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Chitosan and Protasan® Polymeric dispersions: Physical properties and effect on microparticle size
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Chitosan beads loaded with essential oils in cosmetic formulations
No full textThe aim of this work is to evaluate the stability and release of chitosan beads loaded with volatile molecules of Mentha piperita essential oil (E.O.) in a cosmetic formulation. The ability of the beads to quickly release Mentha piperita E.O. during use of a cosmetic formulation such as a bath foam will also be assessed. The chitosan beads were produced with three different chitosan dispersions gelled with two different gelling solutions: a) a 10% solution of sodium hydroxide (NaOH) and b) a 4% solution of sodium tripolyphosphate (TPP). A few properties of six bead samples loaded with Mentha piperita E.O. were assessed. The properties were morphology, size, swelling ability, encapsulation efficiency, stability in time, and fast release of Mentha piperita E.O. during the use phase of the cosmetic formulation
Physical properties of chitosan dispersions in glycolic acid
No full textEvaporation-freezing and rheological behaviour of chitosan dispersions at different temperatures and with different molecular weights using glycolic acid as anionic systems were studied. Chitosans 2.000.000 (HC), 750.000 (MC) and 70.000 (LC) were employed alone or as mixtures (HC/MC, HC/LC, MC/LC 1:1 w/w). Different concentrations of glycols were added to these base dispersions (propylene glycol and glycerine) to investigate how the above physical properties change.
The different rheological and evaporation-freezing behaviours of chitosan dispersions were related both to the molecular weight of chitosan and the vehicle composition of the dispersions. Particularly, the rheological study showed a pseudoplastic and shear thinning behaviour for all chitosan dispersions with flow index values n, tending to < 1 at increasing molecular weights. Chitosans dispersions containing glycols showed lower apparent viscosity values than the base dispersions of the corresponding chitosans, but the water loss and the freezing point were lower especially for chitosan dispersions containing glycerine. This work presents a wide range of dispersion series from which to choose the most suitable to formulate pharmaceutical and cosmetic products
Chitosan-beads loaded with Boswellia Serrata extract as phytoterapic anti-inflammatory agent
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