3.6. WAC and OAC of extracted starch<br>The WAC of starches from unfermented and fermented cassava roots<br>varied with fermentation time (Fig. 4). WAC of the starch samples increased with increasing length of fermentation. The ability of starch to<br>absorb water depends on the hydrophilic components in starch. Fermentation of starch results in depolymerisation of starch due to enzymatic and microbial attack into simple sugars as previously stated.<br>Sugars are known to act as humectants and may absorb water. This may<br>explain the increased WAC of starches from the fermented cassava<br>roots.<br>The OAC of the cassava starch decreased after 24 h of fermentation<br>and increased thereafter. An explanation remains to be determined.<br>Previous research indicated that OAC in starch relies mainly on the<br>physical chemistry of oil within the starch structure, since starch does<br>not have non-polar sites similar to those found in proteins (Abu, Duodu,<br>& Minnaar, 2006). Thus, variation in OAC may be due to differences in<br>the extent of breakdown during fermentation.
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