Table 5.
Identification and quantification of cinnamic acids and derivatives and flavonoid composition of purple-coloured sweet potato (Ipomoea batatas L.) genotypes found in Sub-Saharan Africa by UPLC–QTOF/MS.
| RT | [M-H]− (m/z) | MSE Fragments | Molecular Formula | Tentative Identification | Sweet Potato Genotypes (Roots) | |||
|---|---|---|---|---|---|---|---|---|
| ‘16-283P’ | ‘08-21P’ | ‘2019-1-1′ | Purple-purple | |||||
| Concentrations of cinnamic acids and derivatives in mg/kg | ||||||||
| 4.44 | 353.087 | 135.043 179.034 191.055 201.016 |
C16H18O9 | Chlorogenic acid 3CQA 3-O-Caffeoylquinic acid |
246.26 a ± 3.54 | 118.81 d ± 1.81 | 147.41 c ± 3.22 | 198.26 b ± 1.19 |
| 5.29 | 707.182 | 135.043 161.022 179.034 191.055 353.088 707.183 |
C16H18O9 | Chlorogenic acid 3CQA 3-O-Caffeoylquinic acid |
2201.27 b ± 2.02 | 450.30 c ± 2.25 | 670.03 c ± 2.37 | 3032.33 a ± 1.46 |
| 5.29 | 353.087 | 135.043 161.023 179.034 191.055 353.088 |
C16H18O9 | Chlorogenic acid 5CQA 5-O-Caffeoylquinic acid (Neochlorogenic acid) |
4354.93 a ± 1.66 | 2195.08 b ± 2.43 | 2178.12 b ± 2.60 | 4210.58 a ± 2.52 |
| 6.48 | 367.103 | 191.056 | C17H20O9 | 3-O-Caffeoyl-4-O-methylquinic acid (MCGA3) | 184.71 b ± 5.14 | 95.49 d ± 2.89 | 106.71 c ± 2.53 | 221.10 a ± 1.73 |
| 7.41 | 515.119 | 135.043 161.023 173.044 179.033 191.055 201.016 335.076 353.087 388.996 |
C25H24O12 | 1,3-Dicaffeoylquinic acid (1,3-diCQA) | 222.45 b ± 1.03 | 433.27 a ± 1.28 | 98.34 d ± 2.45 | 179.91 c ± 1.34 |
| 7.60 | 515.119 | 135.043 179.033 191.055 353.087 375.069 |
C25H24O12 | Dicaffeoylquinic acid isomer 1 diCQA |
10547.26 a ± 1.44 | 5420.71 b ± 1.98 | 3068.42 c ± 2.02 | 3467.92 c ± 3.07 |
| 8.04 | 515.119 | 173.044 191.054 353.088 375.070 |
C25H24O12 | Dicaffeoylquinic acid isomer 2 diCQA |
124.65 a ± 0.23 | 118.34 a ± 1.11 | 82.08 b ± 1.84 | 61.58 c ± 1.90 |
| 8.68 | 515.119 | 179.034 191.055 339.050 353.087 375.070 |
C25H24O12 | Dicaffeoylquinic acid isomer 3 diCQA |
18.08 a ± 1.10 | 11.48 b ± 0.88 | 7.19 c ± 0.20 | 6.33 c ± 0.49 |
| 8.89 | 529.136 | 367.104 375.167 397.146 519.331 |
C26H26O12 | 3,5-Dicaffeoylquinic methyl ester; (-)-3,5-Dicaffeoylquinic methyl ester 3,5-diCQA) |
22.13 a ± 1.01 | 14.76 b ± 0.86 | 6.66 c ± 0.32 | 9.43 c ± 3.44 |
| Concentrations of flavonoids in mg/kg | ||||||||
| 6.28 | 625.141 | 300.027 301.032 339.051 371.098 471.152 533.129 555.112 |
C27H30O17 | Quercetin 3,4′-diglucoside | 29.23 a ± 0.71 | 8.54 c ± 0.52 | 7.86 c ± 0.23 | 18.88 b ± 0.46 |
Means followed by the same letter within the row are not significantly different (p < 0.05); each of the samples was replicated three times, and the results are expressed as mean ± standard deviation.