摘要
Eco-and bio-compatible surfactants could potentially increase the risk of microbial contamination of the formulations in which they are included. In the present work, we characterize the microstructure of an hair conditioner formulation based on the bio-compatible cationic surfactant. Behenamidopropyldimethylamine(BAPDA) and evaluated its in vitro microbiological stability. The mixture presents an isotropic micellar structure, as revealed by Electron Paramagnetic Resonance(EPR) spectroscopy. The Challenge Test results show that the formulation is not sel-preserving, requiring the addition of selected preservatives, whose concentration has to be carefully optimized, to inhibit the growth of contaminating micro-organisms.
Eco-and bio-compatible surfactants could potentially increase the risk of microbial contamination of the formulations in which they are included. In the present work, we characterize the microstructure of an hair conditioner formulation based on the bio-compatible cationic surfactant. Behenamidopropyldimethylamine （BAPDA） and evaluated its in vitro microbiological stability. The mixture presents an isotropic micellar structure, as revealed by Electron Paramagnetic Resonance （EPR） spectroscopy. The Challenge Test results show that the formulation is not sel-preserving, requiring the addition of selected preservatives, whose concentration has to be carefully optimized, to inhibit the growth of contaminating micro-organisms.
