Effect of Coconut Oil and Surfactants on Stability of Nanoemulsions

Abstract:

The objective of this study was to investigate the effect of coconut oil and different surfactants on stability of nanoemulsions that were prepared by simple homogenization (13,500 rpm, 10 minutes). Coconut oil, sunflower oil and castor oil at the concentration of 20-40% w/w were used as the oil phase. Polysorbate 20, polysorbate 80 and Cremophore RH40 were used as surfactant whereas sorbitan monooleate and polyethylene glycol 400 were used as co-surfactants. The formulations containing coconut oil in the range of 20-40% w/w and the ratio of polysorbate 80 to sorbitan monooleate of 2:1 and 3:1 provided nanosized emulsions (100-500 nm). The zeta potential values ranged from-41.51 to-16.97 mV. The prepared nanoemulsions were stable for at least 7 days at 8 °C. The temperature cycling test (storage at 4 °C for 24 hours and at 45 °C for 24 hours) was performed. It was found that the formulation containing 30% w/w of coconut oil, 22.5% w/w of polysorbate 80 and 7.5% w/w of sorbitan monooleate was stable for 1 cycle. The results indicated that a decrease in the concentration of surfactant and an increase in the concentration of oil affected the stability of nanoemulsions.

• Periodical: Advanced Materials Research (Volume 506)
• Pages: 429-432
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.506.429
• Online since: April 2012
• Authors: Suchada Piriyaprasarth, Pornsak Sriamornsak, Gaysorn Chansiri, W. Promboot, U. Imerb, D. Sumpoung
• Keywords: Coconut Oil, Nanoemulsion, Stability, Surfactant

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