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Mixed monolayers of acylglycerols on sugar aqueous solutions

✍ Scribed by Julia de la Fuente Feria; Juan M. Rodríaguez Patino

Publisher
American Institute of Chemical Engineers
Year
1996
Tongue
English
Weight
734 KB
Volume
42
Category
Article
ISSN
0001-1541

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✦ Synopsis

Structural characteristics of mono-and distearin mixed monolayers spread on aqueous solutions containing sugar (glucose or sucrose) at 0.5 mol/L were studied as a function of temperature and integacial and subphase compositions. The compression isotherms were obtained using an automated Langmuir-type film balance over a temperature range of 10 to 40°C. The results show an expansion in the structure of the mixed monolayer with sugar in subphase. Nonideal mixing of the component at interface was observed with positive deviation from the additivity rule. This fact is indicative of the presence of repulsive interactions between the two lipids on sugar aqueous solutions. The mixed monolayers with a monostearin molar fraction less than 0.8 are stable from a thermodynamic point of uiew. Mixed monolayer stability depends on monolayer composition, temperature, and surface pressure with diflerent order of magnitude.

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