CN113671113A - Inspection method of corn starch spots - Google Patents
Inspection method of corn starch spots Download PDFInfo
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- CN113671113A CN113671113A CN202010405446.8A CN202010405446A CN113671113A CN 113671113 A CN113671113 A CN 113671113A CN 202010405446 A CN202010405446 A CN 202010405446A CN 113671113 A CN113671113 A CN 113671113A
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- spots
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- corn starch
- inspecting
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- 238000000034 method Methods 0.000 title claims abstract description 29
- 229920002261 Corn starch Polymers 0.000 title claims abstract description 15
- 239000008120 corn starch Substances 0.000 title claims abstract description 15
- 238000007689 inspection Methods 0.000 title abstract description 3
- 238000005303 weighing Methods 0.000 claims abstract description 13
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 21
- 239000012153 distilled water Substances 0.000 claims description 15
- 238000003756 stirring Methods 0.000 claims description 4
- 238000004090 dissolution Methods 0.000 claims 1
- 238000001514 detection method Methods 0.000 abstract description 18
- 229920002472 Starch Polymers 0.000 abstract description 16
- 239000008107 starch Substances 0.000 abstract description 16
- 235000019698 starch Nutrition 0.000 abstract description 15
- 239000007795 chemical reaction product Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 235000013305 food Nutrition 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 238000010561 standard procedure Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004438 eyesight Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0091—Powders
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W90/00—Enabling technologies or technologies with a potential or indirect contribution to greenhouse gas [GHG] emissions mitigation
- Y02W90/10—Bio-packaging, e.g. packing containers made from renewable resources or bio-plastics
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- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Food Science & Technology (AREA)
- Medicinal Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The invention discloses a method for inspecting corn starch spots, which comprises the steps of sample pretreatment, sample weighing, sample transferring, dissolving, standing, counting and result counting. Compared with the national standard, the inspection method of the corn starch spots has the advantages that the spots in the starch are easier to observe and count, and the detection result is more accurate.
Description
Technical Field
The invention relates to the technical field of starch detection, in particular to a method for detecting corn starch spots.
Background
For a long time, in the national standard for spot detection (GB/T22427.4-starch spot determination), it has been required to distribute 10 g of starch uniformly on a flat plate, then to cover the transparent plate on the uniformly distributed sample, after gentle flattening, to hold the eye and the transparent plate under good light for 30 cm, to visually observe the spots in the sample and to count them, to calculate the total number of samples in 10 spaces and then to calculate the number of spots per square cm. Is the national standard detection method of the whole spot. The detection result can meet the requirements of general users. However, for the paper industry of manufacturing high-end paper and customers who directly use starch for food, the amount of the spots can affect the quality of the paper (for example, the spots on white printing paper are increased, or the spots on paper cups for holding food are more), and the spots on the manufactured food are more, which can directly cause the corresponding product to be unqualified. In this case, in order to ensure that the quality of the starch specks meets the requirements of the customers, the detection of the specks should be improved so that the detection result reflects the actual presence of specks in the starch.
Disclosure of Invention
The invention provides a method for inspecting corn starch spots in order to make up for the defects of the prior art.
The invention is realized by the following technical scheme:
a method for inspecting corn starch spots comprises the following steps:
s1: sample pretreatment, namely uniformly mixing samples to be detected;
s2: weighing a sample, and weighing m grams of the sample;
s3: transferring the sample, and transferring the weighed sample into a transparent container;
s4: dissolving, namely adding water for dissolving;
s5: standing for Y minutes, wherein Y is more than or equal to 5;
s6: counting, under good light, counting the total number n of the spots sinking into the bottom of the transparent container
S7: the result was calculated, and the total number of spots X per 10 g of the sample was calculated.
The step S2 weighs the sample using an electronic balance accurate to 0.01 gram.
The transparent container in the step S3 is a beaker or a triangular flask.
The step S4 of adding water to dissolve the sample is to measure 10 times of volume or mass of distilled water of the sample by using a measuring cylinder, pour the distilled water into a transparent container with the sample, and stir the mixture evenly.
In step S5, Y is 5.
A specific calculation formula for calculating the total number X of spots per 10 g of sample in step S7 is that X is n/m × 10, and X is an integer.
And if the X is less than or equal to 20, the result is qualified, otherwise, the result is unqualified.
And m is 10.
The present invention has the following advantageous technical effects.
1. The spots in the detection method are deposited at the bottom of a beaker or a triangular flask, and the detection method is more obvious than the national standard method and can more intuitively judge whether the requirements of customers are met.
2. The method is simple and easy to implement. The detection result can not cause deviation because of the different eyesight of personnel, and the degree of accuracy is high.
Detailed Description
When high-end products such as coated paper, disposable paper cups and the like are manufactured, the quality requirement on the used starch is high, and particularly, the spot index of the starch directly influences the appearance quality of the products, so that the requirement on spots in the starch is high. The number of spots is less than or equal to 0.7/cm according to the national standard2In order to meet the demand of starch products supplied to paper-making enterprises, the quality feedback of finished paper is influenced by feeding back too many starch spots for many times in the using process of the paper-making enterprises, and the following new method is developed in order to improve the detection accuracy.
Sample pretreatment: the sample to be tested is mixed uniformly.
Weighing a sample: weighing by using an electronic balance accurate to 0.01 g, placing weighing paper, and weighing m g of sample;
sample transferring: transferring the weighed sample into a beaker or a triangular flask;
adding water for dissolving: measuring 10 times of volume or mass of distilled water of a sample by using a measuring cylinder, pouring the distilled water into a beaker or a triangular flask containing the sample, and uniformly stirring by using a glass rod;
standing: standing for Y minutes; y is more than or equal to 5
Counting: under a better light, counting the total number n of the spots sinking into the bottom of the beaker, wherein n is an integer;
and (3) calculating the result: the total number of spots per 10 g of sample, X, n/m × 10, is calculated, and X is an integer.
The repeatability requirement is as follows: the absolute difference of the results of the three parallel tests should not exceed 2.0
The following is a specific embodiment of the present invention, and the specific steps are as follows:
sample pretreatment: uniformly mixing samples to be detected; placing the sample to be uniformly mixed on a clean rubber blanket or an oilcloth, lifting the opposite angle of the oilcloth, and rolling the sample in the oilcloth back and forth. The diagonal of the tarpaulin was exchanged 1 time per 1 tumbling. The samples can be fully and uniformly mixed after 5-6 times of rolling.
Weighing a sample: weighing the sample by an electronic balance accurate to 0.01 g, placing weighing paper, and weighing 10 g of the sample;
sample transferring: transferring the weighed 10 g sample into a beaker or a triangular flask with the measuring range of 250 ml;
adding water for dissolving: measuring 100ml of distilled water by using a measuring cylinder with the measuring range of 100ml, pouring the distilled water into a 250ml beaker or a triangular flask filled with a sample, and uniformly stirring by using a glass rod;
standing: standing for 5 minutes; it can also be left to stand for a longer time.
Counting: under good light, the total number of spots sinking into the bottom of the beaker is counted;
and (3) calculating the result: the number of spots per 10 grams of sample was calculated.
The repeatability requirement is as follows: the absolute difference of the results of the three parallel tests should not exceed 2.0
And (3) selecting 13 groups of samples to carry out detection according to the steps, and simultaneously carrying out national standard method detection, wherein the results of the two methods and the use effect of the user carry out standard matching experiments, and the results are shown in table 1. The 13-minute samples are all used by high-end products such as coated paper and disposable paper cups manufactured by users, and the using effect of the users is a feedback result of the users in the actual using process.
TABLE 1 comparison of the results
TABLE 1 comparison of experimental results table (continuation)
As can be seen from the above detected data of the standard, the spots specified by the national standard are 0.2-0.7 spots/cm2Compared with the method of the invention, the starch in the qualified standard range has very different detection results. The detection results of different samples (such as sample 5 and sample 6) with the same national standard detection result are very different by using the method of the invention, and the actual use effect is also different. This is because the fine spots in the starch are not detected by national standards, but the spots can be detected by the method of the present invention by naked eyes and counting the number of the spots because the spots sink to the bottom. Similarly, the spots were detected to be 0 spots/cm by the national standard method2The detection results of different starch samples by the method of the invention are also different; although most of the spots meet the requirement, as in sample 10, when the method of the present invention is used for detection, the spots which sink into the bottom of the beaker are small like dust, and a plurality of small spots are gathered together, and the number of the spots cannot be clearly counted because the small spots are too large, so that the paper making enterprises do not meet the requirement when the paper making enterprises use the method. Therefore, the result of using the national standard to detect the spots can not meet the requirement of manufacturing high-end products, and the result of using the method to detect the spots can meet the requirement of manufacturing high-end products as long as the result is within a qualified range. Therefore, the method of the invention can reflect the actual condition of the number of the spots in the starch. As can be seen from the above experimental results, the result is qualified when the total number of spots detected by the method of the present invention per 10 g of samples is less than or equal to 20, otherwise the result is not qualified.
In the above embodiment, the weighed sample mass may not be 10 g, or may be 3 g, 5 g, 7 g, or other gram numbers; the amount of distilled water to be taken out may be other than 100ml as long as it satisfies 10:1 with the weighed sample mass (the density of distilled water is 1g/ml by default). For example, 30ml of distilled water is measured when 3 g of the sample is weighed, 70ml of distilled water is measured when 7 g of the sample is weighed, and 120ml of distilled water is measured when 12 g of the sample is weighed; but the calculation should be converted to the number of spots per 10 grams of sample by the following formula:
x is n/m multiplied by 10, X is an integer,
wherein n is the actual total number of the spots;
m is the actual sample mass;
x is the number of spots per 10 grams of sample.
The capacity of the beaker or flask is then selected according to the total mass or volume of the sample and distilled water.
The standing time is not less than 5 minutes, so that spots are fully precipitated to ensure the accuracy of results; namely, the standing time is more than or equal to 5 minutes.
Claims (8)
1. A method for inspecting corn starch spots is characterized by comprising the following steps:
s1: sample pretreatment, namely uniformly mixing samples to be detected;
s2: weighing a sample, and weighing m grams of the sample;
s3: transferring the sample, and transferring the weighed sample into a transparent container;
s4: dissolving, namely adding water for dissolving;
s5: standing for Y minutes, wherein Y is more than or equal to 5;
s6: counting, namely counting the total number n of the spots sinking into the bottom of the transparent container under good light;
s7: the result was calculated, and the total number of spots X per 10 g of the sample was calculated.
2. The method of inspecting corn starch spots as set forth in claim 1, wherein: the step S2 weighs the sample using an electronic balance accurate to 0.01 gram.
3. The method of inspecting corn starch spots as set forth in claim 1, wherein: the transparent container in the step S3 is a beaker or a triangular flask.
4. The method of inspecting corn starch spots as set forth in claim 1, wherein: the step S4 of adding water for dissolution is to measure 10 times of volume or mass of distilled water of the sample by using a measuring cylinder, pour the distilled water into a transparent container with the sample, and stir the distilled water uniformly.
5. The method of inspecting corn starch spots as set forth in claim 1, wherein: y =5 in step S5.
6. The method of inspecting corn starch spots as set forth in claim 1, wherein: the specific calculation formula for calculating the total number X of spots per 10 g of sample in step S7 is X = n/m × 10, where X is an integer.
7. The method of inspecting corn starch spots as set forth in claim 1, wherein: and if the X is less than or equal to 20, the result is qualified, otherwise, the result is unqualified.
8. The method of inspecting corn starch spots as set forth in claim 1, wherein: the m = 10.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405446.8A CN113671113B (en) | 2020-05-14 | 2020-05-14 | Corn starch spot inspection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010405446.8A CN113671113B (en) | 2020-05-14 | 2020-05-14 | Corn starch spot inspection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113671113A true CN113671113A (en) | 2021-11-19 |
| CN113671113B CN113671113B (en) | 2024-02-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010405446.8A Active CN113671113B (en) | 2020-05-14 | 2020-05-14 | Corn starch spot inspection method |
Country Status (1)
| Country | Link |
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| CN (1) | CN113671113B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486872A (en) * | 2022-01-27 | 2022-05-13 | 巨进科 | Semi-quantitative detection method for ascorbic acid in wheat flour and application thereof |
Citations (2)
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| US20050009199A1 (en) * | 2003-07-07 | 2005-01-13 | Shimadzu Corporation | Method of measuring number of molecules or molecular density of a sample fixed on a substrate surface |
| CN110927286A (en) * | 2019-12-16 | 2020-03-27 | 浙江尖峰健康科技有限公司 | Doping identification and content detection method for lycium barbarum polysaccharide |
-
2020
- 2020-05-14 CN CN202010405446.8A patent/CN113671113B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20050009199A1 (en) * | 2003-07-07 | 2005-01-13 | Shimadzu Corporation | Method of measuring number of molecules or molecular density of a sample fixed on a substrate surface |
| CN110927286A (en) * | 2019-12-16 | 2020-03-27 | 浙江尖峰健康科技有限公司 | Doping identification and content detection method for lycium barbarum polysaccharide |
Non-Patent Citations (4)
| Title |
|---|
| 李孝柏;赵英杰;杨玉华;孙国强;丛伟民;: "玉米淀粉斑点的产生原因及解决办法", 粮食与饲料工业, no. 09, 15 September 2011 (2011-09-15) * |
| 胡丽君;: "马铃薯淀粉质量检测技术研究", 蔬菜, no. 04, 15 April 2015 (2015-04-15) * |
| 陈展册;杜智欣;高佳;刘军义;罗兆飞: "显微镜与实时荧光PCR检测方法在马蹄淀粉鉴定中的应用", 食品工业科技, no. 020, 31 December 2016 (2016-12-31) * |
| 鲍大权;袁建斌;张桢琦: "玉米淀粉斑点指标过高原因分析", 农业机械, no. 008, 31 December 2011 (2011-12-31) * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114486872A (en) * | 2022-01-27 | 2022-05-13 | 巨进科 | Semi-quantitative detection method for ascorbic acid in wheat flour and application thereof |
| CN114486872B (en) * | 2022-01-27 | 2024-01-19 | 巨进科 | Semi-quantitative detection method and application of ascorbic acid in wheat flour |
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| Publication number | Publication date |
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| CN113671113B (en) | 2024-02-23 |
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