The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has be...The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has been successfully applied to the selective ethoxylation reaction of a mixture of alcohols. The experimental results showed that the calcined hydrotalcite is an efficient solid base catalyst for synthesis of BuO(EO) 3H with high selectivity of over 90%.展开更多
研究湿热条件下反应温度、反应时间及混合质量比对大豆分离蛋白(soybean protein isolate,SPI)与葡萄糖、麦芽糖之间美拉德反应的影响,并对所得美拉德反应产物的溶解性、乳化性、溶液pH值、电势、热性能、结构和分子质量的变化进行表征...研究湿热条件下反应温度、反应时间及混合质量比对大豆分离蛋白(soybean protein isolate,SPI)与葡萄糖、麦芽糖之间美拉德反应的影响,并对所得美拉德反应产物的溶解性、乳化性、溶液pH值、电势、热性能、结构和分子质量的变化进行表征。结果表明,SPI与2种还原糖发生美拉德反应的最适条件为按质量比4∶1混合后在80℃条件下反应6 h。美拉德反应明显改善了SPI的溶解度,并且麦芽糖比葡萄糖对SPI的改性效果更佳;美拉德反应降低了SPI的乳化性,并对其ζ电势有一定影响,随着美拉德反应程度的增加,SPI的负电荷明显减少;美拉德反应会使SPI溶液的pH值降低;热稳定性分析表明美拉德反应降低了SPI的热稳定性;傅里叶变换红外光谱分析表明美拉德反应在SPI中引入了新的化学键;荧光分析表明美拉德反应增强了SPI的荧光强度;十二烷基硫酸钠-聚丙烯酰胺凝胶电泳测定表明美拉德反应导致了大分子物质的形成。展开更多
文摘The hydrotalcite (n(Mg)/n(Al)=3) calcined at 500 ℃, containing a great number of fine pores (d<3 5 nm, 34% of the all pore volume) and increased BET surface area by about three times (from 75 to 205 m 2/g), has been successfully applied to the selective ethoxylation reaction of a mixture of alcohols. The experimental results showed that the calcined hydrotalcite is an efficient solid base catalyst for synthesis of BuO(EO) 3H with high selectivity of over 90%.
文摘研究湿热条件下反应温度、反应时间及混合质量比对大豆分离蛋白(soybean protein isolate,SPI)与葡萄糖、麦芽糖之间美拉德反应的影响,并对所得美拉德反应产物的溶解性、乳化性、溶液pH值、电势、热性能、结构和分子质量的变化进行表征。结果表明,SPI与2种还原糖发生美拉德反应的最适条件为按质量比4∶1混合后在80℃条件下反应6 h。美拉德反应明显改善了SPI的溶解度,并且麦芽糖比葡萄糖对SPI的改性效果更佳;美拉德反应降低了SPI的乳化性,并对其ζ电势有一定影响,随着美拉德反应程度的增加,SPI的负电荷明显减少;美拉德反应会使SPI溶液的pH值降低;热稳定性分析表明美拉德反应降低了SPI的热稳定性;傅里叶变换红外光谱分析表明美拉德反应在SPI中引入了新的化学键;荧光分析表明美拉德反应增强了SPI的荧光强度;十二烷基硫酸钠-聚丙烯酰胺凝胶电泳测定表明美拉德反应导致了大分子物质的形成。
