45-7 |
Keltrol® K0B619: A new form of xanthan gum with enhanced properties |
N. A. MORRISON, Food Applications, CP Kelco, 8355 Aero Dr., San Diego, CA 92123-1716, W. G. Rakitsky, Business Development, CP Kelco, 8355 Aero Dr., San Diego, CA 92123-1716, and T. Talashek, Biopolymer & Analytical Chemistry, CP Kelco, 8355 Aero Dr., San Diego, CA 92123-1716. Xanthan gum is a viscous polysaccharide produced by fermentation of the bacterium Xanthomonas campestris. The efficient stabilization and suspension properties of xanthan are related to its structural features: high molecular weight and extended conformation, resulting from its stiff cellulosic backbone and double helical conformation. New studies have shown that the level of acetate and pyruvate substituents on xanthan gum can affect both structural and functional properties. Differential Scanning Calorimetry and Atomic Force Microscopy results show that this new differentiated xanthan gum adopts a less ordered, more flexible conformation. These conformational changes result in a novel product, which has enhanced functional properties. First, this new xanthan gum has superior interaction with galactomannan polymers such as guar and locust bean gum. Not only do blends of K0B619 with galactomannan have higher viscosity, they also retain more of that viscosity in high ionic strength environments such as sauces, dressings. Second, K0B619 has superior acid stability when compared to conventional xanthan gum. In applications such as carbonated beverages that can have pH values of 2.5 and lower, this new form of xanthan gum can retain up to 50% more of its viscosity compared to standard xanthan in long-term storage studies. Finally, the overall viscosity of this new xanthan gum is higher than the commercial product being offered today. This higher viscosity can result in lower use levels as well as a more pseudoplastic rheological flow properties. CP Kelco commercialized a food grade version of K0B619 in March 2001 and sales resulted shortly after its introduction.
Session 45, Ingredients
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