Spectral absorption measurements for determination of ease of formation and stability of oil in water emulsions

Ease of formation and stability of oil (D-Limonene) in water emulsions have been studied and determined by measuring the spectral absorption of diluted emulsions at two wavelengths (800 nm and 400 nm). Stability indices were derived from measurements carried out 24 hours after preparation at room temperature (R₁) and after an additional 8 hours of incubation at 75°C (R₂). Various factors affecting emulsion stability, such as type of emulsifier and required HLB, oil concentration, and amount of emulsifier and the method of preparation were tested using this method.