
Preparation and evaluation of acetamiprid quality control samples in rapeseed stalk
Yong-bo LAN, Chang-hong LIN, Pei-chun JIANG, Cong WU, Hui HUANG, Shu-ran XU, Shi-min CAI, Yong LIN, Yan-jie ZHENG
CHINESE JOURNAL OF OIL CROP SCIENCES ›› 2024, Vol. 46 ›› Issue (2) : 437-442.
Preparation and evaluation of acetamiprid quality control samples in rapeseed stalk
In order to ensure the accuracy and reliability of the rapid determination of acetamiprid pesticide residues in rapeseed stalk, a method for the preparation of quality control samples was established and evaluated. The lyophilized quality control samples were prepared by matrix spiking and vacuum freeze-drying. And the determination of acetamiprid in the quality control samples was carried out by liquid chromatography-tandem mass spectrometry. The uniformity of the samples was assessed by random sampling and the stability of the samples was evaluated by observing the changes of acetamiprid over a period of one month. The quality control samples prepared by this method are homogeneous and stable, easy to store and transport, and suitable for rapid testing in the field of rapid test kit validation and blind sample assessment. This study established a simple process for the preparation of lyophilised powder quality control samples of rapeseed stalk, which provides a data reference for the study of common key technologies for the preparation of quality control samples of pesticide residues in vegetables.
acetamiprid / quality control samples / rapeseed stalk / freeze-dried vegetable powder {{custom_keyword}} /
Table 1 Qualitative and quantitative ion pairs, RF lens and collision energy of acetamiprid表1 啶虫脒的定性定量离子对及透镜电压、碰撞能量 |
定性离子对 Qualitative ion pair /(m/z) | 定量离子对 Quantitative ion pair /(m/z) | 透镜电压 RF lens /V | 碰撞能量 Collision energy /V |
---|---|---|---|
223>126 | 223>126 | 105 | 33.1 |
223>90 | 20.2 |
Table 2 Results of recovery experiments (n=6)表2 添加回收率实验结果 |
浓度水平 Concentration level /(mg/kg) | 回收率 Recovery /% | 相对标准偏差 RSD /% |
---|---|---|
0.01 | 92.3~101.2 | 3.30 |
2 | 96.8~105.5 | 3.07 |
3 | 94.1~97.5 | 1.35 |
Table 3 Homogeneity assessment results表3 均匀性评估结果 |
样本 Samples | 结果1 Results 1 /(mg/kg) | 结果2 Results 2 /(mg/kg) | 组内平均值 Intra group mean /(mg/kg) | 总平均值 Total average /(mg/kg) |
---|---|---|---|---|
1 | 21.13 | 20.32 | 20.73 | 21.45 |
2 | 21.21 | 21.72 | 21.47 | |
3 | 22.29 | 20.23 | 21.26 | |
4 | 21.32 | 21.13 | 21.23 | |
5 | 20.97 | 21.46 | 21.22 | |
6 | 21.49 | 21.40 | 21.45 | |
7 | 20.84 | 22.05 | 21.45 | |
8 | 21.84 | 22.49 | 22.17 | |
9 | 21.62 | 22.20 | 21.91 | |
10 | 21.39 | 21.81 | 21.60 | |
组间方差 Between-group variance | 0.314 | |||
组内方差 Intra-group variance | 0.392 | |||
F | 0.801 | |||
F 0.05(9,10) | 3.02 |
Table 4 Interior stability assessment results表4 室内稳定性评估结果 |
时间 Time /d | 检验平均值 Inspection average value /(mg/kg) | 标准偏差 Standard deviation | t | t 0.05(10) |
---|---|---|---|---|
0 | 21.22 | 0.266 | / | 2.23 |
10 | 21.44 | 0.824 | 0.618 | |
20 | 21.68 | 0.477 | 2.088 | |
30 | 21.01 | 0.086 | 1.795 |
Table 5 Transport stability assessment results表5 运输稳定性评估结果 |
时间 Time/day | 检验平均值 Inspection average value/(mg/kg) | 标准偏差 Standard deviation | t | t 0.05(10) |
---|---|---|---|---|
0 | 21.22 | 0.266 | / | 2.23 |
运输后 After transport | 21.10 | 0.091 | 1.032 |
Table 6 Evaluation results of rapid detection products表6 快检产品评价结果表 |
样品情况 Sample information | 产品1检测结果 Test results of product 1 | 产品2检测结果 Test results of product 2 | 产品3检测结果 Test results of product 3 | |||
---|---|---|---|---|---|---|
阳性结果数 No. of positive results | 阴性结果数 No.of negative results | 阳性结果数 No. of positive results | 阴性结果数 No.of negative results | 阳性结果数 No. of positive results | 阴性结果数 No.of negative results | |
阳性(1倍检出限) Positive (1× detection limit) | 12 | 0 | 12 | 0 | 12 | 0 |
阴性(0.5倍检出限) Negative (0.5× detection limit) | 0 | 12 | 0 | 12 | 12 | 0 |
假阴性率 /% False negative rate /% | 0 | 0 | 0 | |||
假阳性率 /% False positive rate /% | 0 | 0 | 100 |
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