Determination of Methanol Solvent Residue in Nitazoxanide with Headspace GC-SIM-MS
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摘要: 利用气相色谱-选择离子监测质谱联用仪(GC-SIM-MS)测定硝唑尼特样品中溶剂残留甲醇的含量, 顶空进样, 温度为70℃, 时间为20min.SIM定量离子m/z32, 参考离子m/z31, 30和29.甲醇质量浓度在0.5~100μg/mL内呈良好的线性(R2=0.99992).方法相对标准偏差为2.49%~4.85%, 样品加标回收在94.5%~102.8%之间, 检测限为0.5μg/mL, 符合定量分析的要求.关键字:硝唑尼特; 甲醇; 顶空进样; 气相色谱-选择离子监测质谱联用仪
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关键词:
- 硝唑尼特 /
- 甲醇 /
- 顶空进样 /
- 气相色谱-选择离子监测质谱联用仪
Abstract: The determination of methanol solvent residues in the samples of nitazoxanide using gas chromatography-selected ion monitoring-mass spectrometry(GC-SIM-MS)has been curried out. A peak area standard curve method is used as the quantitative method. The heating temperature of the sample was 70 ℃, with an equilibrium time of 20 min, SIM m/z 32, m/z 31, 30, and 29. The concentration of toluene was linear in the range of 0.5~100 μg /mL (R2=0.999 92). The relative standard deviation of the method was 2.49%~4.85%, the recovery was between 94.5%~102.8%, the detection limit was 0.5 μg/mL, which were in accordance with the requirement of quantitative analysis.-
Key words:
- nitazoxanide /
- methanol /
- headspace /
- GC-SIM-MS
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表 1 不同顶空温度和保温时间的甲醇测得质量
Table 1. Recoveries of methanol with different head space temperatures and holding times
序号 顶空温度/℃ 保温时间/min 甲醇实测质量/μg 1 50 20 9.25 2 50 30 9.41 3 60 20 9.63 4 60 30 9.86 5 70 20 9.95 6 70 30 9.87 7 80 20 9.80 表 2 方法回收率试验
Table 2. Recovery of method
序号 样品中甲醇质量分数/(μg /g) 加入标准甲醇质量分数/(μg /g) 测得甲醇质量分数/(μg /g) 甲醇回收率/% 1 35.2 10.0 44.7 94.5 2 34.3 10.0 44.0 97.2 3 36.2 20.0 55.8 98.0 4 33.7 20.0 53.8 100.5 5 36.5 30.0 67.1 102.0 6 33.9 30.0 62.3 94.7 7 31.8 50.0 83.2 102.8 8 32.7 50.0 80.5 95.6 表 3 样品平行测定结果
Table 3. Results of six parallel determination of samples
序号 次数 1 2 3 4 5 6 平均值 1 甲醇测得质量分数/(mg/kg) 31.3 34.1 32.2 32.8 30.9 29.8 31.8 标准偏差/(mg/kg) 1.38 相对标准偏差/% 4.34 2 甲醇测得质量分数/(mg/kg) 21.9 20.8 22.2 19.9 23.2 21.7 21.6 标准偏差/(mg/kg) 1.04 相对标准偏差/% 4.81 3 甲醇测得质量分数/ (mg/kg) 43.8 47.2 45.4 44.8 45.9 46.1 45.4 标准偏差/(mg/kg) 1.13 相对标准偏差/% 2.49 4 甲醇测得质量分数/(mg/kg) 55.9 54.6 60.5 53.8 52.5 58.2 55.9 标准偏差/(mg/kg) 2.71 相对标准偏差/% 4.85 -
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