18 commercial apple juices were obtained from local supermarkets
and of these 8 juices were declared to be made from
concentrate (three from organically grown apples, five from
conventionally grown apples) and 10 were declared to be made not
from concentrate (two from organically grown apples, eight from
conventionally grown apples). In addition one commercial apple
juice (not from concentrate, made from conventionally grown apples),
declared to be added AA, was analysed.
AA, 2,6-dichloroindophenol, sodium bicarbonate and oxalic acid
were obtained from Sigma Aldrich, Brøndby, Denmark.