Unveiling the Secrets of Xanthan Gum: Our Analysis, Your Confidence

At CD BioGlyco, we have experts in the field of Pharmaceutical Excipient Analysis and have developed a pharmaceutical analysis team to provide quality xanthan gum analysis services to our clients worldwide. Xanthan gum is a biopolymer polysaccharide derived from the fermentation of sugar by Xanthomonas spp. microorganisms, with good viscosity and excellent rheological properties, non-toxic and non-pharmacological. Xanthan gum is also an excellent new excipient for pharmaceutical preparations, e.g. as a carrier for slow-release tablets.

• Basic properties
  Xanthan gum is a white to yellowish powder that dissolves in water to form a colloidal solution. And, xanthan gum is insoluble in ethanol and acetone.
• Identification
  The sample to be identified is mixed with locust bean gum and water is added to make a solution. Upon heating-cooling the solution, if a rubbery gel appears, the sample is xanthan gum.
• Viscosity
  The aqueous solution of xanthan gum is stirred well after adding an appropriate amount of potassium chloride to it. After some time, the viscosity is determined using a rotational viscometer.
• Pyruvic acid content
  We use ultraviolet-visible spectrophotometry to quantify pyruvic acid in xanthan gum (absorbance measured at 375 nm). In addition, we use sodium carbonate solution as a control to ensure the accuracy of the experiment.
• Nitrogen content
  Semi-micro method: After the xanthan gum antigenic digestion reaction, we titrate it using a sulphuric acid solution. During the titration, we use methyl red-bromocresol green mixture as an indicator. The titration is stopped when the color of the whole solution changes from blue to grey. The nitrogen content of xanthan gum can be calculated from the amount of sulphuric acid solution used.
• Residual solvent assay
  Liquid chromatography is used to check the presence of residual solvents (methanol, ethanol, and isopropanol) in xanthan gum. In this method, cyanopropylphenyl-dimethylsiloxane is used as the stationary solution, and tert-butanol solution is used as the internal standard solution. The amount of residual solvent is calculated as peak area according to the internal standard method. It is worth noting that the amount of isopropanol contained in xanthan gum should not exceed 0.075%.
• Loss on drying
  We dry xanthan gum at 105°C. The weight loss of xanthan gum must not exceed 15.0% when it is constant weight.
• Ash
  Xanthan gum is slowly incinerated until completely charred and then completely ashed in an elevated temperature environment. The amount of ash in xanthan gum should not exceed 16.0% of the dried xanthan gum.
• Microbial limit
  We utilize the microbial enumeration method to quantify and qualitatively analyze the microorganisms in xanthan gum. It is important to note that the total number of aerobic bacteria contained per 1 g of xanthan gum should not exceed 10³ cfu and the total number of moulds and yeasts should not exceed 10² cfu.

Frequently Asked Questions

• What are the positive properties of xanthan gum?
  Suspension and emulsification: Xanthan gums have a reticulated structure and show strong stabilizing emulsification and high suspending ability.
  Excellent water solubility: Xanthan gum has excellent water solubility that dissolves quickly in water. Particularly it can dissolve in cold water, thus eliminating the need for complicated processing and making it easy to use.
  Thickening: Xanthan gum solution is a highly effective thickener due to its low concentration and high viscosity properties.
  Stability to heat: The viscosity of xanthan gum solutions never changes significantly with temperature, and even low concentrations of aqueous solutions still display consistently high viscosities over a wide range of temperatures.
  Stability to acid and alkali: Xanthan gum solution has very high stability to acids and alkalis and is unaffected by its viscosity at a pH of 5-10.
  Stability to salts: The xanthan gum solution is compatible with many salt solutions (potassium, sodium, calcium, magnesium, etc.) and its viscosity is not affected.
  Stability to enzyme reaction: Due to the characteristics of the stable double helix structure, xanthan gum is extremely resistant to oxidation and enzymatic degradation. A lot of enzymes (such as protease, amylase, cellulase, and hemicellulase enzymes) fail to degrade xanthan gum.

• What are the structural characteristics of xanthan gum?
  Xanthan gum is a high molecular polysaccharide substance made of 5 molecules of sugar as a unit and polymerized from the same units. Each unit consists of 2 molecules of glucose, 2 molecules of mannose, and 1 molecule of glucuronic acid. The main chain of β-glucose through the 1,4-glycosidic bond is connected to 2 molecules of glucose as a unit, and its structure is the same as the structure of cellulose. Because its side chain contains acidic groups, it is a polyanion in an aqueous solution and shows a tertiary three-dimensional structure.

Advantages

• We have a professional pharmaceutical excipient analysis team to provide one-to-one custom xanthan gum analysis solutions.
• We have mastered advanced Pharmaceutical and Biological Analysis techniques to efficiently and with high quality help our clients solve the problems encountered in xanthan gum research.
• We have a dedicated team of professionals who can accurately interpret and analyze xanthan gum results to help our clients better understand the nature and characteristics of their samples.

CD BioGlyco provides reliable xanthan gum analysis services according to clients' needs. If you have any questions about pharmaceutical excipient analysis please feel free to contact us and our staff will be happy to answer them.