Precise Analytical Procedures for Compound Identification

All aqueous solutions were prepared with deionized water (Millipore Milli‐Q; Sigma Aldrich, St. Louis, MO, USA). LC‐MS‐Grade methanol (MeOH) and acetonitrile (ACN) were purchased from Honeywell (Charlotte, NC, USA). Formic acid (FA) for the electrospray was purchased from Fisher Scientific (Waltham, MA, USA). Caffeine, reserpine, and leucine enkephalin were purchased from Sigma Aldrich. ESI‐L Low Concentration Tuning Mix and 0.5 ml 96‐well plates were bought from Agilent Technologies (Santa Clara, CA, USA).

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Arciniega C., Garrard K.P., Guymon J.P., Manni JG S.r., Apffel A., Fjeldsted J.C, & Muddiman D.C. (2023). Quasi‐continuous infrared matrix‐assisted laser desorption electrospray ionization source coupled to a quadrupole time‐of‐flight mass spectrometer for direct analysis from well plates. Journal of Mass Spectrometry, 58(1), e4902.

Publication 2023

LC‐MS‐Grade methanol acetonitrile Caffeine reserpine leucine enkephalin ESI‐L Low Concentration Tuning Mix

Acetonitrile Caffeine Formic acid Leucine enkephalin Methanol Reserpine

Corresponding Organization : North Carolina State University

Other organizations : Agilent Technologies (United States)

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control variables

Deionized water (Millipore Milli‐Q; Sigma Aldrich, St. Louis, MO, USA) used for preparing all aqueous solutions
LC‐MS‐Grade methanol (MeOH) and acetonitrile (ACN) purchased from Honeywell (Charlotte, NC, USA)
Formic acid (FA) for the electrospray purchased from Fisher Scientific (Waltham, MA, USA)
Caffeine, reserpine, and leucine enkephalin purchased from Sigma Aldrich
ESI‐L Low Concentration Tuning Mix and 0.5 ml 96‐well plates bought from Agilent Technologies (Santa Clara, CA, USA)

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