To investigate the enthalpy relaxation behavior of maltitol glass system,differential scanning calorimetry（DSC） was used to obtain the specific heat capacity[C p（T）] near the glass transition temperature（T g） at...To investigate the enthalpy relaxation behavior of maltitol glass system,differential scanning calorimetry（DSC） was used to obtain the specific heat capacity[C p（T）] near the glass transition temperature（T g） at different cooling rates ranged between 1 and 20 K/min.Three phenomenological models of enthalpy relaxation,ToolNarayanaswamy-Moynihan（TNM） model,Adam-Gibbs-Vogel（AGV） model and Gómez Ribelles（GR） model,were used to simulate the experimental data.The models＇ parameters were obtained via a curve-fitting method.The results indicate that TNM and AGV models gave the almost identical prediction powers and can reproduce the curves of experimental C p（T） very well.However,the prediction power of GR model evolved from configurational entropy approach is not so good as those of TNM and AGV models.In particular,the metastable limit state parameter（δ） introduced by Gómez Ribelles has insignificant effect on the enthalpy relaxation of the small molecular hydrogen-bonding glass system.展开更多
Prebiotic-like effects of maltitol were investigated supplementing two groups of rats with either 5% maltodextrin (control group) or 5% maltitol (maltitol group). A third group was supplemented with 5% maltitol at fir...Prebiotic-like effects of maltitol were investigated supplementing two groups of rats with either 5% maltodextrin (control group) or 5% maltitol (maltitol group). A third group was supplemented with 5% maltitol at first and then with 5% maltodextrin (maltitol/maltodextrin group). Faecal parameters were monitored throughout the experiment and caecal parameters at the end. The weights of caecal content and caecal wall were significantly higher in the maltitol group than in the control group, but not in the maltitol/maltodextrin group. Propionic acid concentration was significantly higher in the maltitol group compared to both control and maltitol/maltodextrin group. Faecal parameters were also influenced by the dietary supplementation with maltitol: the amount of dry matter in feces decreased and alpha-glucosidase activity increased. These effects lasted 28 days in the maltitol only group, whereas they stopped some days after the switch to maltodextrin in the maltitol/maltodextrin group. Maltitol could induce prebiotic-like effects.展开更多
为探究麦芽糖醇代替蔗糖在冷冻馒头面团中应用的可行性,采用0%(S100-M0)、25%(S75-M25)、50%(S50-M50)、75%(S25-M75)、100%(S0-M100)(质量分数)的麦芽糖醇替代蔗糖制作冷冻面团,对面团水分迁移、流变学、熔融特性以及馒头色泽、质构、...为探究麦芽糖醇代替蔗糖在冷冻馒头面团中应用的可行性,采用0%(S100-M0)、25%(S75-M25)、50%(S50-M50)、75%(S25-M75)、100%(S0-M100)(质量分数)的麦芽糖醇替代蔗糖制作冷冻面团,对面团水分迁移、流变学、熔融特性以及馒头色泽、质构、挥发性风味物质的变化进行分析。结果表明,添加麦芽糖醇后,冷冻面团解冻损失率显著降低;水分流动性显示,S50-M50、S25-M75处理组的冷冻面团结合水含量较高,水分流动性较低;熔融特性表明,S25-M75具有最低的热焓值ΔH和可冻结水含量(F_(w));频率扫描显示,S75-M25、S50-M50、S25-M75处理组提高了面团的黏弹性。冷冻面团蒸制后,糖醇处理的馒头自由水含量下降;S50-M50、S25-M75处理组呈现较稳定的色泽品质;S75-M25、S0-M100处理组的硬度、咀嚼性显著增加;GC-MS结果显示,5种处理组共测出14个香气成分,利用投影变量重要性因子(variable importance in projection,VIP)从所有处理组中筛选出27个差异香气物质对馒头进行区分,并将5个处理组的馒头聚为三类,其中S75-M25、S50-M50、S25-M75这3组归为一类,具有较高度的相似性。综上,S75-M25、S50-M50对冷冻面团特性及馒头品质具有较优的保护效果,该结果可为麦芽糖醇在冷冻面制品中的应用提供理论参考。展开更多
基金Supported by the National Natural Science Foundation of China(No.20803016)the Natural Science Foundation of Anhui Province,China(No.070414163)
文摘To investigate the enthalpy relaxation behavior of maltitol glass system,differential scanning calorimetry（DSC） was used to obtain the specific heat capacity[C p（T）] near the glass transition temperature（T g） at different cooling rates ranged between 1 and 20 K/min.Three phenomenological models of enthalpy relaxation,ToolNarayanaswamy-Moynihan（TNM） model,Adam-Gibbs-Vogel（AGV） model and Gómez Ribelles（GR） model,were used to simulate the experimental data.The models＇ parameters were obtained via a curve-fitting method.The results indicate that TNM and AGV models gave the almost identical prediction powers and can reproduce the curves of experimental C p（T） very well.However,the prediction power of GR model evolved from configurational entropy approach is not so good as those of TNM and AGV models.In particular,the metastable limit state parameter（δ） introduced by Gómez Ribelles has insignificant effect on the enthalpy relaxation of the small molecular hydrogen-bonding glass system.
文摘Prebiotic-like effects of maltitol were investigated supplementing two groups of rats with either 5% maltodextrin (control group) or 5% maltitol (maltitol group). A third group was supplemented with 5% maltitol at first and then with 5% maltodextrin (maltitol/maltodextrin group). Faecal parameters were monitored throughout the experiment and caecal parameters at the end. The weights of caecal content and caecal wall were significantly higher in the maltitol group than in the control group, but not in the maltitol/maltodextrin group. Propionic acid concentration was significantly higher in the maltitol group compared to both control and maltitol/maltodextrin group. Faecal parameters were also influenced by the dietary supplementation with maltitol: the amount of dry matter in feces decreased and alpha-glucosidase activity increased. These effects lasted 28 days in the maltitol only group, whereas they stopped some days after the switch to maltodextrin in the maltitol/maltodextrin group. Maltitol could induce prebiotic-like effects.
文摘为探究麦芽糖醇代替蔗糖在冷冻馒头面团中应用的可行性,采用0%(S100-M0)、25%(S75-M25)、50%(S50-M50)、75%(S25-M75)、100%(S0-M100)(质量分数)的麦芽糖醇替代蔗糖制作冷冻面团,对面团水分迁移、流变学、熔融特性以及馒头色泽、质构、挥发性风味物质的变化进行分析。结果表明,添加麦芽糖醇后,冷冻面团解冻损失率显著降低;水分流动性显示,S50-M50、S25-M75处理组的冷冻面团结合水含量较高,水分流动性较低;熔融特性表明,S25-M75具有最低的热焓值ΔH和可冻结水含量(F_(w));频率扫描显示,S75-M25、S50-M50、S25-M75处理组提高了面团的黏弹性。冷冻面团蒸制后,糖醇处理的馒头自由水含量下降;S50-M50、S25-M75处理组呈现较稳定的色泽品质;S75-M25、S0-M100处理组的硬度、咀嚼性显著增加;GC-MS结果显示,5种处理组共测出14个香气成分,利用投影变量重要性因子(variable importance in projection,VIP)从所有处理组中筛选出27个差异香气物质对馒头进行区分,并将5个处理组的馒头聚为三类,其中S75-M25、S50-M50、S25-M75这3组归为一类,具有较高度的相似性。综上,S75-M25、S50-M50对冷冻面团特性及馒头品质具有较优的保护效果,该结果可为麦芽糖醇在冷冻面制品中的应用提供理论参考。
