Preparation of carbamide detection test paper for dairy food and carbamide detection method
A technology for detecting test paper and urea, which is applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions, can solve the problems that there is no simple, fast and portable method for urea, and achieve The detection method is simple and fast, the cost is reduced, and the effect of simplifying the detection procedure
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Embodiment 1
[0066] Example 1: Preparation of concanavalin-phenol red test paper and its detection of urea-adulterated milk
[0067] 1. Preparation of urea test paper:
[0068] 1) Preparation of indicator solution: prepare a saturated solution of phenol red or its sodium salt with deionized water for later use;
[0069] 2) Preparation of test paper stock solution: take 8g of sword beans, grind them into powder, dissolve them in 100ml of deionized water, filter through 6 layers of gauze to remove residue, and set the filtrate for use;
[0070] 3) Mix equal volumes of the solutions obtained in steps 1) and 2) to form a test paper stock solution;
[0071] 4) Immerse the quantitative filter paper in the original solution of the test paper to fully absorb and saturate it, drain off the excess liquid, spread it on a glass plate and let it dry naturally to form the urea test paper.
[0072] 5) Cut the urea test paper into small squares and use it directly or connect it to the handle.
[0073] ...
Embodiment 2
[0076] Example 2: Preparation of soybean flour-phenol red test paper and its detection of urea-adulterated milk
[0077] 1. Preparation of urea test paper:
[0078] 1) Preparation of indicator solution: prepare a saturated solution of phenol red or its sodium salt with distilled water, dilute to 50%, and set aside;
[0079] 2) Preparation of test paper stock solution: take 5 g of soybeans and grind them into powder, add 100 ml of the indicator solution with a saturation degree of 50% prepared in step 1), mix and settle naturally for 10-30 minutes, and take the upper suspension to be the test paper stock solution;
[0080] 3) Dip the stock solution of the test paper with a large brush and evenly paint it on the quantitative filter paper spread on the glass plate, so that the test paper is fully penetrated into the solution and dried naturally to form the urea test paper;
[0081]4) Cut the urea test paper into small pieces and use it directly or connect it to the handle.
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Embodiment 3
[0084] Example 3: Preparation of kidney bean flour-phenol red test paper and its detection of urea-adulterated milk
[0085] As in Example 1, the sword bean was replaced by kidney beans, and the urea detection test paper was prepared in the same way; and the prepared kidney bean powder-phenol red test paper was used to detect adulterated milk with different concentrations of urea, and the color development results were as follows: image 3 .
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