共查询到4条相似文献,搜索用时 0 毫秒
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do Nascimento CA Lião LM Kato L da Silva CC Tanaka CM Schuquel IT de Oliveira CM 《Carbohydrate research》2008,343(6):1104-1107
A new tetrahydro beta-carboline alkaloid that has an oligosaccharide unit was isolated from the root extracts of the Palicourea coriacea. The structure was elucidated using spectral methods, including 2D NMR: COSY, HMQC, HMBC and NOESY. 相似文献
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Rachel V. Bennet Chaminda M. Gamage Facundo M. Fernández 《Journal of visualized experiments : JoVE》2013,(77)
Mass spectrometry imaging (MSI) provides untargeted molecular information with the highest specificity and spatial resolution for investigating biological tissues at the hundreds to tens of microns scale. When performed under ambient conditions, sample pre-treatment becomes unnecessary, thus simplifying the protocol while maintaining the high quality of information obtained. Desorption electrospray ionization (DESI) is a spray-based ambient MSI technique that allows for the direct sampling of surfaces in the open air, even in vivo. When used with a software-controlled sample stage, the sample is rastered underneath the DESI ionization probe, and through the time domain, m/z information is correlated with the chemical species'' spatial distribution. The fidelity of the DESI-MSI output depends on the source orientation and positioning with respect to the sample surface and mass spectrometer inlet. Herein, we review how to prepare tissue sections for DESI imaging and additional experimental conditions that directly affect image quality. Specifically, we describe the protocol for the imaging of rat brain tissue sections by DESI-MSI. 相似文献
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Ji‐Xin Tian Yuan Tian Lei Xu Ji Zhang Tao Lu Zun‐Jian Zhang 《Phytochemical analysis : PCA》2014,25(1):36-44