Varied Composition of Tocochromanols in Different Types of Bran: Rye, Wheat, Oat, Spelt, Buckwheat, Corn, and Rice

Figures & data

FIGURE 1 Chromatograms of tocopherols (Ts) and tocotrienols (T3s) in different types of bran.

TABLE 1 Content of tocopherol and tocotrienol homologues in various types of bran determined by RP-HPLC/FLD

		Tocochromanols content (mg/100 g dw)
Type of bran	n*	α-T	β-T	β-T	δ-T	α-T3	β-T3	β-T3	δ-T3	Total T+T3
Rye	6
mean		1.4 ± 0.8^a	0.7 ± 0.3^c	0.1 ± 0.1^a	0.1 ± 0.1^a	4.7 ± 1.6^b	3.7 ± 1.0^b	nd	nd	10.7 ± 3.9^a,b
range		0.7 – 2.9	0.4 – 1.3	0.0 – 0.2	0.0 – 0.1	2.8 – 6.6	2.6 – 4.7	—	—	7.3 – 13.2
Wheat	6
mean		1.9 ± 0.9^a	1.1 ± 0.4^d	0.1 ± 0.1^a	0.1 ± 0.1^a	2.2 ± 0.5^a	7.4 ± 2.1^c	nd	nd	12.8 ± 3.9^b
range		0.6 – 3.1	0.5 – 1.6	0.0 – 0.1	0.0 – 0.1	1.5 – 2.8	5.0 – 10.3	—	—	10.7 – 16.7
Oat	7
mean		1.4 ± 0.4^a	0.3 ± 0.1^a	0.1 ± 0.1^a	0.1 ± 0.1^a	3.0 ± 0.9^a	0.6 ± 0.2^a	nd	nd	5.5 ± 1.8^a
range		1.1 – 2.1	0.1 – 0.5	0.0 – 0.2	0.0 – 0.2	1.7 – 4.1	0.4 – 1.0	—	—	4.3 – 6.7
Spelt	7
mean		1.4 ± 0.5^a	0.6 ± 0.3^b,c	0.1 ± 0.1^a	tr	2.8 ± 0.3^a	10.9 ± 3.0^d	nd	nd	15.8 ± 4.1^b
range		0.8 – 1.9	0.2 – 0.9	0.0 – 0.1	—	2.5 – 3.1	7.2 – 13.8	—	—	11.9 – 19.7
Buckwheat	4
mean		0.8 ± 0.3^a	tr	13.3 ± 7.5^b	0.6 ± 0.2^c	tr	nd	nd	nd	14.7 ± 8.0^b
range		0.4 – 1.3	—	5.8 – 24.4	0.3 – 1.0	—	—	—	—	6.9 – 27.3
Corn	2
mean		2.1 ± 0.2^a	0.1 ± 0.1^a	10.1 ± 0.5^b	0.4 ± 0.1^b	1.5 ± 0.1^a	nd	1.9 ± 0.1^a	0.1 ± 0.1^a	16.2 ± 1.0^b
range		1.9 – 2.3	0.1 – 0.2	9.5 – 10.6	0.3 – 0.4	1.4 – 1.6	—	1.7 – 2.0	0.0 – 0.1	15.1 – 17.2
Rice	5
mean		1.8 ± 1.9^a	0.3 ± 0.3^a,b	0.8 ± 0.7^a	0.2 ± 0.1^a	1.9 ± 2.8^a	0.3 ± 0.2^a	2.8 ± 3.7^a	1.0 ± 1.4^b	9.1 ± 9.5^a,b
range		0.7 – 5.5	0.1 – 0.8	0.4 – 2.3	0.1 – 0.3	0.2 – 7.4	0.1 – 0.6	0.8 – 10.1	0.1 – 3.9	2.7 – 27.7

Different letters in the same column indicate statistically significantly at p < 0.05.

T: tocopherol; T3: tocotrienol; nd: not detected; tr: trace (below 0.05 mg/100 g dw); ±: standard deviations of n × 3 (replication of independent samples).

*The number of samples from different manufacturers.