Surface activity of soyasaponin A1

• Published in: Nippon Nōgeikagaku Kaishi Vol. 63; no. 1; pp. 43 - 47
• Main Authors: Gohtani, S. (Kagawa Univ., Miki (Japan). Faculty of Agriculture), Kanazawa, M, Yamano, A, Yamano, Y
• Format: Journal Article
• Language: Japanese
• Published: Japan Society for Bioscience, Biotechnology, and Agrochemistry 01.01.1989
• Subjects: EMULSIFICACION; EMULSIFICATION; EMULSIFYING; SAPONINAS; SAPONINE; SAPONINS; SOJA; SOYBEANS; SURFACE ACTIVE AGENTS; SURFACTANT; SURFACTANTES
• ISSN: 0002-1407; 1883-6844
• DOI: 10.1271/nogeikagaku1924.63.43

The surface activity of soyasaponin A1 (SA1) and the stability of the emulsion prepared with SA1 were compared with those of soyasaponin I (SI). The surface tension of the aqueous SA1 solution decreased slightly with increased saponin content, and was slightly higher than that of SI solution. The surface excess concentration of SA1 solution was much lower than that of SI. A stable foam was not obtained from aqueous SA1 solution. The interfacial tension of SA1 at the water/kerosine interface decreased remarkably to 0.3mM with SA1 and then decreased slightly above that level. The interfacial tension of SA1 was higher than that of SI. The interfacial excess concentration of SA1 was much lower than that of SI. The type of SA1-water/kerosine (1:1) emulsion was O/W, and the creaming stability of the SA1 emulsion increased considerably to 0.3mM with saponin content and increased slightly above 0.3mM. The creaming stability of SA1 was lower than that of SI. The average droplet diameter of SA1 emulsion was greater than that of SI emulsion. The ratio of oil layer separated by centrifuging SA1 emulsion to total solution was much higher than that of SI emulsion.