氧化羧甲基马铃薯淀粉的制备

Preparation of oxidized carboxymethyl potato starch

以氧化马铃薯淀粉为原料,乙醇为溶剂,氢氧化钠为催化剂,并以取代度为评价指标,分别考察了次氯酸钠用量、一氯乙酸用量、氢氧化钠用量、反应温度、反应时间对氧化羧甲基马铃薯淀粉取代度的影响。实验结果表明,次氯酸钠量为0.823%,nCH2ClCOOH∶nstarch为1.02∶1、nNaOH∶nstarch为2.19∶1,醚化反应时间为58.65min(实际反应58min),在此条件下制得的氧化羧甲基马铃薯淀粉的取代度最高,达到0.278。

The optimal parameters for preparation of oxidized carboxymethyl potato starch were studied. Oxidized potato starch as material,with substitution degree as a evaluating parameter. The effects of NaCIO concentration, monochloracetic acid concentration,sodium hydroxide concentration,reaction temperature and time on the substitution degree of oxidized carboxymethyl potato starch were investigated respectively by using ethanol as solvent and sodium hydroxide as catalyst. The results showed that NaClO concentration 0.823% ,nCH2CICOOH：nsttch= 1.02：1 ,nNaoHnstarh=2.19：1 and time 58.65min（58min in fact）. Under these conditions,the DS was up to 0.278.