For total curcuminoids, only three of thirteen samples contained less than 5% w/w dried powder, which is within the recommended amount by THP. Samples from the South contained the highest contents (average 8.99 ± 0.83% w/w), while those from the North contained the lowest contents (average 4.80 ± 1.83% w/w; Table 1).
In this study, the limit of volatile oil in all turmeric samples was in the range of 6–10%v/w and the limit of total curcuminoids was 3–10% dry weight. The results show that 77% of all samples passed the standardized limits of volatile oil and total curcuminoids according to THP and the Standard of ASEAN Herbal Medicine.