furfural is a constituent of fusel oil, which is so much dreaded in poor whisky.
(b) Yield of furfural from cellulose, oxy- and hydro-cellulose.
Gluconic acid distilled with hydrochloric acid gave traces of furfural; so also with sulphuric acid and manganic oxide.
The proportion of furfural obtained amounts to 3-4 per cent.
(e) Molisch's reaction for furfural will be shown by those proteins which contain a carbohydrate group.
The residues were found to yield considerable proportions of furfural.
The cupric reduction falls in greater ratio to the original (unfermented) than the furfural.
Thus, notably in regard to furfural yielding constituents, the latter yield 1-2 p.ct.
But the most characteristic feature is the high yield of furfural on boiling with condensing acids.
The distillates were collected in successive fractions, and the furfural and volatile acid determined.