碩士 / 國立臺北科技大學 / 有機高分子研究所 / 100 / In this work, Eucalyptus Oil and Sodium Alginate are used as a core and wall membrane material for the production of Calcium Alginate encapsulated Eucalyptus Oil microcapsules, which has been done by the orifice method. It is possible to prepare the micron to nano-scale microcapsules and uniform particle size by combining the Electro spray technique with orifice method. This work investigates the formation and particle size distribution of microcapsules, the encapsulation efficiency of the Eucalyptus Oil, and the release behavior of the encapsulated Eucalyptus Oil.
Here the experimental work is divided into three parts which are electrospray emulsion configuration, preparation of calcium alginate microcapsules and preparation of eucalyptus oils / calcium alginate microcapsules.
(I) Electrospray emulsion configuration: From the experimental results, it can be found that the emulsification is improve the stability of the Eucalyptus Oil with the Sodium Alginate. The emulsion stability increases when the amount of surfactant (SLS) increases. From centrifugation stability test analysis and temperature stability test analysis, it has been predicted that the best stability of the emulsion ratio (O/W/SLS) is 1.00:1.00:4.00. The emulsion does not show the phenomenon of oil-water separator after 20.00 minutes centrifugation process. It can be preserved the emulsion stability at room temperature for 6 days, and emulsion stability up to 11 days is also possible at low-temperature.
(II) Preparation of Calcium Alginate microcapsules: This part is discussing the electrospray parameters on the formability of the microcapsules and the relationship of particle size distribution, and also identifies the best electrospray parameter conditions for capsule production. From the results, the best electrospray conditions was found as follows: operating voltage is 20.00 kV, T-C distance (needle to the collector plate distance) is 5.00 cm, the feed rate is 1.00 mL/hr., This condition is produce the complete shell formation on microcapsule with the average particle sizes of 314.43 μm.
(III) Preparation of Eucalyptus Oils / Calcium Alginate microcapsules: it explains the experimental procedure for measuring the encapsulation efficiency of Eucalyptus Oil and the release behavior of the encapsulated Eucalyptus Oil. From the experimental results, different emulsion proportion (O/W/SLS) of Eucalyptus Oil coating was caused by only micro effects. When the amount of surfactant (SLS) is increased from 0.20 mL to 0.80 mL , the encapsulation efficiency of Eucalyptus Oil is increase from 90.10 % to 93.90 %. The electrospray parameters (ex:operating voltage) change caused the significant changes in particle size of the microcapsules, but does not affect the coating of Eucalyptus Oil for the operating voltage 0.00 kV to 20.00 kV. Its average encapsulation efficiency falls 91.50 % to 91.70 %.
| Identifer | oai:union.ndltd.org:TW/100TIT05310084 |
| Date | January 2012 |
| Creators | Ling-Chuan Hsu, 許綾娟 |
| Contributors | , 鄧道興, 鄭國彬 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 136 |
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