增强了MALDI-2灵敏度,使用反射后电离激光进行高分辨率的MS成像,并与实时显微镜成像相结合
Zhi Geng1, Qiao Jin1, Lin Liu1
1Shimadzu Research Laboratory (Shanghai) Co., Ltd., Shanghai 201206, China.
Analytical chemistry
|August 2, 2024
概括
我们使用反射激光增强了矩阵辅助激光脱离/电离后电离 (MALDI-2) 灵敏度,实现了超过2倍的改进. 这一进步使得更高空间分辨率的质谱成像 (MSI) 能够用于空间奥米学研究.
科学领域:
- 分析化学 分析化学
- 生物化学 生物化学
- 频谱学是一种光谱学.
背景情况:
- 矩阵辅助激光脱吸/电离 (MALDI) 是分析生物样本的关键技术.
- MALDI后离子化 (MALDI-2) 显著提高了对生物代谢物的敏感性.
- 进一步提高MALDI-2的灵敏度和质谱成像 (MSI) 解析度对于详细的空间信息学至关重要.
研究的目的:
- 为了提高MALDI-2的灵敏度,使用反射后电离激光.
- 在基于MALDI的质谱成像中实现更高的空间分辨率.
- 整合实时显微镜成像与MSI进行增强样本分析.
主要方法:
- 通过结合反射后电离激光来增加激光羽毛相互作用时间,开发了MALDI-2+.
- 在反射几何学MALDI中设计了一个T形离子导向器,用于垂直消光激光的发生率.
- 使用2.5微米激光点径实现高空间分辨率的MSI.
- 集成实时向后显微镜成像与MSI设置.
主要成果:
- 与传统的MALDI-2相比,MALDI-2+显示了超过2倍的灵敏度改善.
- 实现了高空间分辨率的MSI,具有10微米以下像素的潜力.
- 启用实时,高质量的显微镜成像,与MSI数据注册.
- 成功分析了标准样品和成像细胞,展示了系统的功能.
结论:
- 开发的MALDI-2+方法显著提高了对代谢物分析的灵敏度.
- 新的离子源设计可实现更高的空间分辨率MSI.
- 集成显微镜成像提供实时样品监测和记录.
- 这种综合方法提高了空间空间学研究的能力.
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