Sorbitol EC Granules are coated pharmaceutical excipient granules containing d-sorbitol as the core material and a defined enteric coating system designed for applications requiring protection of the granule core under acidic conditions and release characteristics in a higher-pH environment. Sorbitol, also known as d-glucitol, has the molecular formula C₆H₁₄O₆, molecular weight 182.17, and CAS Number 50-70-4. Current USP-NF defines Sorbitol as containing not less than 91.0% and not more than 100.5% d-sorbitol, calculated on the anhydrous basis.
The designation EC, or Enteric-Coated, refers to the finished granule system rather than to sorbitol itself. Sorbitol is a highly water-soluble polyhydric alcohol and is not inherently an enteric coating material. FCC describes sorbitol as available in granular form, very soluble in water, slightly soluble in ethanol, and hygroscopic.
For this reason, the enteric characteristics of Sorbitol EC Granules depend on the coating polymer, coating composition, coating weight, coating uniformity, film integrity, processing conditions, and validated acid-resistance and dissolution performance.
Sorbitol EC Granules are granulated sorbitol-based pharmaceutical excipient materials provided with an enteric coating. The sorbitol core provides the underlying excipient characteristics, while the coating is responsible for modifying the interaction between the granules and the surrounding gastrointestinal environment.
A properly designed enteric coating is intended to provide resistance to acidic conditions and permit release after exposure to a higher-pH environment. The actual performance depends on the selected coating system and its validated specifications.
Sorbitol itself should therefore not be described as an enteric excipient. The term Sorbitol EC Granules describes the finished coated-granule format.
Sorbitol is a polyhydric alcohol used in pharmaceutical formulation applications. Current USP-NF identifies it as d-glucitol and gives the formula C₆H₁₄O₆, molecular weight 182.17, and CAS Number 50-70-4. The current monograph specifies 91.0–100.5% d-sorbitol calculated on the anhydrous basis.
Sorbitol is highly soluble in water. FCC describes sorbitol as occurring as a white powder, granules, or crystalline masses and as very soluble in water. It is also described as hygroscopic.
These properties are relevant when developing coated sorbitol granules because the coating can be used to modify the interaction between the highly water-soluble core and the formulation environment.
The enteric performance of Sorbitol EC Granules is determined by the complete coated-granule system.
Important coating characteristics can include:
These characteristics are product-specific. A generic coating percentage or dissolution value should not be assigned without validated product data.
Acid resistance is an important quality attribute for an enteric-coated granule system. The coating should provide the required protection during the specified acidic exposure period when the product is designed for enteric performance.
The required acid-resistance conditions depend on the intended formulation and applicable testing procedure. Therefore, a universal acid-resistance duration should not be stated unless it is supported by the approved specification and validated test method.
After the intended acidic stage, an enteric coating is generally designed to become more permeable or dissolve under higher-pH conditions, allowing the core material to become available.
For Sorbitol EC Granules, the release profile depends on:
Therefore, specific claims such as rapid release at a particular time point should only be made when supported by finished-product dissolution data.
Particle size is important for coated granules because it can affect coating uniformity, surface area, flowability, packing, and downstream processing.
Important physical characteristics may include:
A controlled particle-size range can support more consistent coating and handling.
The actual D10, D50, D90 and granule-size limits should be taken from the approved product specification.
Coating weight gain is one of the important parameters in an enteric-coated granule system. Insufficient or nonuniform coating can affect acid resistance and release performance, while excessive coating can affect processing, dissolution, and the final product characteristics.
Coating uniformity may be evaluated through suitable analytical and physical methods according to the product specification.
A universal coating weight-gain percentage should not be published because the required value depends on the coating polymer, formulation, granule size, target performance, and manufacturing process.
Sorbitol is hygroscopic, making moisture management important for Sorbitol EC Granules. Moisture can influence the core material, coating properties, granule strength, flowability, and storage stability.
The coating may provide some barrier characteristics, but the finished product should still be evaluated under appropriate packaging and storage conditions.
Important considerations include:
The appropriate moisture limit should be based on actual product development and stability data.
Sorbitol EC Granules can be evaluated for pharmaceutical formulations requiring a coated, water-soluble excipient core with an enteric surface.
During development, formulators may evaluate:
The final formulation should be developed according to its intended performance requirements.
The coated granule format can provide a controlled physical form for handling, blending, filling, and formulation development.
Processing characteristics can be influenced by:
These factors should be assessed during process development to ensure consistent manufacturing performance.
Quality control of Sorbitol EC Granules should address both the sorbitol core and the finished coated-granule characteristics.
Current USP-NF provides the identity and d-sorbitol content requirement for Sorbitol, while additional finished-product specifications are required for the coated granule system.
Depending on the approved specification, quality testing may include:
Compendial specifications should be distinguished from additional functional specifications established specifically for the finished EC granules.
Sorbitol EC Granules can be developed for:
The actual application depends on the coating system, formulation design, and validated performance.
Sorbitol EC Granules are specialized coated pharmaceutical excipient granules containing d-sorbitol as the core material and a defined enteric coating system.
Current USP-NF identifies Sorbitol as d-glucitol with CAS Number 50-70-4, molecular formula C₆H₁₄O₆, molecular weight 182.17, and a d-sorbitol content requirement of 91.0–100.5% on the anhydrous basis.
FCC describes sorbitol as occurring in granular form and as very soluble in water, with hygroscopic characteristics.
For Sorbitol EC Granules, however, the enteric performance comes from the finished coating system rather than from sorbitol itself. Therefore, coating composition, coating weight gain, coating uniformity, acid resistance, and dissolution performance should be controlled according to the actual finished-product specification.
Sorbitol EC Granules can provide a specialized coated excipient format for pharmaceutical manufacturers and formulation developers requiring a water-soluble sorbitol core with validated enteric coating performance.
| Parameter | Specification |
|---|---|
| Appearance | White to off-white granules |