his paper described a modified HPLC method for the determination of eight acylated anthocyanins in purple-fleshed sweet potato tuber samples, including lyophilized powder and concentrated juice. Recoveries determined for two materials spiked with anthocyanin levels of 71 mu g g(-1) to 8.8 mg g(-1) ranges 91.8 - 105.0%. For repeatability, the relative standard deviation and intermediate precision ranged from 0.8% to 5.0% and 1.9% to 8.2%, respectively. HorRat values ranged from 0.3 to 1.0, except for YGM-1a and YGM-1b in two samples, which were well within the limits of performance acceptability. The proposed method showed good intralaboratory reproducibility in the range from 0.10 +/- 0.0027 (mean +/- expanded measurement uncertainty, k = 2) to 0.51 +/- 0.016, 0.10 +/- 0.0084 to 0.21 +/- 0.011, 0.40 +/- 0.017 to 4.5 +/- 0.12, 0.21 +/- 0.0066 to 0.96 +/- 0.021, 0.23 +/- 0.014 to 0.57 +/- 0.026, 0.15 +/- 0.0087 to 1.3 +/- 0.040, 0.94 +/- 0.021 to 6.5 +/- 0.19, and 0.63 +/- 0.016 to 2.4 +/- 0.061 mg g(-1) for YGM-1a, YGM-1b, YGM-2, YGM-3, YGM-4b, YGM-5a, YGM-5b, and YGM-6, respectively.
