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    Home > Chemicals Industry > Chemical Technology > Fast determination of acid value of edible vegetable oil (test paper method SFDA-HX003)

    Fast determination of acid value of edible vegetable oil (test paper method SFDA-HX003)

    • Last Update: 2022-03-17
    • Source: Internet
    • Author: User
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    To evaluate whether edible vegetable oil meets national health standards, the commonly used physical and chemical indicators are acid value and peroxide value
    .
    The national standard inspection methods use acid-base titration and oxidation-reduction titration respectively

    .
    These two methods need to calibrate the titrant and perform it in the laboratory

    .
    Quick measurement not only speeds up the detection speed, but also solves the problem of on-site detection

    .

    [Detection principle]

    The acid value refers to the content of free fatty acids in vegetable oils
    .
    The acid value can reflect whether the oil is rancid and the degree of rancidity

    .
    Eating rancid oils can cause symptoms of poisoning

    .
    The country has a unified maximum limit standard for the acid value of edible vegetable oil, that is, the acid value of edible vegetable oil product oil is ≤3mg KOH/g, and the acid value of vegetable crude oil is ≤4mg KOH/g

    .

    The rapid test card for acid value of edible oil (hereinafter referred to as the rapid test card) adopts the method of comparing the color development of paper and the standard color plate for daily visual quantification
    .
    The free fatty acid produced by the rancidity of the edible vegetable oil reacts with the reagent in the test paper to reflect the degree of rancidity of the fat

    .

    [Reagent]

    Acid value rapid test card: sealed package, 4~10℃ dry storage
    .
    The best ambient temperature for use is 25±5℃, and the ambient humidity should be above 20%

    .
    The test strip taken out of the package should be used within 10 minutes, and the test strip after opening should be used within 1 month

    .
    If there are red marks on the acid value paper, the paper has been contaminated or has expired

    .

    [Operation method] Take an appropriate amount of oil sample in a clean, dry container; insert the end of the medicated test paper into the oil sample for 1 to 2 seconds, take it out immediately and start timing; the reaction time of the acid value test paper is (90±5)s, When the timing reaches the required response time, compare the color of the test paper with the colorimetric plate on the packaging box
    .

    [Result judgment]

    The test range of acid value paper is 0~5.
    0mg KOH/g

    .
    The marked value under the color block of the same color is the detected value of the sample

    .
    If the color of the test paper is between two color blocks, take the middle value of the two

    .

    For the samples whose acid value exceeds the national regulations on site monitoring (see Table 3-1), they should be sent to the laboratory for precise quantification
    .

    Table 3-1 Hygienic Indexes of Limits for Common Edible Oils and Fats

    Related link: Rapid detection of non-edible oil in edible oil

     

     

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