This study focuses on the non-linear rheological property and microstructure of peanut protein isolate(PPI)aggregation suspension.The impact of higher harmonics(I3 and I5)on fundamental stress wave during large amplit...This study focuses on the non-linear rheological property and microstructure of peanut protein isolate(PPI)aggregation suspension.The impact of higher harmonics(I3 and I5)on fundamental stress wave during large amplitude oscillatory shear test was studied.Rheological test show that storage modulus G′and loss modulus G″increased with increasing PPI concentration.The non-linear viscoelastic properties of PPI suspension with different concentration were investigated.Using confocal laser-scanning microscopy method,this research explored the microstructure of PPI suspension as well as the fractal dimensions.The new critical strain indirect method combined with Wu-Morbidelli model to calculate the fractal dimension(2.9225)is very close to the actual fractal dimension(2.9206).Fourier Transform Rheology was adopted to get the new critical strain for fractal dimension calculation,which was proved to be feasible.展开更多
The dynamic rheological properties of peanut protein isolate(PPI)suspension and acid-induced PPI gels were studied.In frequency sweep test,the storage modulus(G′)and the loss modulus(G″)of PPI aggregation suspension...The dynamic rheological properties of peanut protein isolate(PPI)suspension and acid-induced PPI gels were studied.In frequency sweep test,the storage modulus(G′)and the loss modulus(G″)of PPI aggregation suspensions at different concentrations increased with the increase of frequency.The steady state shear flow test showed that PPI aggregation suspension had a thinning behavior of the shear,and the image of steady shear curve fitted the Carreau model.After gel formation,acid-induced PPI gels showed a typical Type I behavior(strain thinning)in strain sweep test,meaning that PPI gel got easily broken down,and there was a very small opportunity for the protein molecules to re-establish the network.Compared with the strain sweep of PPI aggregation suspensions and gels,the range of the storage modulus existed a dramatic difference,which could get about tenfold.As the frequency increased,both elasticity and viscosity increased in frequency sweep test,which indicated that the frequency dependence of the storage modulus increased with the increase of concentration.展开更多
基金This research project was supported by General Project of Scientific Research Program of Beijing Education Commission(KM201910011003,KM201910011001)Joint Program of Beijing Natural Science Foundation Committee and Beijing Education Committee(KZ201810011017)and Beijing Excellent Talent Training Project(2017000020124G100).
文摘This study focuses on the non-linear rheological property and microstructure of peanut protein isolate(PPI)aggregation suspension.The impact of higher harmonics(I3 and I5)on fundamental stress wave during large amplitude oscillatory shear test was studied.Rheological test show that storage modulus G′and loss modulus G″increased with increasing PPI concentration.The non-linear viscoelastic properties of PPI suspension with different concentration were investigated.Using confocal laser-scanning microscopy method,this research explored the microstructure of PPI suspension as well as the fractal dimensions.The new critical strain indirect method combined with Wu-Morbidelli model to calculate the fractal dimension(2.9225)is very close to the actual fractal dimension(2.9206).Fourier Transform Rheology was adopted to get the new critical strain for fractal dimension calculation,which was proved to be feasible.
基金This research project was supported bythe 2021 Postgraduate Research Ability Improvement Program BTBU,General Project of Scientific Research Program of Beijing Education Commission(Grant No.KM201910011003,KM201910011001)Joint Program of Beijing Natural Science Foundation Committee and Beijing Education Committee(Grant No.KZ201810011017)This research project was also supported by Beijing Excellent Talent Training Project(Grant No.2017000020124G100).
文摘The dynamic rheological properties of peanut protein isolate(PPI)suspension and acid-induced PPI gels were studied.In frequency sweep test,the storage modulus(G′)and the loss modulus(G″)of PPI aggregation suspensions at different concentrations increased with the increase of frequency.The steady state shear flow test showed that PPI aggregation suspension had a thinning behavior of the shear,and the image of steady shear curve fitted the Carreau model.After gel formation,acid-induced PPI gels showed a typical Type I behavior(strain thinning)in strain sweep test,meaning that PPI gel got easily broken down,and there was a very small opportunity for the protein molecules to re-establish the network.Compared with the strain sweep of PPI aggregation suspensions and gels,the range of the storage modulus existed a dramatic difference,which could get about tenfold.As the frequency increased,both elasticity and viscosity increased in frequency sweep test,which indicated that the frequency dependence of the storage modulus increased with the increase of concentration.
