CN109991115A - A kind of paddy new-old degree detection method - Google Patents
A kind of paddy new-old degree detection method Download PDFInfo
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- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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Abstract
The present invention discloses a kind of paddy new-old degree detection method.One specific embodiment of this method includes: that the polished rice sample or brown rice sample of paddy processing are successively dyed, washed and eluted, and obtains eluent；Light absorption value OD of the eluent at 610nm and 690nm wavelength is measured respectively610And OD690, and by △ OD=OD610‑OD690As polished rice sample or the seed damage index of brown rice sample；According to the polished rice sample or the seed damage index of brown rice sample, the old rice content of the polished rice sample or brown rice sample is calculated.The embodiment can accurately detect the new-old degree of paddy and rice.
Description
Technical field
The present invention relates to technical field of food science.More particularly, to a kind of paddy new-old degree detection method.
Background technique
After paddy long-term storage, after shelling or direct attrition process are at polished rice, the sensory attribute meeting of cooking rice
It changes, the variation of variation, quality including fragrance.Compared with new paddy, with old paddy processing at the rice of boiling after polished rice
Meal quality can be hardened, and adhesiveness/hardness ratio can reduce, and Chinese people mostly like the rice of fresh paddy processing.
Many physiology and physic-chemical changes can occur during rice storage, these variations influence whether the product of paddy seed
Matter.
On the one hand, quality or other physical and chemical attribute of the boiling at rice after polished rice can be processed by assessing, such as with rice
The relevant thermal characteristics of paste mixing behavior and Effect On Gelatinization Characteristics, measure the new-old degree of paddy.
On the other hand, the chemical attribute of paddy can also be used for the new-old degree measurement of seed, and this kind of detection technique is based on pH, trip
Activity from fatty acid and certain enzymes causes the change of indicator color.Paddy seed contains neutral fat, rice bran fats and phosphorus
Rouge, wherein neutral fat is in the great majority, they start deterioration after rice harvest, and oxidation occurs and decomposes, generates free-fat
Acid.These fatty acid are further broken into the products such as hexanal.With storage time, the fatty acid and hexanal quantity of generation increase,
It can reflect the new-old degree of paddy by measuring the content of fatty acid.National standard " paddy storage quality decision rule (GB/T
20569-2006) " using phenolphthalein as indicator, free fatty acid content in the coarse rice powder of titration measuring paddy processing, but due to
The interference of alcohol-soluble pigment leads to the bad judgement of titration end-point, and titration results are affected by operating process, and accuracy is difficult to protect
Card.
Paddy new-old degree measuring method based on chemical attribute can also be indicator solution with Bromothymol blue, by rice
The rice flour sample of paddy processing is placed in specific reagent solution, and the color change of reagent solution is judged after agitation, can reflect fat
The quantity of acid.Based on this, existing one kind is Publication No. EP1612542A1 based on chemical attribute paddy new-old degree detection method
Patent application publication the radiation of visible light reaction solution using specific wavelength, and measure light absorption value, judged based on light absorption value
The variation of reaction solution color.In order to exclude the interference that the fine graineds such as cortex, rice bran, starch cause reaction solution muddiness, this is specially
Benefit application measures the light absorption value of reaction solution using dual wavelength, with the difference △ OD=OD of the two absorbances615-OD690It indicates
The new-old degree of paddy.But the accuracy of this method is to be improved for China's rice variety, the diversity of type, testing result
Accuracy need to carry out for the long feature of different Grain Reserve Ecology area, China, different warehouse conditions and storage time
Mass data accumulation.
There are peroxidase (EC 1.11.1.7) in paddy seed, it is to participate in reactive oxygen species in seed to remove
One of key enzyme.During rice storage, peroxidase (POD) active loss can lead to the old of paddy seed
Change.Measurement POD activity can distinguish the paddy that different year harvests.The activity of this enzyme can be used as paddy seed new-old degree
Index.The especially variation of the influence of high-temperature high-humidity storage condition paddy free fatty acid and enzymatic activity.It is existing based on this
Another kind is using peroxidase chromogenic reaction liquid (guaiacol, adjacent connection based on chemical attribute paddy new-old degree detection method
Anisidine, H2O2And phosphate buffer), this method is surveyed by being stored 168 days with paddy and polished rice to 6 rice varieties of Thailand
Determine D385, find 1/D385Value is linearly increasing as storage time is shown, related coefficient (R) utilizes 1/ 0.8062~0.9949
D385It is also larger to indicate that the accuracy of the detection method of the new-old degree of paddy is fluctuated with different rice varieties.
The freshness of paddy and polished rice receives great attention in China's rice market, largely represents rice
Quality and price.In the case where new old paddy mixes, grain collection and storage enterprise can not using existing detection method
The new-old degree of grain is accurately detected, accordingly, it is desirable to provide a kind of new paddy new-old degree detection method.
Summary of the invention
The purpose of the present invention is to provide a kind of paddy new-old degree detection methods, to solve the problems, such as in of the existing technology
At least one.
In order to achieve the above objectives, the present invention adopts the following technical solutions:
The present invention provides a kind of paddy new-old degree detection methods, comprising:
The polished rice sample or brown rice sample of paddy processing are successively dyed, washed and eluted, eluent is obtained；
Light absorption value OD of the eluent at 610nm and 690nm wavelength is measured respectively610And OD690, and by △ OD=
OD610-OD690As polished rice sample or the seed damage index of brown rice sample；
According to the polished rice sample or the seed damage index of brown rice sample, the polished rice sample or brown rice sample is calculated
The old rice content of product.
Optionally, described according to the polished rice sample or the seed damage index of brown rice sample, the polished rice is calculated
The old rice content of sample or brown rice sample further comprises: by the seed damage index generation of the polished rice sample or brown rice sample
Enter linear equation, the old rice content of the polished rice sample or brown rice sample is calculated.
Optionally, the linear equation are as follows: △ OD=α x+ β, wherein x is the old rice of the polished rice sample or brown rice sample
Content, α are the first predetermined coefficient, and β is the second predetermined coefficient.
Optionally, for polished rice sample, the value range of the first predetermined coefficient α is [0.0006,0.073], described
The value range of second predetermined coefficient β is [0.0428,0.363].
Optionally, for polished rice sample, the value of the first predetermined coefficient α is 0.002, the second predetermined coefficient β
Value be 0.1387.
Optionally, for brown rice sample, the value range of the first predetermined coefficient α is [0.00006,0.0002], institute
The value range for stating the second predetermined coefficient β is [0.0067,0.0121].
Optionally, for brown rice sample, the value of the first predetermined coefficient α is 0.0001, the second predetermined coefficient β
Value be 0.0096.
Optionally, it successively dyed, washed and is eluted in the polished rice sample to paddy processing or brown rice sample, obtained
To before eluent, this method further include:
Judge the weight of rice sample: if the weight of the rice sample is more than or equal to 150 grams, by the rice sample
It is processed as polished rice sample；If the weight of the rice sample is processed as brown rice sample less than 150 grams, by the rice sample.
Beneficial effects of the present invention are as follows:
Technical solution of the present invention can accurately detect the new-old degree of paddy, especially mix in new old paddy
In the case where accurate detection result also can be obtained.
Detailed description of the invention
Specific embodiments of the present invention will be described in further detail with reference to the accompanying drawing；
Fig. 1 shows the flow chart of paddy new-old degree detection method provided in an embodiment of the present invention.
The situation of change schematic diagram for the new-old degree that Fig. 2 shows late long-grained nonglutinous rice A based on Bromothymol blue measurement during storage.
Fig. 3 shows the situation of change schematic diagram of new-old degree of the late long-grained nonglutinous rice B based on Bromothymol blue measurement during storage.
Fig. 4 shows the situation of change schematic diagram of new-old degree of the late long-grained nonglutinous rice C based on Bromothymol blue measurement during storage.
Fig. 5 shows the situation of change schematic diagram of new-old degree of the japonica rice D based on Bromothymol blue measurement during storage.
Fig. 6 shows the situation of change signal of new-old degree of the late long-grained nonglutinous rice A during storage based on Peroxidase Activity Determination
Figure.
Fig. 7 shows the situation of change signal of new-old degree of the late long-grained nonglutinous rice B during storage based on Peroxidase Activity Determination
Figure.
Fig. 8 shows the situation of change signal of new-old degree of the late long-grained nonglutinous rice C during storage based on Peroxidase Activity Determination
Figure.
Fig. 9 shows the situation of change schematic diagram of new-old degree of the japonica rice D during storage based on Peroxidase Activity Determination.
Figure 10 shows late long-grained nonglutinous rice A grain new-old degree detection method measurement based on the embodiment of the present invention during storage
Seed damage index situation of change schematic diagram.
Figure 11 shows late long-grained nonglutinous rice B grain new-old degree detection method measurement based on the embodiment of the present invention during storage
Seed damage index situation of change schematic diagram.
Figure 12 shows late long-grained nonglutinous rice C grain new-old degree detection method measurement based on the embodiment of the present invention during storage
Seed damage index situation of change schematic diagram.
Figure 13 shows japonica rice D grain new-old degree detection method based on the embodiment of the present invention measurement during storage
The situation of change schematic diagram of seed damage index.
Figure 14 shows the new-old degree index OD of paddy615-OD690The signal of correlation between old paddy percentage composition
Figure.
Figure 15 shows the new-old degree index 1/D of paddy385The schematic diagram of correlation between old paddy percentage composition.
Figure 16 shows seed damage index OD610-OD690The schematic diagram of correlation between old paddy percentage composition.
Specific embodiment
In order to illustrate more clearly of the present invention, the present invention is done further below with reference to preferred embodiments and drawings
It is bright.Similar component is indicated in attached drawing with identical appended drawing reference.It will be appreciated by those skilled in the art that institute is specific below
The content of description is illustrative and be not restrictive, and should not be limited the scope of the invention with this.
As shown in Figure 1, An embodiment provides a kind of paddy new-old degree detection methods, comprising:
The polished rice sample or brown rice sample of paddy processing are successively dyed, washed and eluted, eluent is obtained；
Light absorption value OD of the measurement eluent at 610nm and 690nm wavelength respectively610And OD690, and by △ OD=OD610-
OD690As polished rice sample or the seed damage index of brown rice sample；
According to polished rice sample or the seed damage index of brown rice sample, the old rice of polished rice sample or brown rice sample is calculated
Content, wherein the old rice content of polished rice sample or brown rice sample can directly characterize the old paddy content of rice sample, can also be direct
Characterize the old rice content in rice.
In some optional implementations of the present embodiment, referred to according to the seed damage of polished rice sample or brown rice sample
Number, the old rice content that polished rice sample or brown rice sample is calculated further comprises: by polished rice sample or the seed of brown rice sample
Shatter index substitutes into linear equation, and the old rice content of polished rice sample or brown rice sample is calculated.
In some optional implementations of the present embodiment, linear equation are as follows: △ OD=α x+ β, wherein x is polished rice sample
The old rice content of product or brown rice sample, α are the first predetermined coefficient, and β is the second predetermined coefficient.
In some optional implementations of the present embodiment, for polished rice sample, the value range of the first predetermined coefficient α
For [0.0006,0.073], the value range of the second predetermined coefficient β is [0.0428,0.363].Further, for polished rice sample,
The value of first predetermined coefficient α is 0.002, and the value of the second predetermined coefficient β is 0.1387.
In some optional implementations of the present embodiment, for brown rice sample, the value range of the first predetermined coefficient α
For [0.00006,0.0002], the value range of the second predetermined coefficient β is [0.0067,0.0121].Further, for brown rice sample
Product, the value of the first predetermined coefficient α are 0.0001, and the value of the second predetermined coefficient β is 0.0096.
In some optional implementations of the present embodiment, to paddy processing polished rice sample or brown rice sample successively
It dyed, washed and is eluted, before obtaining eluent, this method further include:
Judge the weight of rice sample: if the weight of rice sample is more than or equal to 150 grams, rice sample being processed as essence
Rice sample；If the weight of rice sample is processed as brown rice sample less than 150 grams, by rice sample.
In a specific example, the process of paddy new-old degree detection method provided in this embodiment is as follows:
S1, from peasant household or grain depot sample paddy as rice sample, brown rice sample is processed on hulling machine or in essence
It is processed into polished rice sample on rice machine, for polished rice sample, the rice of market purchase can also be directlyed adopt as sample.Wherein, add
Work at least needs 150 grams of rice samples at polished rice sample.If the weight of rice sample can also be processed into rough less than 150 grams
Rice sample carries out subsequent seed damage index and new-old degree detection, but rice sample is preferably processed as polished rice sample and is carried out
Detection, because the detection accuracy for polished rice sample is higher.Subsequent step is by taking polished rice sample as an example, it will be understood that, for
The operating process of brown rice sample is identical.
S2, the polished rice sample for accurately weighing 2 grams in parallel three times, every time can be simultaneously in 50mL round bottom plastic centrifuge tube
Operate 7 parts of polished rice samples.
S3, using 0.001molL-1NaOH solution prepares FCF dyestuff, compound concentration 0.005%.
S4, the 0.005%FCF dyestuff that volumetric quantities are 2 times of polished rice sample quality numerical value is added in centrifuge tube, is placed in and shakes
Concussion dyeing 10 minutes on bed.
S5, dyed with distilled water flushing after polished rice sample until that water is shown is colourless, generally rinse 3~5 times.
S6, be with volumetric quantities 2 times of polished rice sample quality numerical value 0.001molL-1NaOH solution elution samples, elution
Process can be used shakes 15min on being placed in shaking table.
S6, the eluent for drawing every part of polished rice sample, the elution of every part of polished rice sample is measured using visible spectrophotometer
Light absorption value OD of the liquid at 610nm and 690nm wavelength610And OD690.Wherein, dust pollution eluent should be avoided in continuous mode.
S7, by the corresponding △ OD=OD of the eluent of every part of polished rice sample610-OD690Seed as corresponding polished rice sample
Shatter index, by the seed damage index △ OD=OD of every part of polished rice sample610-OD690It substitutes into linear equation and calculates every portion of polished rice
The old paddy content of the old paddy content of sample, every part of polished rice sample also characterizes the old paddy content of rice sample.
Below by one group of experiment to paddy new-old degree detection method provided in this embodiment (with D610-D690Indicate) and it is existing
Some indicates the new-old degree of paddy (with D based on Bromothymol blue indicator measurement light absorption value615-D690Indicate) and based on peroxide
Compound enzyme assay light absorption value indicates the new-old degree of paddy (with 1/D385Indicate) accuracy compare, illustrate that the present embodiment mentions
The validity of the grain new-old degree detection method of confession.
The data of this experiment are that three kinds of evening long-grained nonglutinous rices (A, B, C) of criticality safety moisture content and a kind of japonica rice (D) stored up at 170 days
Detection case during hiding.Measure D615-D690Using coarse rice powder, 1/D is measured385Using brown rice seed, D is measured610-D690Using
Polished rice seed.Four rice varieties are with band hull shape formula in four kinds of Temperature Humidity Combinations (20 DEG C of-RH, 65%, 37 DEG C of-RH 75%, 20
75%) DEG C 75%, 35 DEG C of-RH of-RH stores 170 days, as shown in Figure 2-5, the paddy of (35 DEG C and 37 DEG C) of high temperature storages it is new
Chen Du index OD615-OD690It first increases in first 30 days, persistently reduces later, and the paddy of (20 DEG C) of quasi- low temperature storages is new old
Spend index OD615-OD690It is significantly higher than the new-old degree index OD of the paddy of 35 DEG C of storages during 60~180 days615-OD690.Such as
Shown in Fig. 6~9, the new-old degree index 1/D of paddy385It presented during storage at 170 days and first increases, then reduce, then raised change
Change trend, the new-old degree index 1/D of the paddy of 35~37 DEG C of storages385It is significantly higher than the paddy of 20 DEG C of storages.Such as Figure 10~13
It is shown, in storage 60 days, the seed damage index OD of paddy610-OD690First increase, remain unchanged later or the trend of reduction,
The seed damage index OD of the paddy of (20 DEG C) of quasi- low temperature storages610-OD690It is significantly higher than 35~37 DEG C during 60~170 days
The seed damage index OD of the paddy of storage610-OD690.These results indicate that 1. paddy new-old degree index with storage time change
Change is OD615-OD690(high-temperature storage) persistently is reduced after storage 30 days, or remains unchanged (quasi-low-temperature storage)；1/D385It is storing up
60~90 days lasting raisings (high-temperature storage) in hiding, or remain unchanged/reduce (quasi-low-temperature storage).Seed damage index OD615-
OD690It is increased in storage 60 days, reduces (high-temperature storage) later, or the extremely significant raising in storage 60 days, remained unchanged later
Or reduction amplitude is small (quasi-low-temperature storage).2. quasi-low-temperature storage paddy has higher after storage 60 days compared with high-temperature storage
New-old degree index OD615-OD690With seed damage index OD610-OD690, and lower new-old degree index 1/D385.3. this into
One step explanation, after rice storage 60 days, if OD615-OD690And OD610-OD690Reduce, and 1/D385It increases, it is meant that paddy
Ageing (quality deterioration) process is activated.
Further compare the late long-grained nonglutinous rice new-old degree index OD that different temperatures is stored 1 year615-OD690With seed damage index
OD610-OD690.As shown in table 1, the rice sample of inventory's half a year was at the various temperature storages in laboratory 1 year, with 15 DEG C of rice samples
Compare, the OD of 25 DEG C of storage rice sample milled rice flours615-OD690With the seed damage index OD of polished rice610-OD690It keeps not
Become.And 1 year rice sample of inventory is stored 1 year at 15 DEG C and 25 DEG C, and compared with 15 DEG C of rice samples, 25 DEG C of storage paddy samples
The OD of product milled rice flour615-OD690With the seed damage index OD of polished rice610-OD690Dramatically increase.As shown in table 2, with 4 DEG C and
15 DEG C of storage temperature compare, and the brown rice shatter index of the southern japonica rice variety processing of two of 25 DEG C and 35 DEG C storages significantly reduces.
The new-old degree that the northeast that three kinds of methods are examined produces japonica rice paddy is compared deeper into a step, is all made of brown rice sample, such as
Shown in table 3, the OD of coarse rice powder615-OD690With the 1/D of brown rice seed385It is not significant to fresh paddy and old paddy difference, and it is rough
The shatter index OD of rice seed610-OD690Fresh paddy and old paddy are significantly distinguished.These results of study show and paddy
New-old degree index OD615-OD690And 1/D385Equally, the shatter index OD of polished rice or brown rice seed610-OD690It is new to can be used for paddy
Chen Du detection, is based especially on polished rice seed damage index OD610-OD690It is more reliable to detect new-old degree.
1 different temperatures of table stores the new-old degree index OD of 1 year Chongqing producing region evening long-grained nonglutinous rice milled rice flour615-OD690With polished rice
Seed damage index OD610-OD690
Significant difference (p < 0.05) between the not identical lowercase alphabet sample product of same row in LSD inspection.
2 different temperatures of table stores the brown rice shatter index OD of two japonica rice of southern area processing in 1 year610-OD690
Note: it is small that 40-4,40-15,40-25,40-35 fresh paddy of expression handle 72 under the conditions of 40 DEG C of-RH 85%
When, then stored 1 year at 4,15,25,35 DEG C respectively.It is poor between the not identical lowercase alphabet sample product of same row in LSD inspection
Different significant (p < 0.05).
Table 3 examines a kind of new-old degree of northeast production japonica rice paddy using three kinds of methods
Significant difference (p < 0.05) between the not identical lowercase alphabet sample product of same row in LSD inspection.
In the case that old paddy and fresh paddy are admixed together, the detection method for seeking quick and convenient has very sternly
High challenge.Old japonica rice paddy and fresh japonica rice paddy are mixed in a certain proportion, for brown rice sample, using three kinds of methods
The new-old degree of the mixing paddy of measurement is as shown in Figure 14~16, and in the range of old paddy content 60%, brown rice seed damage refers to
Number OD610-OD690Linearly dependent coefficient between old paddy percentage composition is 0.9623, and the OD of coarse rice powder615-OD690, it is rough
The 1/D of rice seed385Linearly dependent coefficient between old paddy percentage composition is for 0.5515 and 0.8701 respectively.As it can be seen that this
The accuracy for the detection method that embodiment provides is higher.Paddy new-old degree detection method provided in this embodiment is based on 37 pairs of rice
The artificial mixing of (polished rice) sample and the artificial mixing of 4 pairs of brown rice samples give seed damage index and contain with old rice percentage
Measure the linear equation of (0~55% range).
It should be noted that in the description of the present invention, relational terms such as first and second and the like are used merely to
It distinguishes one entity or operation from another entity or operation, without necessarily requiring or implying these entities or behaviour
There are any actual relationship or orders between work.Moreover, the terms "include", "comprise" or its any other variant
It is intended to non-exclusive inclusion, so that including that the process, method, article or equipment of a series of elements not only includes
Those elements, but also including other elements that are not explicitly listed, or further include for this process, method, article or
The intrinsic element of person's equipment.In the absence of more restrictions, the element limited by sentence "including a ...", not
There is also other identical elements in the process, method, article or apparatus that includes the element for exclusion.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention for those of ordinary skill in the art on the basis of the above description can be with
It makes other variations or changes in different ways, all embodiments can not be exhaustive here, it is all to belong to the present invention
The obvious changes or variations extended out of technical solution still in the scope of protection of the present invention.
Claims (8)
1. a kind of paddy new-old degree detection method characterized by comprising
The polished rice sample or brown rice sample of paddy processing are successively dyed, washed and eluted, eluent is obtained；
Light absorption value OD of the eluent at 610nm and 690nm wavelength is measured respectively610And OD690, and by △ OD=OD610-
OD690As polished rice sample or the seed damage index of brown rice sample；
According to the polished rice sample or the seed damage index of brown rice sample, the polished rice sample or brown rice sample is calculated
Old rice content.
2. the method according to claim 1, wherein described according to the polished rice sample or the seed of brown rice sample
Shatter index, the old rice content that the polished rice sample or brown rice sample is calculated further comprises: by the polished rice sample or
The seed damage index of brown rice sample substitutes into linear equation, and the old rice content of the polished rice sample or brown rice sample is calculated.
3. according to the method described in claim 2, it is characterized in that, the linear equation are as follows: △ OD=α x+ β, wherein x is institute
The old rice content of polished rice sample or brown rice sample is stated, α is the first predetermined coefficient, and β is the second predetermined coefficient.
4. according to the method described in claim 3, it is characterized in that, for polished rice sample, the value of the first predetermined coefficient α
Range is [0.0006,0.073], and the value range of the second predetermined coefficient β is [0.0428,0.363].
5. according to the method described in claim 4, it is characterized in that, for polished rice sample, the value of the first predetermined coefficient α
It is 0.002, the value of the second predetermined coefficient β is 0.1387.
6. according to the method described in claim 3, it is characterized in that, for brown rice sample, the value of the first predetermined coefficient α
Range is [0.00006,0.0002], and the value range of the second predetermined coefficient β is [0.0067,0.0121].
7. according to the method described in claim 6, it is characterized in that, for brown rice sample, the value of the first predetermined coefficient α
It is 0.0001, the value of the second predetermined coefficient β is 0.0096.
8. the method according to claim 1, wherein in the polished rice sample or brown rice sample to paddy processing
It successively dyed, washed and is eluted, before obtaining eluent, this method further include:
Judge the weight of rice sample: if the weight of the rice sample is more than or equal to 150 grams, the rice sample being processed
For polished rice sample；If the weight of the rice sample is processed as brown rice sample less than 150 grams, by the rice sample.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110361511A (en) * | 2019-07-19 | 2019-10-22 | 安徽工程大学 | A method of the rice store time is judged using the hot swelling value of SDS |
| CN110361307A (en) * | 2019-08-15 | 2019-10-22 | 安徽工程大学 | A method of rice new-old degree is judged using particle size distribution characteristic value |
| CN113916715A (en) * | 2021-10-08 | 2022-01-11 | 国家粮食和物资储备局科学研究院 | Method for detecting freshness of rice |
| CN114088635A (en) * | 2021-11-18 | 2022-02-25 | 中南林业科技大学 | Rice grain freshness nondestructive quantitative detection method and system based on polarized light technology |
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| CN114088635A (en) * | 2021-11-18 | 2022-02-25 | 中南林业科技大学 | Rice grain freshness nondestructive quantitative detection method and system based on polarized light technology |
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