【摘要】：以玉米淀粉為原料,戊二酸酐為酯化劑,蒸餾水為反應(yīng)溶劑,研究并分析了在制備戊二酸淀粉酯的過程中淀粉乳初始濃度、反應(yīng)時(shí)間、反應(yīng)溫度、體系p H值和戊二酸酐用量對(duì)產(chǎn)物取代度的影響。通過單因素實(shí)驗(yàn)和正交實(shí)驗(yàn),得出制備戊二酸淀粉酯的最佳工藝條件:淀粉乳濃度為40%(質(zhì)量分?jǐn)?shù),下同),反應(yīng)時(shí)間為2 h,反應(yīng)溫度35℃,體系p H為8.5。采用傅里葉變換紅外光譜(FT-IR)、X射線衍射儀(XRD)及掃描電子顯微鏡(SEM)對(duì)原玉米淀粉和不同取代度的產(chǎn)物進(jìn)行了結(jié)構(gòu)表征分析。FT-IR顯示戊二酸淀粉酯在1733 cm-1處和1555 cm-1處出現(xiàn)了新的吸收峰,其中1733 cm-1處為C=O的伸縮振動(dòng)吸收峰,1555 cm-1處為游離的-COO-的反對(duì)稱伸縮振動(dòng)吸收峰,表明了淀粉分子中成功接入了戊二酸基團(tuán);XRD分析顯示改性后的淀粉仍屬于A型結(jié)晶結(jié)構(gòu),表明了反應(yīng)主要發(fā)生在無定形區(qū)。
[Abstract]:Using corn starch as raw material, glutaric anhydride as esterification agent and distilled water as reaction solvent, the initial concentration of starch milk, reaction time and reaction temperature in the preparation of starch glutarate were studied and analyzed. The influence of pH value and the amount of glutaric anhydride on the degree of substitution of the product. The optimum conditions of preparing starch glutarate were obtained by single factor experiment and orthogonal experiment: starch milk concentration was 40% (mass fraction), reaction time was 2 h, reaction temperature was 35 鈩，

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