Abstract
Sun protection creams were formulated with a commercial rosemary extract and with thermal waters from different springs in the Northwest Spain. A six month stability study was carried out and microbiological and chemical stability, as well as sensorial characteristics, were evaluated. In all creams, the mesophilic count always remained low (under 10 cfu/mL) and most of them showed greater antioxidant stability than the control cream formulated with distilled water. Color was stable during storage in almost all creams. Sensory analysis showed a quite similar valoration of the creams regardless the sex of the panelists, and small differences were found between consumers aged 30–40 and >40. Formulations elaborated from Outariz and A Chavasqueira thermal waters were preferred to those prepared with distilled water as a control.
Highlights
The use of herbal products in the cosmetics sector is increasing as a result of consumer demands for safer and less aggressive compounds and due to the recent interest on replacing synthetic chemicals by natural ingredients
The aim of this work is to prepare sun creams formulated with rosemary extracts added as a commercial natural antioxidant and thermal waters from five sources (As Burgas, Muíño da Veiga, Tinteiro, A Chavasqueira, and Outariz)
Microbiological and physico-chemical analysis were carried out at 0, 3, and 6 months to evaluate the stability of emulsions
Summary
The use of herbal products in the cosmetics sector is increasing as a result of consumer demands for safer and less aggressive compounds and due to the recent interest on replacing synthetic chemicals by natural ingredients. Herbal products may have advantages related to skin benefits, cosmetic preservation, and marketing image. Herbs and spices are effective natural antioxidants [1,2]. Among the herbs of the Labiatae family, rosemary extracts have been extensively studied, are safe for food preservation [3,4], and were the first marketed natural antioxidants with several trade names available. Carnosic acid and rosmarinic acid received much attention, but minor constituents contribute to the biological activities due to synergic effects [6]. Other biological activities of rosemary include antibacterial, antifungal, anticancer, antiinflammatory, antidiabetic, antiulcerogenic, antinociceptive, antidepressant, antianxiety, antithrombotic, antiadipogenic, α-glucosidase inhibitory, ACE inhibitory, and protective effects against neurological disorders [6,8]
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