In the very first complete study on the occurrence of OTA in
wines, Zimmerly and Dick (1996) reported a higher amount of OTA
in special wines than in dry wines. In the special wines they also
reported an average contamination of 0.29 mg L1 of OTA in Malaga
wine (Spanish origin) that was higher with respect to the other
fortified special wines investigated like Porto, Sherry, Marsala and
Vermouth, with OTA levels of 0.011, 0.042, 0.191 and