“…A study was carried out to isolate 2,2 -dipyridyl from overheated, brewed coffee using a gas chromatography-mass spectroscopy (GC/MS) analysis [15]. Another study, using a mass spectrometric method, was able to isolate and identify 2,2 -dipyridyl in a hexane extract of human feces [16]. Other work has described the isolation 2,2 -dipyridyl from the high boiling point fraction of cigarette smoke condensate [17], and from the thermal degradation products of nicotine in a combustion tube [18].…”