No abstract

Decylglucoside is a non-ionic, non-toxic, biodegradable surfactant. This work aimed to establish composition where stable microemulsions could form using hydrophilic lipophilic deviation (HLD) concept to optimise the formulations. Scanning for suitable ratios of surfactant and co-surfactant was carried out by altering the surfactant/co-surfactant (S/CoS) ratios with two co-surfactants and seven different oils in order to find the optimum formulations. From the optimal S/CoS ratios, pseudo-ternary phase diagrams by dilution were subsequently performed, leading to obtain microemulsion zones. The zones of microemulsions could be observed in the systems composed of decylglucoside/sorbitan monooleate/isopropyl myristate/water at the 0.10/0.90 and 0.20/0.80 S/CoS ratios and decylglucoside/sorbitan monooleate /isopropyl palmitate/water at the 0.10/0.90, 0.15/0.85 and 0.20/0.80 S/CoS ratios. The microemulsion zones of two systems were similar and found at high surfactant concentrations. However, the studied decylglucoside microemulsion systems were interesting in drug and cosmetic applications because it consisted of non-ionic surfactant and co-surfactant, resulting low toxic products.

This study aimed to develop green microemulsions (MEs) for loading coenzyme Q10 (CoQ10). Decylglucoside, a surfactant in the group of alkyl polyglycosides (APG), was used in the formulations since it is biodegradable and non-ionic, leading to low toxic products and friendly properties to the environment. Two blank MEs, i.e., M1 and M2 were prepared by simple mixing dicaprylyl ether, decylglucoside, sorbotan monolaurate and water in the concentrations of 70%, 2.5%, 22.5% and 5%, respectively for M1 and 60%, 6%, 24% and 10%, respectively for M2. Afterwards, M1 and M2 were incorporated with 5% CoQ10 to obtained QM1 and QM2, respectively. All samples were studied for physicochemical properties and stability under accelerated condition. It was found that they were transparence and absence of liquid crystals. Their rheological profiles indicated low viscosity and Newtonian flow. After stability test by freeze thaw for 5 cycles, physicochemical properties of M1, M2, QM1 and QM2 were not obviously different from those at the initial. In addition, more than 97% of label amount of CoQ10 were found in both QM1 and QM2 after stability study. The results indicated that the investigated decylglucoside MEs were suitable systems for incorporation with CoQ10.