Effect of Different Commercial Fertilizers, Harvest Date, and Storage Time on Two Organically Grown Blackberry Cultivars: Physicochemical Properties, Antioxidant Properties, and Sugar Profiles
Table 2
Antioxidant capacity of “Obsidian” and “Triple Crown” blackberry cultivars at harvest (2012 harvest).
Fish emulsion/hydrolysate blend
Soy meal
Processed poultry litter
DPPH (mg AAE/g)
Obsidian
Early harvest
A8.44 ± 0.75a
A8.77 ± 0.52a
A7.78 ± 0.21a
Middle harvest
A9.94 ± 1.04a
A10.84 ± 0.13b
A9.26 ± 0.15b
Late harvest
A10.01 ± 0.31a
A 9.20 ± 0.90a
A 8.98 ± 0.11c
Triple crown
Early harvest
A6.96 ± 0.29a
A6.63 ± 1.18a
A6.68 ± 0.06a
Middle harvest
A6.61 ± 0.28a
A7.61 ± 0.58a
A7.98 ± 0.12b
Late harvest
A7.70 ± 0.68a
A6.80 ± 0.47a
A6.63 ± 0.05c
ORAC (μmol TE/g)
Obsidian
Early harvest
A289.52 ± 22.57a
B427.86 ± 27.86a
B392.54 ± 0.11a
Middle harvest
A380.48 ± 9.79b
B501.69 ± 0.51b
A416.80 ± 0.19b
Late harvest
A763.73 ± 18.39c
B717.15 ± 55.05c
C591.50 ± 0.16a
Triple crown
Early harvest
A467.42 ± 36.00a
A446.88 ± 5.89a
A427.55 ± 0.08a
Middle harvest
A362.66 ± 12.78b
B403.50 ± 12.65b
A387.89 ± 0.04a
Late harvest
A253.09 ± 5.69c
A268.04 ± 24.43c
A253.71 ± 0.05b
FRAP (μmol Fe2+/g)
Obsidian
Early harvest
A753.51 ± 0.06a
A791.71 ± 0.00a
A767.75 ± 6.60a
Middle harvest
A596.05 ± 60.21b
B727.32 ± 11.85b
A649.29 ± 2.05b
Late harvest
A709.10 ± 6.39a
A680.87 ± 34.27b
B622.75 ± 5.66b
Triple crown
Early harvest
A521.53 ± 4.35a
B588.15 ± 3.04a
A534.38 ± 1.06a
Middle harvest
A489.67 ± 3.06b
B548.21 ± 13.17b
C600.98 ± 9.18b
Late harvest
A646.48 ± 13.73c
B574.66 ± 10.10a
B559.62 ± 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).