Controlled release of L-tryptophan and Vitamin B2 from model water/oil/water multiple emulsions

Richard Owusu, Qinhong Zhu, Eric Dickinson

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Stability and nutrient release from model water/oil/water (W/O/W) multiple emulsions based on kerosene oil, Span 80 and Tween 20 were studied. Multiple emulsion internal and external droplet sizes were ~1 and 7.5 μm respectively. The initial encapsulation yield was 92–98%. The apparent yield stability decreased to 85–87% after heating at 80°C for 20 min. The release of a nutrient, L-tryptophan (L-Trp) or riboflavine-5′-monophosphate (Vitamin B2), from the W/O/W multiple emulsions was found to conform to first order kinetics for studies performed at pH 2–10. The rate of release was generally greater near the isolectric point of L-Trp or Vitamin B2. The permeability coefficient for nutrient release was in the range 0.32–1.92 × 10−10 cm/s. This was 105–106-fold lower than the estimated permeability coefficient for water transfer across a W/O/W multiple emulsion oil phase. Therefore, we conclude that processes of nutrient release and water transfer within a W/O/W multiple emulsion occur via different routes.
LanguageEnglish
Pages443
JournalFood Hydrocolloids
Volume6
Issue number5
DOIs
Publication statusPublished - 1992

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Riboflavin
Vitamins
riboflavin
Emulsions
Tryptophan
tryptophan
emulsions
Oils
oils
Water
water
Nutrients
Food
Hydraulic conductivity
nutrients
Permeability
permeability
Kerosene
kerosene
Polysorbates

Cite this

Owusu, Richard ; Zhu, Qinhong ; Dickinson, Eric. / Controlled release of L-tryptophan and Vitamin B2 from model water/oil/water multiple emulsions. 1992 ; Vol. 6, No. 5. pp. 443.
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Controlled release of L-tryptophan and Vitamin B2 from model water/oil/water multiple emulsions. / Owusu, Richard; Zhu, Qinhong; Dickinson, Eric.

Vol. 6, No. 5, 1992, p. 443.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Controlled release of L-tryptophan and Vitamin B2 from model water/oil/water multiple emulsions

AU - Owusu, Richard

AU - Zhu, Qinhong

AU - Dickinson, Eric

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N2 - Stability and nutrient release from model water/oil/water (W/O/W) multiple emulsions based on kerosene oil, Span 80 and Tween 20 were studied. Multiple emulsion internal and external droplet sizes were ~1 and 7.5 μm respectively. The initial encapsulation yield was 92–98%. The apparent yield stability decreased to 85–87% after heating at 80°C for 20 min. The release of a nutrient, L-tryptophan (L-Trp) or riboflavine-5′-monophosphate (Vitamin B2), from the W/O/W multiple emulsions was found to conform to first order kinetics for studies performed at pH 2–10. The rate of release was generally greater near the isolectric point of L-Trp or Vitamin B2. The permeability coefficient for nutrient release was in the range 0.32–1.92 × 10−10 cm/s. This was 105–106-fold lower than the estimated permeability coefficient for water transfer across a W/O/W multiple emulsion oil phase. Therefore, we conclude that processes of nutrient release and water transfer within a W/O/W multiple emulsion occur via different routes.

AB - Stability and nutrient release from model water/oil/water (W/O/W) multiple emulsions based on kerosene oil, Span 80 and Tween 20 were studied. Multiple emulsion internal and external droplet sizes were ~1 and 7.5 μm respectively. The initial encapsulation yield was 92–98%. The apparent yield stability decreased to 85–87% after heating at 80°C for 20 min. The release of a nutrient, L-tryptophan (L-Trp) or riboflavine-5′-monophosphate (Vitamin B2), from the W/O/W multiple emulsions was found to conform to first order kinetics for studies performed at pH 2–10. The rate of release was generally greater near the isolectric point of L-Trp or Vitamin B2. The permeability coefficient for nutrient release was in the range 0.32–1.92 × 10−10 cm/s. This was 105–106-fold lower than the estimated permeability coefficient for water transfer across a W/O/W multiple emulsion oil phase. Therefore, we conclude that processes of nutrient release and water transfer within a W/O/W multiple emulsion occur via different routes.

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