Plant Sample/ Commercial Products Analytes Serving size Servings/day Ave. wt of each capsule content/tablet (mg) C. longa L. (Amount, mg)/serving
1 2 3 4
CL-1 2.74 (0.16) 1.15 (0.19) 1.03 (0.24) 0.73 (0.12) - - - -
CL-2 0.75 (0.09) 0.25 (0.83) 0.16 (0.65) 1.32 (0.12) - - - -
CL-3 0.91 (0.29) 0.32 (0.79) 0.23 (0.41) 0.51 (0.71) - - - -
CZ 0.00031 (0.91) 0.003 (0.42) 0.00055 (0.26) ND - - - -
CP 0.0002 (2.13) 0.0004 (1.45) DUL ND - - - -
CW ND ND ND ND - - - -
CK ND ND ND ND - - - -
CLP-1 0.699 (0.23) 0.322 (0.09) 0.220 (0.13) 0.271 (0.16) 2 capsules 1 827.5 1440
CLP-2 1.186 (0.12) 0.405 (0.07) 0.305 (0.56) 0.632 (0.10) 1 capsule 1-3 798.2 250 mg extract +250 mg root
CLP-3 1.138 (0.04) 0.373 (0.21) 0.279 (0.08) 0.575 (0.03) 1 capsule 3-6 510.9 400
CLP-4 0.467 (0.12) 0.203 (0.097) 0.155 (0.04) 0.187 (0.06) 2 capsules 1 832.9 1440
CLP-5 10.848 (1.54) 2.845 (2.60) 0.913 (0.85) 1.100 (0.31) 2 capsules 2 528.9 350 mg rhizome + 100 mg extract
CLP-6 27.669 (0.17) 5.818 (2.15) 1.884 (1.78) 0.291 (0.53) 1 tablet 3 911.9 450


DUL = Detected under limits of quantification
ND = Not Detected
Mean (n=3) ± relative standard deviation (% CV) are given in parentheses.
Table 3:Content (%, w/w) of curcumins in Curcuma samples (mg/100 mg dried material) and dietary supplements (mg/average wt of capsule) using UPLC-UV method: curcumin (1), desmethoxycurcumin (2), bisdesmethoxycurcumin (3) and ar-turmerone (4).