CN103575694A - Quick detection method for aflatoxin B1 of rice based on near infrared spectroscopy - Google Patents
Quick detection method for aflatoxin B1 of rice based on near infrared spectroscopy Download PDFInfo
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- CN103575694A CN103575694A CN201310555346.3A CN201310555346A CN103575694A CN 103575694 A CN103575694 A CN 103575694A CN 201310555346 A CN201310555346 A CN 201310555346A CN 103575694 A CN103575694 A CN 103575694A
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Abstract
The invention belongs to the field of food quality detection and in particular relates to a quick detection method for aflatoxin B1 of rice based on a near infrared spectroscopy. The quick detection method comprises collection of a rice sample material, spectral acquisition, measurement of aflatoxin B1 of the rice sample, spectral pretreatment, construction of a correction model, checking of the model and measurement of the aflatoxin B1 content of an unknown rice sample. The method disclosed by invention aims at basic research and discussion on quick and nondestructive detection of harmful substances of the rice and is used for detecting the aflatoxin B1 content of the rice based on the near infrared spectroscopy. The method has the advantages of simpleness, feasibility, high analysis speed, high detection precision, low analysis cost and the like and the advantages that the sample is not required to be pretreated and the environment cannot be polluted; a reliable basis can be supplied to control of the storage quality of the rice and the quality of a rice processed product.
Description
Technical field
The invention belongs to grain quality detection field, specifically, the present invention relates to a kind of paddy AFB based on near-infrared spectrum technique
1method for quick.
Background technology
Paddy rice is one of one of most important cereal crops ，Ye Shi China Three major grain crops in the world, and paddy industry has very important meaning for agricultural industrialization.Along with socioeconomic development, rice quality quality is more and more subject to people and pays close attention to.Paddy is after long storage, and due to the impact of reserve temperature, water grading factors, rice quality declines, and even can produce noxious material, such as the very large AFB of harm
1deng, consumer's health is brought to potential hazard, grain security is produced to material impact simultaneously.Paddy aflatoxin fast, Non-Destructive Testing is subject to the attention of the units such as scientific research institutions, quality testing department, state-owned large granary and grain processing enterprise day by day, as being this field worker's problem demanding prompt solution with fast, accurately detecting aflatoxin in paddy always.
In paddy, main dependence of aflatoxin detection manually completes in conjunction with chemically treated method for a long time, high, the consuming time length of this method testing cost, consume huge man power and material, simultaneously higher to testing staff's competency profiling, Technique Popularizing is restricted, and the consistance of detection efficiency and detection effect is all poor.
Except traditional chemical analysis method, some new technologies are used to aflatoxin in paddy and detect, such as liquid chromatography, euzymelinked immunosorbent assay (ELISA), immune affine method etc., although the method for these improvement can use manpower and material resources sparingly, but these methods are mostly because sense cycle is still longer, consume in a large number chemical reagent, and instrument price comparison is expensive, the more high reason of testing cost can not meet the requirement that grain quality is quick, harmless, low cost detects.Therefore, build a set of fast, harmless, efficiently, accurately detect aflatoxin in paddy, and do not have the technical system of high requirement to seem particularly important to testing staff.
Near-infrared spectrum technique has been a Fast Detection Technique with the fastest developing speed since the eighties in 20th century, in a lot of fields especially grain quality detection field, is widely applied.The advantage of near-infrared spectrum technique is just fast, can't harm, efficient, accurately.In recent years computer technology and Chemical Measurement develop into near-infrared spectrum technique is applied in Non-Destructive Testing paddy to aflatoxin provides may.Therefore, utilize near-infrared spectrum technique to set up that paddy aflatoxin is harmless, Fast Detection Technique system has most important theories meaning and practice significance.The present invention provides theoretical foundation for developing a set of near infrared Non-Destructive Testing paddy mycotoxin device, and expectation can be extended to this device in other cereal crops such as wheat, corn on this basis.
Summary of the invention
Object of the present invention is exactly for AFB in current paddy
1quantitatively detect the problem existing, overcome the defect that prior art exists, provide a kind of method based on near-infrared spectrum technique fast, harmless, efficiently, accurately detect AFB in paddy
1.
For achieving the above object, the technical solution used in the present invention is as follows: the collection of (1) sample material and the spectra collection of sample: collect the rice sample that aspergillus flavus is infected in various degree, for foundation and the correction of model, then apply near-infrared spectrometers and under same environmental conditions, gather paddy seed spectral information; (2) sample chemistry pH-value determination pH: the paddy seed that gathered near infrared spectrum is carried out to pulverization process and obtain paddy powder, adopt GB/T 5009.22-2003 national standard method to measure the AFB in paddy
1content; (3) calibration set and the pre-service of forecast set near infrared spectrum: calibration set paddy sample and forecast set paddy sample spectrum are carried out to pre-service, eliminate the interference of Aimless factors, improve accuracy of detection; (4) calibration model is set up: by multivariable analysis, with calibration set sample paddy AFB
1content is scaled values, and using forecast set sample paddy near infrared spectrum characteristic information data as independent variable, scaled values is as dependent variable, and application partial least square method builds paddy near infrared spectrum characteristic information and paddy AFB
1between chemometric model; (5) modelling verification: adopt the near infrared spectrum data of the forecast sample collection of pretreated paddy seed in step (3) to carry out performance evaluation to the model of step (4) structure; (6) unknown rice sample AFB
1the mensuration of content: the near infrared spectrum data that gathers paddy seed samples to be measured, use and with preprocess method identical in step (3), the near infrared spectrum data of paddy seed samples to be measured is carried out after pre-service, with the calibration model that step (4) is constructed, paddy seed samples to be measured is predicted.
Described step (1), the quantity of paddy sample is at least 60, and paddy sample is divided into calibration set sample and forecast set sample at random.
Described near-infrared spectrometers spectral scan scope is 10000cm
-1～4000cm
-1, resolution: 8cm
-1, scanning times: 64 times, replication three times, is averaged spectrum.
Described step (3), the pretreated method of spectrum comprises smoothly, second order differentiate, standardization, base-line shift, standard normal variable, polynary scatter correction, go trend method or the wherein combination of two or more methods.
The present invention is without any need for pre-treatment, and can realize fast, efficient, low-cost, pollution-free detection, reduce preferably the interference of external environment near infrared spectra collection simultaneously.
The preprocessing procedures that the present invention adopts can effectively extract the characteristic information of near infrared spectrum, reduces various Noise and Interferences, improves model prediction precision and stability.
Method provided by the invention can be a set of near infrared Non-Destructive Testing paddy mycotoxin device of development foundation is provided, and can on this basis this device be extended in other cereal crops such as wheat, corn.
Accompanying drawing explanation
Fig. 1 is the original near infrared light spectrogram of paddy seed;
Fig. 2 is the paddy seed near infrared light spectrogram of processing through second order differentiate;
Fig. 3 is sample predicted value and original value correlativity collection of illustrative plates.
Embodiment
Give an actual example below and describe the present invention by reference to the accompanying drawings.
(1) get the paddy sample of 30 natural infections and 50 water percentage be the paddy sample preserved at 25 ℃ of 16%-22% totally 80 samples as the Calibration of paddy seed and the Prediction of paddy seed, before scanning, naturally dry in the shade to paddy moisture stabilization at 10%-14%.Randomly drawing 2/3 sample is calibration set sample, and 1/3 is checking collection sample; At 25 ℃, open ANTARIS II type Fourier Transformation Near-Infrared Spectroscopy Analysis instrument preheating 30min, get 45g paddy seed and be put in sealing bag, before scanning, deaeration affects to reduce as far as possible; Adopt transmission integrating sphere type collection spectrum, spectral scan scope 10000cm
-1～4000cm
-1, scanning times 64 times, resolution 8cm
-1, sample multiple scanning 3 times, the absorption spectrum of collected specimens; Average as the near infrared spectrum data of Calibration and the near infrared spectrum data of Prediction (referring to accompanying drawing 1), for building AFB
1calibration model is prepared;
(2) the paddy seed that gathered near infrared spectrum is carried out to pulverization process and obtain paddy powder, adopt GB/T 5009.22-2003 national standard method to measure the AFB in paddy
1content;
(3) near infrared spectrum that adopts second order differentiate disposal route to obtain step (1) carries out pre-service (referring to accompanying drawing 2);
(4), according to the pretreated near infrared spectrum data of step (3), the partial least squares analysis method that adopts Unscrambler 10.3 softwares to provide, sets up AFB in the near infrared spectrum of Calibration of paddy seed and paddy
1calibration model between content;
(5) use through the pretreated forecast set sample of step (3) near infrared spectrum data, constructed calibration model is carried out to performance evaluation, in Table 1 and table 2;
(6), under identical environmental baseline, adopt method as herein described to unknown AFB
1the rice sample of content detects, use the preprocess method identical with step (3) to carry out pre-service to the spectroscopic data of rice sample to be measured, use the constructed calibration model of step (4) to predict rice sample to be measured, the model predication value of rice sample and the relation between reference value are shown in Fig. 3.
Table 1: AFB
1quantitative Analysis Model external certificate result
| Sequence number | Measured value | Predicted value | Residual error |
| 1 | 19.91 | 10.08 | 9.83 |
| 2 | 2.81 | 1.26 | 1.55 |
| 3 | 22.97 | 23.45 | -0.48 |
| 4 | 9.3 | 9.61 | -0.31 |
| 5 | 26.88 | 20.21 | 6.67 |
| 6 | 10.35 | 12.09 | -1.74 |
| 7 | 21.3 | 18.56 | 2.74 |
| 8 | 15.95 | 16.09 | -0.14 |
| 9 | 2.54 | 1.12 | 1.42 |
| 10 | 2.19 | 2.16 | 0.03 |
| 11 | 0.28 | 0.95 | -0.67 |
| 12 | 10.09 | 12.32 | -2.23 |
| 13 | 8.62 | 11.90 | -3.28 |
| 14 | 8.21 | 10.56 | -2.35 |
| 15 | 3.25 | 5.01 | -1.76 |
| 16 | 7.05 | 6.28 | 0.77 |
| 17 | 5.5 | 7.78 | -2.28 |
| 18 | 0.77 | 0.93 | -0.16 |
| 19 | 1.44 | 1.56 | -0.12 |
| 20 | 13.29 | 14.89 | -1.6 |
Table 2: AFB
1quantitative Analysis Model external certificate precision
| Related coefficient | Prediction standard deviation | Residual error standard value |
| 0.922 | 3.14 | 0.30 |
Claims (5)
1. the paddy AFB based on near-infrared spectrum technique
1method for quick, the concrete steps that it is characterized in that it are as follows: the collection of (1) sample material and the spectra collection of sample: collect the rice sample that aspergillus flavus is infected in various degree, for foundation and the correction of model, then apply near-infrared spectrometers and under same environmental conditions, gather paddy seed spectral information; (2) sample chemistry pH-value determination pH: the paddy seed that gathered near infrared spectrum is carried out to pulverization process and obtain paddy powder, adopt GB/T 5009.22-2003 national standard method to measure the AFB in paddy
1content; (3) calibration set and the pre-service of forecast set near infrared spectrum: calibration set paddy sample and forecast set paddy sample spectrum are carried out to pre-service, eliminate the interference of Aimless factors, improve accuracy of detection; (4) calibration model is set up: by multivariable analysis, with calibration set sample paddy AFB
1content is scaled values, and using forecast set sample paddy near infrared spectrum characteristic information data as independent variable, scaled values is as dependent variable, and application partial least square method builds paddy near infrared spectrum characteristic information and paddy AFB
1between chemometric model; (5) modelling verification: adopt the near infrared spectrum data of the forecast sample collection of pretreated paddy seed in step (3) to carry out performance evaluation to the model of step (4) structure; (6) unknown rice sample AFB
1the mensuration of content: the near infrared spectrum data that gathers paddy seed samples to be measured, use and with preprocess method identical in step (3), the near infrared spectrum data of paddy seed samples to be measured is carried out after pre-service, with the calibration model that step (4) is constructed, paddy seed samples to be measured is predicted.
2. the paddy AFB based on near-infrared spectrum technique according to claim 1
1method for quick, is characterized in that, the quantity of the described paddy sample of step (1) is at least 60, and paddy sample is divided into calibration set sample and forecast set sample at random.
3. the paddy aspergillus flavus based on near-infrared spectrum technique according to claim 1 is malicious
Element B
1method for quick, is characterized in that, described near-infrared spectrometers spectral scan scope is 10000cm
-1～4000cm
-1, resolution: 8cm
-1, scanning times: 64 times, replication three times, is averaged spectrum.
4. the paddy AFB based on near-infrared spectrum technique according to claim 1
1method for quick, is characterized in that, the pretreated method of the described spectrum of step (3) comprises smoothly, second order differentiate, standardization, base-line shift, standard normal variable, polynary scatter correction, go trend method or the wherein combination of two or more methods.
5. the paddy AFB based on near-infrared spectrum technique according to claim 1
1method for quick, is characterized in that, described detection method can be used for developing a set of near infrared Non-Destructive Testing paddy mycotoxin device, and can on this basis this device be extended in other cereal crops such as wheat, corn.
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| CN114002166A (en) * | 2021-10-29 | 2022-02-01 | 南京财经大学 | Hyperspectral imaging technology-based quantitative detection method for mildew of three aspergillus oryzae of rice |
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Application publication date: 20140212 |