Abstract: The present application concerns a process for quantifying polysorbates in a sample by implementing a LC-MS analysis with an internal standard, and the process for monitoring degradation of polysorbates in such sample.

Abstract: The present application concerns a process for quantifying polysorbates in a sample by implementing a LC-MS analysis with an internal standard, and the process for monitoring degradation of polysorbates in such sample.

Abstract: A micro-fabricated chromatography column (70) which is particularly well-suited to the surface well-site and/or the downhole analysis of subterranean reservoir fluids in oilfield or gasfield applications (but which may also be used in non-oilfield or non-gasfield situations) is described. This micro-fabricated column integrates a micro-structured substrate (50), such as a silicon substrate, with a stationary phase material (66) deposited by sputtering as a coating in a microchannel (56) in the substrate (50). Benefits of the presently claimed and disclosed inventive concept(s) include enhanced separation of alkanes and isomers, particularly below hexane (i.e., below C6 as well as the separation of carbon dioxide, hydrogen sulfide, and water and other substances present in reservoir fluids, such as natural gas.