A method for measuring the peroxide value of oil
A technology for peroxide value and oil, applied in the field of determination of oil peroxide value, can solve the problems of high cost, low sensitivity, long detection time, etc., and achieve the effects of simple operation, good repeatability and high sensitivity
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[0040] Preparation of MOF-Pb phosphorescent materials:
[0041] The first step: mix 1.1g lead nitrate, 0.3g terephthalic acid and 40mL DMF (N-N dimethylformamide) in a 250mL beaker, stir until dissolved to form a mixed solution;
[0042] The second step: add 2.3 mL of triethylamine to the above mixed solution, and stir at room temperature for 3 h to obtain a milky white turbid liquid;
[0043] The third step: centrifuging the milky white turbid liquid to obtain a precipitate, washing the precipitate with DMF, soaking the washed precipitate in a dichloromethane solution, and finally vacuum drying to obtain a MOF-Pb phosphorescent material.
[0044] The MOF-Pb phosphorescent material was prepared through the above steps, and the properties of the MOF-Pb phosphorescent material were characterized. figure 2 are the excitation and emission spectra of MOF-Pb, such as figure 2 shown, from figure 2 It can be seen that MOF-Pb is excited at 305 nm and emitted at 490 nm.
[0045]...
Embodiment 1
[0054] In Embodiment 1, a method for measuring the peroxidation value of oil and fat is proposed, comprising the following steps:
[0055] Step S1: Take 0.05g of standard oil sample (n-propanol and oil sample ratio of 9:1), add 4 mL of ethanol, dichloromethane, chloroform, n-propanol and DMF respectively, shake on a shaker for 30s, and let stand for 2min Completely dissolve grease to form different standard oil sample solutions;
[0056] Step S2: adding 10 μL of saturated potassium iodide solution to each standard oil sample solution respectively, fully reacting for 1 min to form a mixed solution;
[0057] Step S3: adding 10 mg of the MOF-Pb phosphorescent material to the mixed solution for 1 min of reaction; and
[0058] Step S4: use a fluorescence spectrometer to detect the phosphorescence intensity of the reacted solution obtained in step S3 to calculate the peroxide value of the standard oil sample.
[0059] Through the above steps to add different organic solvents to te...
Embodiment 2
[0061] In the second embodiment, a method for measuring the lipid peroxide value is proposed, comprising the following steps:
[0062] Step S1: respectively take 0.025, 0.05g, 0.1g, 0.2g, 0.4g standard oil samples (n-propanol and oil sample ratio of 9:1), add them to 4mL of ethanol, shake on a shaker for 30s, and let stand for 2min to make the oil completely Dissolve to form different standard oil-like solutions;
[0063] Step S2: adding 10 μL of saturated potassium iodide solution to each standard oil sample solution respectively, fully reacting for 1 min to form a mixed solution;
[0064] Step S3: adding 10 mg of the MOF-Pb phosphorescent material to the mixed solution for 1 min of reaction; and
[0065] Step S4: use a fluorescence spectrometer to detect the phosphorescence intensity of the reacted solution obtained in step S3 to calculate the peroxide value of the standard oil sample.
[0066] In order to explore the influence of different standard oil samples on the dete...
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