TY - RPRT TI - I have been using electrospray ionization-mass spectromatory in my chromatography methods development laboratory for about 8 years by itself and in combination with high-performance liquid chromatography. I have noticed significant differences in the spectra obtained on or compared to past results. Could you make a few comments concerning these observations? PY - 2004 UR - https://pubmed.ncbi.nlm.nih.gov/15693194/ ID - 15693194 ER -