PL
Określono optymalne warunki oznaczania aflatoksyny M\ wlntefai. Zbadano przebieg ekstrakcji, oczyszczania ekstraktów, tworzenia pochodnej acetalowej aflatoksyny z kwasem trifluorooctowym oraz wysokosprawnej chromatografii cieczowej. Średni odzysk metody w zależności od poziomu fortyfikacji wynosił 62-67%, granica oznaczalności 0,01 fig aflatoksyny M\ w litrze mleka.
EN
The aim of this study was to perform a optimized method for determination of aflatoxin Mi in milk. The manner of extraction and clean-up of milk extracts as well conditions of reaction of aflatoxin Mi with TFA and HPLC was described. The main steps of optimized method were: extraction of samples with chloroform, clean-up of extracts on SPE Ci8 columns and by means of extraction with n-hexane, derivatisation of aflatoxin Mi with TFA (60°C, 6 minutes) to acetal form - aflatoxin M2a and determination of aflatoxin by means of the RP-HPLC technique. The mobile phase was a mixture of methanol, isopropanol and water (18+7+75). Fluorometric detection was made at 370/418-700 nm. The mean recovery of aflatoxin Mi dependent on fortification level was 62-67%, limit of detection was 0,01 fig/1 of milk.