Table 1 Effect of UVC light treatments on the content of phenolic acids and flavonoids from acerola fruit determined by LC–MS. Values represent concentration (mg phenolics/100 freeze-dried acerola).

From: UVC light modulates vitamin C and phenolic biosynthesis in acerola fruit: role of increased mitochondria activity and ROS production

Peak

Retention time (min)

Identification

Day 0

Day 7

UV−

UV+

UV−

UV+

1c

19.5–20.5

Gallic acid

2.9 a

1.3 d

2.3 b

1.5 c

1d

21.3–22.5

Coumaroyl quinic acid

4.0 c

5.3 b

3.9 c

8.1 a

1e

30.25

Cyanidin 3-rhamnoside

1152 a

416 b

47 d

276 c

2

33.03

Pelargonidin 3-rhamnoside

155 a

60 b

25 c

52 b

3

37.37

Pelargonidin

4 b

7 a

0.37 d

1.6 c

4

41.32

Peonidin-3-xylopyranoside

28 b

156 a

ND

6 c

5

46.19

Cyanidin 3-rutinoside

12 c

67 a

ND

19 b

6

47.04

Kaempferol 3-O-robinobioside-7-O-arabinofuranoside

3 c

1.47 d

5.5 a

3 b

7

53.18

Isorhamnetin 3-O-galactoside

3 a

3 a

ND

2.7 b

8

56.06

Isorhamnetin 3-O-glucoside

17 d

21 c

37 b

43 a

9

57.16

Isorhamnetin

1.2 b

1.1 c

1.3 a

ND

10

60.4

Kaempferol 7-O-neohesperidoside

5 b

3.3 c

3.1 d

7 a

11

65.88

Kaempferol 3-O-arabinofuranoside

10.5 d

13.8 c

17.6 b

18.1 a

12

67.19

Quercetin 3-O-glucoside

2.8 b

2.8 b

0.5 c

4.7 a

13

70.38

Quercitrin-2″-O-gallate

1.1 b

0.8 d

1.9 a

1.0 c

14

73.88

Myricetin-3-O-glucuronide

0.1 b

14.3 a

ND

ND

15

74.36

Myricetin-3-O-glucoside

16.1 b

0.1 c

0.25 c

25.1 a

16

76–77.85

Myricetin rhamnoside

107 c

74 d

196 a

167 b

  1. Values represent the mean of three replicates. Values with different letters within the same compound represent statistical difference (p < 0.05) by the Tukey’s HSD test. Concentration values for each type of compound were determined from chromatogram peak areas and standards (Table S1). Areas of peaks 1e to 5 were quantified at 520 nm (Fraction F4) and areas of peaks 1c, 1d, 6–16 were quantified at 330 nm (Fraction F3).
  2. ND not detected.
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