Greatest quantitative differences were observed between the
AOAC method and the HPLC method, the later one being in average
27% lower. The new methods studied was in closer agreement
with the AOAC methods (lower by 7% on average) and still in
average 22% higher than the HPLC method. Thus, for both spectrophotometric
methods the greatest differences were observed
with the HPLC method indicating that the major reason lies in
the quantification difference rather than in differences with
regard to extraction because the amount of sample took as per
recommended for complete extraction (Schweigert, Schierle, &