Device for rapidly screening fatty acid value of unhulled rice

Abstract

The utility model relates to a device for quickly screening the fatty acid value of unhulled rice, which comprises a moisture balance system, an extraction system, a liquid adding control system and an auxiliary colorimetric system, the moisture balance system consists of an upper sleeve barrel, a sample loading cup, a fan and a pipeline which are vertically communicated from top to bottom; the upper sleeve barrel is filled with a water balance agent, the large opening end of the upper sleeve barrel is open, and the small opening end of the upper sleeve barrel is sealed by a mesh screen with screen holes ranging from 120 meshes to 180 meshes; the sample containing cup is made of cellulose paper with the maximum hole not larger than 30 micrometers and used for containing grain powder samples, the periphery of a cup opening of the sample containing cup is erected on an upper opening of the pipeline, and a cup body of the sample containing cup is arranged in the pipeline in a sleeved mode. The device is used for rapidly screening the fatty acid value of rice, simplifies the determination process of the fatty acid value of grains, is simple to operate and reliable in result, and greatly shortens the analysis time.

Description

Technical Field

[0001] The utility model provides a device for rapid screening of fatty acid value of paddy rice, belonging to the field of grain inspection. Background Technique

[0002] The fatty acid value of grain is an important index of grain quality and a necessary inspection item when paddy rice is purchased, stored in the warehouse and taken out of the warehouse. The existing method for determining the fatty acid value of paddy rice is based on the standard method in Appendix A of "Rules for Judging the Storage Quality of Paddy Rice" (GB / T 20569-2006) and the instrument determination method developed according to its principle. Although it can accurately determine the fatty acid value of paddy rice, there are problems such as long determination time, expensive instrument and equipment, relatively complex operation, difficult judgment of titration end point, and high requirements for the operation skills of testers. Specifically, first, both methods use an oven to determine the moisture of the sample and calculate the dry basis of the sample, resulting in 6 to 7 hours required to complete the determination of the fatty acid value, and its timeliness cannot adapt to the progress of grain purchase; second, during the operation of the standard method, the use of a micro burette requires certain operation skills, and the sample solution used for titration is an emulsion, and the titration end point phenomenon is not obvious and difficult to judge, and testers need to practice repeatedly to accurately master it; third, although the fatty acid value analyzer can replace the manual operation in the standard method, the instrument is large in volume, not easy to move and expensive.

[0003] During the paddy rice purchase period, the demand for fatty acid value detection is large, and the problem of long fatty acid value detection time needs to be solved urgently. At the same time, compared with the specific value of the fatty acid value, grain operators are more concerned about whether this value exceeds the quality control value set for it. Summary of the Invention

[0004] In view of this, the purpose of the utility model is to provide a device for rapid screening of fatty acid value of paddy rice. The device for rapid screening of fatty acid value of paddy rice has a simple structure, reasonable design, low production cost, and is convenient and fast to use.

[0005] The device for rapid screening of fatty acid value of paddy rice of the utility model is characterized in that:

[0006] It includes a moisture balance system, and the moisture balance system is composed of an upper sleeve barrel, a sample loading cup, a fan and a pipeline which are vertically connected from top to bottom; the upper sleeve barrel is filled with a moisture balance agent, the large mouth end of the upper sleeve barrel is open, and the small mouth end is sealed with a mesh screen with a mesh size between 120 and 180 meshes; the sample loading cup is made of cellulose paper with a maximum pore size not exceeding 30um and is used to hold the grain powder sample. The peripheral edge of the cup mouth of the sample loading cup is placed on the upper mouth of the pipeline (104), and the cup body of the sample loading cup is sleeved inside the pipeline body; the fan is fixed in the pipeline and is located below the sample loading cup; that is, the upper end of the pipeline is provided with a sample loading cup, the fan is fixed inside the body, and the lower end is open to facilitate the passage of air flow.

[0007] Preferably, the upper barrel is in the shape of a conical barrel.

[0008] Preferably, the above-mentioned device further includes an extraction system and a liquid addition control system.

[0009] Preferably, the above-mentioned extraction system includes a vortex oscillator, a centrifuge tube, and a filter paper barrel that can be placed in the centrifuge tube.

[0010] Preferably, the above-mentioned liquid addition control system includes a pipette, an Erlenmeyer flask, a chromogenic reagent, and a balance. The chromogenic reagent is loaded in the Erlenmeyer flask and placed on the balance. The pipette is located above the Erlenmeyer flask and loaded with an alkali solution.

[0011] The working method of the device for rapid screening of the fatty acid value of paddy rice of the present utility model is characterized in that: after the grain powder sample rapidly balances moisture in the moisture balance system, the extraction system prepares it into a test solution, and the liquid addition control system quantitatively adds the alkali solution to the test solution by the gravimetric method. The color change of the test solution with the added alkali solution is observed in the auxiliary colorimetric system to judge whether the fatty acid value of the sample exceeds the standard.

[0012] When the moisture balance system works, the fan is started, and the air flow generated in the system passes through the moisture balance agent from top to bottom and is dried. The dried air flow passes through the sample cup filled with sample powder, quickly taking out the moisture of the sample powder. Thus, the moisture content of the sample powder with different initial moisture contents can be quickly balanced to within the range of 7.6% - 8.3% at room temperature, and the median value is 8.1%.

[0013] Preferably, when the above-mentioned liquid addition control system works, according to the characteristic that the density of the used alkali solution is relatively stable under normal temperature and pressure conditions, the density of the 0.01mol / L KOH-ethanol solution is 0.82g / mL, and the gravimetric method is used instead of the volumetric method for the reagent blank value and the quantitative addition of the alkali solution.

[0014] Preferably, the specific working method of the above-mentioned liquid addition control is as follows:

[0015] (1) Add the chromogenic reagent to the blank reagent, weigh it with a balance, then use a pipette to drop the KOH solution until it turns slightly red and does not fade for 30s, and weigh it again with the balance. The difference between the front and back readings of the balance is the blank value, with the unit of gram (g);

[0016] (2) Optimize the fatty acid value calculation formula in GB / T 20569-2006 A.2. The original formula is as follows

[0017]

[0018] Among them, S: the milligrams of potassium hydroxide required to neutralize the free fatty acids in 100g of dry matter sample, with the unit of milligrams per 100 grams (mg / 100g); V 1: Volume of the KOH solution consumed in titrating the sample solution, unit: milliliter (mL); V 0 : Volume of the KOH solution consumed in titrating the blank solution, unit: milliliter (mL); c: Concentration of the KOH solution, unit: mole per liter (mol / L); 56.1: Molecular weight of potassium hydroxide, unit: gram per mole (g / mol); V a : Volume of absolute ethanol used for sample extraction, unit: milliliter (mL); V b : Volume of the sample extraction solution used for titration, unit: milliliter (mL); 100: Mass converted to 100 g of dry sample, unit: gram (g); m: Mass of the sample, unit: gram (g); ω: Moisture mass fraction of the sample, that is, the mass of moisture contained in every 100 g of the sample, unit: gram (g).

[0019] According to volume equals mass divided by density, use m 1 / 0.82 to replace V in the formula 1 , m 1 : Added mass of the KOH solution, unit: gram (g); Use m 0 / 0.82 to replace V in the formula 2 , m 0 : Blank value in step (1), unit: gram (g); Use the median value of 8.1% of the sample moisture after moisture balance as ω, the moisture mass fraction of the sample, and substitute it into the formula; Use m 1 as the dependent variable and others as independent variables. The optimized formula is as follows:

[0020]

[0021] Among them, m 1 : Added mass of the KOH solution, unit: gram (g); m 0 : Blank value, unit: gram (g); S: Screening quality control value of grain fatty acid value, unit: milligram per 100 grams (mg / 100g); c: Concentration of the KOH solution, unit: mole per liter (mol / L); V a : Volume of absolute ethanol used for sample extraction, unit: milliliter (mL); V b : Volume of the sample extraction solution used for titration, unit: milliliter (mL); m: Mass of the sample, unit: gram (g); 1.343×10 -4 : Coefficient;

[0022] (3) Add a color-developing reagent to the sample extraction solution. After placing it on the balance and stabilizing, tare it. Use a pipette to add the KOH solution to the added mass m calculated by formula (2) 1 ;

[0023] Preferably, the above auxiliary colorimetric system is a white background light-transmitting plate with an artificial natural scattering light source.

[0024] Preferably, the specific working method includes the following steps:

[0025] (1) Sample moisture balance: Put 10 g of sample powder into the sample loading cup of the moisture balance system, tighten the upper sleeve of the moisture balance agent, start the fan, with an air volume of 12.5 L / s for 10 min;

[0026] (2) Preparation of sample extract: Weigh 8.00 g of the sample powder after moisture balance into a 50 mL centrifuge tube, add 40.00 mL of absolute ethanol, and tighten the tube cap. Place it in a vortex oscillator, oscillate at 2000 r / min for 5 min, let it stand, put the filter paper barrel into the centrifuge tube, allow the liquid to penetrate from the wall of the filter paper barrel into the filter paper barrel, and transfer 20 mL of the extract in the filter paper barrel to a clean Erlenmeyer flask;

[0027] (3) Liquid addition control

[0028] (3.1) Blank value determination: In the Erlenmeyer flask, add 20.00 mL of absolute ethanol, 40 mL of carbon dioxide-free water, and 5 drops of chromogenic reagent, shake well, place it on the balance, wait for the reading to stabilize, press the zero key, take it out, move it in front of the auxiliary colorimetric system, use a pipette to suck a small amount of KOH working solution, and drop it until it turns slightly red and does not fade for 30 s. Place the Erlenmeyer flask on the balance again, wait for the reading to stabilize, which is the blank value.

[0029] (3.2) Calculation of the mass of added alkali solution: According to formula (2) where m = 8 g, V a = 40 mL, V b = 20 mL. Substitute the values into the formula to get:

[0030]

[0031] where, m 1 : The mass of added KOH working solution, unit is gram (g); m 0 : Blank value, unit is gram (g); S: The screening quality control value of grain fatty acid value, unit is milligram per 100 grams (mg / 100 g); c: The concentration of KOH working solution, unit is mole per liter (mol / L); 5.372×10 -4 : Coefficient;

[0032] m 0 is the blank value measured in step (3.1), S and c are known values, substitute them into the calculation to obtain the mass of added KOH working solution m 1 (g);

[0033] (3.3) Quantitative addition of lye by gravimetric method: Add 40 mL of carbon dioxide-free water and 5 drops of chromogenic reagent to a clean conical flask containing the sample extract in step (2), shake well, place it on the balance, tare it after stabilization, and use a pipette to add the KOH solution drop by drop until the balance shows a value of m 1 (g);

[0034] (3.4) Colorimetric screening of fatty acid value: Shake the solution in step (3.3), then add 40 mL of carbon dioxide-free water, move it in front of the auxiliary colorimetric system, observe the color of the solution in the conical flask. If it turns slightly red, the fatty acid value of the sample meets the requirements; if it does not change color, the fatty acid value of the sample does not meet the requirements.

[0035] In view of the problems of the existing methods and combined with the actual needs during the period of paddy rice purchase and storage, first, the present utility model adopts a moisture balance system to quickly pass dry air through the sample powder at room temperature, taking away its excess moisture. Samples with different initial moisture contents can have their moisture balanced to a small range of 7.6% - 8.3% within 10 minutes, and the median value of 8.1% is used as the sample moisture to calculate the sample dry basis, thus greatly shortening the determination time of the fatty acid value; second, starting from the needs of grain operators, the present utility model transforms the detection purpose from the judgment of the titration end point of the fatty acid value to the judgment of whether it exceeds the quality control value, greatly reducing the difficulty of judgment; third, according to the characteristic that the liquid density is relatively stable under normal temperature and pressure conditions, the present utility model uses the gravimetric method of the balance to replace the volumetric method of the burette for the quantitative addition of lye, avoiding the error caused by incorrect use of the burette. The method is simple to operate, the screening result has high accuracy, can well meet the needs of rapid detection of the fatty acid value during paddy rice purchase, and has good practical application effects.

[0036] Therefore, compared with the prior art, the present utility model has the following beneficial effects: (1) The present utility model can quickly balance the sample moisture to the equilibrium point, thereby realizing the rapid calculation of the sample dry basis, without the need to use equipment such as an oven and a high-precision electronic balance, greatly simplifying the operation steps and shortening the detection time; (2) Transforming the detection purpose from the judgment of the titration end point of the fatty acid value to the judgment of whether it exceeds the quality control value, greatly reducing the difficulty of judgment; (3) According to the characteristic that the liquid density is relatively stable, using the gravimetric method of the balance to replace the volumetric method of the burette for the quantitative addition of lye, avoiding the error caused by incorrect use of the burette, and at the same time reducing the use of titration equipment and simplifying the operation method; (4) The auxiliary colorimetric device unifies the environmental lighting conditions for sensory judgment, avoiding the interference of environmental light on sensory judgment. Description of the Drawings

[0037] The following further describes the patent of the present utility model in conjunction with the drawings;

[0038] Figure 1It is a schematic structural diagram of the device for rapid screening of the fatty acid value of paddy rice of the present utility model;

[0039] In the figure: 1 - Moisture balance system; 101 - Upper sleeve barrel; 102 - Sample cup; 103 - Fan; 2 - Extraction system; 201 - Vortex oscillator; 202 - Filter paper barrel; 203 - Centrifuge tube; 3 - Liquid addition control system; 301 - Pipette; 302 - Color - developing reagent; 303 - Balance; 4 - Auxiliary colorimetric system;

[0040] Figure 2 It is a schematic structural diagram of the moisture balance system;

[0041] In the figure: 101 - Upper sleeve barrel filled with moisture balance agent; 101a - Moisture balance agent; 101b - Mesh sieve; 102 - Sample cup; 103 - Fan pipeline; 103a - Fan.

[0042] Figure 3 It is a schematic structural diagram of the liquid addition control system;

[0043] In the figure: 301a - Pipette filled with alkali solution; 302a - Erlenmeyer flask filled with color - developing reagent and blank reagent; 302b - Erlenmeyer flask filled with color - developing reagent and sample extract; 303 - Balance.

[0044] Figure 4 It is a comparison table of the moisture content before and after the moisture balance of the sample. Specific embodiments

[0045] The present utility model will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0046] As Figure 1 shown, a device for rapid screening of the fatty acid value of paddy rice includes a moisture balance system (1), an extraction system (2), a liquid addition control system (3), and an auxiliary colorimetric system (4).

[0047] As Figure 2 shown, in this embodiment, the moisture balance system (1) is composed of an upper sleeve barrel (101), a sample cup (102), a fan (103), and a pipeline (104) which are vertically connected from top to bottom; the upper sleeve barrel (101), the sample cup (102), the fan (103), and the pipeline (104) can be as Figure 1The coaxial arrangement described above may also be such that the pipe (104) is a bent pipe, the fan (103) is arranged inside the pipe (104), the upper sleeve barrel (101) is in the shape of a conical barrel and filled with a moisture balance agent (101a). The large opening end of the upper sleeve barrel (101) is open, and the small opening end is sealed with a mesh sieve (101b) with a mesh size between 120 and 180 meshes. The sample loading cup (102) is made of cellulose paper with a maximum pore size not exceeding 30um and contains 10g of grain powder sample. The peripheral edge of the cup mouth of the sample loading cup (102) is placed on the upper mouth of the pipe (104), and the cup body of the sample loading cup (102) is sleeved inside the pipe (104). The fan (103) is fixed in the pipe (104) and is located below the sample loading cup (102), that is, the upper end of the pipe (104) is provided with the sample loading cup (102), the fan (103) is fixed inside the body, and the lower end is open to facilitate the passage of air flow.

[0048] The small opening end of the upper sleeve barrel (101) can be tightly sleeved at the cup mouth of the sample loading cup (102). Start the fan (103), and the air flow with a volume of 12.5L / s generated in the system passes through the moisture balance agent (101a) from top to bottom and is dried. The dried air flow passes through the sample loading cup (102) containing the sample powder, quickly taking out the moisture of the sample powder. After 10 minutes, the moisture content of the sample powder with different initial moisture contents can be quickly balanced to the range of 7.6% - 8.3% at room temperature, and the median value is 8.1%.

[0049] In this embodiment, the extraction system (2) includes a vortex oscillator (201), a filter paper barrel (202) and a centrifuge tube (203). Weigh 8.00g of the sample powder after moisture balance into a 50mL centrifuge tube (203), add 40.00mL of absolute ethanol, tighten the tube cap, put the centrifuge tube into the vortex oscillator (201), oscillate at a speed of 2000r / min for 5 minutes, let it stand, then put the filter paper barrel (202) into the centrifuge tube, and make the liquid penetrate from the wall of the filter paper barrel into the filter paper barrel. Pipette 20.00mL of the extract in the filter paper barrel into a clean triangular flask.

[0050] As Figure 3 shown, in this embodiment, the liquid addition control system 3 includes a pipette (301a) filled with KOH working solution (0.01mol / L KOH-ethanol working solution), a triangular flask (302a or 302b) filled with a color developing reagent and a blank reagent (or sample extract), and an analytical balance (sensitivity 0.01g) (303). The analytical balance is used for the determination of the blank value and the quantitative addition of the alkaline solution by the gravimetric method.

[0051] Blank value determination: In an Erlenmeyer flask, add 20.00 mL of anhydrous ethanol, 40 mL of carbon dioxide-free water, and 5 drops of the color-developing reagent. Shake well to obtain an Erlenmeyer flask (302a) containing the color-developing reagent and the blank reagent. Place the Erlenmeyer flask (302a) on the balance (303). Wait for the reading to stabilize, press the zero key, take it out, move it in front of the auxiliary colorimetric system (4), and use a pipette (301a) filled with the alkali solution to add the KOH working solution dropwise to the Erlenmeyer flask (302a) until the solution in the Erlenmeyer flask turns slightly red and does not fade for 30 s. Place the Erlenmeyer flask on the balance again. Wait for the reading to stabilize, which is the blank value.

[0052] Through Calculate the added mass m of the KOH working solution 1 After that, quantitative addition of the alkali solution is carried out by the gravimetric method. In an Erlenmeyer flask containing 20.00 mL of the extract obtained through the extraction system (2), add 40 mL of carbon dioxide-free water and 5 drops of the color-developing reagent. Shake well to obtain an Erlenmeyer flask (302b) containing the color-developing reagent and the sample extract. After stabilizing on the balance, tare it. Use a pipette (301a) filled with the alkali solution to add the KOH working solution dropwise to the Erlenmeyer flask (302b) until the balance value is m 1 (g).

[0053] As Figure 1 shown, in this embodiment, the auxiliary colorimetric system (4) is a white background light-transmitting plate with an artificial natural scattering light source, which unifies the environmental lighting conditions for color observation. Shake the solution in the Erlenmeyer flask of the liquid addition control system, then add 40 mL of carbon dioxide-free water, move it in front of the auxiliary colorimetric system (4), and observe the color of the solution in the Erlenmeyer flask. If it turns slightly red, the fatty acid value of the sample meets the requirements; if it does not change color, the fatty acid value of the sample does not meet the requirements.

[0054] This embodiment also provides a detection method for a device for rapid screening of the fatty acid value of paddy rice, including the following steps:

[0055] Step 1: Sample moisture balance: Put 10 g of sample powder into the sample loading cup (102), tighten the upper sleeve barrel (101) containing the moisture balance agent, start the fan (103), and keep the air volume of the air duct at about 12.5 L / s for 10 min;

[0056] Step 2: Preparation of the sample extract: Weigh 8.00 g of the moisture-balanced sample powder with a balance (303) into a 50 mL centrifuge tube (203), add 40.00 mL of anhydrous ethanol, tighten the tube cap, put it into the vortex oscillator (201), and oscillate at 2000 r / min for 5 min. Let it stand. Place the filter paper barrel (202) in the centrifuge tube to allow the liquid to penetrate from the wall of the filter paper barrel into the filter paper barrel, and transfer 20.00 mL of the extract in the filter paper barrel to a clean Erlenmeyer flask.

[0057] Step 3: Liquid addition control

[0058] 1 Blank value determination: Take another clean Erlenmeyer flask, add 20.00 mL of absolute ethanol, 40 mL of carbon dioxide-free water, and 5 drops of color-developing reagent (302), shake well to obtain an Erlenmeyer flask (302a) containing the color-developing reagent and blank reagent. Place it on the balance (303), wait for the reading to stabilize, press the zero key, take it out, move it in front of the auxiliary colorimetric system (4), and use a pipette (301a) filled with alkali solution to add KOH working solution dropwise to the Erlenmeyer flask (302a) until the solution in the flask turns slightly red and does not fade for 30 s. Place the Erlenmeyer flask on the balance again, wait for the reading to stabilize, and it shows 0.32 g. This value is the blank value m 0 ;

[0059] 2 Calculation of the added mass of alkali solution: According to It is known that S (quality control value for screening the fatty acid value of grains) is 18.0 mg / 100 g; c (concentration of KOH working solution) is 0.01000 mol / L; substitute the blank value m 0 = 0.32 g, and the added mass m of the KOH working solution can be calculated by calculation 1 = 1.29 g;

[0060] 3 Quantitative addition of alkali solution by gravimetric method: Take the Erlenmeyer flask containing 20.00 mL of the extraction solution in Step 2, add 40 mL of carbon dioxide-free water and 5 drops of color-developing reagent (302), shake well to obtain an Erlenmeyer flask (302b) containing the color-developing reagent and the sample extraction solution. Place it on the balance and tare it after stabilization. Use a pipette (301a) filled with alkali solution to add KOH working solution dropwise to the Erlenmeyer flask (302b) until the balance value is 1.29 g;

[0061] Step 4: Colorimetric screening of fatty acid value: Shake the solution in 3, then add 40 mL of carbon dioxide-free water, move it in front of the auxiliary colorimetric system, observe the color of the solution in the Erlenmeyer flask. If it turns slightly red, the fatty acid value of the sample meets the requirements; if it does not change color, the fatty acid value of the sample does not meet the requirements.

[0062] In view of the problems of the existing methods and in combination with the actual requirements during the period of paddy rice purchase and storage, first, the utility model adopts a moisture balance system to make dry air quickly pass through the sample powder at room temperature, taking away its excess moisture. The moisture of the sample powder with different initial moisture contents can be balanced to a relatively small range of 7.6% - 8.3% within 10 minutes, and the median value of 8.1% is used as the sample moisture to calculate the dry basis of the sample, thus greatly shortening the determination time of the fatty acid value; second, starting from the needs of grain operators, the utility model transforms the detection purpose from the judgment of the titration end point of the fatty acid value to the judgment of whether it exceeds the quality control value, greatly reducing the difficulty of judgment; third, according to the characteristic that the liquid density is relatively stable under normal temperature and pressure conditions, the utility model uses the balance weighing method instead of the burette volume method to quantitatively add the lye, avoiding the error caused by incorrect use of the burette. The method is easy to operate, the screening result has high accuracy, and it can well meet the requirements of rapid detection of the fatty acid value during paddy rice purchase, and has good practical application effect.

[0063] In the above preferred embodiments, the purpose, technical solution and advantages of the utility model are further described in detail. It should be understood that the above are only the preferred embodiments of the utility model and are not intended to limit the utility model. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the utility model shall be included in the protection scope of the utility model.

Claims

1. A device for rapid screening of fatty acid values ​​in rice, characterized in that: The invention comprises a moisture balance system (1), wherein the moisture balance system (1) comprises an upper barrel (101), a sample cup (102), a fan (103) and a pipeline (104) which are arranged vertically from top to bottom and connected to each other; the upper barrel (101) is filled with a moisture balance agent (101a); the large end of the upper barrel (101) is open, and the small end is sealed with a mesh screen (101b) with meshes between 120 meshes and 180 meshes; the sample cup (102) has a maximum hole of no more than 1 / 4 inch; The invention is made of cellulose paper with a thickness of 30 um and is used for storing grain powder samples. The edge of the mouth of the sample cup (102) is mounted on the upper mouth of the pipeline (104), and the cup body of the sample cup (102) is sleeved in the pipeline (104); the fan (103) is fixed in the pipeline (104) and is located below the sample cup (102); that is, the sample cup (102) is mounted at the upper end of the pipeline (104), the fan (103) is fixed in the body, and the lower end is open to facilitate airflow.

2. A device for rapid screening of rice fatty acid values ​​according to claim 1, characterized in that: The upper barrel (101) is in the shape of a conical barrel.

3. A device for rapid screening of rice fatty acid values ​​according to claim 2, characterized in that: The device also includes an extraction system (2) and a liquid addition control system (3).

4. The device for rapid screening of fatty acid values ​​in rice according to claim 3, characterized in that: The extraction system (2) comprises a vortex oscillator, a centrifuge tube and a filter paper bucket capable of placing the centrifuge tube.

5. The device for rapid screening of fatty acid values ​​in rice according to claim 4, characterized in that: The liquid adding control system comprises a pipette, a triangular flask, a color developing reagent and a balance. The triangular flask is loaded with the color developing reagent and placed on the balance. The pipette is located above the triangular flask and loaded with alkali solution.

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