Table 2: Antioxidant capacity of “Obsidian” and “Triple Crown” blackberry cultivars at harvest (2012 harvest).

Fish emulsion/hydrolysate blendSoy mealProcessed poultry litter

DPPH (mg AAE/g)
 Obsidian
  Early harvestA8.44 ± 0.75aA8.77 ± 0.52aA7.78 ± 0.21a
  Middle harvestA9.94 ± 1.04aA10.84 ± 0.13bA9.26 ± 0.15b
  Late harvestA10.01 ± 0.31aA 9.20 ± 0.90aA 8.98 ± 0.11c
 Triple crown
  Early harvestA6.96 ± 0.29aA6.63 ± 1.18aA6.68 ± 0.06a
  Middle harvestA6.61 ± 0.28aA7.61 ± 0.58aA7.98 ± 0.12b
  Late harvestA7.70 ± 0.68aA6.80 ± 0.47aA6.63 ± 0.05c

ORAC (μmol TE/g)
 Obsidian
  Early harvestA289.52 ± 22.57aB427.86 ± 27.86aB392.54 ± 0.11a
  Middle harvestA380.48 ± 9.79bB501.69 ± 0.51bA416.80 ± 0.19b
  Late harvestA763.73 ± 18.39cB717.15 ± 55.05cC591.50 ± 0.16a
 Triple crown
  Early harvestA467.42 ± 36.00aA446.88 ± 5.89aA427.55 ± 0.08a
  Middle harvestA362.66 ± 12.78bB403.50 ± 12.65bA387.89 ± 0.04a
  Late harvestA253.09 ± 5.69cA268.04 ± 24.43cA253.71 ± 0.05b

FRAP (μmol Fe2+/g)
 Obsidian
  Early harvestA753.51 ± 0.06aA791.71 ± 0.00aA767.75 ± 6.60a
  Middle harvestA596.05 ± 60.21bB727.32 ± 11.85bA649.29 ± 2.05b
  Late harvestA709.10 ± 6.39aA680.87 ± 34.27bB622.75 ± 5.66b
 Triple crown
  Early harvestA521.53 ± 4.35aB588.15 ± 3.04aA534.38 ± 1.06a
  Middle harvestA489.67 ± 3.06bB548.21 ± 13.17bC600.98 ± 9.18b
  Late harvestA646.48 ± 13.73cB574.66 ± 10.10aB559.62 ± 5.37c

DPPH: radical scavenging activity by the 2,2-diphenyl-1-picrylhydrazyl colorimetric method; ORAC: oxygen radical absorbance capacity; FRAP: ferric-reducing antioxidant power. Mean values ± SD, n = 3. Mean values ± SD, n = 2. Values preceded with the same capital letters (A–C) within the same row of a given table are not statistically different (α ≤ 0.05). Within a given cultivar and antioxidant method, values followed with the same lowercase letters (a–c) within the same column of a given table are not statistically different (α ≤ 0.05).