Polydispersity, gelatin

Figure 7.12 Sequence of CLSM images recorded during melting of a 24-hour-old fractal particle gel formed by quenching a 1 wt% gelatin + 7 wt% oxidized starch system from 40 to 24 °C (a) immediately before heating (b) network rearrangement and coarsening (c) network break-up (d) aggregate melting into polydisperse liquid droplets. Reproduced from Firoozmand el al. (2007) with permission.

Clewlow, A.C., Rowe, A.J., and Tombs, M.P. (1995). Pectin-gelatin phase separation the influence of polydispersity. In S.E. Harding, S.E. Hill, and J.R. Mitchell (Eds.), Biopolymer Mixtures, Nottingham University Press, Nottingham, UK, pp. 173-191. 

Therefore, in addition to the concentration of starch that influences the magnitude of (Colas, 1986 Evans and Haisman, 1979), increase in polydispersity of the gelatinized granules appears to be an important factor in decreasing the severity of shear thickening and increasing pseudoplasticity of gelatinized starch dispersions. 

Consider a mixture containing number fraction nx= jl of the protein gelatin with molar mass A/a = lO gi ior and number fraction b= 1-Ha =1/2 of gelatin dimers with molar mass Mb = 2x lO gmoU. What are the number- and weight-average molar masses of this sample and its polydispersity index ... 

Photon Correlation Spectroscopy Studies. In order to investigate possible aggregate formation between the gelatins at 40°C photon correlation spectroscopy was used. The following pairs of Type A and Type B gelatin solutions (0.5% w/v) were prepared and studied by PCS both individually and as mixtures and the values obtained for the average particle diameter and the polydispersity were compared ... 

Particle Diameter and Polydispersity of 0.5% w/v Solutions of Type A and Type B Gelatin, Before and After Mixing at 40°C (Equal Concentrations)... 

In Ref. [42], PEO was embedded in a w/o-droplet microemulsion and studied by small-angle neutron scattering. The authors state that this polymer does not adsorb considerably at the SDS monolayer. The important statement is that both the size polydispersity and the shape fluctuations are increased compared to the reference system without polymer. Larger shape fluctuations are also found for gelatine embedded in w/o-droplet microemulsions (see Fig. 4.10 in [43]). Here, by strong confinement, the elongated shapes... 

Abbreviations PCS photon correlation spectroscopy, PDI polydispersity index, SlOO purified soybean lecithin Lipoid SlOO, E80 purified egg yolk lecithin Lipoid E80, SGC sodium glycocholate, SML sucrose monolaurate, GS gelatin succinate, SC sodium caseinate, PVA polyvinyl alcohol Mowiol 3-83, POL poloxamer 188 and TET poloxamine 708. 

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