Sample preparation and experimental details have been reported previously for 3-ring and 4-ring MDA ESI studies2 (link) and 2-ring MDA ESI and MALDI studies1 (link),3 (link), but a few details will be mentioned here. Methylenedianiline (MDA) 3-ring and 4-ring samples were provided by Dr. Stefan Wershofen (Bayer MaterialScience AG, 47812 Uerdingen, Germany). Optima grade methanol and water with 0.1% formic acid were obtained from Fisher Scientific (Waltham, MA, USA). Tetralkylammonium salts, α-cy-ano-4-hydroxycinnamic acid (CHCA) and alkali salts were obtained from Sigma-Aldrich (St. Louis, MO, USA). Samples were dissolved at a concentration of 1 mg/mL in 9:1 methanol/water containing 0.1% formic acid (v/v). Each MDA isomer was combined in a 10:1 CHCA matrix-to-analyte ratio and two or three layers of 0.5 µL of samples were spotted on a 100-well MALDI plate.
Alkali salts
Manufactured by Merck Group
Sourced in United States, Macao
Alkali salts are a group of inorganic compounds that are composed of a metallic element (such as sodium, potassium, or lithium) combined with a negatively charged ion (such as hydroxide or carbonate). They are commonly used in various laboratory applications and industrial processes.
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Lab products found in correlation
2 protocols using alkali salts
1
MDA Isomers Preparation and Analysis
2
Spectroscopic Characterization of MDA Isomers
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4,4′-MDA, 2,4′-MDA, and 2,2′-MDA
were provided by Dr. Stefan Wershofen, Bayer MaterialScience AG, 47812
Krefeld, Germany. Their authenticity was established by 13C and 1H NMR as shown in theSupporting
Information (Figures S-1 through S-6). Methanol and formic
acid were obtained from Sigma-Aldrich, USA. Alkali salts and tetralkylammonium
salts were obtained from Sigma-Aldrich (St. Louis, MO) with the exception
of sodium chloride (Thermo Fisher Scientific, Waltham, MA).
were provided by Dr. Stefan Wershofen, Bayer MaterialScience AG, 47812
Krefeld, Germany. Their authenticity was established by 13C and 1H NMR as shown in the
Information
acid were obtained from Sigma-Aldrich, USA. Alkali salts and tetralkylammonium
salts were obtained from Sigma-Aldrich (St. Louis, MO) with the exception
of sodium chloride (Thermo Fisher Scientific, Waltham, MA).
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