Carrageenan and xanthan gels were
successfully tested with and without active
ingredient. Amplitude sweeps showed large
limiting values for the viscoelastic domain in the
xanthan gels and a gel character over the entire
domain of deformation. Even if carrageenan gels
presented lower limiting values of the linear
viscoelastic domain and cross-over points could
be found for all the tested samples, it seems that
adding acid extract of Ns would improve the
rheological properties of the gels.