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Omid Ahmadi,Hoda Jafarizadeh-Malmiri 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.6
Thyme oil in water nanomulsion was preparedunder subcritical water conditions using water and saponin,as solvent and emulsifier, respectively. Gas chromatographyrevealed that there were 44 bioactive components inthe extracted thyme essential oil which, thymol and carvacrolwere two mains of them. Experiments weredesigned based on central composite design and effects ofamounts of saponin and thyme essential oil were evaluatedon particle size, polydispersity index (PDI) and zetapotential of the prepared nanoemulsions using responsesurface methodology. Obtained results revealed that moredesirable thyme oil nanoemulsions with minimum particlesize (184.51 nm) and PDI (0.514), and maximum zetapotential (- 22.51 mV) were prepared using 0.94 g ofsaponin and 0.28 mL of thyme essential oil. Furthermore,results indicated that prepared nanoemulsion usingobtained optimum production conditions had relativelyhigh antioxidant activity (24%) and high antibacterial andantifungal activities against Staphylococcus aureus andPenicillium digitatum.
Azizeh Jafari,Navideh Anarjan,Hoda Jafarizadeh-Malmiri 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.3
A bottom-up approach based on solvent-displacement technique was used to prepare a-tocopherol nanoemulsions. Effects of two main evaporation parameters namely, rotation speed (1 9 10–9 9 10 rpm) and rotation time (5–15 min) of utilized vacuum rotary evaporator, on the mean particle size, polydispersity index (PDI) and a-tocopherol degradation of the formed nanodroplets were evaluated using response surface methodology. Obtained results suggested three polynomial regression models for predicting the studied response variables’ affected by selected evaporation parameters. Relatively high coefficients of determination for suggested models ([0.7839) confirmed the suitability of the generated models. Multiple-optimization procedure revealed that the optimum amounts of evaporation speed and time were 30 rpm and 10 min, respectively, which in that, prepared spherical a-tocopherol nanoemulsions had mean particle size, PDI and concentration values of 48.9 nm, 0.232 and 358.7 mg/L, respectively.