“…Special attention has been focussed on polynuclear carbonyl compounds (1767), anthraquinones (379,539,1185,1340,1570,2243), naphthoquinones (426), benzoquinones (1543), lipoquinones (466), 1,3-indanediones (697, 1076), and cinnamaldehyde (149). 2,4-Dinitrophenylhydrazones have also been chromatographed on partition columns (553, 970), and frontal analysis was used to determine furfural (980).…”