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• W1998533111 abstract "The performance of a prototype porous tip sprayer for sheathless capillary electrophoresis–mass spectrometry (CE–MS) of intact proteins was studied. Capillaries with a porous tip were inserted in a stainless steel needle filled with static conductive liquid and installed in a conventional electrospray ionization (ESI) source. Using a BGE of 100 mM acetic acid (pH 3.1) and a positively charged capillary coating, a highly reproducible and efficient separation of four model proteins (insulin, carbonic anhydrase II, ribonuclease A and lysozyme) was obtained. The protein mass spectra were of good quality allowing reliable mass determination of the proteins and some of their impurities. Sheath-liquid CE–MS using the same porous tip capillary and an isopropanol–water–acetic acid sheath liquid showed slightly lower to similar analyte responses. However, as noise levels increased with sheath-liquid CE–MS, detection limits were improved by a factor 6.5–20 with sheathless CE–MS. The analyte response in sheathless CE–MS could be enhanced using a nanoESI source and adding 5% isopropanol to the BGE, leading to improved detection limits by 50-fold to 140-fold as compared to sheath liquid interfacing using the same capillary – equivalent to sub-nM detection limits for three out of four proteins. Clearly, the sheathless porous tip sprayer provides high sensitivity CE–MS of intact proteins." @default.
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• W1998533111 date "2010-11-01" @default.
• W1998533111 modified "2023-10-18" @default.
• W1998533111 title "Performance of a sheathless porous tip sprayer for capillary electrophoresis–electrospray ionization-mass spectrometry of intact proteins" @default.
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• W1998533111 doi "https://doi.org/10.1016/j.chroma.2010.10.006" @default.
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