title: Stretching properties of xanthan and hydroxypropyl guar in aqueous solutions and in cosmetic emulsions.
abstract: Filament stretchability of xanthan gum (XG) and hydroxypropyl guar (HPG) was investigated in aqueous solutions (0.125, 0.25, 0.5, 1, 1.2 and 1.5% w/w) and in O/W emulsions using a texture analyzer. Additionally, rheological characterizations were carried out on the systems and shear and oscillation parameters were used to interpret stretching properties. XG solutions exhibited a solid-like behavior with rheological parameters much higher than for HPG one whatever the concentration. Filament stretching values of XG solutions were superior to HPG for concentration below 1% w/w and then became comparable for higher concentrations. No meaningful relationship was found between rheological and stretching values. Synergy was observed for all XG/HPG mixtures at 0.125, 0.25 and 0.5% influencing both the rheological and the filament stretching values. The 25/75 XG/HPG ratio showed the maximum synergistic effect at all concentrations while the filament stretchability was enhanced in a wider range of ratios. XG and HPG did not present the same behavior in emulsions. No clear synergistic effect was observed and XG markedly influenced the emulsion filament stretching.
authors.affiliation: Université du Havre, URCOM, EA 3221, FR CNRS 3038, 25, rue Philippe Lebon CS 80540, 76058 Le Havre Cedex, France. Electronic address: m_jamshidian@ut.ac.ir.
authors.forename: Majid
authors.initials: M
authors.lastname: Jamshidian
authors.affiliation: Université du Havre, URCOM, EA 3221, FR CNRS 3038, 25, rue Philippe Lebon CS 80540, 76058 Le Havre Cedex, France. Electronic address: geraldine.savary@univ-lehavre.fr.
authors.forename: Géraldine
authors.initials: G
authors.lastname: Savary
authors.affiliation: Université du Havre, URCOM, EA 3221, FR CNRS 3038, 25, rue Philippe Lebon CS 80540, 76058 Le Havre Cedex, France. Electronic address: michel.grisel@univ-lehavre.fr.
authors.forename: Michel
authors.initials: M
authors.lastname: Grisel
authors.affiliation: Université du Havre, URCOM, EA 3221, FR CNRS 3038, 25, rue Philippe Lebon CS 80540, 76058 Le Havre Cedex, France. Electronic address: celine.picard@univ-lehavre.fr.
authors.forename: Céline
authors.initials: C
authors.lastname: Picard
mesh_terms: D003358:Cosmetics; D004655:Emulsions / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D011135:Polysaccharides, Bacterial / Q000737:chemistry*; D012212:Rheology / Q000379:methods; D012996:Solutions; D014867:Water
chemical_list: D003358:Cosmetics; D004655:Emulsions; D011134:Polysaccharides; D011135:Polysaccharides, Bacterial; D012996:Solutions; C519976:hydroxypropyl guar; D014867:Water; C002563:xanthan gum
keywords: Filament stretching; Hydroxypropyl guar; O/W emulsion; Rheology; Synergy; Xanthan gum