碩士 / 國立海洋大學 / 食品科學系碩士在職專班 / 90 / The objectives of the study are to explore the effect of using Monostroma nitidum aqueous extracts (aqueous extracts) on the characteristic, efficacy and safety of lotions containing vitamin C and vitamin E in W/O/W multiple emulsion. The study includes 1. To explore the effect of adding Monostroma nitidum aqueous extracts on the morphorlogy, average droplet size, oil globules distribution, yield and rheological properties of the W/O/W multiple emulsions thus prepared. 2. To explore the efficacy of applying lotions containing W/O/W multiple emulsions on water holding, pH value and sensitivity of the skin.
The result shows that the W/O/W emulsions prepared from different formulas by two-stage emulsification method were multiple structure. The particle size of internal droplet decreased with increasing concentrations of aqueous extracts in the internal aqueous phase. For those emulsions formed whithout aqueous extracts in the internal aqueous phase the particles of internal droplets were bigger and they contacted with oil membrane. The distribution of particle size of W/O/W multiple emulsions studied are all in a narrow range. The W/O/W multiple emulsion containing xanthan gum had a diameter ranging between 11 and 14 μm, with a mean value of 10.59 μm. The W/O/W multiple emulsion containing 2.5 ℅ w/w aqueous extracts in external phase and 0.5 ℅ w/w aqueous extracts in inner aqueous phase had a diameter ranging between 3 and 7 μm, with a mean value of 4.56 μm. The W/O/W yield increased with increasing concentrations of aqueous extracts in the internal aqueous phase. All the multiple emulsions containing xanthan gum or aqueous extract were pseudoplastic fluids.
The apparent viscosity and storage stability increased with increasing concentrations of aqueous extracts in the internal aqueous phase.
The pH value of lotions containing W/O/W multiple emulsions were between 6.82 and 6.85. Skin sensitivity shows no erythema by the Daize score test. The pH value of the skin decreased after applying the W/O/W lotions but regained its normal pH value within 100 mins. The lotions containing aqueous extracts have better water holding than that containing xanthan gum.
| Identifer | oai:union.ndltd.org:TW/090NTOU1253004 |
| Date | January 2001 |
| Creators | Song-Yun Shieh, 謝松筠 |
| Contributors | Rong-Huei Chen, 陳榮輝 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 52 |
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