Method and kit for detecting illegal cooking oil

A detection method and technology of gutter oil, applied in measuring devices, material analysis by observing the influence of chemical indicators, instruments, etc., can solve the problems of difficult operation, remote indicators, high missed detection rate, etc., and achieve obvious detection effect, Simple operation and high detection rate

Active Publication Date: 2013-08-28
WUXI ZODOLABS BIOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The above-mentioned detection methods are aimed at single indicators, complex equipment, remote indicators, difficult operation, high professional requirements, and slow detection speed.
[0007] Patent 201210236063.8 discloses an acid value detection reagent, the color of the oil sample detection solution is pure light yellow, the acid value reaches 8mgKOH/g, the detection sensitivity is low, and the missed detection rate is high
At the same time, the color of the standard solution of the polar substance detection reagent is too light, the color of the sample solution is difficult to

Method used

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  • Method and kit for detecting illegal cooking oil
  • Method and kit for detecting illegal cooking oil
  • Method and kit for detecting illegal cooking oil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Prepare oil sample 1, and measure the acid value of oil sample 1 according to the standard GB / T-5530 2005 method to be 6 and the peroxide value to be 10. The oil is heat treated with the addition of 0.2% water.

[0045] Utilize the method of the present invention to measure as follows:

[0046] (1) Determination of acid value

[0047] After oil sample 1 is mixed with reagent A, the result is judged by color comparison with the color comparison card.

[0048]

[0049] (2) Determination of peroxide value

[0050] Reagent B: an aqueous solution containing cuprous iodide with a mass volume concentration of 0.1% and potassium iodide with a mass volume concentration of 10%;

[0051] Reagent E: 1% to 15% pyrrole aqueous solution with mass volume concentration.

[0052] After mixing reagent B and oil sample at a volume ratio of 2:1 to 10:1, add reagent E, and judge the result by color comparison with a color comparison card.

[0053]

[0054] (3) Determination of polar...

Embodiment 2

[0062] Example 2 waste oil detection kit

[0063] Kit composition

[0064]

[0065] The reaction tubes A, B, C, and D are respectively filled with reagents A, B, C, and D.

[0066] The components of each reagent are:

[0067] Reagent A: 0.01% (m / v) thymol blue and 0.001% (m / v) colorless phenolphthalein, dissolved in a mixed solution of chloroform and ethanol (volume ratio 10:1), adjusted with citrate buffer To neutral, 1ml per tube;

[0068] Reagent B: an aqueous solution containing cuprous iodide with a mass volume concentration of 0.1% and potassium iodide with a mass volume concentration of 10%, 1ml per tube;

[0069] Reagent C: 78% volume concentration of isoamyl alcohol, 20% volume concentration of isooctane, 2% volume concentration of acetic acid, 2ml per tube;

[0070] Reagent D: 250mg anhydrous copper sulfate powder;

[0071] Reagent E: mass volume concentration (m / v) 10% pyrrole aqueous solution, 10ml per bottle;

[0072] Reagent F: mass volume concentration ...

Embodiment 3

[0075] Example 3 Determination of oil samples using a kit (No. 930028)

[0076] The assay was performed using the kit in Example 2.

[0077] (1) Detection of acid value

[0078] Take a reaction tube A, open the cover, use a 3mL pipette to draw 2 mL of the oil sample to be tested and drop it into the reaction tube A, tighten the cover, react at room temperature, shake and mix well for 1 minute,

[0079] Immediately observe the color of the solution in the tube, and compare it with the color comparison card. The value consistent with the color of the color comparison card is the acid value of the oil sample to be tested.

[0080] The color of the solution turned yellow immediately; compared with the color chart, the acid value was 6, exceeding the standard.

[0081] (2) Detection of peroxide value

[0082] Take a reaction tube B, open the cover, use a 0.5 mL pipette to draw 3 drops of the oil sample to be tested and drop it into the reaction tube B, then use a 0.5 mL pipette ...

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Abstract

The invention discloses a method for detecting illegal cooking oil. According to the method, the illegal cooking oil is judged by determining four indexes including acid value, peroxide value, polar materials and water content. The invention also discloses a kit special for the method. The method and kit for detecting the illegal cooking oil are simple and easy to operate, high in speed, obvious in detection effect and high in detectable rate.

Description

technical field [0001] The invention relates to a detection method and a detection kit for waste oil. Background technique [0002] "Gutter oil" generally refers to all kinds of low-quality oils that exist in daily life, such as recycled cooking oil, old frying oil, oil boiled from slaughtered animal scraps, etc. Long-term consumption may cause cancer and is extremely harmful to the human body. big. However, some unscrupulous traders are driven by profit and regardless of people's lives and safety, privately produce and process waste oil and sell it as edible oil to some small restaurants at a low price, which brings great harm to people's body and mind. [0003] At present, there is no unified standard for the detection of waste oil in China. In the current national mandatory standard "Hygienic Standards for Edible Vegetable Oils" (2716-2005), the physical and chemical indicators of edible oils include acid value, peroxide value, leached oil solvent residue, free phenol (...

Claims

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Application Information

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IPC IPC(8): G01N21/78G01N30/90
Inventor 卞禹卜谈铭杨晓慧李林
Owner WUXI ZODOLABS BIOTECH
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