Table 2.

Feasibility of coating with a suspension of TiO₂ in soy stearin solution

Coating Material	L*	a*	b*	WI
10% w/w HPMC (without TiO2)	37.4 ± 0.9a	11.5 ± 0.1f	16.0 ± 0.4f	35.6 ± 0.7a
10% w/w Soy stearin (without TiO2)	56.7 ± 4.8b	5.0 ± 1.4e	7.9 ± 1.0e	50.5 ± 5.1b
5% w/w TiO2 + 10% w/w SS Blend	64.4 ± 0.3c	0.3 ± 0.2d	− 4.2 ± 0.2a	64.2 ± 0.2c
10% w/w TiO2 + 10% w/w SS Blend	76.8 ± 0.2e	− 1.2 ± 0.2b	− 3.7 ± 0.5a	76.4 ± 0.1e
15% w/w TiO2 + 10% w/w SS Blend	86.4 ± 0.3f	− 1.5 ± 0.1a,b	-0.7 ± 1.0c	87.0 ± 0.2f
20% w/w TiO2 + 10% w/w SS Blend	91.9 ± 1.4 g	− 1.7 ± 0.4a	− 1.8 ± 1.1a,b	92.1 ± 0.9 g
10% w/w TiO2 + 10% w/w HPMC Blend	60.3 ± 1.0b	1.7 ± 0.2e	0.8 ± 0.2d	60.2 ± 0.9b
15% w/w TiO2 + 10% w/w HPMC Blend	74.0 ± 1.3d	− 0.5 ± 0.3c	− 2.5 ± 0.1b	73.4 ± 0.7d
Color masked(15%w/w TiO2); Coated(10%w/w SS)	88.8 ± 3.5f,g	− 0.6 ± 0.3c	0.2 ± 1.3c,d	88.7 ± 2.4f

Premix samples were coated with varying proportion of TiO₂ and soy stearin in suspension. The whiteness index of the premix increased as the amount of TiO₂ in the suspension increased. L^* (+ = lighter; −  = blacker); a^* (+ = red; − = green); b^* (+ = yellow;  −   = blue); HPMC: hydroxypropyl methylcellulose; SS: soy stearin; the values were averages of 5 replicates ± standard deviation; the differences between means were considered significant at P < 0.05