Imagine your favourite syrup maintaining its consistency without settling, or your shampoo having the perfect viscosity for an indulgent lather. Suspending agents ensure uniform distribution of particles, preventing settling over time. On the other hand, thickening agents provide the desired texture, turning a runny liquid into a luxurious gel or cream.
Did you know ?
The use of natural substances like gums and starch for thickening dates back centuries, reflecting the timeless need for desirable textures in various applications.
Acrysol K-140
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Common questions about Acrysol K-140 suspending and thickening agents for oral liquid pharmaceutical formulations.
Acrysol K-140 is a synthetic polymeric suspending agent that increases the viscosity of liquid formulations, reducing the sedimentation rate of insoluble particles according to Stokes' law. Its long-chain polymer structure creates a three-dimensional network that physically entraps suspended particles, preventing settling and caking. The polymer also imparts pseudoplastic (shear-thinning) rheology, allowing the product to flow easily when shaken but regain viscosity on standing.
Acrysol K-140 is typically used at 0.1-1% w/w in oral liquid formulations. For most oral suspensions, 0.2-0.5% provides adequate viscosity to suspend common drug particles without making the product too thick to pour. Concentrations above 1% may produce excessively thick formulations that are difficult to handle during manufacturing and inconvenient for patients to measure and administer.
Acrysol K-140 offers several advantages over natural gums like xanthan gum and tragacanth: it provides more consistent viscosity batch-to-batch, has better resistance to microbial degradation, and maintains stable viscosity across a wider pH range. It is also compatible with a broader range of electrolytes and active ingredients. However, natural gums may be preferred in formulations requiring natural labeling or when synergistic thickening with other natural polymers is desired.
Acrysol K-140 thickens through polymer chain entanglement and hydrogen bonding with water molecules. When dissolved, the long acrylic polymer chains unfold and interact with surrounding water molecules through hydrogen bonds, creating a hydrated network that resists flow. The degree of thickening depends on polymer concentration, molecular weight, and pH. In alkaline conditions, the polymer chains further expand due to electrostatic repulsion, producing higher viscosity.
Yes, Acrysol K-140 is suitable for oral pharmaceutical preparations when used at approved concentrations. It is non-toxic, non-irritant, and compatible with commonly used preservatives, sweeteners, and flavoring agents. The polymer is not absorbed from the gastrointestinal tract and is excreted unchanged. Formulators should verify regulatory compliance for the specific grade and concentration in their target market before commercial use.
Acrysol K-140