Abstract
Although the surfactant plays an important role in the preparation of a water-in-oil-in-water (W/O/W) emulsion, its concentration has been determined empirically. We investigated the location of a hydrophilic surfactant in a coarse W/O/W emulsion and a membrane-filtered fine emulsion. At first, appropriate concentrations of some hydrophilic surfactants to prepare a W/O/W emulsion were investigated from the viewpoints of the median diameter of the oil droplets and the encapsulation efficiency of a hydrophilic substance in the inner-water phase. The location of the surfactants and oil was examined for the W/O/W emulsions, prepared using polyglycerol monolaurate as a hydrophilic surfactant in the outer-phase solution at 1-10% (w/v) and octanoic acid triacylglycerol, which contained hexaglyceryl condensed ricinoleate as an oil-phase surfactant in the oil phase. The median diameter of the oil droplets in the W/O/W emulsion reached a minimum value at 3% (w/v) decaglycerol monolaurate (ML-750), and was constant over 4% (w/v). The excess decaglycerol monolaurate, that was not adsorbed on the oil-water interface was distributed to the outer-water and oil phases. The oil and hydrophobic surfactant were dissolved in the outer-phase solution at high concentrations of the hydrophilic surfactant. These results suggest that the hydrophilic-surfactant concentration appropriate for preparing the W/O/W emulsion would be 3% (w/v) in the outer-phase solution and that the location of the components in the W/O/W emulsion would also be useful in estimating the adequate concentration of the surfactant.
| Original language | English |
|---|---|
| Pages (from-to) | 83-90 |
| Number of pages | 8 |
| Journal | Colloids and Surfaces A: Physicochemical and Engineering Aspects |
| Volume | 238 |
| Issue number | 1-3 |
| DOIs | |
| Publication status | Published - May 4 2004 |
| Externally published | Yes |
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Keywords
- Drug delivery system
- Encapsulation efficiency
- Functional food
- Surfactant
- W/O/W emulsion
ASJC Scopus subject areas
- Colloid and Surface Chemistry
- Physical and Theoretical Chemistry
Cite this
Effect of the hydrophilic surfactants on the preparation and encapsulation efficiency in course and fine W/O/W type emulsions. / Shima, Motohiro; Kobayashi, Yohei; Kimura, Yukitaka; Adachi, Shuji; Matsuno, Ryuichi.
In: Colloids and Surfaces A: Physicochemical and Engineering Aspects, Vol. 238, No. 1-3, 04.05.2004, p. 83-90.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Effect of the hydrophilic surfactants on the preparation and encapsulation efficiency in course and fine W/O/W type emulsions
AU - Shima, Motohiro
AU - Kobayashi, Yohei
AU - Kimura, Yukitaka
AU - Adachi, Shuji
AU - Matsuno, Ryuichi
PY - 2004/5/4
Y1 - 2004/5/4
N2 - Although the surfactant plays an important role in the preparation of a water-in-oil-in-water (W/O/W) emulsion, its concentration has been determined empirically. We investigated the location of a hydrophilic surfactant in a coarse W/O/W emulsion and a membrane-filtered fine emulsion. At first, appropriate concentrations of some hydrophilic surfactants to prepare a W/O/W emulsion were investigated from the viewpoints of the median diameter of the oil droplets and the encapsulation efficiency of a hydrophilic substance in the inner-water phase. The location of the surfactants and oil was examined for the W/O/W emulsions, prepared using polyglycerol monolaurate as a hydrophilic surfactant in the outer-phase solution at 1-10% (w/v) and octanoic acid triacylglycerol, which contained hexaglyceryl condensed ricinoleate as an oil-phase surfactant in the oil phase. The median diameter of the oil droplets in the W/O/W emulsion reached a minimum value at 3% (w/v) decaglycerol monolaurate (ML-750), and was constant over 4% (w/v). The excess decaglycerol monolaurate, that was not adsorbed on the oil-water interface was distributed to the outer-water and oil phases. The oil and hydrophobic surfactant were dissolved in the outer-phase solution at high concentrations of the hydrophilic surfactant. These results suggest that the hydrophilic-surfactant concentration appropriate for preparing the W/O/W emulsion would be 3% (w/v) in the outer-phase solution and that the location of the components in the W/O/W emulsion would also be useful in estimating the adequate concentration of the surfactant.
AB - Although the surfactant plays an important role in the preparation of a water-in-oil-in-water (W/O/W) emulsion, its concentration has been determined empirically. We investigated the location of a hydrophilic surfactant in a coarse W/O/W emulsion and a membrane-filtered fine emulsion. At first, appropriate concentrations of some hydrophilic surfactants to prepare a W/O/W emulsion were investigated from the viewpoints of the median diameter of the oil droplets and the encapsulation efficiency of a hydrophilic substance in the inner-water phase. The location of the surfactants and oil was examined for the W/O/W emulsions, prepared using polyglycerol monolaurate as a hydrophilic surfactant in the outer-phase solution at 1-10% (w/v) and octanoic acid triacylglycerol, which contained hexaglyceryl condensed ricinoleate as an oil-phase surfactant in the oil phase. The median diameter of the oil droplets in the W/O/W emulsion reached a minimum value at 3% (w/v) decaglycerol monolaurate (ML-750), and was constant over 4% (w/v). The excess decaglycerol monolaurate, that was not adsorbed on the oil-water interface was distributed to the outer-water and oil phases. The oil and hydrophobic surfactant were dissolved in the outer-phase solution at high concentrations of the hydrophilic surfactant. These results suggest that the hydrophilic-surfactant concentration appropriate for preparing the W/O/W emulsion would be 3% (w/v) in the outer-phase solution and that the location of the components in the W/O/W emulsion would also be useful in estimating the adequate concentration of the surfactant.
KW - Drug delivery system
KW - Encapsulation efficiency
KW - Functional food
KW - Surfactant
KW - W/O/W emulsion
UR - http://www.scopus.com/inward/record.url?scp=2442503712&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=2442503712&partnerID=8YFLogxK
U2 - 10.1016/j.colsurfa.2004.02.018
DO - 10.1016/j.colsurfa.2004.02.018
M3 - Article
VL - 238
SP - 83
EP - 90
JO - Colloids and Surfaces A: Physicochemical and Engineering Aspects
JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects
SN - 0927-7757
IS - 1-3
ER -