CIE L* value and DL* were reported to present the color quality of WWN in the study. As listed in Table 2, the SGF group showed a brighter appearance than eachWWNgroup at both 0 h and 24 h. As the WWF particle size reduced, the lightness (L*) of WWN increased at 0 h. This is mainly due to the fact that the fine bran in WWFis easily incorporated into the matrix of dough during mixing, which decreases the visible specks on the noodle surface (Chen et al., 2011). There was an increase of DL* after 24 h with the reduction of WWF particle size, and the group 43-mm indicated significantly
higher DL* than the group 125-mm. The results were in accordance with our previous study about the effects of fine grinding of millfeeds on the qualities of WWN (Niu et al., 2014a), which also demonstrated that the DL* value of WWN produced after 24 h increased as the particle size of wheat bran decreased. PPO, mostly residing in the bran fraction, has been considered as the leading cause of darkness in noodle (Asenstorfer et al., 2009). It is primarily located in the cell plasmid of the wheat bran layer. The results may be due to the fact that the grinding process can promote the exposure of PPO active sites by fracturing cell walls in bran and create more opportunity for PPO to access enzyme substrates, and
as a result of it, the darkness inWWNincreased as bran particle size reduced. The results also demonstrated that WWN made of finer WWFs still showed brighter color at 24 h after storage compared to WWN made with coarser WWFs, in consideration of the significantly higher L* value of group 43-mmversus group 125-mmat 24 h. This implied that although causing more discoloration in noodle, finer WWFs produced by superfine grinding demonstrated a more beneficial effect on the color quality of WWN.
CIE L* value and DL* were reported to present the color quality of WWN in the study. As listed in Table 2, the SGF group showed a brighter appearance than eachWWNgroup at both 0 h and 24 h. As the WWF particle size reduced, the lightness (L*) of WWN increased at 0 h. This is mainly due to the fact that the fine bran in WWFis easily incorporated into the matrix of dough during mixing, which decreases the visible specks on the noodle surface (Chen et al., 2011). There was an increase of DL* after 24 h with the reduction of WWF particle size, and the group 43-mm indicated significantly
higher DL* than the group 125-mm. The results were in accordance with our previous study about the effects of fine grinding of millfeeds on the qualities of WWN (Niu et al., 2014a), which also demonstrated that the DL* value of WWN produced after 24 h increased as the particle size of wheat bran decreased. PPO, mostly residing in the bran fraction, has been considered as the leading cause of darkness in noodle (Asenstorfer et al., 2009). It is primarily located in the cell plasmid of the wheat bran layer. The results may be due to the fact that the grinding process can promote the exposure of PPO active sites by fracturing cell walls in bran and create more opportunity for PPO to access enzyme substrates, and
as a result of it, the darkness inWWNincreased as bran particle size reduced. The results also demonstrated that WWN made of finer WWFs still showed brighter color at 24 h after storage compared to WWN made with coarser WWFs, in consideration of the significantly higher L* value of group 43-mmversus group 125-mmat 24 h. This implied that although causing more discoloration in noodle, finer WWFs produced by superfine grinding demonstrated a more beneficial effect on the color quality of WWN.
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