title: [Rheology and spinning of alkaline solutions of sunflower seed globulin and casein].
abstract: The specific demand of sodium hydroxide is determined for the dissolution of sunflower seed globulin, casein and a mixture of them to equal parts. In low protein-containing solutions it depends for sunflower seed globulin very much on the sodium chloride concentration. From sunflower seed globulin, casein and a mixture of them to equal parts are prepared with sodium hydroxide high protein-containing alkaline solutions. Sunflower seed globulin forms temporally a gel phase. After this phase the solution of sunflower seed globulin shows like casein and a mixture of sunflower seed globulin/casein (I:I) pseudoplastic flow. The flow curves of the pseudoplastic solutions are described mathematically with the OSWALDian power statement. By alkaline solutions of casein and sunflower seed globulin/casein (I:I) the flow exponent n is distributed statistically about 0.9, by solutions of sunflower seed globulin a distribution exists about the mean values n = 0.85 and n = 0.50. lg k depends in all protein solutions on the concentration of protein, sodium chloride, sodium hydroxide and on the temperature and time. For all protein solutions exists a linear relation between the logarithm of viscosity and the reciprocal temperature for lg k and I/T, which is derived normally for NEWTONian flow behaviour. In a suitable scope of spinning for all protein solutions are carried out complete factorial experiment, which guide to regression equations of lg k; in the case of sunflower seed globulin are calculated also a regression equation of the flow exponent n. Going out from the parameters of the spinning process the properties of the spun sunflower seed globulin/casein (I:I) fibers are described.
mesh_terms: D002364:Caseins; D005916:Globulins; D006368:Helianthus; D008433:Mathematics; D014674:Plant Proteins, Dietary; D011489:Protein Denaturation; D012212:Rheology; D012639:Seeds; D012972:Sodium Hydroxide; D013696:Temperature; D013997:Time Factors; D014783:Viscosity
chemical_list: D002364:Caseins; D005916:Globulins; D014674:Plant Proteins, Dietary; D012972:Sodium Hydroxide
vernacular_title: Zur Rheologie und Verspinnung alkalischer Lösungen aus Sonnenblumensaatglobulin und Casein