3.3. Effect of sorghum addition on starch fractions of pasta
The amylose content of the starches of the three flours (mean ± SD, n = 3); DWS (23.0 ± 0.83%), RSF (22.4 ± 1.46%) and WSF (19.3 ± 2.70%) was not significantly different (p > 0.05). The amylose content plays an important role in resistant starch formation. In general cereals with higher amylose content can have lower starch digestibility and higher levels of resistant starch ( Sajilata et al., 2006). However in sorghum grain other factors including starch–protein interaction and enzyme inhibitory effect of sorghum polyphenols ( Taylor & Emmambux, 2010) may also affect resistant starch content beyond effects due to amylose levels.
The starch fractions (total, digestible and resistant) of the flours (DWS, RSF and WSF) and pastas containing different percentages of RSF and WSF are shown in Table 3. WSF had a significantly higher (p < 0.05) total starch and digestible starch content than RSF and DWS. However the resistant starch content of the RSF was significantly higher (p < 0.05) than that of the WSF which in turn was higher (p < 0.05) than that of the DWS. The higher resistant starch content of the sorghum flours compared to the DWS might be a result of the digestive enzyme inhibitory effect of sorghum polyphenols and sorghum starch–protein interactions ( Austin et al., 2012 and Taylor and Emmambux, 2010).
3.3. Effect of sorghum addition on starch fractions of pastaThe amylose content of the starches of the three flours (mean ± SD, n = 3); DWS (23.0 ± 0.83%), RSF (22.4 ± 1.46%) and WSF (19.3 ± 2.70%) was not significantly different (p > 0.05). The amylose content plays an important role in resistant starch formation. In general cereals with higher amylose content can have lower starch digestibility and higher levels of resistant starch ( Sajilata et al., 2006). However in sorghum grain other factors including starch–protein interaction and enzyme inhibitory effect of sorghum polyphenols ( Taylor & Emmambux, 2010) may also affect resistant starch content beyond effects due to amylose levels.The starch fractions (total, digestible and resistant) of the flours (DWS, RSF and WSF) and pastas containing different percentages of RSF and WSF are shown in Table 3. WSF had a significantly higher (p < 0.05) total starch and digestible starch content than RSF and DWS. However the resistant starch content of the RSF was significantly higher (p < 0.05) than that of the WSF which in turn was higher (p < 0.05) than that of the DWS. The higher resistant starch content of the sorghum flours compared to the DWS might be a result of the digestive enzyme inhibitory effect of sorghum polyphenols and sorghum starch–protein interactions ( Austin et al., 2012 and Taylor and Emmambux, 2010).
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