Effects of sodium carbonate on pasting properties of maize starch and potato starch by RVA analysis

The effects of sodium carbonate on the pasting properties of maize starch(MS) and potato starch(PS) were investigated. The pasting parameters of 3%and 6%MS and PS suspensions with different amounts of Na2CO3(0、0.02、0.04、0.06、0.08g) were determined with rapid visco analyzer(RVA). The second peak of 6%MS disappeared when adding 0.02 and 0.04g Na2CO3 and reemerged when the amounts were 0.06 and 0.08g. The effects of Na2CO3 on PS and MS were different. The RVA parameters of PS,except gelatinization temperature and setback viscosity,both for 3% and 6% slurry,decreased markedly when adding 0.02g Na2CO3,but it did not have much greater change when adding more. The presence of Na2CO3 increased peak,breakdown,setback viscosities of 6% MS,and reduced the pasting temperature.