CN104749220A - Corn starch acidity rapid detection method - Google Patents
Corn starch acidity rapid detection method Download PDFInfo
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- CN104749220A CN104749220A CN201310744709.8A CN201310744709A CN104749220A CN 104749220 A CN104749220 A CN 104749220A CN 201310744709 A CN201310744709 A CN 201310744709A CN 104749220 A CN104749220 A CN 104749220A
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Abstract
The invention provides a detection method for rapid assessment of acidity index by pH index detection to achieve the purpose of rapid screening of corn starch quality by rapid assessment of acidity value range by pH, and the method is a fast and efficient detection method, the method solves the defects of unsuitability for center control and the like for the reason that corn starch acidity detection steps are tedious, the test period is long, and the titration process end point judgment is affected by human factors. Through the experiment development and research, the method can greatly shorten the testing period, and is convenient to operate and suitable for center control of large-scale continuous production.
Description
Technical field
The present invention relates to a kind of quick check and evaluation method of cornstarch acidity, belong to starch product technical field of quality detection.
Background technology
Starch is the carbohydrates that plant is formed through photosynthesis.The polysaccharide that it is made up of the sugar unit of single type, relies on the natural synthesis of plant.Starch is present in the seed of plant, stem tuber and root in a large number.Cornstarch is topmost kind in starch, accounts for 80% of world's starch total amount.Cornstarch is the primary products of corn processing, not only can directly use, the raw material of industry important especially, be widely used in the industries such as food, sugaring, fermentation, medicine, papermaking, chemical industry, starch sugar (containing glucose syrup, malt syrup, containing the HFCS of 42% fructose with containing the high fructose syrup of 55% fructose, and medical crystal glucose etc.) be the maximum series products of cornstarch deep processing output.At present, starch sugar, no matter from health care, practicality or cost aspect, all has very large competitive power compared with other similar products.From the industrial structure of cornstarch, current domestic cornstarch has over half for the production of starch sugar, remaining cornstarch respectively accounts for 8% for the production of beer and papermaking, food processing, converted starch, medicine are produced and are respectively accounted for 7%, the end product that can extend from these downstream industries is just more diversified, summary is got up, maximum with industry accountings such as beverage, dairy products, food, candy, beer, papermaking and weavings.Therefore these industries development in recent years, can reflect cornstarch industrial expansion track from a side.
At present, cornstarch quality inspection is according to GB/T8885-2008, acidity wherein, as the important source material acceptance index that glucose industryization is produced, adopt GB/T8885-2008 reference to standard to carry out Product Acceptance Review and there are problems, as sense cycle is long, affect greatly by personnel's subjective factor, be not easy to middle control and instruct.
Summary of the invention
The present invention is directed to the deficiencies in the prior art, a kind of cornstarch acidity method for quick is provided.
Technical scheme of the present invention is as follows:
A kind of cornstarch acidity method for quick, comprises the steps:
(1) sample liquid preparation: the cornstarch to be measured taking 1 weight portion, what add 8 weight portions removes CO
2water, by magnetic stirrer, does not splash for easily to form micro cyclone, sample liquid, obtained starch slurry to be measured;
(2) pH value detects: the to be measured starch slurry magnetic stirrer obtained by step (1), under forming little vorticity, is inserted by the electrode of pH meter in starch slurry to be measured, reading when pH meter stable reading is in ± 0.02 scope, record pH value;
(3) result judges: step (2) resulting ph result, by looking into subordinate list 1, determines corresponding Acidity Range, assessment starch quality (invention process mass data obtains the relation curve of pH value and acidity as Fig. 1).
subordinate list 1
| PH before titration | Acidity | Conclusion |
| pH＞6.6 | ＜1.05 0T | Qualified |
| 6.0＜pH＜6.6 | 1.35 0T -1.05 0T | Qualified |
| 5.0＜pH＜6.0 | 1.80 0T - 1.35 0T | Qualified |
| 4.5＜pH＜5.0 | Uncertain region | Judge with president's method |
| pH＜4.5 | ＞1.80 0T | Defective |
Preferred according to the present invention, in described step (1), 1 weight portion is 5g.
Preferred according to the present invention, in described step (1), taking precision is ± 0.001g.
Preferred according to the present invention, in described step (2), pH meter is adopted and is corrected with the following method:
Under 20 ~ 25 DEG C of environment, correct pH meter, make calibration slopes reach 95 ~ 105% with pH=4.00, pH=6.86 and pH=9.18 standard solution, verify with pH=6.86 correcting fluid after correcting, measurement error is in ± 0.05 scope.
Preferred according to the present invention, in described step (2), when pH meter reading is unstable, add saturated potassium chloride solution, addition is 1.Adding of saturated potassium chloride solution can not change pH value.
beneficial effect
1. the present invention adopts pH value method to assess cornstarch acidity index, only use electronic balance and acidometer, sample Direct Sampling weighs, more existing detection means, without the need to drying process, reduce the testing costs such as drying equipment is quoted, the power consumption of equipment use process, reagent;
2. the present invention adopts pH value method to assess cornstarch acidity index, in the conventional titration method of solution, and the result error caused because of personnel's collimation error and detection method complex steps, the drawback that sense cycle is long, work efficiency increases;
3. the present invention adopts pH value method to assess cornstarch acidity index, and sense cycle is only 10 minutes, and compared with classic method, method is more convenient, is more conducive to control in suitability for industrialized production.
Accompanying drawing explanation
Fig. 1 is pH value-acidity linear relationship scatter diagram that invention process mass data obtains;
Fig. 2 is that embodiment 1 obtains correlation metric and determines figure;
Fig. 3 is the linear relationship scatter diagram detecting its acidity under embodiment 1 obtains cornstarch butt and wet basis condition respectively;
Fig. 4 detects its acidity differential analysis broken line graph under embodiment 1 obtains cornstarch butt and wet basis condition;
Fig. 5 is that embodiment 2 obtains pH value linear relationship scatter diagram before Shandong HuaYi Corn Technology Co., Ltd.'s cornstarch acidity and its titration;
Fig. 6 is that embodiment 3 obtains pH value linear relationship scatter diagram before De Neng bio tech ltd, Shandong cornstarch acidity and its titration.
Embodiment
Below in conjunction with embodiment, technical scheme of the present invention is described further, but institute of the present invention protection domain is not limited thereto.
embodiment 1
pH value-acidity linear relationship scatters the acquisition of relation
Same cornstarch detects its acidity respectively under butt and wet basis condition, both checkings correlativity and result error, according to following operation steps:
1. equipment calibration
Under 20 ~ 25 DEG C of environment, with pH=4.00, pH=6.86 and pH=9.18 standard solution acidity correction meter, make calibration slopes reach 95 ~ 105%, verify with pH=6.86 correcting fluid after correcting, measurement error should within ± 0.05.
2. sample liquid preparation
Accurately take cornstarch 5.0g(± 0.001g), be placed in 100ml beaker, add 40ml and remove CO
2water, by magnetic stirrer, do not splash for easily to form micro cyclone, sample liquid, obtained liquid to be measured is for subsequent use.
3. detect
Add magnetic stir bar in liquid to be measured, be placed on stirrer and at the uniform velocity stir, do not splash for easily to form micro cyclone, sample liquid, correctly insert pH electrode, treat pH meter stable reading reading in ± 0.02 scope.
Test likely still can not balance within a certain period of time, can add a saturated potassium chloride solution and promote balance.
To pH before acidity under same cornstarch survey butt and wet basis condition and titration, as shown in Figure 3, Figure 4, wet basis pH and the linear positive correlation of butt acidity, the mean value of acidity difference is 0.1 to testing result
0t, and wet basis acidity value is lower slightly.
Through repeated detection, as shown in Figure 1, obtain the relation curve of pH value and acidity, formula is as follows for result
(Fig. 1 is invention process mass data statistical study conclusion figure, " summary of the invention part has been done to supplement, as formula; I not thinks that it be easy for embodying formula, because acidity and PH have certain relation, but because not including sour power not etc.; cannot equivalence conversion, and the present invention is equivalent to qualitative judgement):
Cornstarch acidity value is organic acid and mineral acid total amount measured value in starch, strong acid ionizes completely, weak acid is partial ionization, so same volume will much larger than strong acid (comparing with first acid) with the substance withdrawl syndrome of weak acid during pH value, pH value refers to the pH having ionized out, and acidity sees acid-base neutralization ability, the two has certain contact, but because of acid contained in starch power not etc., of equal value conversion cannot be done, can only qualitatively judge according to negative correlation, for
4.5 < pH < 5.0time in scope, relative acid angle value is in 1.80
0t critical part, due to organic acid in starch between different batches and mineral acid content difference, the strong and weak difference of acid, causes the uncertainty of acidity result, therefore suggestion is with the accordance of president's method check and evaluation acidity index
Choose different manufacturers cornstarch, respectively pH value and sample acidity before detection titration, the reliability and feasibility of checking invention conclusion.
According to operation steps in example 1, adopted corn Science and Technology Ltd. to China and De Neng bio tech ltd, Shandong cornstarch mass detection respectively, testing result, as Fig. 5, Fig. 6 display, confirms the reliability of technical solution of the present invention, feasibility.
embodiment 2
pH value and the acidity corresponding relation of Shandong HuaYi Corn Technology Co., Ltd.'s production cornstarch confirm
Cornstarch to be measured is purchased from Shandong HuaYi Corn Technology Co., Ltd., and diagram is designated as 1# producer.
A kind of cornstarch acidity method for quick, comprises the steps:
(1) take different batches China to be measured adopted cornstarch sample each 5g, what add 40ml respectively removes CO
2water, by magnetic stirrer, does not splash for easily to form micro cyclone, sample liquid, obtained starch slurry to be measured;
(2) starch slurry to be measured step (1) obtained is under stirring, and insert in starch slurry to be measured by the pH electrode of pH meter, reading when pH meter stable reading is in ± 0.02 scope, records pH value respectively; Detect its acidity value with batch sample by GB/T 8885-2008, and record acidity value;
(3) adopt these pH-acidity data of step (2) gained to set up vertical scatter diagram, by analysis, conform to invention result of study, that is: during pH > 6.6, acidity < 1.05
0t; During 6.0 < pH < 6.6, acidity is between 1.35
0t-1.05
0between T; During 5.0 < pH < 6.0, acidity is between 1.80
0t-1.35
0t; During pH < 4.5, acidity > 1.80
0t.
Preferred according to the present invention, in described step (1), taking precision is ± 0.001g.
Preferred according to the present invention, in described step (2), pH meter is adopted and is corrected with the following method:
Under 20 ~ 25 DEG C of environment, correct pH meter, make calibration slopes reach 95 ~ 105% with pH=4.00, pH=6.86 and pH=9.18 standard solution, verify with pH=6.86 correcting fluid after correcting, measurement error is in ± 0.05 scope.
Preferred according to the present invention, in described step (2), when pH meter reading is unstable, add saturated potassium chloride solution, addition is that every 5g cornstarch to be measured adds one.
detect pH value by the inventive method, detect its acidity value compare of analysis with GB/T 8885-2008 standard method, confirm that result judges consistent with table 1.
Comparing embodiment 2 and GB/T 8885-2008 detect and are detecting ageing analysis: adopt this inventive method single sample to detect 10 minutes consuming time, adopt GB/T 8885-2008 method single sample to detect 4 hours consuming time, embody ageing advantage of the present invention.
embodiment 3
pH value and the acidity corresponding relation of De Neng bio tech ltd, Shandong production cornstarch confirm
Cornstarch to be measured is purchased from De Neng bio tech ltd, Shandong, diagram is designated as 2# producer, method of operating step is with embodiment 2, gained pH-acidity data set up vertical scatter diagram, by analysis, still conform to invention result of study, namely as can be seen from scatter diagram intuitively: during pH > 6.6, acidity < 1.05
0t; During 6.0 < pH < 6.6, acidity is between 1.35
0t-1.05
0between T; During 5.0 < pH < 6.0, acidity is between 1.80
0t-1.35
0t; During pH < 4.5, acidity > 1.80
0t.
embodiment 4
Three batches of cornstarch to be measured are purchased from Shandong Longli Biology Science and Technology Co., Ltd, and method of operating step, with embodiment 2, records pH value by the inventive method and adopts acidity data statistic analysis measured by GB/T8885-2008 method as follows:
embodiment 5
Three batches of cornstarch to be measured are purchased from Shandong Zhonggu Starch Sugar Co., Ltd., and method of operating step, with embodiment 2, records pH value by the inventive method and adopts acidity data statistic analysis measured by GB/T8885-2008 method as follows:
Embodiment 4 and embodiment 5 verify that conclusion is determined, the reliability of summary of the invention.
Claims (2)
1. a cornstarch acidity method for quick, is characterized in that comprising the steps:
(1) sample liquid preparation: the cornstarch to be measured taking 1 weight portion, what add 8 weight portions removes CO
2water, by magnetic stirrer, does not splash for easily to form micro cyclone, sample liquid, obtained starch slurry to be measured;
(2) pH value detects: the to be measured starch slurry magnetic stirrer obtained by step (1), under forming little vorticity, is inserted by the electrode of pH meter in starch slurry to be measured, reading when pH meter stable reading is in ± 0.02 scope, record pH value;
(3) result judges: step (2) resulting ph result, by looking into subordinate list 1, determines corresponding Acidity Range, assessment starch quality.
2. a kind of cornstarch acidity method for quick according to claim 1, it is characterized in that in described step (2), pH meter is adopted and is corrected with the following method: under 20 ~ 25 DEG C of environment, pH meter is corrected with pH=4.00, pH=6.86 and pH=9.18 standard solution, calibration slopes is made to reach 95 ~ 105%, verify with pH=6.86 correcting fluid after correcting, measurement error is in ± 0.05 scope; When pH meter reading is unstable, add saturated potassium chloride solution, addition is 1, and adding of saturated potassium chloride solution can not change pH value.
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| CN201310744709.8A CN104749220A (en) | 2013-12-28 | 2013-12-28 | Corn starch acidity rapid detection method |
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| CN201310744709.8A CN104749220A (en) | 2013-12-28 | 2013-12-28 | Corn starch acidity rapid detection method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353460A (en) * | 2016-09-18 | 2017-01-25 | 国网福建省电力有限公司 | Device and method for intelligently and quickly measuring acid values of main transformer insulation paper |
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2013
- 2013-12-28 CN CN201310744709.8A patent/CN104749220A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106353460A (en) * | 2016-09-18 | 2017-01-25 | 国网福建省电力有限公司 | Device and method for intelligently and quickly measuring acid values of main transformer insulation paper |
| CN106353460B (en) * | 2016-09-18 | 2018-12-11 | 国网福建省电力有限公司 | Acid value intelligence rapid determination device and method in a kind of main change insulated paper |
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