SMALL-ANGLE NEUTRON-SCATTERING STUDIES OF SODIUM DODECYL-SULFATE INTERACTIONS WITH GELATIN .2. EFFECT OF TEMPERATURE AND PH

Structural perturbations and interactions between the anionic surfacta nt sodium dodecyl sulfate (SDS) and the biopolymer and polyampholyte g elatin, have been studied using small-angle neutron scattering. The ef fects of temperature and changes in pH have been investigated. Althoug h the physical properties of the systems change dramatically with temp erature, from a gel at 25 degrees C to a fluid at 65 degrees C, the ef fects on the structure over the dimensions probed by small-angle neutr on scattering are rather weak. Changes in pH, which alter the net char ge of the gelatin, lead to dramatic changes in the scattering for pure gelatin solutions and for surfactant-gelatin mixtures.