Method for detecting propyl gallate and formaldehyde
A technology of propyl gallate and formaldehyde, which is applied in the field of chemical analysis and detection to achieve the effects of rapid reaction, consistent detection results and reliable detection
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Embodiment 1
[0026] Embodiment 1: Determination of formaldehyde in PG and dried white fungus in soybean oil sample
[0027] 1. Preparation of zinc-based single-atom nanozyme Zn-N-C: Stir and mix 0.7g zinc acetate, 20mL methanol and 50g potassium chloride, place in a vacuum drying oven, dry at 80°C for 24h, mix the dried solid with 0.4g After mixing 2-methylimidazole and 20mL methanol, place in a vacuum oven, dry at 80°C for 48h to remove methanol, place the obtained solid particles in a tube furnace, and calcinate at 750°C for 2h under the protection of nitrogen, and wash the obtained solid with pure water Wash to obtain small black particles insoluble in water, namely Zn-N-C;
[0028] 2. Preparation of the working curve of propyl gallate: add 0.1mg / mL zinc-based single-atom nanozyme (Zn-N-C) 100µL, 50mmol / L H 2 o 2 100µL standard solution of propyl gallate with a concentration in the range of 1.25~200mg / kg, dilute to the mark with citric acid-disodium hydrogen phosphate buffer solution ...
Embodiment 2
[0042] Example 2: Determination of formaldehyde in PG and chicken feet in blended oil samples
[0043] 1, Zn-N-C preparation: with embodiment 1;
[0044] 2, the making of propyl gallate working curve: with embodiment 1;
[0045] 3, formaldehyde working curve making: with embodiment 1;
[0046] 4. Determination of PG in blend oil samples
[0047] (1) Sample treatment: Accurately weigh 2g of blended oil into a 25mL colorimetric tube, add 7mL of ethanol solution with a volume concentration of 95%, vortex for 1min to mix well, let it stand for a while, and heat it in a water bath at 85°C for 15s to promote its separation. layer; transfer the supernatant to the concentration bottle with a straw, then repeat the extraction twice with 7mL 95% ethanol solution, combine the extracts and dilute to 25mL to obtain the sample solution to be tested;
[0048] (2) Sample determination: Same as in Example 1, the content of PG in the blended oil sample was 11.21 mg / kg.
[0049] 5. Determina...
Embodiment 3
[0052] Embodiment 3: Determination of PG in cookies and formaldehyde in shredded bread
[0053] 1. Preparation of Zn-N-C: Stir and mix 1g of zinc acetate, 20mL of methanol and 50g of potassium chloride, place it at 80°C for 30h in vacuum, and mix the dried solid with 0.3g of 2-methylimidazole and 23mL of methanol After that, place it at 80°C for 30 hours to remove methanol, place the obtained solid particles in a tube furnace, and calcinate at 800°C for 2 hours under the protection of nitrogen, and wash the obtained solids with pure water to obtain small black particles that are insoluble in water. It is zinc-based single-atom nanozyme Zn-N-C;
[0054] 2, making of propyl gallate working curve: with embodiment 1.
[0055] 3, formaldehyde working curve making: with embodiment 1;
[0056] 4. Determination of PG in cookies
[0057] (1) Sample treatment: Weigh 5.00g of evenly powdered biscuit sample into a 100mL Erlenmeyer flask, add 8mL of absolute ethanol, vortex mix for 1min...
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