Refined Carrageenan in Food

In cosmetic formulation, hydrocolloids are nothing new. Xanthan gum thickens, carrageenan suspends, gellan gum gels, and pullulan forms films — each has its own specialty. But what truly challenges formulators is not "which one to use," but "how to combine them for stability."

Single hydrocolloids always have limitations: xanthan gum alone provides insufficient oil dispersion and tends to release oil; agarose alone lacks suspension power and tends to separate; gellan gum forms brittle gels; pullulan solutions have low viscosity and struggle to form gels. But when combined, they can produce synergistic effects where the whole is greater than the sum of its parts.

Xanthan Gum + Agarose: The Balance Between Suspension and Dispersion

This is a classic combination validated by patent research. Researchers found that when the mass ratio of agarose to xanthan gum is 1:2 with a total usage of 0.6%, the blended thickening system delivers optimal performance.

The reason lies in the division of labor: xanthan gum excels at dispersing oils but lacks suspension power; agarose excels at suspension but lacks dispersion capability. The 1:2 ratio achieves the optimal balance between oil dispersion and suspension, with samples remaining stable after centrifugation testing. Reproducibility has been confirmed through multiple preparations.

More importantly, this ratio achieves the best balance of stability, cost, and sensory feel at a low usage level of 0.2% agarose + 0.4% xanthan gum. Accelerated aging tests showed no abnormalities in appearance, pH, or viscosity after three months of storage at 48°C.

Pullulan: The Invisible Assistant for Film-Forming and Moisturizing

Pullulan plays a unique role in cosmetics. Its films have extremely low air permeability — oxygen, nitrogen, and carbon dioxide can barely pass through — while moisture vapor transmission remains relatively high. This means it forms an invisible film on the skin that moisturizes without suffocating.

In a moisturizing and soothing cleanser patent, pullulan worked synergistically with glycerin to effectively reduce transepidermal water loss caused by cleansing, enhancing moisturizing effects. Pullulan also has notable adhesive properties, readily attaching to the skin surface. It dissolves quickly in cold water, remains stable long-term, and is not easily affected by pH or salts.

In emulsion systems, pullulan content is typically controlled at 0.01%–1 wt%, preferably 0.05%–0.2 wt%. It is often used in combination with carrageenan to help stabilize emulsion systems.

Gellan Gum + Xanthan Gum: Flexibility in Gel Control

When used as a thickening and gelling agent in cosmetics, gellan gum is typically used at concentrations of only 0.05%–0.1 wt%. Its key feature is that it gels at low concentrations, and the gel is thermally reversible. By controlling the type and concentration of cations, the gel can remain in a gelled state even at elevated temperatures.

The mixture of gellan gum and xanthan gum is explicitly preferred as a hydrophilic gelling agent combination in patents. Gellan gum provides the gel framework while xanthan gum provides suspension and thickening. Together, they can flexibly adjust the rheological properties of a product within a 0.01%–1 wt% range. This combination is particularly suitable for formulations that need "texture without heaviness," such as serums and lotions.

Carrageenan: A Multi-Tasker from Thickening to Bioactivity

Carrageenan's role in cosmetics extends far beyond thickening and stabilization. A 2022 review noted that carrageenan possesses multiple bioactivities including antioxidant, anti-aging, anti-photoaging, and anti-melanogenic effects. It can replace synthetic thickeners such as PEG and carbomer, without causing irritation on damaged skin the way PEG can.

In practical formulations, carrageenan is often blended with pullulan, xanthan gum, and others. One aqueous gel formulation used a combination of 0.2% konjac glucomannan + 0.2% xanthan gum + 0.2% pullulan + 10% carrageenan for preparing natural cosmetic hydrogels. Carrageenan forms the gel network during cooling, while the other polysaccharides modulate rheology and moisturizing properties.

The Core Logic of Blending

The synergistic effects of these hydrocolloids are essentially about balancing rheology:

Contact us for a free sample and technical consultation — and make your cosmetic formulations more stable and more efficient.