Stability and rheological behaviour of functional essential oils in glycolipid cream emulsion / Saw Mei Mei
Essential oils carries distinctively unique aroma from parts of a plant where they are extracted. Essential oils have widely been known for its aromatherapy and therapeutic effect on human. High concentration of essential oil comprises of thyme, lavender, tea tree and citronella oil have been ind...
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| 格式: | Thesis |
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2013
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| 在線閱讀: | http://studentsrepo.um.edu.my/4801/1/STABILITY_AND_RHEOLOGICAL_BEHAVIOUR_OF_FUNCTIONAL_ESSENTIAL_OILS_IN_GLYCOLIPID_CREAM_EMULSION.pdf http://studentsrepo.um.edu.my/4801/ |
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| 總結: | Essential oils carries distinctively unique aroma from parts of a plant where they are
extracted. Essential oils have widely been known for its aromatherapy and therapeutic
effect on human. High concentration of essential oil comprises of thyme, lavender, tea
tree and citronella oil have been induced in emulsions system using olive oil as carrier
oil stabilized by glycolipid surfactants of sucrose stearate, surcrose palmitate and
sucrose myristate respectively. Co-surfactants, TritonTM X-100 and TritonTM X-45 was
utilised to create high interactions and compatibility associated with short chain
terpenes, terpenoids and phenolic compound presents in essential oils inverting
emulsion droplet forming o/w emulsion system. Essential oil emulsions were subjected
to a series of physical properties evaluation specifically accelerated ageing test
conducted at 45.0±0.1 °C, zeta potential, mean droplet size measurement and polarising
microscope observation. Rheological evaluations by mean of oscillatory and
viscometric studies were carried out at constant temperature of 30.0±0.1 °C over the
period of 30 days. Viscometric flow curve shows shear thinning behaviour for all
essential oil emulsions exhibiting reduction of yield stress directly proportionate with
reduction of lipid chain length. Mean droplet size and PDI govern the variation of
viscosity of thyme and lavender oil where large droplet forming uniform distribution
yield high viscosity emulsion possessing strong structural integrity with high critical
strains and G’ magnitude. Frequency dependent shear oscillation display dominancy of
G’ over G” throughout the measured frequency (ω) domain implicates emulsions
system exhibiting solid like behaviour. Thyme and lavender essential oil emulsions
possessing higher G’ and viscosity was concluded to be more stable than tea tree oil and
citronella emulsions. All the emulsion tested possessed a long shelf life sustaining high
emulsion fractions over 30 days of storage. |
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