Sensory Evaluation and Oxidative Stability of a Suncream Formulated with Thermal Spring Waters from Ourense (NW Spain) and Sargassum muticum Extracts

Abstract

Abstract:The purpose of this work was to evaluate four thermal spring waters from Ourense and a Sargassum muticum extract as cosmetic ingredients for the preparation of a suncream. The thermal spring waters were tested for their suitability as an aqueous phase main component, and the algal extract was added as an antioxidant instead of using synthetic preservatives in the cosmetic formula. The emulsion was tested for lipid oxidation during a period of 9 months and for consumer acceptance by performing a sensory test on controls and blanks. Further, color parameters were considered, and a pH determination was performed. The S. muticum extract protected from primary and secondary oxidation as efficiently as Fucus sp. or α-tocopherol extracts. In addition, the sensorial test revealed that consumers preferred suncreams prepared with the S. muticum extract and with thermal spring water from O Tinteiro and A Chavasqueira. The pH of the suncreams varied with the selection of the ingredients, and no oscillations in colorimetric values were visually observed. Our results indicate that the algal extract and the thermal spring waters from Ourense are potential cosmetic ingredients, since they showed effectiveness as antioxidant ingredients, and the suncreams were well accepted by consumers.

Seaweeds as Source of Bioactive Substances and Skin Care Therapy—Cosmeceuticals, Algotheraphy, and Thalassotherapy

“…For instance, the treatment with the ethyl acetate fraction (EtOAc) of Sargassum muticum extract evidently augmented the proliferation of dermal papilla cells (DPCs) and decreased the 5α-reductase activity [259]. Moreover, S. muticum extract can be effectively added as antioxidant ingredient in sun cream with well acceptance by consumers [260].…”

The key role of thermal waters in the development of innovative gelled starch-based matrices

“…An important source of these thermal and mineral waters is the Ourense province (Northwest of Spain), whose high thermal flow makes it the second city in Europe. Although a wide range of uses has been acknowledged since ancient times, the therapeutic value of the hot springs in Ourense has attracted increased attention in the last decade (Balboa et al, 2017;Delgado-Outeiriño et al, 2009). Later authors proposed their proper application to formulate sunscreen creams enriched with algal extracts of Sargassum muticum.…”

Biologically active properties of plant extracts in cosmetic emulsions

“…Table 3.3. Table 3.3 indicate that the emulsion before and after the addition of investigated extracts meet the requirements specified in literature for cosmetics formulations [20,21] .…”

“…The antioxidant activity of the extracts and samples of the cosmetic emulsion with the addition of extracts was determined by the Oyaizu method (FRAP method) [18] and by the ability of antioxidants to Organoleptic (appearance, color, odor), physical and chemical properties (colloidal and thermal stability, pH) samples of cosmetic emulsion were determined according to literature [19][20][21] .…”