Advanced Chemical Ionization Gas Reagents for Mass Spectroscopy

Aug 07, 2023

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Explore the advanced chemical ionization gas reagents in mass spectroscopy, such as YHn, YHn+, YHn-, MH+, and more. Understand the positive and negative ionization reactions and their thermodynamic properties. Learn about Proton Affinities (PA) of common CI reagents gases and their applications in analyzing substances like glycos steroids and peptides.

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Advanced Chemical Ionization Gas Reagents for Mass Spectroscopy

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Mass Spectroscopy Advanced

Chemical Ionization (CI) gas pereaksi YHn YHn+ YHn-1 + MH+ + H1 (CI positif) M Y - YH + [M – H ]- + H2 (CI negatif) substrat H  positif (eksotermik) H1 = PA (YHn-1) - PA (M) H2 = PA (M – H)- - PA (Y- )
Proton Affinities (PA) of Common CI Reagents Gases

Glicosteroid (MW 548) with ammonia as reagent CI DCI
Puncak2 matriks sehubungan dengan FAB (ion positif) * Campuran ditiotreitol dan ditioeritritol (5 : 1)
Dipeptida (MW 212)