Table 2.
Contents (µg/g DW) of individual phenolic compounds in okra fruits at different maturation stages
| Peak | Phenolic compounds (µg/g DW) | Stages | |||||
|---|---|---|---|---|---|---|---|
| 4 DPA | 5 DPA | 6 DPA | 7 DPA | 8 DPA | 9 DPA | ||
| 1 | Protocatechuic acid | 107.67 ± 0.37b | 114.77 ± 0.35a | 97.36 ± 0.44c | 89.74 ± 0.28d | 83.13 ± 0.33e | 64.13 ± 0.34f |
| 2 | Catechin | N.D. | N.D. | N.D. | N.D. | N.D. | N.D. |
| 2a | Catechin derivative | 157.64 ± 0.34e | 277.85 ± 0.40b | 284.92 ± 0.44a | 226.00 ± 0.42c | 226.22 ± 0.43c | 216.63 ± 0.30d |
| 3 | Caffeic acid | N.D. | N.D. | N.D. | N.D. | N.D. | N.D. |
| 4 | Quercetin-3-O-gentiobioside | 625.09 ± 0.44f | 1028.27 ± 0.37e | 1359.04 ± 0.36a | 1178.42 ± 0.45b | 1167.71 ± 0.45c | 1044.40 ± 0.23d |
| 5 | Rutin | 23.19 ± 0.25f | 38.40 ± 0.37e | 52.86 ± 0.33a | 44.81 ± 0.39b | 43.66 ± 0.33c | 40.01 ± 0.38d |
| 6 | Isoquercitrin | 647.05 ± 0.33e | 905.45 ± 0.46a | 812.35 ± 0.37b | 806.55 ± 0.42c | 721.72 ± 0.62e | 551.23 ± 0.42f |
| 7 | Quercetin | N.Q. | N.Q. | N.Q. | N.Q. | N.Q. | N.Q. |
| 7a | Quercetin derivative | 181.45 ± 0.59e | 278.84 ± 0.42a | 255.03 ± 0.35b | 252.46 ± 0.53c | 226.33 ± 0.15d | 176.59 ± 0.37f |
| Total | 1743.55 | 2646.37 | 2864.79 | 2600.23 | 2471.00 | 2093.76 | |
N.D.: the compound can not be detected; N.Q.: the amount is not available for quantification
Each value represents the mean ± standard deviation. Content of catechin derivative was expressed as catechin equivalents, and content of quercetin derivative was expressed as quercetin equivalents
Significant (p < 0.05) differences are shown by data bearing different letters (a–f)
The peaks were the same as in Fig. 2