The Influence of Different Concentrations of a Natural Clay Material as Active Principle in Cosmetic Formulations

Abstract

The clay minerals have characteristics and properties that allow their applicability in the cosmetic area, being incorporated into formulations as an active principle. Therefore, the aim of this work is characterizing and evaluating the influence of a clay from Miracema do Norte, Tocantins, Brazil, named Clay V, on the physicochemical characteristics of a hydrophilic gel of Aristoflex  , a copolymer of the neutralized acryloyldimethyltaurate and vinylpyrrolidone sulphonic acid. Clay V was decontaminated and characterized through microbiological evaluation, crystalline phases present by X-Ray Diffraction (XRD), chemical composition by X-Ray Fluorescence (XRF), thermogravimetric analysis (TGA) and granulometric distribution by sieving. Gels were prepared using Clay V with particles in the range ≤ 180 μm in three different concentrations: 1%, 3% and 5% (w/w) and a standard gel without clay. The formulations were evaluated according to organoleptic characteristics, pH, viscosity, spreadability and the centrifugation test. The microbiological evaluation showed that the clay sample is in compliance with the parameters established by the legislation. The following mineral phases were identified by XRD: kaolinite, illite, vermiculite and quartz, mainly composed of silica and alumina according to XRF. Thermal analysis showed that the clay has two thermal decomposition reactions, the largest being 547.6°C. The granulometric analysis identified that the largest fraction (63.22%) was of particles with sizes greater than 710 μm. The organoleptic characteristics presented by the formulations were suitable, with characteristic gel odor, homogeneous appearance, soft and refreshing texture and staining based on the concentration of Clay V used. The obtained pH values were within the range between 5.5 and 6.5, and it was verified that the gel has high spreadability, distributing evenly on the skin. The values obtained for viscosity showed that the formulations are non-Newtonian fluids with pseudoplastic behavior. The centrifugation test showed that the formulations are stable, with no phase separation. The results obtained with the tests showed that the natural clay V material is beneficial in cosmetic products and can be used for incorporation in cosmetic gel formulations of Aristoflex  type.

Bacteria Single-Cell and Photosensitizer Interaction Revealed by Quantitative Phase Imaging

“…Photosensitizers immobilized within a polymer matrix were used to obtain and utilize an antimicrobial photoactive material. As a polymer, the ammonium acryloyldimethyltaurate copolymer (AVC), being a rheology modifier widely used in pharmacology and dermatology, was applied [ 34 , 35 , 36 ]. The modifier is a copolymer that consists of acrylamido-2,2-dimethylpropanesulfonic acid and vinylpyrrolidone, with an alternating arrangement within the macromolecule.…”

A New Hyaluronic Emulgel of Hesperetin for Topical Application—An In Vitro Evaluation

“…The aim of this work was to provide an effective formulation strategy for enhanced skin retention of a highly lipophilic molecule, such as hesperetin, to have the potential to provide topical formulations for the skin. In that context, a hyaluronic emulgel could be the ideal vehicle, as an emulsion allows for the incorporation of hydrophilic/lipophilic substances due to its biphasic nature, and hyaluronic acid permits the retention of active substances longer on the skin, prolonging their action [32]. Additionally, semi-solid formulations prepared using this polymer are characterized by excellent sensory and rheological properties and have shown excellent qualities as wound-healing formulations [33,34].…”

The Scenario of Clays’ and Clay Minerals’ Use in Cosmetics/Dermocosmetics

“…According to Daneluz and co-workers (2020), in general, clay minerals contain Si, Al, Fe, Ti, Mg, Ca, K, Na, phyllosilicates, oxides, carbonates, kaolinite, chlorides etc. According to the authors, these elements are important for Cosmetology due to their effect on skinexamples: hematite (Fe2O3) acts as pigment, opacifier, antiseptic and stimulates cell renewal; rutile (TiO2) provides photoprotection; kaolinite provide reconstruction of skin tissues, hydration, and soothing effect; and ZnO and MgO are invigorating [18].…”

“…As actives, they are widely used for skin cleansing, oil reduction/control (skin and scalp), substance adsorption, antiaging, ultraviolet (UV) radiation protection (sunscreens), and ion exchange with skin, due to their color, qualitative and quantitative mineralogical composition, particle size and shape, structure, and ion exchange capacity. They can also be used in makeup products [2,[15][16][17][18].…”