The colour difference in unprocessed and processed soybean hull powders was visually shown in Fig. 1(b). Table 1 displayed the parameters (L⁄, a⁄ and b⁄) of HunterLab colour in control and treatment. The L⁄ reading is an indicator of brightness of the sample, with values closer to 100 being more bright. L⁄ value in SHB-T was 76.05 ± 0.19, whereas the one in SHB-C was 58.55 ± 0.23, indicating a significant difference in L⁄ (p < 0.05).
The L⁄ value in SHB-C reported here is in accordance with previously studied (Slavin, Kenworthy, & Yu, 2009), in which L⁄ values ranged from 58.3 ± 1.3 to 63.7 ± 0.5 in yellow soybean seed coat. b⁄ indicates the yellow to blue, with positive values representing yellow and negative values representing blue. The SHB-C powders have higher positive b⁄ than that of SHB-T. SHB-T exhibited more red than SHB-C, while SHB-C performed slightly more yellow than SHB-T. In general, there was significant difference (p < 0.05) in three parameters between SBH-C and SHB-T.
The colour difference in unprocessed and processed soybean hull powders was visually shown in Fig. 1(b). Table 1 displayed the parameters (L⁄, a⁄ and b⁄) of HunterLab colour in control and treatment. The L⁄ reading is an indicator of brightness of the sample, with values closer to 100 being more bright. L⁄ value in SHB-T was 76.05 ± 0.19, whereas the one in SHB-C was 58.55 ± 0.23, indicating a significant difference in L⁄ (p < 0.05).
The L⁄ value in SHB-C reported here is in accordance with previously studied (Slavin, Kenworthy, & Yu, 2009), in which L⁄ values ranged from 58.3 ± 1.3 to 63.7 ± 0.5 in yellow soybean seed coat. b⁄ indicates the yellow to blue, with positive values representing yellow and negative values representing blue. The SHB-C powders have higher positive b⁄ than that of SHB-T. SHB-T exhibited more red than SHB-C, while SHB-C performed slightly more yellow than SHB-T. In general, there was significant difference (p < 0.05) in three parameters between SBH-C and SHB-T.
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