mixing different amount hydrogen peroxide, set up normal-mingle former milk (hydrogen peroxide) smell model, mix the former milk smell models of different amount hydrogen peroxide.By the foundation of model, reach and quick and precisely judge the whether purpose of doped with hydrogen dioxide solution and doped with hydrogen dioxide solution content of former milk.
Electronic Nose is the olfactory system of simulating human, and a kind of smart electronics instrument of development and design is applicable to the gas sensitization system of measuring one or more odoring substances in many systems.Its basic structure comprises following 3 parts: 1 gas sensor array, it is by having broad spectrum response characteristic, bigger cross sensitivity and gas with various being made up of the gas sensor of different sensitivity.Gas sensor can produce response and produce certain response modes the gas of contact during work.It is equivalent to the olfactory receptor cell of human nose.2 Signal Pretreatment unit, it carries out preprocessing to the response modes of sensor, to reach the purpose that drift compensation, Information Compression and reduction signal (with sample) rise and fall, finishes the task of feature extraction.3 pattern recognition unit are done further processing to the signal that the Signal Pretreatment unit is sent, and finish the identification qualitative and quantitative to gas signal.Comprise Data Management Analysis device, intelligent interpreter and knowledge base.It is equivalent to human brain.
A kind of detection method of the present invention at flash milk doped with hydrogen dioxide solution, wherein, the step of detection is as follows:
1) utilize Electronic Nose to set up the curve model of standard flash milk doped with hydrogen dioxide solution;
2) former milk sample is detected, obtain after the data with the typical curve contrast after can detect and obtain whether doped with hydrogen dioxide solution of former milk;
Wherein, the detection level of curve model point is chosen 5-12 in the described step 1), and scope is that the doped with hydrogen dioxide solution scope is the detected sample of 0-1mg/Kg.Preferred detection flash milk doped with hydrogen dioxide solution sample number is 8, the doped with hydrogen dioxide solution amount of described flash milk doped with hydrogen dioxide solution sample is that the former milk of 0mg/Kg, 0.30mg/Kg, 0.35mg/Kg, 0.40mg/Kg, 0.45mg/Kg, 0.50mg/Kg, 0.55mg/Kg, 0.60mg/Kg is built 8 modules respectively, sets up doped with hydrogen dioxide solution amount model.
Can carry out 1-6 time repeating step 1 again after the step 1) of the above) operation, set up the model of average data.
The parameter of above-mentioned detection is: sample temperature 25-55 ℃, and scavenging period 80-100s, air inflow 300-500mL/min, test sample time 20-60s.
The parametric optimization of above-mentioned detection is: 40 ℃ of sample temperatures, scavenging period 90s, air inflow 360mL/min, test sample time 40s.
Above-mentioned steps 2) after measuring former milk sample in, numerical value that obtains and curve model contrast can obtain the doped with hydrogen dioxide solution amount in the former milk sample.
The using method of Electronic Nose is as follows:
(1) open sensing switch, pre-thermal sensor makes signal reach stationary value.
(2) parameter of adjustment Electronic Nose: scavenging period 90s, air inflow 360mL/min, test sample time 40s.
(3) with water-bath sample temperature is heated to 40 ℃.
(4) with Electronic Nose the sample smell is gathered rapidly.
(5) after collection a period of time,, stop to gather when acquisition time reaches the predetermined sampling time.
(6) data of gathering are preserved, each 6 of sample mensuration is parallel.
The Electronic Nose of preferred following several models: Alpha M.O.S, pen3 AIRSENSE, ZNOSE4200, E-NOSE-1000.
Embodiment
Embodiments of the present invention are intended to explain invention; rather than restriction protection scope of the present invention; the any those of ordinary skill in this area all should be able to know clearly and understand; to specifications disclosed proportional range be can completely inerrably implement of the present invention; any difference slightly on the numerical value that causes because of the difference in milk milk source should be as the different slightly reason of testing result of the present invention; so the present invention is intended to protect the quilitative method that detects hydrogen peroxide, rather than ratio especially strictly will be limited on the some concrete numerical value.
Detected parameters, detection method with the former milk doped with hydrogen dioxide solution of detection by electronic nose content of the present invention.Detected parameters is as follows: 40 ℃ of sample temperatures, scavenging period 90s, air inflow 360mL/min, test sample time 40s; Detection method is as follows:
1. get normal former milk sample and mix different each 50mL of sample (0mg/Kg, 0.30mg/Kg, 0.35mg/Kg, 0.40mg/Kg, 0.45mg/Kg, 0.50mg/Kg, 0.55mg/Kg, 0.60mg/Kg) that measure hydrogen peroxide, it is heated to 40 ℃ with water-bath, accurately measure former milk sample 20mL, measure immediately;
With Electronic Nose measure, the data typing, each sample is made 6 parallel samples;
With normal former milk data as a module, the former milk samples that will mix different amount hydrogen peroxide are as a module, set up former milk-mingle (hydrogen peroxide) model;
4. the former milk that with the doped with hydrogen dioxide solution amount is 0mg/Kg, 0.30mg/Kg, 0.35mg/Kg, 0.40mg/Kg, 0.45mg/Kg, 0.50mg/Kg, 0.55mg/Kg, 0.60mg/Kg is built 8 modules respectively, sets up doped with hydrogen dioxide solution content model;
5. be 0.30mg/Kg, 0.35mg/Kg, 0.40mg/Kg, 0.45mg/Kg, 0.50mg/Kg, 0.55mg/Kg, the former milk checking of 0.60mg/Kg, additional model with other doped with hydrogen dioxide solution content;
6. get the former milk sample of purchasing, measure with Electronic Nose; Can contrast out in the former milk sample whether contain hydrogen peroxide, and content.
Electronic Nose records is electronic signal after sensor and the gas contact reaction, by in house software a large amount of signal datas is carried out statistical study, draws final conclusion.
Beneficial effect
Quicker than conventional method to the decision method of former milk doped with hydrogen dioxide solution content with Electronic Nose Accurately, can improve the production efficiency of Dairy Enterprise. The detection limit of hydrogen peroxide in the former milk is reached To 0.45mg/Kg, be lower than national standard method detection limit 0.5mg/Kg, and fast, accurately.
Claims (7)
1. detection method at flash milk doped with hydrogen dioxide solution, it is characterized in that: the step of detection is as follows:
1) utilize Electronic Nose to set up the curve model of standard flash milk doped with hydrogen dioxide solution;
2) former milk sample is detected, obtain after the data with the typical curve contrast after can detect and obtain whether doped with hydrogen dioxide solution of former milk;
Wherein, the detection level of curve model point is chosen 5-12 in the described step 1), and scope is that the doped with hydrogen dioxide solution scope is the detected sample of 0-1mg/Kg.
2. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 1 is characterized in that: can carry out 1-6 time repeating step 1 again after described step 1)) operation, set up the model of average data.
3. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 1 or 2 is characterized in that: the parameter of described detection is: sample temperature 25-55 ℃, and scavenging period 80-100s, air inflow 300-500mL/min, test sample time 20-60s.
4. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 3 is characterized in that: the parametric optimization of described detection is: 40 ℃ of sample temperatures, scavenging period 90s, air inflow 360mL/min, test sample time 40s.
5. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 1, it is characterized in that: preferably detecting flash milk doped with hydrogen dioxide solution sample number is 8, the doped with hydrogen dioxide solution amount of described flash milk doped with hydrogen dioxide solution sample is that the former milk of 0mg/Kg, 0.30mg/Kg, 0.35mg/Kg, 0.40mg/Kg, 0.45mg/Kg, 0.50mg/Kg, 0.55mg/Kg, 0.60mg/Kg is built 8 modules respectively, sets up doped with hydrogen dioxide solution amount model.
6. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 1 is characterized in that: preferred.
7. the detection method at flash milk doped with hydrogen dioxide solution as claimed in claim 1 is characterized in that: after measuring former milk sample described step 2), numerical value that obtains and curve model contrast can obtain the doped with hydrogen dioxide solution amount in the former milk sample.
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| CNA2008100889852A CN101275939A (en) | 2008-04-11 | 2008-04-11 | Testing method aiming at flash milk doped with hydrogen dioxide solution |
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| CNA2008100889852A CN101275939A (en) | 2008-04-11 | 2008-04-11 | Testing method aiming at flash milk doped with hydrogen dioxide solution |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636521A (en) * | 2012-04-27 | 2012-08-15 | 江南大学 | On-line odour monitoring method used in garden stuff heating-drying process |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102636521A (en) * | 2012-04-27 | 2012-08-15 | 江南大学 | On-line odour monitoring method used in garden stuff heating-drying process |
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