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oxidation of the l-ascorbic acid to dehydroascorbic acid
oksidacija l-askorbinske kisline v dehidroaskorbinsko kislino
Ultimo aggiornamento 2014-10-18
Frequenza di utilizzo: 2
Qualità:
the concentration of l-ascorbic acid + dehydroascorbic acid in the wine is expressed in milligrams per litre.
koncentracijo l-askorbinske kisline + dehidroaskorbinske kisline v vinu izrazimo v miligramih na liter.
the methods proposed enable the l-ascorbic acid and dehydroascorbic acid present in wines or musts to be determined.
s spodnjimi metodami lahko določimo l-askorbinsko kislino in dehidroaskorbinsko kislino v vinu ali moštu.
a control test in the presence of boric acid enables spurious fluorescence to be determined (by the formation of a boric acid/dehydroascorbic acid complex) and the fluorimetric determination to be deduced.
s kontrolnim testom v navzočnosti borove kisline lahko določimo lažno flourescenco (tvorba borove kisline/kompleksa dehidroaskorbinske kisline) in opravimo fluorimetrično določitev.
on this line, find the value relative to the determination and thus deduce the concentration c l-ascorbic acid + dehydroascorbic acid in the solution to be analysed.
na tej črti poiščemo vrednost, ki pomeni določitev, in izpeljemo koncentracijo c l-askorbinske kisline + dehidroaskorbinske kisline v raztopini za analizo.
find the value of the absorbence measured in 3.3.3 on the straight calibration curve and thus determine the concentration of l-ascorbic acid + dehydroascorbic acid in the solution to be analysed.
na ravni umeritveni krivulji poiščemo vrednost absorpcije, izmerjene v 3.3.3, in tako določimo koncentracijo l-askorbinske kisline + dehidroaskorbinske kisline v raztopini za analizo.
this method makes it possible to determine the total quantity of ascorbic and dehydroascorbic acids (vitamin c) in feedingstuffs, concentrates and premixes.
ta metoda omogoča določitev skupne vsebnosti askorbinske in dehidroaskorbinske kisline (vitamina c) v krmi, koncentratih in premiksih.
the aqueous phase is treated with a solution of 2,6-dichlorophenol-indophenol in order to transform the ascorbic acid into dehydroascorbic acid, and then with a solution of 2,4-dinitrophenylhydrazine.
vodna faza se najprej obdela z raztopino 2,6-diklorofenolindofenola, da se askorbinska kislina pretvori v dehidroaskorbinsko kislino, nato pa še z raztopino 2,4-dinitrofenilhidrazina.
the member states shall require that analyses for official controls of feedingstuffs as regards their contents of retinol (vitamin a), thiamine (aneurine, vitamin b1), ascorbic and dehydroascorbic acids (vitamin c be carried out according to the methods described in annex ii to this directive.
države članice zahtevajo, da se analize za uradni nadzor krme v zvezi z vsebnostjo retinola (vitamina a), tiamina (anevrina, vitamina b1), askorbinske in dehidroaskorbinske kisline (vitamina c) izvajajo v skladu z metodami, opisanimi v prilogi ii k tej direktivi.
