Table 1.
HPLC analysis of phenolic contents in blueberry extracts.
| Phenolics | Regression equation | r | Linear range (mg/L) | RSD/% (n = 3) | LOD (mg/L) | Blueberry extracts (mg/g) |
|---|---|---|---|---|---|---|
| Gentisic acid | y = 8,435x + 9.9639 | 0.999 8 | 2.58~42.6 | 1.732 | 0.420 | 0.18 |
| Chlorogenic acid | y = 23,250x − 27.688 | 0.999 4 | 3.26~ 37.4 | 2.20 | 0.48 | 0.85 |
| (2)-epicatechin | y = 25,734x + 0.622 | 0.999 3 | 2.43~41.5 | 3.22 | 0.35 | 0.26 |
| p-coumaric acid | y = 63,528x − 55.559 | 0.999 9 | 3.21~52.5 | 1.55 | 0.61 | 0.72 |
| Benzoic acid | y = 12,723x − 6.7917 | 0.999 6 | 1.56~52.0 | 3.56 | 0.26 | 0.66 |
| p-anisic acid | y = 58,236x − 41.969 | 0.999 2 | 2.70~46.0 | 1.28 | 0.50 | 0.41 |
| Quercetin | y = 69,496x − 45.792 | 0.998 7 | 1.40~47.5 | 0.42 | 0.23 | 1.92 |
r, correlation coefficient; RSD, relative standard deviation (RSD); and LOD, limit of detection. Regression equation was calculated by using peak area as Y (vertical axis), and the concentration as X (horizontal axis). Each compound was measured according to the standard curve by substituting corresponding standard curve equation.