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Table 4 Identification and quantification of individual phenols in ethyl acetate extract

From: Screening for antioxidant and antibacterial activities of phenolics from Golden Delicious apple pomace

Peaks RT Individual phenols Standard equations/[Y = ax + b] R2 Contents (mg/g powder)
1 3.95 Gallic acid Y = 0. 208 x + 0.009 0.9987 0.06f ± 0.01
7 24.64 Chlorogenic acid Y = 0.108 x + 0.006 0.9981 0.06f ± 0.01
8 25.97 Procyanidin B2 Y = 0.541 x + 0.097 0.9993 0.14c ± 0.02
11 28.82 Phloridzin Y = 0.935 x + 0.470 0.9992 0.86a ± 0.25
12 29.64 Syringin Y = 0.293 x + 0.017 0.9943 0.07ef ± 0.02
13 30.26 Hyperin Y = 0.489 x + 0.038 0.9983 0.11d ± 0.08
14 30.66 Quercetin-3-O- pentoside Y = 0.453 x + 0.036 0.9961 0.11d ± 0.07
15 31.13 Quercetin-3-rhamnoside Y = 0.503 x + 0.056 0.9957 0.11d ± 0.07
18 32.90 Phloretin Y = 0.830 x + 0.215 0.9995 0.78b ± 0.23
20 35.37 Quercetin Y = 0.301x + 0.028 0.9975 0.08e ± 0.01
  1. Values are expressed as the mean ± standard deviation (n = 3)
  2. Y is the relative absorption area of corresponding reference standard at 280 nm. x is the content of corresponding reference standard
  3. RT retention time (min), R 2 determination coefficient
  4. a–fColumn wise values with different superscripts of this type denote significant differences (P < 0.05)