CHARACTERIZATION OF ZOOGLAN‐115, AN EXOCELLULAR GLYCAN OF Zoogloea ramigera‐115

Abstract

ABSTRACT Zooglan‐115 shows Newtonian flow at a concentration of 0.2% or less, Bingham flow between 0.2 and 0.4%, and mixed flow greater than 0.4%. It was stable in the pH range 3.0–10.0. Zooglan‐115 is compatible with most gum systems such as guar, locust bean, arabic, karaya, xanthan, and tragacanth, but shows an antagonistic effect with cellulose backbone glycans, microcrystalline cellulose, and CMC. A 0.1% solution at 22°C reduced the surface tension of water from 72 dynes/cm to 63 dynes/cm, and also lowered the interfacial tension with winterized soybean oil from 19 dynes/cm to 12 dynes/cm. The combined functional properties of viscoelasticity (and therefore possessing a yield value), surface‐activtity, acid stability, and salt compatability enable Zooglan‐115 to be a good stabilizer/emulsifier when used in oil‐in‐water emulsion systems.