Jinmei Xia

4 Questions 13 Answers 0 Followers

Questions related from Jinmei Xia

Is it normal for a compound to possess more than one CCS?

I was evaluating the collision cross section (CCS) values for various compounds using traveling wave ion mobility spectrometry (TWIMS). Quite beyond my expectation, some compounds seem to possess...

31 December 2021 6,663 10 View

How can one choose proper QC samples during metabolomics research?

I am curious about how to find proper compounds for Quality Control. When you do metabolomics research, usually you have many samples. There are different kinds of samples such as controls and...

02 January 2015 1,945 4 View

Why is it so hard to fragment certain ions during MSMS analysis?

I am analyzing some peptides and three peaks were detected. For each peak there were two main ions. Their m/z are 566.4300 with 588.4109, 679.5060 with 701.4924, and 792.5989 with 814.5800,...

01 December 2014 9,504 15 View

Can I use NMR spectrometer to analyze a sample with high temperature?

I am analyzing a carbohydrate and I am trying to do the analysis under different temperatures, hoping to capture conformational isomerism. The sample is about 60 degree centigrade and the solvent...

14 July 2014 6,119 22 View