CN104749150A - Edible oil quality fast identification method and identification device based on three-dimensional fluorescence spectrum - Google Patents
Edible oil quality fast identification method and identification device based on three-dimensional fluorescence spectrum Download PDFInfo
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- CN104749150A CN104749150A CN201510150927.8A CN201510150927A CN104749150A CN 104749150 A CN104749150 A CN 104749150A CN 201510150927 A CN201510150927 A CN 201510150927A CN 104749150 A CN104749150 A CN 104749150A
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Abstract
The invention discloses an edible oil quality fast identification method and identification device based on the three-dimensional fluorescence spectrum. The identification device comprises a computer with a pre-stored edible oil database, a data acquiring card, a CCD image sensor, a cuvette, a monochrometer, a focusing lens, a control circuit and a xenon lamp, the structure is simple and the connection is convenient; and a light signal emitted by the xenon lamp is divided into monochromatic light through the monochrometer, and then the monochromatic light is emitted to the cuvette with a to-be-tested oil sample to motivate the to-be-tested oil sample to emit the fluorescence, the fluorescence is received by the CCD image sensor after being collected by the focusing lens, and then the data acquiring card is used for composing the obtained fluorescence spectrum as a matrix array to be transmitted to the computer, the computer is used for contrastively analyzing the data and the edible oil database to obtain a result. The identification method is simple, the identification speed is fast, the identification accuracy is high, and the specificity is strong.
Description
Technical field
The present invention relates to edible oil quality authentication technique field, especially based on edible oil quality method for quick identification and the identification device of three-dimensional fluorescence spectrum.
Background technology
The quality of edible oil quality is directly connected to the security status of food of country, but " waste oil " " roast duck oil " etc. reflux repeatedly, edible oil pretended to be by dining table, to the dietetic hygiene of the people and healthyly bring high risks.Waste oil is after peroxidating, adsorption treatment, and color with oil color obviously shoals, and viscosity reduces, and penetrating odor disappears.Therefore waste oil can not be detected easily by means of only organoleptic detection color and luster, transparency etc.
In addition, mix pseudo-phenomenon and be on the rise in the edible oil and fat of outlet and home market in recent years.Price variance is very large because its kind is different, nutritive value is different for vegetable oil.Some operators, in order to obtain sudden huge profits, mix cheap vegetable oil in high price vegetable oil.As mixed oil with common edible in olive oil, in sesame oil, mix rape oil, cottonseed oil, soybean oil, sunflower oil; Palm oil, cottonseed wet goods is mixed in rape oil.Also there is illegal manufacturer to mix in edible oil by the Toxic that country forbids, make expired rotten oil product reach some Physico-chemical tests index of qualified edible oil, get by under false pretences.
For above-mentioned situation, the Ministry of Public Health is repeatedly to Social collecting edible oil method for quick, several detection methods of arriving of current collection due to specificity not strong, cannot tell which is edible oil, which is the edible oil being doped with variable concentrations waste oil completely, and traditional chemical detection method can not be made to the edible oil of doping and judging fast and effectively.At present conventional spectral method of detection is few due to information content, just detects for above-mentioned a certain situation, can not react the quality condition of edible oil comprehensively, thus in the urgent need to study a kind of can the novel detection method of Rapid identification edible oil quality.Fluorescence spectrum analysing method have quick, efficient, pollution-free, without the need to features such as pre-treatments, in recent years at food, environment measuring field obtains fast development.But, because vegetable edible oil principal ingredient is all triglyceride, all the other complicated components.Contained by different edible oil kinds, nutritional labeling is roughly the same, but content is different; Because job sequence is different, one species oil product also can produce some component differences.Conventional fluorescence spectrum analysing method is when processing the Overlapping of fluorescence spectra of multicomponent sample, and its selectivity, sensitivity are challenged, therefore in the urgent need to studying a kind of novel detection method providing more detected material information.
Summary of the invention
Technical matters to be solved by this invention is the present situation for prior art, provides discrimination method simple, differentiates that speed is fast, discriminating accuracy rate is high, the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum of high specificity, its identification device structure is simple, easy to connect.
The present invention solves the problems of the technologies described above adopted technical scheme:
Based on the edible oil quality method for quick identification of three-dimensional fluorescence spectrum, comprise the following steps:
Step one, oil sample to be measured is put into cuvette;
Step 2, open xenon lamp, xenon lamp sends light signal and is divided into monochromatic light through monochromator, and monochromatic light is beaten and put into cuvette putting into oil sample to be measured, excites oil sample emitting fluorescence to be measured;
Step 3, collect emitting fluorescence by condenser lens, then deliver to ccd image sensor and received by it;
Step 4, excite the fluorescence spectrum obtained to form matrix array different excitation wavelength by data collecting card, and these matrix array data are delivered to computing machine;
The data of acquisition and the normal data in the edible oil database pre-deposited contrast by step 5, computing machine, analyze the kind and the quality that draw oil sample to be measured.
Above-mentioned condenser lens is vertical with emitting fluorescence to be arranged.
For an identification device for the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum, comprise the computing machine, data collecting card, ccd image sensor, cuvette, monochromator, condenser lens, control circuit and the xenon lamp that pre-deposit edible oil database; Described computing machine is connected with control circuit signal, this control circuit respectively with xenon lamp, monochromator, data collecting card and ccd image sensor control linkage, described data collecting card is connected with data transfer of computer, described xenon lamp is connected with cuvette light signal through monochromator, and described cuvette line focus lens are connected with ccd image sensor light signal.
Above-mentioned monochromator includes housing, is arranged at the light import on described housing and light exit, is just tiltedly installed with reflective mirror to light inflow point in described housing, is also provided with the first concave mirror, the second concave mirror and grating in described housing.
Above-mentioned grating comprises the first grating and the second grating, and the first described grating and the second parallel gratings are arranged.
The present invention is based on the edible oil quality method for quick identification of three-dimensional fluorescence spectrum, the light signal sent by xenon lamp is divided into monochromatic light through monochromator, beat again on the cuvette being placed with oil sample to be measured, excite oil sample emitting fluorescence to be measured, received by ccd image sensor after being collected by condenser lens again, then by data collecting card, the fluorescence spectrum obtained is formed matrix array, and transfer to computing machine, by computing machine, acquisition data and the comparative analysis of edible oil database are obtained a result; Its discrimination method is simple, differentiates that speed is fast, differentiate that accuracy rate is high, high specificity, and its identification device structure is simple, easy to connect.
The present invention utilizes three-dimensional fluorescence spectrum technology to differentiate edible oil quality fast, three-dimensional fluorescence spectrum technology be obtain corresponding emission spectrum by many group excitation wavelength excited sample excite-emission matrix, more common fluorescence spectrum has abundanter information content, the favourable sample analysis realizing complicated ingredient, be applied to water analysis, the fields such as tealeaves qualification and mineral oil analysis, the variety and quality qualification utilizing it to realize Various Edible has advantage.
Accompanying drawing explanation
Fig. 1 is the structural representation of identification device of the present invention;
Fig. 2 is the structural representation of monochromator in Fig. 1;
Fig. 3 is the former figure of the contour fluorescence spectrum of three-dimensional of olive oil;
Fig. 4 is the three-dimensional fluorescence spectrum figure of Various Edible kind;
Fig. 5 is Various Edible kind three-dimensional contour fluorescence spectrum variation diagram after heating.
Embodiment
Below in conjunction with accompanying drawing embodiment, the present invention is described in further detail.
Reference numeral is wherein: computing machine 1, data collecting card 2, ccd image sensor 3, cuvette 4, monochromator 5, light import 5a, light exit 5b, housing 51, reflective mirror 52, second concave mirror 54, first grating 55a, the second grating 55b, condenser lens 6, control circuit 7, xenon lamp 8.
Based on the edible oil quality method for quick identification of three-dimensional fluorescence spectrum, comprise the following steps:
Step one, oil sample to be measured is put into cuvette 4;
Step 2, open xenon lamp 8, xenon lamp 8 sends light signal and is divided into monochromatic light through monochromator 5, and monochromatic light is beaten and put into cuvette 4 putting into oil sample to be measured, excites oil sample emitting fluorescence to be measured;
Step 3, collect emitting fluorescence by condenser lens 6, then deliver to ccd image sensor 3 and received by it;
Step 4, excite the fluorescence spectrum obtained to form matrix array different excitation wavelength by data collecting card 2, and these matrix array data are delivered to computing machine 1;
The data of acquisition and the normal data in the edible oil database pre-deposited contrast by step 5, computing machine 1, analyze the kind and the quality that draw oil sample to be measured.
In embodiment, condenser lens 6 is vertical with emitting fluorescence to be arranged.Adopt vertical setting can collect emitting fluorescence better.
For an identification device for the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum, comprise the computing machine 1, data collecting card 2, ccd image sensor 3, cuvette 4, monochromator 5, condenser lens 6, control circuit 7 and the xenon lamp 8 that pre-deposit edible oil database; Described computing machine 1 is connected with control circuit 7 signal, this control circuit 7 respectively with xenon lamp 8, monochromator 5, data collecting card 2 and ccd image sensor 3 control linkage, described data collecting card 2 transmits with computing machine 1 data and is connected, described xenon lamp 8 is connected with cuvette 4 light signal through monochromator 5, and described cuvette 4 line focus lens 6 are connected with ccd image sensor 3 light signal.This identification device structure is simple, easy to connect.
In embodiment, monochromator 5 includes housing 51, be arranged at the light import 5a on described housing 51 and light exit 5b, in described housing 51, just reflective mirror 52 be tiltedly installed with to light import 5a place, in described housing 51, be also provided with the first concave mirror 53, second concave mirror 54 and grating.
In embodiment, grating comprises the first grating 55a and the second grating 55b, and the first described grating 55a and the second grating 55b be arranged in parallel.
The principle of work of monochromator 5:
Light (in Fig. 2 shown in dotted line) enters in housing 51 from light import 5a, incident light incides grating after being collimated by the first concave mirror 53 after reflective mirror 52 reflects again, light is divided into the monochromatic light of different wave length at grating place, then penetrates from light exit 5b after being collimated by the second concave mirror 54.
Wherein, the first grating 55a is applicable to the incident light that wavelength is 200nm ~ 600nm, and the second grating 55b suitable wavelength is the incident light of 500nm ~ 1000nm.
The present invention utilizes three-dimensional fluorescence spectrum technology can differentiate edible oil quality fast, and the normal data in its data by oil sample to be measured and edible oil database contrasts, and differentiates kind and the quality of oil sample to be measured.The ordinate Z axis of three-dimensional fluorescence spectrum is the fluorescence intensity of material emitting fluorescence, X-axis and Y-axis are respectively excitation wavelength and emission wavelength, what characterize is the set of different fluorescence emission spectrums changing with excitation wavelength and obtain, and these data can with the form display of 3 dimensional drawing or plane contour map.Stereographic map is by peak position, fluorescence intensity, main peak steepness and move towards the characteristic parameters such as angle and identify sample.Contour map is the result of stereographic map dimensionality reduction display, it solve peak in stereographic map and cover the problem of not easily observing, clearly can disclose the detailed construction of spectrogram, express complete fluorescence information, there is fingerprint, the object of sample being classified and differentiating can be reached.
The former figure of the contour fluorescence spectrum of three-dimensional of olive oil as shown in Figure 3, wherein, ordinate EX represents the wavelength of exciting light, and horizontal ordinate EM represents the wavelength of transmitted wave.
The fluorescence spectrum of different oil product has obvious difference; As shown in Figure 4, wherein a part is the fluorescence spectrum of olive oil, and b part is the fluorescence spectrum of sunflower oil, and c part is the fluorescence spectrum of sesame oil, and d part is the fluorescence spectrum of lard.Therefore according to the contrast of oil product to be measured and normal data, the kind of oil product to be measured can be differentiated.
And oil product before heating after, its fluorescence spectrum has obvious change, and along with the growth of heat time, has fluorescence peak centre wavelength to move to long wave direction, the feature of peak atenuation, can as the Spectral Identification index of edible oil quality quality.
As shown in Figure 5, Heating Experiment is carried out for olive oil and sunflower oil; In Fig. 5, a partly heats the fluorescence spectrum figure of 10 minutes for olive oil, and b partly heats the fluorescence spectrum figure of 20 minutes for olive oil, and c partly heats the fluorescence spectrum figure of 1 minute for sunflower oil, and d is partly for sunflower oil heats the fluorescence spectrum figure of 3 minutes.Contrast can find the increase along with the heat time, and its fluorescence spectrum figure has obvious change.
Table 1 is with fluorescence peak centre wavelength and fluorescence intensity change after the heating of kind edible oil
Can judge whether oil sample is rich in unsaturated fatty acid to the peakvalue's checking of the highest fluorescence peak of oil sample, whether freshly wait oil quality information.Because edible oil can be long along with the heat time, or standing time is long, and fluorescence generation efficiency declines, and mainly the composition such as free fatty acid composition and vitamin has thermal instability, makes original longer conjugation unsaturated compound partial valence bond rupture because being heated.Same edible oil after the heating of certain hour, as shown in Fig. 5 and table 1.Along with the growth of heat time, fluorescence peak intensity declines, and centre wavelength is elongated, and these as oil product freshness or can be rich in the how many index of unsaturated fatty acid, identify the quality of edible oil thus.
Most preferred embodiment of the present invention is illustrated, and the various change made by those of ordinary skill in the art or remodeling all can not depart from the scope of the present invention.
Claims (5)
1., based on the edible oil quality method for quick identification of three-dimensional fluorescence spectrum, it is characterized in that: comprise the following steps:
Step one, oil sample to be measured is put into cuvette (4);
Step 2, open xenon lamp (8), xenon lamp (8) sends light signal and is divided into monochromatic light through monochromator (5), and monochromatic light is beaten and put into cuvette (4) putting into oil sample to be measured, excites oil sample emitting fluorescence to be measured;
Step 3, by condenser lens (6) collect emitting fluorescence, then deliver to ccd image sensor (3) and by its receive;
Step 4, excite the fluorescence spectrum obtained to form matrix array different excitation wavelength by data collecting card (2), and these matrix array data are delivered to computing machine (1);
The data of acquisition and the normal data in the edible oil database pre-deposited contrast by step 5, computing machine (1), analyze the kind and the quality that draw oil sample to be measured.
2. the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum according to claim 1 is characterized in that: described condenser lens (6) is vertical with emitting fluorescence to be arranged.
3. for an identification device for the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum as claimed in claim 1, it is characterized in that: comprise the computing machine (1), data collecting card (2), ccd image sensor (3), cuvette (4), monochromator (5), condenser lens (6), control circuit (7) and the xenon lamp (8) that pre-deposit edible oil database; Described computing machine (1) is connected with control circuit (7) signal, this control circuit (7) respectively with xenon lamp (8), monochromator (5), data collecting card (2) and ccd image sensor (3) control linkage, described data collecting card (2) transmits with computing machine (1) data and is connected, described xenon lamp (8) is connected with cuvette (4) light signal through monochromator (5), and described cuvette (4) line focus lens (6) are connected with ccd image sensor (3) light signal.
4. the identification device of the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum according to claim 3, it is characterized in that: described monochromator (5) includes housing (51), be arranged at the light import (5a) on described housing (51) and light exit (5b), just reflective mirror (52) is tiltedly installed with to light import (5a) place in described housing (51), in described housing (51), is also provided with the first concave mirror (53), the second concave mirror (54) and grating.
5. the identification device of the edible oil quality method for quick identification based on three-dimensional fluorescence spectrum according to claim 4, it is characterized in that: described grating comprises the first grating (55a) and the second grating (55b), described the first grating (55a) and the second grating (55b) be arranged in parallel.
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