Journal of Food Quality

Research Article

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 ± 0.75^a	A8.77 ± 0.52^a	A7.78 ± 0.21^a
Middle harvest	A9.94 ± 1.04^a	A10.84 ± 0.13^b	A9.26 ± 0.15^b
Late harvest	A10.01 ± 0.31^a	A 9.20 ± 0.90^a	A 8.98 ± 0.11^c
Triple crown
Early harvest	A6.96 ± 0.29^a	A6.63 ± 1.18^a	A6.68 ± 0.06^a
Middle harvest	A6.61 ± 0.28^a	A7.61 ± 0.58^a	A7.98 ± 0.12^b
Late harvest	A7.70 ± 0.68^a	A6.80 ± 0.47^a	A6.63 ± 0.05^c

ORAC (μmol TE/g)
Obsidian
Early harvest	A289.52 ± 22.57^a	B427.86 ± 27.86^a	B392.54 ± 0.11^a
Middle harvest	A380.48 ± 9.79^b	B501.69 ± 0.51^b	A416.80 ± 0.19^b
Late harvest	A763.73 ± 18.39^c	B717.15 ± 55.05^c	C591.50 ± 0.16^a
Triple crown
Early harvest	A467.42 ± 36.00^a	A446.88 ± 5.89^a	A427.55 ± 0.08^a
Middle harvest	A362.66 ± 12.78^b	B403.50 ± 12.65^b	A387.89 ± 0.04^a
Late harvest	A253.09 ± 5.69^c	A268.04 ± 24.43^c	A253.71 ± 0.05^b

FRAP (μmol Fe²⁺/g)
Obsidian
Early harvest	A753.51 ± 0.06^a	A791.71 ± 0.00^a	A767.75 ± 6.60^a
Middle harvest	A596.05 ± 60.21^b	B727.32 ± 11.85^b	A649.29 ± 2.05^b
Late harvest	A709.10 ± 6.39^a	A680.87 ± 34.27^b	B622.75 ± 5.66^b
Triple crown
Early harvest	A521.53 ± 4.35^a	B588.15 ± 3.04^a	A534.38 ± 1.06^a
Middle harvest	A489.67 ± 3.06^b	B548.21 ± 13.17^b	C600.98 ± 9.18^b
Late harvest	A646.48 ± 13.73^c	B574.66 ± 10.10^a	B559.62 ± 5.37^c

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).