What is the role of xanthan gum？
1 suspension and emulsification xanthan gum for insoluble solids and oil droplets suspended with good effect . Xanthan gum sol binding molecules can form a super helical ribbon copolymer constituting a mesh structure similar to the fragile plastic , it is possible to form the solid support particles , droplets and bubbles , the emulsion showed a strong stabilizing effect and a high suspension capacity. 2 good water-soluble xanthan gum can quickly dissolve in water , have a good water solubility. In particular it can be dissolved in cold water, eliminating the need for complicated process easy to use. However, because it has a strong hydrophilic , if added directly to the water is small and insufficient stirring , into the outer micelle swelling , prevents moisture from entering the inner layer , thus affecting the action of the play, attention must be used properly. Xanthan gum powder or salt , sugar and other dry materials and mix well after being stirred slowly adding water to promote feeding , prepare a solution to use. Xanthan gum solution thickening 3 having a low concentration of high viscosity characteristics (viscosity of 1% aqueous solution of gelatin 100 times ) , is an efficient thickener. 4 pseudoplastic aqueous solution of xanthan gum has a static high or low shear viscosity at high shear viscosity performance of the sharp decline , but the molecular structure unchanged . When the shear force is removed, then immediately restore the original viscosity. Relationship between viscosity and shear is entirely plastic. Pseudoplastic Xanthan gum is very prominent , the stability of such pseudoplastic suspensions , emulsions is extremely effective. 5 . Viscosity on the thermal stability of xanthan gum solution does not change with temperature change a lot , usually by heating the viscosity polysaccharides will change , but the aqueous xanthan gum viscosity of between 10-80 ℃ almost no change , even in a low concentration aqueous solution over a wide temperature range is nevertheless showed stable high viscosity . 1% xanthan gum solution ( containing 1% KCl ) of 25 ℃ heated to 120 ℃. Its viscosity is only reduced by 3 %. 6 . Stability of xanthan gum solution pH of acid is very stable, is called its viscosity unaffected PH 5-10 , there is a slight change in viscosity at PH greater than 4 and 11 . In the PH3-11 range , so that the maximum and minimum values of the viscosity difference of less than 10 %. Xanthan gum can be dissolved in a variety of acid solution , such as 5 % sulfuric acid , 5% nitric acid , 5% acetic acid , 10% hydrochloric acid and 25% phosphoric acid , xanthan gum , and the acid solution is quite stable at room temperature , several months parts qualitative change still does not occur. Xanthan gum is also soluble in sodium hydroxide solution , and a thickening properties. The resulting solution is stable at room temperature . Xanthan gum may be a strong oxidizing agent , such as perchloric acid, persulfuric acid degradation with increasing temperature , accelerated degradation . 7 The stability of the xanthan gum solution and the salt can be much salt solution ( potassium, sodium , calcium, magnesium , etc. ) immiscible viscosity affected. Under conditions of high salt concentration , even in a saturated salt solution which remains without precipitation and flocculation solubility , its viscosity is hardly affected. 8 enzymatic hydrolysis stability for xanthan gum stable double helix structure so that it has strong antioxidant and anti- enzymatic capabilities of many enzymes such as protease , amylase, cellulase and hemicellulase do not make xanthan gum enzyme degradation .
