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由于寡糖分子的极性非常大,化学结构类似,无论反相还是正向色谱柱,保留表现都不是很理想,尤其存在大量的位置异构体和差向异构体时,不能实现较好分离[1]。离子色谱对糖类物质具有很好的保留和分离效果,已有很多相关报道,越来越多糖测定标准方法也首选离子色谱法[2-5]。相较于传统的检测手段,质谱具有高灵敏度、高通量和高选择性等优势,也是在糖类物质检测中的重要分析方法[6]。鉴于离子色谱的分离及质谱检测器的特点,离子色谱和质谱联用进行糖类等强极性化合物的分析具有无可比拟的优势,目前尚属于较新的应用技术,鲜有文献报道,因此本实验建立了基于IC-TSQ Altis的不同聚合度的褐藻寡糖样本的分析,为糖类样本的分离分析提供可靠、前沿的分析方法。
离子色谱与三重四极杆质谱TSQ Altis联用实现10种寡糖的同时分析检测
Simultaneous analysis and detection of 10 oligosaccharides by ion chromatography coupled with triple quadrupole mass spectrometry TSQ Altis
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摘要: 本文建立了针对10种寡糖,包括甘露糖醛酸(M)和古罗糖醛酸(G)的离子色谱串联三重四极杆质谱的分析方法。优化后的离子色谱条件:Thermo Scientific Dionex IonPacTM AS19-4 μm (2 mm× 250 mm, Analytical),200 mmol·L−1氢氧化钠-水为淋洗液,流速0.3 mL·min−1,柱温30 ℃,电导检测器后连外接泵,三通阀加0.25 mL·min−1乙腈。采用ESI源,扫描方式为选择反应检测。结果表明,离子色谱对不同聚合度的甘露糖醛酸和古罗糖醛酸有很好的保留和分离效果,三重四极杆质谱相比传统检测手段具有优异的灵敏度和高选择性;稳定性良好,连续进样5针,RSD均小于6.08%;标曲线性关系良好,R2≥0.9990;方法检出限0.34 μg·L−1;加标回收率均≥90.2%,本方法可用于寡糖的定性及定量分析。Abstract: In this paper, an ion chromatography coupled with triple quadrupole mass spectrometry method was developed for 10 oligosaccharides, including mannuronic acid (M) and guluronic acid (G). Optimized ion chromatographic conditions: Thermo Scientific Dionex IonPacTM AS19-4 μm (2 mm × 250 mm, Analytical), 200 mmol·L−1 sodium hydroxide-water as eluent, flow rate 0.3 L·min−1, column temperature 30 °C, conductivity detector connected to the back External pump, add 0.25 mL·min−1 acetonitrile. The ESI source was used, and the scanning method was selective reaction detection (SRM). The results show that: ion chromatography had good retention and separation effects on mannuronic acid and guluronic acid with different degrees of polymerization, triple quadrupole mass spectrometry has excellent sensitivity and high selectivity compared with traditional detection methods; continuous in 5 injections, the RSDs were all less than 6.08%. The calibration curve has a good linear relationship, R2≥0.9990; the detection limit of the method is 0.34 μg·L−1; the detection results are accurate, and the recovery of the low, middle and high levels of the standard is greater than or equal to 90.2, so this method can be used for the qualitative analysis of oligosaccharides and quantitative analysis.
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表 1 不同聚合度的甘露糖醛酸和古罗糖醛酸的分子式、分子量、m/z值及其对应的加和离子
Table 1. Molecular formulas, molecular weights, m/z values and their corresponding additive ions of Oligomannuronate and Oligoguluronate with different degrees of polymerization
化合物 分子式 分子量 m/z 加和离子 M1/G1 C6H10O7 194 192.9 [M-H]- M2/G2 C12H18O13 370 368.8 [M-H]- M3/G3 C18H26O19 546 544.8 [M-H]- M4/G4 C24H34O25 722 359.8 [M-2H]2- M5/G5 C30H42O31 898 447.9 [M-2H]2- M6/G6 C36H50O37 1074 535.9 [M-2H]2- M7/G7 C42H58O43 1250 623.9 [M-2H]2- M8/G8 C48H66O49 1426 474.3 [M-3H]3- M9/G9 C54H74O55 1602 532.9 [M-3H]3- M10/G10 C60H82O61 1778 443.5 [M-4H]4- 表 2 10种不同寡糖的SRM参数
Table 2. SRM parameters for 10 different oligosaccharides
化合物 母离子(m/z) 子离子(m/z) 碰撞能量/V 最小驻留时间/ms RF透镜电压/V M1/G1 192.89 72.99/112.92/130.99 13.49/10.23/10.23 16.45 42 M2/G2 368.79 131/174.99/192.92 16.48/12.43/14.09 16.45 69 M3/G3 544.83 174.99/192.92/368.97 21.49/24.41/17.17 16.45 155 M4/G4 359.81 174.99/368.97/544.97 10.23/10.23/10.23 16.45 49 M5/G5 447.95 174.99/369/544.97/721 14.85/15.23/13.37/10.23 16.45 65 M6/G6 535.86 544.99/720.99/878.96/896.99 18.15/15.95/13.34/12.96 16.45 122 M7/G7 623.86 527.04/536.07/88/1072.93 15.65/15.08/17.58/15.16 16.45 164 M8/G8 474.31 415.67/536.04/544.99/624.11 10.23/10.23/11.52/10.23 16.45 60 M9/G9 532.91 474.38/527.01/652.30/712.11 10.23/13.75/11.14/10.23 16.45 73 M10/G10 443.48 533.11/624.08/712.09/743 10.23/11.74/10.23/10.23 16.45 49 表 3 线性及检出限
Table 3. Linearity and detection limits
化合物 线性方程 R2 检出限(S/N=3)/(μg·L−1) M1/G1 Y=2.429×104X+1.837×104 0.9999 0.53 M2/G2 Y=3.524×104X+2.035×104 0.9993 0.47 M3/G3 Y=1.835×104X+2.998×104 0.9997 0.65 M4/G4 Y=2.504×104X+1.678×104 0.9994 0.44 M5/G5 Y=1.964×104X+1.995×104 0.9992 0.68 M6/G6 Y=2.587×104X+1.946×104 0.9990 0.54 M7/G7 Y=3.785×104X+3.298×104 0.9995 0.37 M8/G8 Y=2.125×104X+1.986×104 0.9991 0.65 M9/G9 Y=1.843×104X+1.378×104 0.9994 0.77 M10/G10 Y=3.892×104X+2.333×104 0.9999 0.34 表 4 标准品溶液重复进样5次的RSD
Table 4. RSD of 5 replicate injections of standard solution
化合物 M1/G1 M2/G2 M3/G3 M4/G4 M5/G5 M6/G6 M7/G7 M8/G8 M9/G9 M10/G10 保留时间/min 9.94 15.55 23.82 25.22 28.27 30.69 33.00 35.29 37.54 39.63 RSD/% 2.38 2.35 2.28 2.15 4.30 4.60 6.08 4.36 3.83 1.62 表 5 样品加标回收率
Table 5. Sample recovery rate spiking
化合物 本底含量/% 0.5%加标
含量/%0.5%加标
平均回收/%2.0%加标
含量/%2.0%加标
平均回收/%4.0%加标
含量/%4.0%加标
平均回收/%M1/G1 2.53 2.99 91.4 4.44 95.5 6.47 98.5 M2/G2 1.46 1.91 90.2 3.34 93.8 5.23 94.3 M3/G3 4.77 5.26 98.7 6.72 97.6 8.46 92.2 M4/G4 8.62 9.09 93.5 10.51 94.3 12.34 93.1 M5/G5 9.88 10.34 92.1 11.86 98.8 13.86 99.4 M6/G6 7.64 8.10 91.2 9.64 99.9 11.66 100.4 M7/G7 8.32 8.79 93.3 10.32 100.2 12.04 93 M8/G8 6.45 6.95 99.1 8.36 95.6 10.28 95.7 M9/G9 3.27 3.74 94.5 5.22 97.6 6.95 92.1 M10/G10 5.43 5.90 93.8 7.33 94.8 9.07 91.1 -
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