Starch model comparisons

Comparison with the Crystalline Structure of A- and B-Type Starch. In the most recent crystallographic studies on the crystalline part of starch (14.15) the structure of both polymorphs are based on a parallel arrangement of left-handed double-helices. In the two observed structures the double-helices are slightly different since small variations away from the perfect six-fold symmetry are found. Nevertheless, they correspond closely to the model studied here. The essential result is that in these two structures the closest interactions between two neighboring double-helices correspond closely to the duplex described as PARA 1. 

Immobilized cellulase and amylase are able to hydrolyze cellulose and starch. However, the immobilized enzymes possess only about 1-6% of the activity of the soluble forms. In addition, immobilization clearly enhanced the thermal stability of amylase. Immobilized amylase retained more than half of its activity, even after incubation at 125°C. By comparison, soluble amylase was almost completely inactivated under these conditions. Furthermore, kinetics modeling indicates that the susceptibility to product inhibition is dependent on the amylase source. Finally, immobilization can reduce the susceptibility to product inhibition fQ was less for each of the immobilized forms, compared with their soluble counterparts. 

Figure 5. Comparison of product release based on the mathematical model (dashed lines) and experimental data (symbols), a starch granules + Parafilm blends, and b starch flakes + Parafilm blends. Numbers associated with lines indicate starch content (v/v) in blends.

Figure 8 shows the comparison of theoretical predictions of equation (9) with experimental values for Young s modulns in starch/PVOH/Na-MMT and starch/PVOH/ LRD nanocomposites. Similar to WVP models, some obvious expectations can be quantified higher aspect ratio filler provide substantial improvement of Young s modulus for given filler volume fraction. In Figure 8, it is observed that modulus of starch/ PVOH/Na-MMT does not follow well with model predictions with aspect ratio a = 100. The reason for this is because most mechanical model predictions are based on complete layer exfoliation and perfect orientation. However, a state of delamination... 

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