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    • 11. 发明申请
    • METHOD AND APPARATUS FOR SELECTIVE FILTERING OF IONS
    • 选择性过滤离子的方法和装置
    • US20090108194A1
    • 2009-04-30
    • US11251529
    • 2005-09-30
    • Jason S. PageKeqi TangRichard D. Smith
    • Jason S. PageKeqi TangRichard D. Smith
    • B01D59/44
    • H01J49/066G01N27/622
    • An adjustable, low mass-to-charge (m/z) filter is disclosed employing electrospray ionization to block ions associated with unwanted low m/z species from entering the mass spectrometer and contributing their space charge to down-stream ion accumulation steps. The low-mass filter is made by using an adjustable potential energy barrier from the conductance limiting terminal electrode of an electrodynamic ion funnel, which prohibits species with higher ion mobilities from being transmitted. The filter provides a linear voltage adjustment of low-mass filtering from m/z values from about 50 to about 500. Mass filtering above m/z 500 can also be performed; however, higher m/z species are attenuated. The mass filter was evaluated with a liquid chromatography-mass spectrometry analysis of an albumin tryptic digest and resulted in the ability to block low-mass, “background” ions which account for 40-70% of the total ion current from the ESI source during peak elution.
    • 公开了一种可调节的低质量 - 电荷(m / z)滤波器,其使用电喷雾电离来阻挡与不想要的低m / z物质相关的离子进入质谱仪并且为下游离子累积步骤贡献其空间电荷。 低质量过滤器通过使用来自电动离子漏斗的电导限制端子电极的可调势势垒来制造,其阻止具有较高离子迁移率的物质被传输。 滤波器提供从大约50到大约500的m / z值的低质量滤波的线性电压调节。也可以执行m / z 500以上的质量过滤; 然而,更高的m / z物种减弱。 通过对白蛋白胰蛋白酶消化物的液相色谱 - 质谱分析来评估质量过滤器,并且导致阻断低质量“背景”离子的能力,其占离子源的总离子电流的40-70% 峰洗脱。
    • 12. 发明授权
    • Methods for recalibration of mass spectrometry data
    • 重新校准质谱数据的方法
    • US07499807B1
    • 2009-03-03
    • US11524028
    • 2006-09-19
    • Aleksey V. TolmachevRichard D. Smith
    • Aleksey V. TolmachevRichard D. Smith
    • G06F3/00
    • H01J49/0009
    • Disclosed are methods for recalibrating mass spectrometry data that provide improvement in both mass accuracy and precision by adjusting for experimental variance in parameters that have a substantial impact on mass measurement accuracy. Optimal coefficients are determined using correlated pairs of mass values compiled by matching sets of measured and putative mass values that minimize overall effective mass error and mass error spread. Coefficients are subsequently used to correct mass values for peaks detected in the measured dataset, providing recalibration thereof. Sub-ppm mass measurement accuracy has been demonstrated on a complex fungal proteome after recalibration, providing improved confidence for peptide identifications.
    • 公开了重新校准质谱数据的方法,其通过调整对质量测量精度具有实质性影响的参数的实验方差来提高质量精度和精度。 使用通过匹配集合的测量和推定质量值编译的相关质量值对来确定最优系数,从而使总体有效质量误差和质量误差扩展最小化。 随后使用系数来校正在测量数据集中检测到的峰的质量值,从而提供其重新校准。 在重新校准后,在复杂的真菌蛋白质组上已经证明了亚ppm质量测量精度,为肽鉴定提供了改进的置信度。
    • 13. 发明授权
    • Device for two-dimensional gas-phase separation and characterization of ion mixtures
    • 用于二维气相分离和表征离子混合物的装置
    • US07148474B2
    • 2006-12-12
    • US11103984
    • 2005-04-11
    • Keqi TangAlexandre A. ShvartsburgRichard D. Smith
    • Keqi TangAlexandre A. ShvartsburgRichard D. Smith
    • H01J49/40H01J49/26B01D59/44
    • G01N27/624H01J49/004
    • The present invention relates to a device for separation and characterization of gas-phase ions. The device incorporates an ion source, a field asymmetric waveform ion mobility spectrometry (FAIMS) analyzer, an ion mobility spectrometry (IMS) drift tube, and an ion detector. In one aspect of the invention, FAIMS operating voltages are electrically floated on top of the IMS drift voltage. In the other aspect, the FAIMS/IMS interface is implemented employing an electrodynamic ion funnel, including in particular an hourglass ion funnel. The present invention improves the efficiency (peak capacity) and sensitivity of gas-phase separations; the online FAIMS/IMS coupling creates a fundamentally novel two-dimensional gas-phase separation technology with high peak capacity, specificity, and exceptional throughput.
    • 本发明涉及气相离子的分离和表征装置。 该装置包括离子源,场非对称波形离子迁移谱(FAIMS)分析仪,离子迁移谱(IMS)漂移管和离子检测器。 在本发明的一个方面,FAIMS工作电压在IMS漂移电压的顶部被浮动。 另一方面,使用电动离子漏斗实现FAIMS / IMS接口,特别包括沙漏离子漏斗。 本发明提高气相分离的效率(峰值容量)和灵敏度; 在线FAIMS / IMS耦合产生了具有高峰值容量,特异性和卓越吞吐量的基本上新颖的二维气相分离技术。
    • 14. 发明授权
    • Method for increasing the dynamic range of mass spectrometers
    • 增加质谱仪动态范围的方法
    • US06787760B2
    • 2004-09-07
    • US09976505
    • 2001-10-12
    • Mikhail BelovRichard D. SmithHarold R. Udseth
    • Mikhail BelovRichard D. SmithHarold R. Udseth
    • H01J4900
    • H01J49/4215H01J49/004
    • A method for enhancing the dynamic range of a mass spectrometer by first passing a sample of ions through the mass spectrometer having a quadrupole ion filter, whereupon the intensities of the mass spectrum of the sample are measured. From the mass spectrum, ions within this sample are then identified for subsequent ejection. As further sampling introduces more ions into the mass spectrometer, the appropriate rf voltages are applied to a quadrupole ion filter, thereby selectively ejecting the undesired ions previously identified. In this manner, the desired ions may be collected for longer periods of time in an ion trap, thus allowing better collection and subsequent analysis of the desired ions. The ion trap used for accumulation may be the same ion trap used for mass analysis, in which case the mass analysis is performed directly, or it may be an intermediate trap. In the case where collection is an intermediate trap, the desired ions are accumulated in the intermediate trap, and then transferred to a separate mass analyzer. The present invention finds particular utility where the mass analysis is performed in an ion trap mass spectrometer or a Fourier transform ion cyclotron resonance mass spectrometer.
    • 首先使离子样品通过具有四极离子过滤器的质谱仪来提高质谱仪的动态范围的方法,由此测定样品的质谱强度。 从质谱中,然后鉴定该样品内的离子用于随后的喷射。 随着进一步的采样将更多的离子引入质谱仪中,将适当的rf电压施加到四极离子过滤器,从而选择性地排出先前识别的不需要的离子。 以这种方式,期望的离子可以在离子阱中收集较长时间,从而允许更好地收集和随后分析所需的离子。 用于积聚的离子阱可以是用于质量分析的相同的离子阱,在这种情况下,质量分析是直接进行的,或者它可以是中间阱。 在收集是中间阱的情况下,期望的离子积聚在中间阱中,然后转移到单独的质量分析器。 在离子阱质谱仪或傅里叶变换离子回旋共振质谱仪中进行质量分析的本发明具有特殊的用途。