Table 3: Flavanones glycosides, flavanones, and polymethoxylated flavones content (milligrams per gram of dry weight) and relative standard deviations (RSD) both for white and pink grapefruit peel extracts.

 Fresh white
grapefruit
 White grapefruit
oven-dried at 45°C
 White grapefruit
oven-dried at 60°C
 Freeze-dried
white grapefruit
 Fresh pink
grapefruit
 Pink grapefruit
oven-dried at 45°C
 Pink grapefruit
oven-dried at 60°C
 Freeze-dried
pink grapefruit

Isonaringin13.42a(13.92)4.57b(1.71)4.02b(0.22)7.17c(2.06)11.85a(10.73)3.72b(5.65)3.55b(0.32)5.22b(4.74)
Naringin160.25a(18.24)59.41b(1.96)51.16b(0.25)95.08c(5.39)142.39a(16.81)45.92b(6.39)43.50b(0.34)50.40b(3.12)
Hesperidin3.23a(15.81)0.51cd(2.20)0.37cd(5.82)0.65cd(1.90)2.68b(6.31)0.21d(6.29)0.13d(0.26)0.95c(2.77)
Neohesperidin3.30a(9.93)0.79c(2.34)0.67cd(0.48)1.39(5.45)2.93b(7.40)0.30d(6.41)0.27d(0.39)0.79c(2.09)
Unknown-14.39a(5.26)0.76c(2.17)0.76c(0.08)0.74c(1.26)3.88b(4.83)0.93c(10.65)0.84c(0.12)0.61c(5.59)
Unknown-25.36a(6.71)1.67bc(2.28)1.46b(1.80)2.20c(7.01)5.05a(8.82)1.60bc(4.70)1.29b(0.08)1.09b(1.40)
Naringenin8.49a(9.95)5.05b(2.16)4.54b(1.10)7.83a(4.78)8.14a(15.83)2.87c(5.29)2.49c(0.29)2.35c(0.35)
Hesperetin2.93a(2.24)0.54c(1.94)0.43cd(1.17)0.87(1.25)2.55b(3.03)0.42cd(5.57)0.39d(1.40)0.47cd(6.99)
Isosinensetin3.02a(3.71)0.56b(3.44)0.45b(0.59)0.60a(4.96)3.12a(10.67)0.41b(1.34)0.43b(2.07)0.24b(6.16)
Sinensetin2.10a(14.48)1.82a(0.13)1.78a(0.68)1.74a(2.68)2.07a(5.30)0.63b(0.77)0.63b(0.69)0.79b(7.69)
Unknown-34.07a(9.42)1.14b(4.56)0.99b(0.87)1.46b(3.69)3.86a(9.83)0.32c(5.50)0.32c(3.68)0.41c(8.13)
Nobiletin2.36a(14.26)1.22c(1.29)1.35c(13.02)2.09a(12.63)3.45b(11.67)0.63d(2.74)0.58d(2.61)1.24c(10.19)
Tangeretin2.45a(10.48)2.05c(1.11)1.98c(5.29)1.96c(2.51)1.03b(3.34)0.97b(0.38)0.97b(0.46)1.06b(8.32)

Compounds tentatively identified. Data are expressed as naringin equivalents (mg/g).
Different letters in the same column denote a significant difference according to the Student-Newman-Keuls test, at .