Methylpyridinium
Methylpyridinium is an ion with the formula. It is the N-methylated derivative of pyridine. It confers no color to its salts. The ion is classified as a quaternary ammonium ion.
Preparation and occurrence
Methylpyridinium is prepared by treating pyridine with dimethylsulfate:It is found in some coffee products. It is not present in unroasted coffee beans, but is formed during roasting from its precursor chemical, trigonelline.