ELECTROSPRAY IONIZATION MASS SPECTROMETRY
\ɪlˌɛktɹə͡ʊspɹˈe͡ɪ ˌa͡ɪəna͡ɪzˈe͡ɪʃən mˈas spɛktɹˈɒmətɹi], \ɪlˌɛktɹəʊspɹˈeɪ ˌaɪənaɪzˈeɪʃən mˈas spɛktɹˈɒmətɹi], \ɪ_l_ˌɛ_k_t_ɹ_əʊ_s_p_ɹ_ˈeɪ ˌaɪ_ə_n_aɪ_z_ˈeɪ_ʃ_ə_n m_ˈa_s s_p_ɛ_k_t_ɹ_ˈɒ_m_ə_t_ɹ_i]\
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A mass spectrometry technique used for analysis of nonvolatile compounds such as proteins and macromolecules. The technique involves preparing electrically charged droplets from analyte molecules dissolved in solvent. The electrically charged droplets enter a vacuum chamber where the solvent is evaporated. Evaporation of solvent reduces the droplet size, thereby increasing the coulombic repulsion within the droplet. As the charged droplets get smaller, the excess charge within them causes them to disintegrate and release analyte molecules. The volatilized analyte molecules are then analyzed by mass spectrometry.
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