JPS63167243A - Method for measuring component content of rice - Google Patents

Abstract

PURPOSE:To easily measure the component content of rice to affect its taste by measuring the near IR absorptivity of the rice ground to <=50mum. CONSTITUTION:A rice sample is passed between rollers 20 and 21, then through rollers 22 and 23 for fine powder and is thereby ground to fine particles sized <=50mum. The ground sample is dropped, compressed and packed into a container 33 and is then sent to the lower part of a measuring part 11. Near IR rays of an arbitrary wavelength region past a filter 6 are projected and the detection signal of a transmitted light quantity detector 9 and the detected value of the quantity of the light reflected to an integrating sphere 7 are fed to a control device 59. The contents of the major components of the rice are computed by the component conversion factor value and temp. correction value inputted in a memory device 61 from the detected value mentioned above and the detected value of the sample temp. of a temp. detector 5. Since the quick measurement with high accuracy is easily executed, the control of rice purchase, etc., are rationalized.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for measuring the content of each component that affects the taste of rice.

[Prior art and its problems]

The taste of rice depends on the selection of variety, production area, and cultivation method.

There are a wide variety of factors, including those determined at the production stage such as the harvesting method, those determined at the post-harvest processing stage such as drying, storage, and rice milling, and those affected during the rice cooking process. , the production stage is the most affected, followed by the processing stage.

In general, Koshihikari and Sasanishiki are popular brands with good taste, but the main factor that makes them good in taste is the high content of amylose in the starch compared to other general brands. This is due to its low protein content and low protein content. A high moisture content is also a condition for good taste. Of course, the content of amylose and protein in starch may not be the same even if the brand is the same, and it may vary depending on the conditions of the region where it was grown (soil quality, water quality), or the weather conditions (temperature, sunshine hours, rainfall). etc.), so even if the taste rating of the previous year was high, there is no guarantee that the taste of the rice harvested this year will be the same as that of the previous year. Relying on taste data to determine rice purchasing or blending is not necessarily rational rice management.

- As an example, the amylose and protein contained in standard polished white rice of each brand of rice are as shown in the table below.

(Protein indicates the ratio to rice) Therefore,
We chemically measure the amylose or amylopectin content, protein and water content of rice, rather than focusing on specific famous brands, and find high-quality rice from general brands, as well as rank low in taste. The theme is how to improve the taste of rice. Normally, it is difficult for rice milling factories to secure only a single brand of rice, and the rice is milled by blending several brands of rice, with a moderate mix of rice ranked high and low ranked in taste evaluation. Polished rice with stable taste is distributed, but the reality is that the processing of Korekasa relies on intuition based on the combination of brand and production area, and there is no chemical proof, so the taste is poor. Consumers often complained about the lack of uniformity.

(Problems to be Solved by the Invention) Conventionally, methods for evaluating the taste of cooked rice include a sensory test in which the rice is actually eaten and sensory-evaluated, or a method in which the viscosity and hardness are measured through physical measurements to evaluate the taste. There are devices such as Brabender amylograph and texturometer.
etc. are known. In addition, there are methods for evaluating taste by chemically measuring the contained components, and methods for chemically measuring amylose or amylopectin in starch include the iodine colorimetric method and the iodine amperometric titration method. The method also had problems in that it required considerable skill for measurement, had large variations, and required a long time for measurement.

In order to solve the problems of the prior art, the present invention provides a method for measuring the content of ingredients in rice that uses near-infrared rays to easily and accurately measure the content of ingredients that affect the taste of rice. This is the purpose.

[Means for solving problems]

In the method for measuring the content of the main components of rice of the present invention, the sample is
Grind into particles of 0 micron or less, and add to the ground sample,
The components of rice are calculated based on the absorbance calculated from the amount of reflected light obtained by irradiating near-infrared rays, or the amount of transmitted light, or the combination of the amount of reflected light and transmitted light, and the component measurement values measured by chemical analysis methods. We used the method of calculating .

(Function) In order to accurately measure the ingredient content ■ of rice by irradiating the sample with near-infrared rays, it is necessary to use a crushed sample.
Absorbance is related to changes in thermal vibration due to differences in the chain structure of atoms in molecules, and since the size of rice molecules is approximately 10 microns, it is necessary to arrange the molecules uniformly on the surface of the measurement sample, so the size of the particles must be determined. The thickness should be less than 50 microns.

The table shown below shows, as an example, the size of the particles obtained by crushing the sample and the accuracy of the measured value, when the amylose content value is taken as 100%.

Measurement of the relationship between particle size and measurement accuracy Particle size (micron) Accuracy is achieved by using submicron particles and particles.

(Example) Embodiments of the present invention will be described with reference to FIGS. 1 to 8.

In FIGS. 1 and 2, a light source 4 and a reflecting mirror 5 are arranged in relation to each other in the upper part of the cabinet 2 of the near-infrared spectrometer 1 indicated by the reference numeral 1. Filters 6 for specific wavelengths are provided. Filter 6・
... are connected to an electric motor 510, and the intersection angle between the irradiation optical axis and any filter 6 can be arbitrarily set by slight rotation of the electric motor 10. A window 8 is provided at the top of the integrating sphere 7 to take in near-infrared rays of a specific wavelength that have passed through the gap between the slits 3. A reflected light amount detector 9A is provided inside the lower part of the integrating sphere 7.
9B are provided in symmetrical positions, the bottom of the integrating sphere 7 is opened to form a measuring section 11, a transparent plate 12 is provided in the measuring section 11, and a transmitted light total detector 9C is disposed below the transparent plate 12. A sample supply device 13 is disposed on the side inside the cabinet 2. The sample supply device 13 is equipped with a supply hopper 15 by opening the upper wall-side part 14 of the cabinet 2, and is provided with a shutter 17 that can freely slide to open and close an opening 16 of the hopper 15.
An electromagnet 18 is connected to the shutter 17, and a level meter 19 is attached to the side wall. A pair of rollers 20.21 having a large number of sharp edges are rotatably mounted on the shafts at the bottom of the hopper 15, and a pair of fine powder rollers 22.23 with smooth surfaces are further below the rollers 20.21 and rotated oppositely. Freely mount the shaft,
Said rollers 20.21.22.23 inside the grinding chamber 24
Cleaning devices 25A to 25D are provided opposite to the spray nozzle having a solenoid valve and an elastic member that contacts the roller.

A pulverized grain sorting device 26 is disposed in the lower part of the pulverizing chamber 24, and the sorting device 26 has a vibrating frame 28, which has a coarse particle discharge port 27 fixedly attached to the negative side thereof, supported by a plate spring 29'. ,
A perforated wall plate 30 is provided on the vibrating frame 28 in a detachable manner, and an electromagnet 32 is fixedly installed adjacent to a side surface 31 of the vibrating frame 28.

Sample container 33 filled with crushed samples below the sorting device 26
(See Figure 3). The sample container 33 has a bottom wall made of a transparent material, and can be freely inserted into and removed from a guide groove 36 provided in a container holder 35 mounted on a sample container moving body 34. Sample container 33
As a moving vJ structure, a sample container moving body 34 with a rack 37 fixed to the negative side is used as a hollow shaft, and a track shaft 38 having a round cross section is inserted into the moving body 34, and one side 39 of the track shaft 38 is inserted into the moving body 34. The other side part 41 is mounted on the rotation handle 40 and the other side 41 is mounted on a bearing stand 42, the fulcrum stand 44 is attached to the support stand 43 fixed to the bottom wall of the cabinet 2, and the motor 4 is attached to the rack 37 of the sample container moving body 34.
5 is meshed with a gear 46 that is pivoted to
At the same time, an electromagnet 48 with an extendable iron is rotatably connected to a motor 47 and a fulcrum 44.

Reference numeral 49 denotes a rotating roller serving as a sample filler for compressing and filling the crushed sample on the sample container 33 and removing the excess omega sample, and 50 indicates a filling part position for setting the position of the sample container 33 in the filling part. A sensor 51 is a measuring part position sensor for setting the position of the sample container 33 in the measuring part, and the sensor 51 and the transmitted light amount detector 9C are each attached to a support rod fixed to the motor 45. 63 is an electric motor that rotationally drives the rollers 20, 21, 22, 23 and the rotating roller 49. Reference numeral 52 denotes a spray nozzle for removing the sample from the inside of the sample container 33 with a blast of air and cleaning it, 53 a receiving box for receiving an unnecessary sample, and 54A fixedly attached to the sample container moving body 34 for cleaning the sample container by coming into contact with and separating from the transparent plate 12. It is a cleaning device, and 54B is a cleaning device for cleaning the surface of the transmitted light amount detector 9C. A thermistor for detecting the sample temperature is embedded in the side wall of the concave portion of the sample container 33 to serve as a temperature detector 65,
A terminal 66 connected to the temperature detector 65 is made to protrude from the outer wall of the sample container 33, and the temperature detector 65 is connected to the outer side of the integrating sphere 7.
A crimp portion 67 of the terminal 66 is provided, and the crimp portion 67 is electrically connected to a control device 59 to be described later.

On the front side of the cabinet 2, there is a display device 55 consisting of a display device 55A. Operation buttons 56...9 Manual operation button 5
6A, an automatic operation button 56B, a transmitted light amount measurement selection button 56C, and a reflection/transmission combination selection button 56D. 58 is a printer, 59 is a control device, which includes a storage device 61 in which component analysis coefficient values, humidity setting values, and temperature correction values for calculating the analysis values of components that affect the taste of rice, an arithmetic device 60, and a signal It is equipped with a processing device 62 and the like.

In FIG. 4, 57 is an external sample supply section provided at the front opening of the cabinet 2.

Next, the configuration of the control device 59 will be explained with reference to FIG. Arithmetic device 60. Storage device 61. On the input side of the control device 59, which includes a signal processing device 62, etc., there is a reflected light amount detector 9A.
, 9B, transmitted light amount detector 9C, level meter 191 position sensor 50° 51, automatic operation button 56B2 reflection/transmission combination selection button 56D, temperature detector 65.78. The keyboards 64 are connected to each other, and a display device 55. is connected to the output side of the control device @59. The printer 58 is connected, and the light source 4
．． Electric motor 10.63° Electromagnet 18.32, 48. Motor 45. The cleaning devices 25A to 25D and the spray nozzle 52 are connected to the output sides of the five control devices via drive bags @68 to 76, respectively.

The operation of the above configuration will be explained below with reference to FIGS. 1 to 8. From the keyboard 64, the component conversion coefficient value, temperature setting value, and temperature correction value calculated to calculate the content of the main components of rice are set in the five storage devices 61 of the control device, or input into the storage devices in advance. . (Step S+).

As an example, a method for measuring amylose components will be explained.

The amylose component conversion coefficient value is based on the content measured using chemical quantitative analysis methods such as iodine colorimetric method and iodine amperometric titration method on a large number of samples, and any detected value from the light receiving element is used as a signal. The processed values are calculated using a multiple regression analysis (also called multidimensional regression analysis) program.

Here, an example of multiple regression analysis is shown. For example 5 filters F 1 - 2100 nttl, F 2 = 2150
nm.

F3=2250nm, F4=2250nm,
It is assumed that the following linear relationship holds when F s =2370 nm.

Aa =FO+F1 ・X+a +F2 ・X2a +
F3-X3a+F4・X4a+F5°Xsa+C Aa is the percent content of amylose measured by chemical quantitative analysis of sample a.

FO to F5 are coefficient values obtained by this multiple regression analysis.

X+a−Xsa corresponds to the filter numbers of F + to F S, respectively, and is the absorbance (logIo/I) of sample a measured with a near-infrared spectrometer.

C is an error term, and here C=0.

In the case of sample a (assuming the solid line in Figure 9), X+a =
0.61, X2a = 0.56, X38 =
0.54, X4 a = 0.66, Xs a
= 0.65, and the multiple regression equation is Aa =FO+ 0.61 F1+ 0.56 F2
+0.54 F3 +0.66 F4 +0.65
It becomes F5.

Similarly, by substituting the absorbance into the multiple regression equation for up to n samples, the following component conversion coefficient values can be obtained.

A=33.3+238QX l -2300X 2-6
40× 3 +1405 Because the natural frequencies differ, the magnitude of vibration changes in the near-infrared wavelength region, causing heat absorption. Also, if the sample initially has little thermal energy (low temperature)
Because the vibrations are small, absorption waves due to differences in molecular structure cannot be measured accurately, so it is necessary to correct for temperature. What is shown in FIG. 7 is a temperature sensor 65 as an experimental example.
This shows a temperature correction value for correcting the measured value of amylose based on the detected temperature. If the temperature is 20℃ or higher, no correction is required, but if the temperature is 10℃, 1.0% will be added to the purchase price. Moreover, the change was approximately linear during that period.

The temperature setting value is used to adjust the near-infrared spectrometer to a constant temperature, and is usually set at 25°C. This has the purpose of preventing changes in the sample temperature and eliminating errors due to temperature in the electric circuit, especially the signal processing device. Using a similar method, component conversion coefficient values are set for the main components of rice, and the contents are measured.

Next, when the reflection/transmission light quantity measurement combination selection button 56D and the automatic operation button 56B are pressed (step S2), the near-infrared component analyzer 1 is energized, the light source 4 is turned on, and the apparatus 1 is maintained at a constant temperature. Activate the temperature controller 77 to
(Step S3), once with the signal of the detector 78 (Step $4), the electric motor 63 is ONL, and the rollers 20.21.
22, 23 and the rotating roller 49 are rotated (step S4), and then the electromagnet 32 is energized to vibrate the vibration frame 28 (step Se). Sample container 3
The filling part position sensor 50 detects that 3 is located at the sample filling position (step S7), then the level meter 19 detects whether the sample is being supplied to the supply hopper 15 (step S8). , the electromagnet 18 opens the shutter 17 and the sample flows out (step 8).
9). The sample, which has been crushed by passing between the rollers 20 and 21, is passed between the coarse powder rollers 22 and 23 to be crushed into fine particles of 50 microns or less (Step SI), and the crushed sample is passed through the vibrating porous wall plate 30. It flows upward and undergoes grain sorting action (step 511). Particles of 50 microns or less that have passed through the holes in the porous wall plate 30 flow down onto the sample container 33 , and excessive samples that have piled up on the sample container 33 flow down into the receiving box 53 and flow down onto the sample container 30 . The remaining coarse particles flow out into the receiving box 53 via the coarse particle outlet 27 (step 5r2).

In response to a signal from the level meter 19 that detects that the sample supplied into the supply hopper 15 has been completely discharged (step 513), the motor 45 is activated to move the sample container moving body 34.
move. During the movement process, the sample container 33
The raised sample is transferred to the sample container 3 by the rotating roller 49.
3 is compressed and filled, and the upper surface is made flat to allow excess sample to flow out into the receiving box 53.
The measurement unit position sensor 5 indicates that the predetermined position at the bottom has been reached.
1, the operation of the motor 45 is stopped (step S14), and measurement by the near-infrared component analyzer 1 is started based on the stop signal.

First, the electric motor 10 is operated to select a filter 6 for a specified arbitrary wavelength band. The irradiation light from the light source 4,
A control device 59 receives a detection signal from a transmitted light amount detector 9C that irradiates a sample in a sample container 33 with near-infrared rays in a specified wavelength range through a specified filter 6 and detects the amount of transmitted light transmitted through the sample.
Also, the reflected light component reflected from the sample to the integrating sphere 7 is detected by the reflected light amount detectors 9A and 9B, and the detected value is communicated to the control device 59 (step SS, I6). Moreover, when measuring with a plurality of wavelength bands, each detector 9A, 9B.

Upon communication of the detection signal 9C, the electric motor 10 is operated to sequentially rotate the filters 6...
Detect the amount of transmitted light and the amount of reflected light obtained from the characteristics of the near-infrared wavelength band obtained by and inform the control device 59 (step ST7.+8). A half-value width of a wavelength range of ±100 m is provided for each. It is checked whether the detection by each filter 6 has been completed, and if it is not a predetermined number of times, detection is continued until the predetermined number of times is reached (step 519).

Next, the temperature of the sample inside the sample container 33 is detected by the temperature detector 65, the detected value is communicated to the control device 59 via the terminal 66 and the crimping part 67, and (steps S20 and S21) the detection signal is input. Upon completion, the motor 45 and the cleaning devices 25A to 25D are operated, and the cleaning devices 25A to 25D clean the circumferential surface of each roller 20, 21, 22, and 23 by jetting high-pressure air (step 522), and the motor 45 cleans the sample. The container moving body 33 is moved in the direction of the crushing drop 24, and when the filling section position sensor 50 detects that the sample container 33 has reached a predetermined position, the operation of the motor 45 is stopped (step 523). During the movement process of the sample container moving body 34, the cleaning device 54A cleans the transparent plate 12 at the bottom of the measuring section 11. Step S2 to stop the operation of the cleaning devices 25A to 25D when the predetermined time of the timer T2 has elapsed.
4, 25), the operation of the electromagnet 18 is stopped and the shutter 17 of the supply hopper 15 is closed (step 526).

When the sample container 33 reaches a predetermined position in the filling section, the electromagnet 4
8 to rotate the sample container moving body 34 along with the motor 45 by 90'' about the orbital axis 38.

At this time, the cleaner 54B comes into contact with the transmitted light amount detector 9C to clean it (step 527). The injection nozzle 52 injects high-pressure air into the sample container 33 to remove the sample and clean the sample container 33 (step 528). Step 829. After the injection nozzle 52 has operated for a certain period of time, the operation of the injection nozzle is stopped. :II>, the electromagnet 48 is stopped and the sample container moving body 34 is returned to its normal position in preparation for the next sample measurement (step 531). Based on the detected values of the transmitted light amount detector 9C, the reflected light amount detectors 9A and 9B and the temperature detected value of the temperature detector 65, which are connected to the arithmetic device 60 of the control device 59, the content injury storage device 61 of the main components of rice is stored.
Calculation is performed using the respective component conversion coefficient values input into and the temperature correction value. The content m of the main components is digitally displayed on the display 55A in front of the cabinet 2, and is automatically printed and dispensed by the printer 158 (steps 332 to 534).

When the manual operation button 56A is operated to perform measurement by filling the sample container 33 with a sample from the outside, the rotation handle 40 is pushed toward the measurement section 11, and the sample container 33 is filled with the sample from the outside.
is pulled out from the external supply section 57, and 50
After filling a sample container with a sample crushed into particles of micron size or less and pressurizing the upper surface to a flat surface, the sample container 33 is inserted into the guide groove 36 of the container holder 35, and the sample container 33 is placed in the measuring section 11.
equipment and perform measurements.

In order to accurately obtain the detected value of the content, it is necessary to crush the sample to be filled into the sample container into small particles, and as mentioned above, the particles should be 50 microns or less, but they can be sorted by sieving. If the crushed coarse particles are excluded, the measurement will be partial and will lead to measurement errors, so it is desirable to repeat the crushing action twice.

As can be seen from the table above, the measurement accuracy varies depending on the size of the particles, so it is desirable that the measurement accuracy be ±0.1% or less. Pores should be used that result in particles no larger than 50 microns. In addition, the sample is crushed outside the near-infrared component analyzer 1, and the sample is sent to the external supply section 57.
Similarly, when measuring by equipping the measurement unit 11 with the powder, the measurement accuracy can be ensured by sieving the pulverized particles and filling only the particles with a size of 50 microns or less into the sample container 33. The reason for this is that the size of starch molecules is about 10 microns, and if the starch molecules are not pulverized, they will not appear uniformly on the surface and the near-infrared vibrations of the molecules will not be accurately expressed.

In addition, in the above description, for convenience of explanation, the transmitted light amount detector 9C
Although the measurement is performed based on the detected values of the reflected light amount detectors 9A and 9B, the measurement may be performed using either the reflected light amount or the transmitted light amount. Additionally, a temperature sensor may be installed inside or outside the cabinet to detect the air temperature.

The filter 6 and the irradiation optical axis can be set at any angle by the electric motor 10, which is controlled by the control device 9. Basically, the filter 6 is used at a position perpendicular to the irradiation optical axis. However, when sliding by an arbitrary wavelength, the angle of incidence on the filter is controlled.When the irradiated light enters the filter 6 perpendicularly and when it enters the filter 6 at an arbitrary angle, the transmitted wavelength is different, and the angle of incidence changes. When becomes smaller, it slides to the shorter wavelength side.1900nm to 2500n
Since the dominant wavelength of 70 nm generally slides in the near infrared rays of m, the filter 6 is configured to be able to stop at any angle in order to enable measurements in continuous wavelength bands. Note that the main wavelength is approximately the maximum transmission wavelength of the transmitted near-infrared rays.

What is shown in FIG. 8 is a conceptual diagram of another embodiment that performs continuous near-infrared spectroscopy, and uses a spectroscopic element 79 using a diffraction grating.

The irradiated light from the light source is condensed by a condensing lens 80, and a part of the light passes through the sleeve 1-81 and is irradiated onto the light entrance mirror 82. The light reflected by the incident mirror 82 is further reflected by the reflecting mirror 83, and when it enters the seven spectroscopic elements at an arbitrary incident angle α, near-infrared rays in an arbitrary wavelength band separated by the receiving mirror 84 are obtained. Rotate the spectroscopic element 79 and
1900 nm ~ obtained by controlling the incident angle from 3.
If continuous near-infrared rays in the wavelength range of 2500 nm are used in the near-infrared component analyzer 1 as necessary, continuously scanned measurement values can be obtained, and it is also possible to select any wavelength band for measurement. be.

[Effects of the Invention] The advantages of the present invention are as follows. In other words, the chemical quantitative analysis method for determining the content of rice components (
1. Measuring with high precision and in a short time used to be an office job, but the present invention crushes the sample into particles of 50 microns or less, irradiates it with near-infrared rays, and measures the amount of reflected light, the weight of transmitted light, or the reflected light. Because it was possible to calculate the components of rice by calculating the absorbance calculated from the combination of light amount and transmitted light ω and the component conversion coefficient value,
Since the measured values are accurate and can be measured easily and quickly by anyone, time loss such as traditional intuition-based taste predictions and sensory tests for taste evaluation can be eliminated, and it can be used for various next-process operations and rice production. Purchasing can streamline management, etc.

[Brief Description of the Drawings] Fig. 1 is a front sectional view of the taste measuring device, Fig. 2 is an enlarged sectional view of the main parts, Fig. 3 is a perspective view of the main parts, Fig. 4 is a front view of the device, Fig. 5 is a block diagram showing the configuration of the control device, Fig. 6 is an operation flow diagram of the control device, Fig. 7 is a diagram showing the temperature correction value for correcting the measured value of amylose, and Fig. 8 is a diagram showing the near-infrared rays. FIG. 9, which is a conceptual diagram of another embodiment in which continuous spectroscopy is performed, is a characteristic diagram showing the relationship between wavelength and absorbance. DESCRIPTION OF SYMBOLS 1...Near-infrared component analyzer, 2...Cabinet, 3...Slit, 4...Light source, 5...Reflector,
6... Filter, 7... Integrating sphere, 8... Window, 9
A, 9B...Reflected light ■detector, 9C...Transmitted light detector, 10...Electric motor, 11...Measuring section, 12...
- Transparent plate, 13... Sample supply device, 14...-side part, 15... Supply hopper, 16... Opening, 17.
...Shutter, 1B...TAm stone, 19...Level meter, 20.21...Roller, 22.23...Roller for fine powder, 24...Crushing chamber, 25A-25D...
- Cleaning device, 26... Sorting device, 27... Coarse particle discharge port, 28... Photographing frame, 29... Leaf spring, 3
0... Porous template, 31... Side surface, 32... Electromagnet, 33... Sample container, 34... Sample container moving body, 3
5... Container holder, 36... Guide groove, 37... Rack, 38... Orbit axis, 3...-side part, 40...
Rotation handle, 41...Other side part, 42...Bearing stand, 43...Band, 44...Fully point stand, 45...Motor, 46...Gear, 47...Motor One unit, 48.
...Electromagnets, 4...Rotating rollers, 50...Filling part position sensor, 51...Measuring part position sensor, 52
... Injection nozzle, 53... Whistle, 54.54B...
・Cleaning device, 55... Display device, 55A to 55D...
Display device, 56...Push button for operation, 56A...Manual operation button, 56B...Automatic operation button, 56C...
- Transmitted light amount measurement selection button, 56D... Reflection/transmission combination selection button, 57... External supply unit, 58... Printer, 59... Control device, 60... Arithmetic device, 6
1... Storage device, 62... Signal processing device, 63...
・Electric motor, 64...Keyboard, 65...Temperature detector, 66...Terminal, 67...Crimp part, 68-76・
... Drive device, 77 ... Temperature regulator, 78 ... Temperature detector, 79 ... Spectroscopic element, 80 Kawashinu lens, 81
... Slit, 82 ... Light receiving mirror, 83 ... Anti-04 LM, 84 ... Light receiving mirror.

Claims (1)

[Claims] The amount of reflected light, the amount of transmitted light, or the amount of reflected light and the amount of transmitted light obtained by pulverizing the sample for measuring the content of the main components of rice into particles of 50 microns or less and irradiating the pulverized sample with near-infrared light. The rice is characterized in that the components of the rice are calculated by calculating the absorbance calculated by a combination of the above and the component conversion coefficient value set for each of the major components based on the component measurement values measured by a chemical quantitative analysis method or the like. Component content measurement method.