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    Home > Chemicals Industry > Chemical Technology > Recovery rate and precision of determination method for testosterone, epitestosterone and progesterone residues in beef liver and beef

    Recovery rate and precision of determination method for testosterone, epitestosterone and progesterone residues in beef liver and beef

    • Last Update: 2021-09-12
    • Source: Internet
    • Author: User
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    8.
    2.
    1.
    9 Method recovery and precision

    Animal muscle and animal liver samples without steroid residues were used for additive recovery and precision experiments
    .


    The results of recovery and precision of addition are shown in Table 8-10 and Table 8-11


    Table 8-10 Laboratory test results of standard addition recovery rate of blank animal muscle (n=10)

    It can be seen from Table 8-10 that testosterone in animal muscles is added at a level of 0.
    05 to 0.
    5 μg/kg, and the average recovery rate is 97.
    3% to 108.
    2%, and the relative standard deviation is between 3.
    1% and 15.
    9%; epitestosterone is at the added level of 0.
    05 ~0.
    5μg/kg, the average recovery rate is 72.
    4%~104.
    6%, the relative standard deviation is between 5.
    0%~24.
    5%; the progesterone supplement level is 0.
    25~2.
    5μg/kg, the average recovery rate is 86.
    1%~99.
    4 %, the relative standard deviation is between 6.
    8% and 9.
    2%
    .

    Table 8-11 Laboratory test results of standard addition recovery rate of blank animal liver tissue (n=10)

    It can be seen from Table 8-11 that the testosterone in animal liver is supplemented at the level of 0.
    25~2.
    5μg/kg, the average recovery rate is 101.
    6%~11.
    7%, and the relative standard deviation is between 2.
    4%~5.
    2%; epitestosterone is at the supplementation level of 0.
    25 ~2.
    5μg/kg, the average recovery rate is 101.
    9%~118.
    0%, the relative standard deviation is between 3.
    5%~11.
    0%; the progesterone addition level is 0.
    25~2.
    5ug/kg, the average recovery rate is 86.
    5%~98.
    2 %, the relative standard deviation is between 3.
    5% and 10.
    0%
    .

    8.
    2.
    1.
    10 Repeatability and reproducibility

    Under repeatability test conditions, the absolute difference between the two independent test results obtained does not exceed the repeatability limit (r).
    If the difference exceeds the repeatability limit (r), the test results should be discarded and the two single tests should be completed again.
    Determination
    .


    Under the reproducibility test conditions, the absolute difference between the two independent test results obtained does not exceed the reproducibility limit (R)


    Table 8-12 Content range and repeatability and reproducibility equation (substrate is muscle)

    Table 8-13 Content range and repeatability and reproducibility equation (substrate is liver)

     

     

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