FAQs

High-acyl gellan gum is generally opaque, while low-acyl gellan gum is transparent because the production process of low-acyl gellan gum includes a filtration step to remove insoluble proteins, cell debris, PHB, and other insoluble impurities. The filtration aid typically used is diatomite. During the process, a high-acyl gellan gum aqueous solution is prepared at approximately 1.5% concentration, and the pH is adjusted to about 10.0. The solution is then maintained at around 90°C for 10 minutes to ensure complete deacylation. Afterward, the concentration of gellan gum is adjusted to about 1%, and the solution is filtered through a high-temperature plate-and-frame filter at 90°C, where the diatomite retains most insoluble impurities. Some soluble proteins can also cause issues with product quality. To address this, methods such as adjusting the isoelectric point of the proteins are employed. By setting the solution pH to the isoelectric point before plate-and-frame filtration, soluble proteins are also removed.


High acyl gellan gum Deacylation             Filtration under high temperature       Clear Low acyl gellan gum obtained

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