. 2021 Jan 7;10(1):115. doi: 10.3390/foods10010115

Table 2.

HPLC-DAD-ESI/MS analysis of free (FP) and bound (BP) phenolic fractions of wheat grain (WG), oat grain (OG), wheat bran (WB) and oat bran (OB). Results were expressed in (μg g⁻¹ d.m.).

	WG	WB	OG	OB
SOLUBLE FRACTION
Ferulic acid	25.40 ± 1.10 ^a	51.93 ± 2.69 ^b	N.D.	N.D.
Caffeic Acid-4-Glucoside	17.69 ± 3.80 ^a	67.33 ± 1.71 ^d	22.39 ± 0.11 ^b	30.45 ± 1.19 ^c
Isovitexin 8-C-β-glucoside (Vicenin-2)	0.00 ± 0.00 ^a	36.92 ± 0.68 ^d	6.99 ± 0.23 ^b	7.81 ± 0.10 ^c
Apigenin-6/8-C-pentoside-8/6-C-hexoside I	19.96 ± 7.00 ^a	15.56 ± 0.85 ^a	11.54 ± 8.36 ^a	15.55 ± 6.53 ^a
Apigenin-6/8-C-pentoside-8/6-C-hexoside II	12.66 ± 6.06 ^c	7.24 ± 0.00 ^b	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a
Apigenin-6/8-C-pentoside-8/6-C-hexoside III	12.09 ± 1.09 ^c	0.00 ± 0.00 ^a	5.29 ± 0.74 ^b	4.26 ± 1.51 ^b
Apigenin-8-C-glucoside (Vitexin)	115.97 ± 0.06 ^c	551.05 ± 28.50 ^d	24.74 ± 1.90 ^a	49.63 ± 1.59 ^b
1-Acetoxy pinoresinol	0.00 ± 0.00 ^a	40.42 ± 1.88 ^b	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a
Daidzein	0.00 ± 0.00 ^a	27.39 ± 1.54 ^a	29.17 ± 0.11 ^a	28.72 ± 1.33 ^a
Apigenin-6-C-arabinoside-8-C-hexoside I	24.95 ± 2.62 ^b	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a
Apigenin-6-C-arabinoside-8-C-hexoside II	39.52 ± 0.82 ^b	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a
Avenanthramide K	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	6.15 ± 0.19 ^b	8.16 ± 0.59 ^c
Glycosilated/Acetylated-3′,4′,5′-trihydroxy-3,7-dimethylflavone	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	11.47 ± 0.62 ^b	8.16 ± 0.26 ^a
Apigenin-6-C-galactosyl-8-C-glucosyl-O-glucuropyranoside	15.63 ± 0.65 ^b	56.11 ± 5.29 ^c	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a
Avenanthramide 2c	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	17.28 ± 0.24 ^c	13.67 ± 0.01 ^b
Avenanthramide 2p	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	32.28 ± 0.32 ^c	17.23 ± 0.86 ^b
Avenanthramide 2f	0.00 ± 0.00 ^a	0.00 ± 0.00 ^a	27.29 ± 0.00 ^b	24.59 ± 1.60 ^a
Total	283.88 ± 0.50 ^c	853.94 ± 39.08 ^d	194.60 ± 10.53 ^a	208.23 ± 15.56 ^b
INSOLUBLE FRACTION
Medioresinol	233.48 ± 0.69 ^c	891.66 ± 54.60 ^d	126.23 ± 4.22 ^b	76.22 ± 7.18 ^a
Ferulic acid	3776.53 ± 4.74 ^b	16,936.18 ± 1055.39 ^c	1165.71 ± 5.63 ^a	1769.94 ± 181.73 ^b
Dihydroferulic Acid I	47.35 ± 0.36 ^c	0.00 ± 0.00 ^a	24.64 ± 5.44 ^a	36.86 ± 1.98 ^b
Dihydroferulic Acid II	188.41 ± 1.48 ^b	333.62 ± 36.69 ^c	86.65 ± 42.89 ^a	88.08 ± 3.63 ^a
Dihydroferulic Acid III	444.07 ± 0.07 ^c	1215.03 ± 162.10 ^d	190.58 ± 5.15 ^b	182.94 ± 6.36 ^a
Total	4689.84 ± 19.33 ^c	19,376.57 ± 911.20 ^d	1593.81 ± 52.07 ^a	2154.04 ± 200.88 ^b

Values with different lowercase letters in the same row indicate significant differences among samples (p < 0.05).