Effect of water content and sugars on the glass transition of casein and sodium caseinate
Tóm tắt
The glass transitions of casein and sodium caseinate were studied as a function of water content, using differential scanning calorimetry (DSC), dynamic mechanical thermal analysis (DMTA), a mechanical three point bend test, solid state 13C nuclear magnetic resonance (NMR) spectroscopy and X‐ray diffraction. Glucose and lactose at 10% mass ratio of anhydrous casein had no effect on the glass transition of casein as a function of water content, although at 50% mass ratio there was some increase in glass transition temperature (Tg), i.e. an anti‐plasticizing effect, with glucose. In contrast, with 50% fructose in sodium caseinate, there was some plasticizing effect. These results are compared with previous results for amylopectin and glutensugar mixtures.
Từ khóa
Tài liệu tham khảo
Adrian J., 1991, Influence of physical and chemical processes on the structure of proteins (especially milk proteins), Medecine et Nutrition, 27, 119
Ferry J.D., 1970, Viscoelastic properties of polymers
Fox P.F., 1989, Developments in Dairy Chemistry‐ 4, 1
Kinsella J.E., 1989, Developments in Dairy Chemistry‐ 4, 55
Levine H., 1988, Food Structure‐ Its creation and evaluation, 149
Mulvihill D.M., 1989, Developments in Dairy Chemistry‐4, 97
Olabisi O., 1979, Polymer‐polymer miscibility
Sears J.K., 1982, The technology of plasticizers
Slade L., 1988, Food Structure ‐ Its creation and evaluation, 115
Southward C.R., 1989, Developments in Dairy Chemistry‐4, 173
Timasheff S.N., 1989, Protein Structure a Practical Approach, 331