We study colloids of nanobiocomposites (NBC) containing Au nanoparticles (NP) obtained by reduction of gold precursor with functional groups of κCAR. The AuNPs content was changed from 2.0 to 5.6 w/w %. Hydrolysis of κCAR during reduction of gold ions produced carboxylate groups supporting nanobioconjugation (FT-IR data) and electrostatic stabilization through increased negative ζ-potential. The self-assembly of AuNPs took place after storing NBC, as shown by UV/vis. extinction and transmission electron microscopy. Analysis of the structure-sensitive R _g/R _h ratios obtained by dynamic and static light scattering showed that the colloids have core-shell structure. The macromolecules in the shell exhibited polyelectrolyte expansion at [NaCl] and [KCl] < 0.02 M. Above 0.02 M, the difference between non-specific sodium and specific potassium ions on the shell thickness was registered. The temperature hysteresis of the hydrodynamic radius R _h was similar to that of the pristine κCAR observed previously by optical rotation. Monitoring the equilibration of light scattering intensity at each mini-quenching step of the cooling run allowed further insight into the hysteresis origin. These colloids are interesting for sensing applications because of enhanced scattering of plasmonically coupled AuNPE. Their thermo- and ion-sensitivity can be useful in drug delivery.