使用生物生成13C标记的多个内部标准的优点,用于稳定同位素辅助LC-MS基脂管药物
Malak A Jaber1,2, Bruna de Falco2, Salah Abdelrazig2
1Faculty of Pharmacy and Medical Sciences, University of Petra, Amman, Jordan.
Analytical methods : advancing methods and applications
|June 13, 2023
概括
这项研究开发了一种使用13C标记酵母和细菌作为内部标准 (IS) 的新方法,以获得更准确的脂管学. 这种方法显著减少了样本准备和分析期间脂质量定量的变化.
科学领域:
- * 分析化学 分析化学
- * 生物化学 * 生物化学
- * 质谱测量 质谱测量
背景情况:
- *精确的脂质量测量在脂质学中至关重要,但因样品制备变化,矩阵效应和仪器非线性而受到挑战.
- *现有的同位素标记的内部标准 (IS) 对哺乳动物脂质组的覆盖范围有限,阻碍了全面的分析.
- * 脂质的化学多样性使复杂的生物样本中的准确识别和量化变得复杂.
研究的目的:
- * 探索在微生物物种中使用体内13C标签作为13C标签内部标准 (13C-ISs) 的来源,以改善脂管学.
- * 确定最佳的微生物来源,以产生全面的13C-IS脂质混合物,以获得精确的LC-MS基脂质组学.
- *评估生物生成的13C-ISs在正常化数据和降低脂管学研究中的变异性方面的有效性.
主要方法:
- * 在四种微生物物种中采用了体内13C标签策略:大肠杆菌 (Escherichia coli),状螺旋菌 (Arthrospira platensis),大肠杆菌 (Saccharomyces cerevisiae) 和牧羊 (Pichia pastoris).
- *分析标记物种的提取物,以确定均标记脂质的百分比.
- * 采用了来自最佳微生物来源的13C-IS脂质混合物,用于LC-MS脂管学中的数据正常化.
主要成果:
- * 皮奇亚牧草和Saccharomyces cerevisiae提取物呈现出最高百分比的均标记的脂质 (83%).
- *P. pastoris提取物被确定为13C-IS的最佳来源,用于全面的数据规范化.
- *使用生物生成的13C-IS脂质混合物,与其他规范化方法相比,显著降低了脂质变化系数 (CV%).
结论:
- * 一种体内13C标记策略提供了一种有效的手段,可以为脂管学产生多样化的13C-IS.
- * 生物生成的13C-IS,特别是来自P. pastoris,提高了数据规范化的准确性,并减少了LC-MS脂管学中的技术变异性.
- *这种方法提高了全面的脂管学分析的可靠性和定量准确性,特别是在大型样本集和长期研究中.
相关概念视频
Carbon-13 (¹³C) NMR: Overview
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
Chemical Shift: Internal References and Solvent Effects
In an NMR sample, precise measurement of the absolute absorption frequencies of nuclei is difficult. A standard internal reference compound is added, and the frequency difference between the reference signal and sample signals is measured.
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...
The internal reference compound generally used in NMR spectroscopy is tetramethylsilane (TMS). TMS is preferred because it is chemically inert, soluble in NMR solvents, and easily removable. Also, the highly shielded methyl protons in TMS yield an intense...


