Method for detecting content of L-hydroxyproline in dairy product
A technology of hydroxyproline and detection method, which is applied in the directions of measuring devices, instruments, scientific instruments, etc., can solve the problems of restricting wide application and restricting the wide configuration of instruments, and achieves simple and fast operation, simple and fast operation, and rich structural information. Effect
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Embodiment 1
[0047] Collagen powder was added to the pure milk sample (L-hydroxyproline was not detected) to prepare the simulated positive sample of liquid dairy product in this embodiment.
[0048] 1. Sample pretreatment.
[0049] Weigh 2.0 g of sample, add 6 mL of 10.6 mol / L hydrochloric acid solution, seal the tube in vacuum, and hydrolyze at 110 °C for 12 h. Evaporate the solvent, add water to dissolve, adjust the NaOH solution to neutral, add water to make it 25mL. Transfer to a 50mL centrifuge tube, centrifuge at 8000 rpm for 5min, pass through a 0.22μm microporous membrane, and wait for detection.
[0050] 2. Hydrophilic chromatography (HILIC) analytical column for high performance liquid chromatography-tandem mass spectrometry
[0051] In the present invention, the basic principle of carrying out high-performance liquid chromatography-tandem mass spectrometry through the hydrophilic chromatography (HILIC) analytical column is that the sample is hydrolyzed into various amino acid...
Embodiment 2
[0077] (1) Sample pretreatment:
[0078] Weigh 1.5g of commercially available yogurt, add 1.0mL of distilled water and mix well, add 6-9mL of 10.6mol / L hydrochloric acid solution, seal the tube in vacuum, hydrolyze at 110°C for 16h, evaporate the solvent, add water to dissolve, and adjust to Neutral, add water to 25mL, transfer to a 50mL centrifuge tube, centrifuge at 8000 rpm for 10min, dilute the supernatant 5 times with 10mmol / L ammonium acetate aqueous solution with a volume percentage of 20%, pass through a 0.22μm microporous membrane, Prepare a test solution.
[0079] (2) High-performance liquid chromatography-tandem mass spectrometry was performed on a hydrophilic chromatography (HILIC) analytical column, and the method was the same as in Example 1.
[0080] The same positive sample was analyzed 5 times by the above analysis method, and accurate spectra and quantitative information could be obtained for each analysis. Compared with the standard curve, the results are s...
Embodiment 3
[0085] (1) Sample pretreatment
[0086] Weigh 0.5g of commercially available milk powder, add 2.0mL of distilled water to reconstitute, add 6-9mL of 10.6mol / L hydrochloric acid solution, seal the tube in vacuum, hydrolyze at 110°C for 14h, evaporate the solvent, add water to dissolve, adjust to neutral with NaOH solution , add water to make up to 25mL, transfer to a 50mL centrifuge tube, centrifuge at 8000 rpm for 8min, and pass through a 0.22μm microporous membrane to prepare the test solution.
[0087] (2) High-performance liquid chromatography-tandem mass spectrometry was performed on a hydrophilic chromatography (HILIC) analytical column, and the method was the same as in Example 1.
[0088] The same positive sample was analyzed 5 times by the above analysis method, and accurate spectra and quantitative information could be obtained for each analysis. Compared with the standard curve, the results are shown in Table 4 below:
[0089] Table 4: Determination table of L-hydro...
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