采用胰蛋白酶催化的^(18)O标记联合高效液相色谱-高分辨率串联质谱技术(high performance liquid chromatography-linear ion trap/Orbitrap high-resolution mass spectrometry,HPLC-LTQ/Orbitrap MS/MS)研究阿胶的特征性多肽的^(18)O...采用胰蛋白酶催化的^(18)O标记联合高效液相色谱-高分辨率串联质谱技术(high performance liquid chromatography-linear ion trap/Orbitrap high-resolution mass spectrometry,HPLC-LTQ/Orbitrap MS/MS)研究阿胶的特征性多肽的^(18)O标记情况和明胶混合物中阿胶、牛皮明胶的定量情况。结果表明,阿胶的特征性多肽均能被2个^(18)O原子标记,当^(18)O和^(16)O标记多肽以20∶1、10∶1、5∶1、1∶1和1∶5的质量比例混合时,检测到的^(18)O与^(16)O标记多肽比值分别为19.66、10.24、5.01、1.00和0.20。当阿胶和牛皮明胶质量比以1∶10、1∶1和10∶1混合,以^(18)O标记物为内标,检测到的阿胶与明胶比值分别为0.10、1.02和9.72。因此,胰蛋白酶催化的^(18)O标记联合HPLC-LTQ/Orbitrap MS/MS适用于阿胶产品中目标明胶的含量检测,可为阿胶产品的质量控制提供技术支撑。展开更多
Signal to noise ratio （SNR） and resolution are two important but contradictory characteristics used to evaluate the quality of seismic data. For relatively preserving SNR while enhancing resolution, the signal purit...Signal to noise ratio （SNR） and resolution are two important but contradictory characteristics used to evaluate the quality of seismic data. For relatively preserving SNR while enhancing resolution, the signal purity spectrum is introduced, estimated, and used to define the desired output amplitude spectrum after deconvolution. Since a real reflectivity series is blue rather than white, the effects of white reflectivity hypothesis on wavelets are experimentally analyzed and color compensation is applied after spectrum whitening. Experiments on real seismic data indicate that the cascade of the two processing stages can improve the ability of seismic data to delineate the geological details.展开更多
基金supported by the National Natural Science Foundation of China(Grant No.41174117)PetroChina Innovation Foundation(Grant No.2010D-5006-0301)
文摘Signal to noise ratio （SNR） and resolution are two important but contradictory characteristics used to evaluate the quality of seismic data. For relatively preserving SNR while enhancing resolution, the signal purity spectrum is introduced, estimated, and used to define the desired output amplitude spectrum after deconvolution. Since a real reflectivity series is blue rather than white, the effects of white reflectivity hypothesis on wavelets are experimentally analyzed and color compensation is applied after spectrum whitening. Experiments on real seismic data indicate that the cascade of the two processing stages can improve the ability of seismic data to delineate the geological details.
