A rheological approach of seawater-based natural cosmetics with extracts from sonicated medicinal herbs

Abstract

An eco-friendly ultrasound assisted extraction of high-valuable compounds from four medicinal herbs such as thyme, sage, lavender and rosemary with their corresponding characterization was studied. A rheological approach of the proposed seawater based personal care products prepared in the presence of these soluble extracts was addressed without jeopardizing their technological aptitude. Results indicated that soluble extracts from thyme exhibited the highest phenolic content and antiradical potential (>30 g gallic acid equivalent/100 g extract, >130 g Trolox equivalent/100 g extract, DPPH - IC50: 0.37 g/L). Color testing showed that seawater-based both body milk and shampoo formulations incorporated with soluble extracts featured light ocher brown systems, achieving the darkest color for those made in the presence of extracts from thyme. Rheological outcomes indicated that the developed matrices with extracts from medicinal herbs exhibited at rest solid-like structure for body milks and liquid-like for shampoos with magnitudes comparable to their synthetic counterparts, being those added with thyme extracts the ones that featured the smoothest viscous profiles. These matrices suggested the enhancement of features for applicability and processing. The proposed cosmetics also showed neither hysteresis nor syneresis for a month stored at room temperature and in the cold.