Int J Anal Chem. 2015;2015:513761. doi: 10.1155/2015/513761. Epub 2015 Sep 13.
International journal of analytical chemistry
Mengrui Yang, Tatsuya Fujino
PMID: 26448749 PMCID: PMC4584054 DOI: 10.1155/2015/513761
α-Cyano-4-hydroxycinnamic acid (CHCA), an organic matrix molecule for matrix-assisted laser desorption/ionization mass spectrometry, was adsorbed to NH4 (+)-type zeolite surface, and this new matrix was used for the detection of low-molecular-weight compounds. It was found that this matrix could simplify the mass spectrum in the low-molecular-weight region and prevent interference from fragments and alkali metal ion adducted species. CHCA adsorbed to NH4 (+)-type ZSM5 zeolite (CHCA/NH4ZSM5) was used to measure atropine and aconitine, two toxic alkaloids in plants. In addition, CHCA/NH4ZSM5 enabled us to detect phosphorylated peptides; peaks of the protonated peptides had higher intensities than the peaks observed using CHCA only.