Effect of dehydration by sun or by oven on volatiles and aroma compounds of Trachanas

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Table I.

Volatile odour active compounds in Trachanas by SPME and GC/MS/O detection.

Compounds	Chemical class	Type	Descriptor	LRI^{^a}	Ident^{^b}	Sun^{^c}	Oven^{^c}
NI	–	N	Mushroom	1033	–	x
NI	–	B	Rancid	1145	–	x
1-Octen-3-ol^{^*}	Alcohol	N	Mushroom up	940	MS, PI	x	x
Benzenethanol^{^*}	Alcohol	G	Floral	1070	MS	x
Cinnamyl alcohol	Alcohol	G	Oil, floral	1313	PI	x
Hexanal^{^*}	Aldehyde	G	Green up	761	MS, PI	x	x
2-Hexenal	Aldehyde	B	Rancid	860	PI	x
Octanal^{^*}	Aldehyde	G	Orange up	960	MS, PI	x	x
Benzaldehyde^{^*}	Aldehyde	G	Milk, honey	965	MS, PI	x
(E)-2-octenal^{^*}	Aldehyde	B	Fried oil	1013	MS	x	x
Nonanal	Aldehyde	G	Milk, burnt	1050	MS, PI	x	x
2-Octenal	Aldehyde	N	Nutty	1066	MS, PI	x
2,4-octadienal	Aldehyde	G	Green	1100	PI	x	x
(E)-2-nonenal^{^*}	Aldehyde	G	Green up	1105	MS, PI	x	x
(Z)-2-nonenal	Aldehyde	N	Hay up	1112	PI	x	x
(E,E)-2,4-nonadienal^{^*}	Aldehyde	B	Fried oil	1170	MS, PI	x	x
(E,E)-2,4-decadienal^{^*}	Aldehyde	B	Fried oil	1270	MS	x
Ethyl hexadecanoate	Ester	G	Cake	1342	MS	x
g-Hexalactone	Lactone	G	Sweet	1318	PI	x
Methional	Sulphur	B	Potato	867	PI	x	x
Methyl thiazoline	Sulphur	B	Garlic	928	PI		x
Linalool oxide	Terpene	G	Floral	1212	PI	x
Number of total compounds						21	11

LRI, linear retention index; HP-5 capillary column.

Identification, MS (Wiley library); PI (Internet Data Base: Flavornet).

Presence of compounds was assigned, when detected in both replicates.

Identification confirmed by Agilent 7890A GC/ 5975C MS; HP-5 capillary column.

NI, not identified; G, good notes; B, bad notes; N, not good, not bad notes.

According to Fisher’s exact test, the sun-dried Trachanas sample contained more G compounds compared to oven-dried (P < 0.01).