Method for quickly separating polar components in frying oil on line
A polar component and frying oil technology, applied in the detection field, can solve the problems of sample loss, high cost, cumbersome steps, etc., and achieve the effect of high accuracy, low cost and fast separation speed
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[0032]Example 1: A device for quickly separating polar components in frying oil online
[0033]Such asfigure 1 Said device is composed of a gel chromatography column, a refractive index detector, and a silica gel chromatography column in series. The gel chromatography column, the refractive index detector, and the silica gel chromatography column are connected through a four-way valve and two six-way valves. The silica gel chromatography column is connected in series, the outlet of the gel chromatography column, the inlet of the refractive index detector and the outlet of the silica gel chromatography column are connected to the same multi-way valve; the outlet of the refractive index detector and the inlet of the silica gel chromatography column pass at least two The multi-port valve is connected; the multi-port valve connected to the outlet of the refractive index detector is connected with a nitrogen port; the multi-port valve connected to the inlet of the silica gel chromatography ...
Example Embodiment
[0035]Example 2: A method for quickly separating polar components in frying oil
[0036](a) Accurately weigh 200 mg of frying oil stored at -20°C, dissolve it in a little dichloromethane and load it on a gel chromatography column (filler is Sephadex LH-20), add the eluent (methanol: dichloro Methane=2:3) Separation. Such asfigure 1 As mentioned in a, the gel chromatography column and the refractive index detector are connected in series through valve 1. The gel column chromatography first separates the components with large molecular weight differences, and then enters the refractive index detector through valve 1 for detection to obtain TGO , TGD, the gel column flow rate is one drop per second, starting from the 10th minute, the polar substances will flow out respectively, the first one is TGO (10-15min), and then TGD (15-19.5min).
[0037](b) such asfigure 1 As mentioned in b, after the TGD collection is completed, switch valve 2 so that TG and ox-TG are collected in the collector (f...
Example Embodiment
[0040]Example 3: A method for detecting the content of polar components in frying oil
[0041]The method of Example 2 was used to separate the polar substances in the frying oil to obtain six components, and the content was detected by a refractive index detector. The specific steps are as follows:
[0042](a) Accurately weigh 0.0100g of the six components obtained in Example 2 and dissolve them in 1.0mL of tetrahydrofuran, and then configure the concentration to be 0.01g / mL, 0.008g / mL, 0.006g / mL, 0.004g / mL mL, 0.002g / mL, 0g / mL standard solution (or 0.01g / mL, 0.0075g / mL, 0.005g / mL, 0.0025g / mL, 0g / mL), each component is obtained by the differential refractive index detector The standard curve is likeFigure 5 Shown, R2All are greater than 0.99; the condition of the differential refractive index detector is the standard mode; the allowable drift value is 5000nRIU / h; the allowable noise value is 500nRIU; the temperature is 35℃; the flow rate is 2.4mL / min.
[0043](b) Steps (b)-(e) of Example 2 w...
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