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Method for testing content of tapioca starch in tapioca and maize mixed starch

A cassava starch and detection method technology, which is applied in the measurement of color/spectral characteristics, material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problem of different starch properties and cannot be quantitatively determined Mixed starch cassava starch content, difficult to use and other issues, to achieve significant correlation, simple experimental operation, accurate test results

Inactive Publication Date: 2014-02-19
甘肃圣大方舟马铃薯变性淀粉有限公司
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Problems solved by technology

However, the performance of the mixed starch is far different from that of pure tapioca starch, causing users to encounter difficulties in use
[0003] At present, there is no feasible method for quantitative detection of the two kinds of starch content in China. The usual method is to observe the morphology of starch granules through high-power optical microscope or electron microscope scanning to identify this kind of mixed phenomenon, but this identification cannot Quantitative Determination of Tapioca Starch Content in Mixed Starches

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  • Method for testing content of tapioca starch in tapioca and maize mixed starch
  • Method for testing content of tapioca starch in tapioca and maize mixed starch
  • Method for testing content of tapioca starch in tapioca and maize mixed starch

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[0028] The present invention will be explained in detail below in conjunction with the embodiments.

[0029] Weigh 35.0 g of potassium iodide, dissolve it in a small amount of deionized water, and add 15.0 g of iodine. After dissolving, dilute with deionized water to make the volume to 1000 mL to obtain an iodine-potassium iodide indicator. Weigh 5 portions of cassava-corn mixed starch 1.0g each in a 150mL Erlenmeyer flask, add 100mL deionized water, and shake well. The rubber stopper is placed in a constant temperature water bath heated to boiling, oscillating continuously, heating for 5 minutes to make it gelatinized, and then naturally cooled to room temperature, suck 0.10mL iodine-potassium iodide indicator into the sample solution, shake well , Quickly pour it into a graduated centrifuge tube, centrifuge at 4000r / min for 2min, take the supernatant, use deionized water as a control, and measure the absorbance y corresponding to each mixed starch at 620nm on a 722N visible spe...

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Abstract

The invention discloses a method for testing the content of tapioca starch in tapioca and maize mixed starch. The method comprises the steps as follows: firstly, an iodine-potassium iodide indicator is prepared, water is added to a to-be-tested sample, the mixture is oscillated and shaken fully and uniformly, heated to boiling for full gelatinization and cooled naturally to the room temperature, the iodine-potassium iodide indicator is extracted and dropwise added to a sample solution obtained in the previous step, and the mixture is oscillated and shaken fully and uniformly for developing; and a developed sample is centrifuged, supernate is taken, deionized water is used for comparison, a light absorption value y corresponding to the mixture is tested by a visible spectrophotometer, the y is substituted into a regression equation, and a content percentage of the tapioca starch in the tapioca and maize mixed starch is calculated.

Description

technical field [0001] The invention relates to a detection method for a starch mixture, in particular to a detection method for determining the cassava starch content in cassava-corn mixed starch. Background technique [0002] Tapioca starch is a powder obtained by dehydrating and drying cassava after starch extraction. Tapioca starch has good physical and chemical properties such as low non-starch impurity content, high viscosity, low gelatinization temperature, transparent and stable paste liquid, good film-forming property, and strong permeability. It is a good raw material for processing modified starch and starch sugar. There is a big difference between tapioca starch and corn starch in production cost and sales price, and the price of tapioca starch is relatively high. Some starch practitioners mix corn starch with tapioca starch for use or sell in order to obtain more profits. However, the performance of the mixed starch is far different from that of pure tapioca s...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N21/31
Inventor 孙琛田映良郑旺斌王宝民
Owner 甘肃圣大方舟马铃薯变性淀粉有限公司
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