Table 4.

Volatile organic compounds in bryndza cheese determined by electronic nose (e-nose) with D > 0.900.

Volatile Organic Compounds		Kovats´ Retention Index DB-5 Column	Kovats´ Retention Index DB-1701 Column	Sensory Descriptor 1
Ketones	2-butanone	594	690	butter, cheese, chemical, chocolate, ethereal, gaseous
	2,3-butanonedione	589	690	butter, caramelized, creamy, fruity, pineapple, spirit
Aldehyde	propanal	489	579	ethereal, plastic, pungent, solvent
	butanal	578	668	chocolate, green, malty, pungent
	heptanal	901	986	citrus, fatty, fruity, green, smoky
	2-methyl propanal	522	626	brunt, fruity, green, toasted, spicy, malty, pungent
	furfural	836	978	almond, bread, sweet
Esters	ethyl acetate	614	677	acidic, butter, caramelized, fruity, orange, pineapple, pungent, solvent, ethereal, sweet
	butyl acetate	813	879	banana, bitter, ethereal, green, strong, fruity, pear, pineapple, sweaty, sweet
	ethyl butanoate	800	865	acetone, banana, bubblegum, caramelized, fruity, pineapple, strawberry, sweet
	isoamyl acetate	876	945	banana, fresh, fruity, pear, sweet
	ethyl propanoate	710	766	acetone, fruity, solvent
	methyl 2-methyl butanoate	774	840	apple, chewing gum, fruity, solvent, spirit
Alcohols	2-methyl propanol	626	736	alcoholic, bitter, chemical, glue, leek, lecorice, solvent, winey
	2-propanol	500	602	alcoholic, ethereal
	n–butanol	664	779	cheese, fermented, fruity, medicinal
	1-hexanol	868	980	dry, floral, fruity, grassy, green, herbaceous, mild woody
Free Fatty Acids	propanoic acid	739	889	acidic, pungent, rancid, soy
	hexanoic acid	996	1186	cheese, fatty, goat, pungent, rancid, sweaty
Monoterpenes	limonene	1049	1073	citrus, fruity, minty, orange, peely

¹ Sensory descriptor from AroChemBase database, part of software Alpha Soft V14 (Alpha M.O.S.).