Table 1.
Identified polyphenol compounds, total phenolics, and condensed tannins in four sorghum genotypes.
| Compound | Peak Number | Wavelength (nm) | Retention Time (min) | PI570481 | SC84 | Sumac | White |
|---|---|---|---|---|---|---|---|
| Caffeic acid | 1 | 320 | 8.64 ± 0.05 | ND† | ND† | ND† | 9.84 ± 0.04 |
| p-Coumaric acid | 2 | 320 | 13.43 ± 0.07 | 50.23 ± 0.33 | ND† | ND† | ND† |
| Ferulic acid | 3 | 320 | 16.06 ± 0.08 | 15.70 ± 1.71 | ND† | ND† | ND† |
| Luteolinidin | 4 | 280 | 18.40 ± 0.50 | 607.61 ± 145.21 | ND† | 22.15 ± 3.20 | ND† |
| Apigenidin | 5 | 280 | 21.32 ± 0.40 | 103.45 ± 19 | 82.96 ± 8.37 | ND† | ND† |
| 7-methoxy apigenidin | 6 | 320 | 24.03 ± 0.29 | 226.74 ± 20.72 | ND† | ND† | ND† |
| Eriodictyol | 7 | 280 | 28.23 ± 0.26 | 148.42 ± 95 | 483.77 ± 32.24 | 39.98 ± 2.40 | NQ‡ |
| Luteolin | 8 | 280 | 30.69 ± 0.30 | 128.06 ± 4.35 | 68.78 ± 1.05 | 57.01 ± 0.48 | 16.15 ± 0.34 |
| Naringenin | 9 | 280 | 33.48 ± 0.05 | 32.74 ± 0.75 | 98.78 ± 2.48 | 15.32 ± 0.48 | 1.94 ± 0.13 |
| Apigenin | 10 | 320 | 35.55 ± 0.06 | NQ‡ | NQ‡ | 33.52 ± 0.05 | NQ‡ |
| Kaempferol | 11 | 320 | 36.12 ± 0.13 | 35.36 ± 0.06 | ND† | 12.52 ± 0.03 | ND† |
| Total polyphenols mg GAE/g * | 38.11 ± 1.38 | 55.57 ± 4.78 | 12.4 ± 0.67 | 0.67 ± 0.88 | |||
| Condensed Tannins mg CE/g # | 179.01 ± 20.99 | 415.83 ± 89.61 | 13.03 ± 0.27 | ND |
* Measured by Folin–Ciocalteu assay. # Measured by Vannillin assay. ND†—Non-detected, under the Limit of Detection and equipment used. NQ‡—Detected but not quantified. Limit of Quantification below 0.0002 mg/mL.