Research Article
Improvement of Analytical Methods for the Determination of
Polyphenolic Bioactive Compounds in Berry Fruits
Table 2
Content of flavonols in the traditional and ultrasonic extracts (results from 3 independent replicates).
| | Sample | Analyte | Methanolic extract | Methanolic extract with ultrasound treatment | Concentration
(mg 100 g−1 FW)a | RSD
(%) | Concentration
(mg 100 g−1 FW)a | RSD
(%) |
| | S1 (S. nigra) | Quercetin | 14.77 | 5.76 | 18.98 | 4.12 | | Kaempferol | n.d. | — | n.d. | — | | Myricetin | n.d. | — | n.d. | — | | S2 (S. nigra) | Quercetin | 12.32 | 6.04 | 16.07 | 3.88 | | Kaempferol | n.d. | — | n.d. | | | Myricetin | n.d. | — | n.d. | | | S3 (S. nigra) | Quercetin | 7.12 | 5.43 | 11.88 | 5.16 | | Kaempferol | n.d. | — | n.d. | — | | Myricetin | n.d. | — | n.d. | — |
| | M1 (R. ulmifolius) | Quercetin | n.d. | — | n.d. | — | | Kaempferol | 22.12 | 4.45 | 30.86 | 8.87 | | Myricetin | 10.74 | 7.55 | 14.34 | 5.23 | | M2 (R. ulmifolius) | Quercetin | n.d. | — | n.d. | — | | Kaempferol | 355.62 | 4.12 | 444.86 | 8.12 | | Myricetin | 146.42 | 7.71 | 200.25 | 7.16 | | M3 (R. procerus) | Quercetin | n.d. | — | n.d. | — | | Kaempferol | 18.71 | 3.45 | 23.84 | 11.32 | | Myricetin | 3.31 | 2.13 | 4.83 | 5.15 | | M4 (R. fruticosus) | Quercetin | n.d. | — | n.d. | — | | Kaempferol | 30.16 | 6.76 | 41.56 | 6.77 | | Myricetin | 1.12 | 7.72 | 1.56 | 8.15 |
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RSD: relative standard deviation; amean value; n.d.: not detected.
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