Next time you handle medicine or enjoy a luxuriously textured lotion, consider the unsung heroes at play - suspending agents. These agents, like xanthan gum and tragacanth, ensure the stability and consistency of liquid formulations, significantly contributing to the quality and effectiveness of our daily products.
The science behind suspending agents lies in their remarkable ability to increase liquid viscosity, forming a gel-like structure that uniformly supports solid particle distribution. This mechanism prevents sedimentation, ensuring the sustained homogeneity and intended properties of the product over time.
Did you know?
The effectiveness of suspending agents is often visible under a microscope. The even dispersion of
particles contributes to the macroscopic qualities of the product, ensuring a smooth and consistent user
experience.
Pharmgenity Health supplies and exports Suspending and Viscosity-Increasing Agents including HPMC E5, E15, E50, K4M and K100M, acting as a manufacturer, supplier, distributor and exporter of suspending and viscosity-increasing agents from Mumbai, India.
| SN | Product Name | Description |
|---|---|---|
| 1 | HPMC E5 | Low viscosity HPMC grade for immediate-release and suspension formulations |
| 2 | HPMC E15 | Low to medium viscosity HPMC for oral liquid suspensions |
| 3 | HPMC E50 | Medium viscosity HPMC for enhanced suspension stability |
| 4 | HPMC K4M | High viscosity HPMC for controlled-release matrix tablets |
| 5 | HPMC K100M | Ultra-high viscosity HPMC for extended sustained-release formulations |
Other products are available based on customer requirements.
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If the listed products don't precisely fit your requirements, we're ready to customize our offerings to meet your specific needs. Contact with us for a personalized quote.
Hydroxypropyl Methylcellulose (HPMC) acts as a suspending agent by dissolving in water to form a viscous colloidal solution. This increased viscosity slows the sedimentation rate of suspended particles according to Stokes' law, keeping insoluble drug particles uniformly dispersed. HPMC also provides a structured network that physically entraps particles, preventing rapid settling and caking at the bottom, ensuring dose uniformity throughout the product shelf life.
HPMC E-series has a methoxyl content of 28-30% and a hydroxypropyl content of 7-12%, making it suitable for immediate-release and capsule applications. K-series has a lower methoxyl content (19-24%) and higher hydroxypropyl content (7-12%), providing thermal gelation properties ideal for controlled-release matrix systems. E-series dissolves at lower temperatures and produces clearer solutions, while K-series forms stronger gels at higher temperatures.
HPMC solution viscosity is influenced by polymer concentration, molecular weight grade, temperature, and shear rate. Higher concentrations and higher molecular weight grades (K100M greater than K4M) produce greater viscosity. HPMC solutions exhibit pseudoplastic (shear-thinning) behavior, meaning viscosity decreases under shear and recovers when shear is removed. Temperature inversely affects viscosity - solutions thin when heated and thicken upon cooling, a reversible property useful for manufacturing.
In controlled-release matrices, HPMC hydrates on contact with aqueous fluids to form a gelatinous barrier layer around the tablet. Drug release is controlled by diffusion through this gel layer and by erosion of the polymer matrix. K-series grades, particularly K4M and K100M, are preferred for sustained release due to their rapid hydration and robust gel formation, providing near-zero-order release kinetics for up to 24 hours.
For oral suspensions, HPMC is typically used at 0.25-2% w/v depending on the desired viscosity and the density of the suspended particles. Low-viscosity grades (E5, E15) at 0.5-1% provide sufficient suspension for light particles, while higher concentrations or higher viscosity grades (E50) may be needed for dense or high drug-load suspensions. The viscosity should be high enough to prevent settling but low enough for easy pouring.
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