Method for rapid determination of aluminum ion content in honey product
An aluminum ion, fast technology, applied in the preparation of test samples, color/spectral property measurement, etc., can solve the problems of cumbersome method system, high measurement cost, long time consumption, etc., to achieve simple operation, reproducibility and precision. Good, the effect of measuring a wide range of concentrations
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Embodiment 1
[0045] Embodiment 1: the preparation of early stage solution
[0046] 1. Preparation of reaction test solution: Preparation of Alizarin Red S solution (0.25g / L) Weigh 0.025g of Alizarin Red S, dissolve in 50mL of absolute ethanol, dilute with distilled water to 100mL.
[0047] 2. Preparation of aluminum ion standard solution (1.0mg / mL): weigh 0.89g AlCl 3 ·6H 2 O (aluminum content is 0.1g), dissolved in deionized water and adjusted to 100mL.
[0048] 3. Preparation of disodium hydrogen phosphate-citric acid buffer solution (pH4.6): Accurately pipette 46.75 mL of 0.2 mol / L disodium hydrogen phosphate solution and 53.25 mL of 0.1 mol / L citric acid solution, and mix to 100 mL.
Embodiment 2
[0049] Embodiment 2: Determination of reaction system and maximum absorption peak
[0050] The natural color of Alizarin Red S solution is yellow. In the acidic medium of disodium hydrogen phosphate-citric acid at pH 4.6, it forms a stable complex water-soluble substance with a certain concentration of aluminum ions. The color is red. Before and after the solution is scanned at full wavelength, it shows that the maximum light absorption peak of Alizarin Red S solution is at 420nm (such as figure 1 ), the maximum absorption peak of the solution is at 490nm after reacting with aluminum ions (such as figure 2 ). Therefore, the components of the reaction system were determined to be: pH4.6 disodium hydrogen phosphate-citric acid buffer solution, alizarin red S solution and aluminum ion solution, and the detection wavelength was 490nm.
Embodiment 3
[0051] Embodiment 3: Optimization of reaction system components and conditions
[0052] On the basis of Example 2, the reaction system and reaction conditions were optimized, and different additions of 0.25g / L Alizarin Red S solution (0.8mL, 1.0mL, 1.2mL, 1.5mL, 1.8mL and 2.0mL ), pH4.6 disodium hydrogen phosphate-citric acid buffer (0.1mL, 0.15mL, 0.20mL and 0.25mL,) and 1.0mg / mL aluminum ion standard solution addition (0.1mL, 0.2mL, 0.3mL , 0.4mL, 0.5mL, 0.6mL, 0.7mL, 0.8mL, 0.9mL and 1.0mL) on the sensitivity and accuracy of the detection method. As a result, the best reaction system is: the total volume of the reaction system is 5.0mL, which is not enough to be constant to volume with deionized water, and wherein the Alizarin Red S solution addition is 1.5mL (such as image 3 ), pH4.6 disodium hydrogen phosphate-citric acid buffer solution is added in an amount of 0.15mL (such as Figure 4 ) and the determination range of aluminum ion is 0.2-0.7mg / mL (such as Figure 5 ...
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