The rheological properties of wheat flour are very important for the production of bakery products,and the milling methods greatly influence the rheological properties.In this paper,we measured the particle size distr...The rheological properties of wheat flour are very important for the production of bakery products,and the milling methods greatly influence the rheological properties.In this paper,we measured the particle size distributions,damaged starch contents,granular morphology,and pasting properties of the wheat flour,also carried out the uniaxial elongation test,the texture profile analysis,and rheological properties of the dough to evaluate effects of two milling methods,i.e.impact mill(IM)and hammer mill(HM),on the rheological properties of wheat flour and dough.The results showed that milling methods had no significant effects on flour pasting temperature(except the flour H3 obtained by HM grinding three times)and springiness of dough.Flour samples milled by IM had a lower damaged starch content,higher trough viscosity,higher final viscosity and higher values of setback compared to samples processed by HM.After repeated milling of IM,the damaged starch content of the endosperm granules could be controlled below 1%(P<0.05).There was a gap between H1 and H2 in the elastic modulus value of the non-fermented dough group,and the difference increased after fermentation,which was more obvious in the values of viscosity modulus.The more the milling times,the greater the elastic and viscosity modulus of dough of flour processed by both IM and HM.展开更多
Farinograph, extensograph and mixograph are the special instruments used to determinedough rheological characteristics. In this study, twenty-seven wheat cultivars ofdifferent gluten strength were used to study the co...Farinograph, extensograph and mixograph are the special instruments used to determinedough rheological characteristics. In this study, twenty-seven wheat cultivars ofdifferent gluten strength were used to study the correlations among each rheologicalparameter determined by above instruments. Multiple linear regression analysis and pathcoefficient analysis were used to study the direct and indirect effects of 11 doughrheological characteristics on bread quality. The results showed significant correlationsamong the principal parameters. There were significantly or extremely significantlypositive correlations among development time (DT), stability time (ST), farinographquality number (FQN) of farinograph, area, maximum resistance (Rmax), viscoelastic ratio(Rmax/E)of extensograph and mixing time (MT), 8-minute-curve-tail (8MCT) of mixograph.These indexes affected bread-making quality either directly or indirectly. Of all theindexes, ST, maximum Rmax, MT and FQN were the most important ones.展开更多
利用响应面分析法对老面冷冻面团馒头生产工艺进行了优化。在单因素试验的基础上,选取老面添加量、加水量和发酵时间进行了3因素3水平的Box–Behnken中心组合研究,分别以馒头比容、硬度和感官总分为响应值,通过响应面分析法确定了老面...利用响应面分析法对老面冷冻面团馒头生产工艺进行了优化。在单因素试验的基础上,选取老面添加量、加水量和发酵时间进行了3因素3水平的Box–Behnken中心组合研究,分别以馒头比容、硬度和感官总分为响应值,通过响应面分析法确定了老面冷冻面团馒头的最佳生产工艺。结果表明,各因素对老面冷冻面团馒头品质的影响顺序为老面添加量>加水量>发酵时间,所得最佳工艺参数为老面添加量51.79 g、加水量40.10 m L和发酵时间62.42 min。展开更多
基金the National Natural Science Foundation of China(No.31571873)the National Key Research and Development Program(2018YFD0401001)。
文摘The rheological properties of wheat flour are very important for the production of bakery products,and the milling methods greatly influence the rheological properties.In this paper,we measured the particle size distributions,damaged starch contents,granular morphology,and pasting properties of the wheat flour,also carried out the uniaxial elongation test,the texture profile analysis,and rheological properties of the dough to evaluate effects of two milling methods,i.e.impact mill(IM)and hammer mill(HM),on the rheological properties of wheat flour and dough.The results showed that milling methods had no significant effects on flour pasting temperature(except the flour H3 obtained by HM grinding three times)and springiness of dough.Flour samples milled by IM had a lower damaged starch content,higher trough viscosity,higher final viscosity and higher values of setback compared to samples processed by HM.After repeated milling of IM,the damaged starch content of the endosperm granules could be controlled below 1%(P<0.05).There was a gap between H1 and H2 in the elastic modulus value of the non-fermented dough group,and the difference increased after fermentation,which was more obvious in the values of viscosity modulus.The more the milling times,the greater the elastic and viscosity modulus of dough of flour processed by both IM and HM.
文摘Farinograph, extensograph and mixograph are the special instruments used to determinedough rheological characteristics. In this study, twenty-seven wheat cultivars ofdifferent gluten strength were used to study the correlations among each rheologicalparameter determined by above instruments. Multiple linear regression analysis and pathcoefficient analysis were used to study the direct and indirect effects of 11 doughrheological characteristics on bread quality. The results showed significant correlationsamong the principal parameters. There were significantly or extremely significantlypositive correlations among development time (DT), stability time (ST), farinographquality number (FQN) of farinograph, area, maximum resistance (Rmax), viscoelastic ratio(Rmax/E)of extensograph and mixing time (MT), 8-minute-curve-tail (8MCT) of mixograph.These indexes affected bread-making quality either directly or indirectly. Of all theindexes, ST, maximum Rmax, MT and FQN were the most important ones.
文摘利用响应面分析法对老面冷冻面团馒头生产工艺进行了优化。在单因素试验的基础上,选取老面添加量、加水量和发酵时间进行了3因素3水平的Box–Behnken中心组合研究,分别以馒头比容、硬度和感官总分为响应值,通过响应面分析法确定了老面冷冻面团馒头的最佳生产工艺。结果表明,各因素对老面冷冻面团馒头品质的影响顺序为老面添加量>加水量>发酵时间,所得最佳工艺参数为老面添加量51.79 g、加水量40.10 m L和发酵时间62.42 min。
