Naslov
Utjecaj dušične gnojidbe na sastav indol-3-octene kiseline u vinu Graševina
(Nitrogen fertilizers and the indole-3-acetic acid levels in Italian riesling wine)

Autori
Karoglan, Marko ; Herjavec, Stanka ; Maslov, Luna ; Jeromel, Ana ; Kozina, Bernard

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
32nd world congress of vine and wine / - Zagreb : Ministarstvo poljoprivrede ribarstva i ruralnog razvoja RH, 2009, 1-7

ISBN
978-953-6718-12-2

Skup
32nd world congress of vine and wine

Mjesto i datum
Zagreb, Hrvatska, 28.06.2009. - 03.07.2009

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
indol-3-octena kiselina; L-triptofan; vino; dušična gnojidba
(indole-3-acetic acid; L- tryptophan; wine; nitrogen fertilizers)

Sažetak
The phenomenon of untypical aging off-flavor, which is associated with higher concentrations of 2-aminoacetophenone (2-AAP) in white wines, can stem from some technological treatments applied in grape and wine production. In order to find out if a wine is liable to untypical aging off-flavor, it is necessary to determine the concentrations of indole-3-acetic acid and L-tryptophan, which are the precursors of 2- aminoacetophenone. The purpose of this investigation was to ascertain the effect of nitrogen fertilizers during the production years 2006 and 2007 on the levels of L- tryptophan and indole-3-acetic acid in the wines of and Italian Riesling – Zagreb wine- growing region, Jazbina test plot. Nitrogen fertilizers in the form of urea were applied as follows: 0 kg/ha - K, 51 kg/ha (23 kg N/ha) – N1, 152 kg/ha (70 kg N/ha) –N2 and 254 kg/ha (117 kg N/ha) –N3. Grapes were harvested by treatments and each repetition within a treatment was separately vinified according to the technology customary for white wines. Young wine samples were taken for analysis immediately after completed alcoholic fermentation. The amino-acid composition of wine was determined by means of the liquid chromatography with fluorescence detection. The investigation included the development and validation of the method of determining the levels of indole-3-acetic acid, indole and skatole in wine by means of the liquid chromatography with fluorescence detection and a prior purification of samples by means of Solid Phase Extraction (SPE) on polystyrene columns. The efficiency and selectivity of two types of SPE columns were compared. The established differences in the levels of indole-3-acetic acid among individual treatments are not linked to the nitrogen fertilization.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA