Solvate/Hydrate: Flowability Carr Index: 15-25%

Component Specifications

Definition

A solvate/hydrate is a solid-state form of an Active Pharmaceutical Ingredient where solvent molecules (commonly water for hydrates, or organic solvents like ethanol or methanol for solvates) are stoichiometrically or non-stoichiometrically bound within the crystal lattice. This component is critical in pharmaceutical-grade API production as it affects solubility, stability, bioavailability, and processing characteristics. The formation occurs during crystallization processes where API molecules co-crystallize with solvent molecules, creating distinct crystalline phases with unique physicochemical properties.

Working Principle

The working principle involves controlled crystallization where API molecules form crystalline structures that incorporate solvent molecules into their lattice through hydrogen bonding, van der Waals forces, or coordination bonds. During pharmaceutical manufacturing, specific temperature, pressure, and solvent conditions are maintained to produce the desired solvate/hydrate form with consistent polymorphic characteristics. The component's functionality depends on maintaining the crystalline integrity during processing, storage, and formulation.

Materials

Pharmaceutical-grade crystalline solids composed of API molecules (typically organic compounds with molecular weights 200-1000 Da) and incorporated solvent molecules (water for hydrates: H₂O; organic solvents like ethanol C₂H₅OH, methanol CH₃OH, acetone C₃H₆O, or dichloromethane CH₂Cl₂ for solvates). Purity requirements: ≥99.5% chemical purity, ≤0.1% residual solvents (per ICH Q3C), particle size distribution: D90 < 200μm.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Flowability	Carr Index: 15-25%
Bulk Density	0.3-0.6 g/cm³
Melting Point	150-300°C (decomposition may occur)
Crystal System	Monoclinic, Triclinic, or Orthorhombic
Hygroscopicity	Low to Moderate (for hydrates)
Compressibility	2-10%
Solvent Content	0.5-20% w/w
Specific Surface Area	0.5-5 m²/g
Particle Size Distribution	D10: 10-50μm, D50: 50-150μm, D90: 150-250μm

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Standards

ISO 9001, ISO 13485, ICH Q6A, ICH Q3C, USP <1151>, EP 5.9, GMP Guidelines

Parent Products

This component is used in the following industrial products

Pharmaceutical-Grade Active Pharmaceutical Ingredient (API)

Pure chemical substance responsible for therapeutic effect in pharmaceutical formulations

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Engineering Analysis

Risks & Mitigation

Polymorphic transformation during processing
Solvent loss leading to form change
Hygroscopicity causing stability issues
Batch-to-batch variability in crystal form
Residual solvent contamination
Reduced bioavailability if incorrect form

FMEA Triads

Trigger: Inadequate humidity control during storage
Failure: Hydrate dehydration to anhydrous form
Mitigation: Implement controlled humidity storage (30-60% RH), use desiccant-containing packaging, monitor with humidity sensors

Trigger: Improper crystallization conditions
Failure: Formation of undesired polymorphic forms
Mitigation: Precise temperature control (±0.5°C), controlled cooling rates, in-process monitoring with PAT tools

Trigger: Solvent contamination from previous batches
Failure: Cross-contamination leading to mixed solvate forms
Mitigation: Implement dedicated equipment, rigorous cleaning validation, solvent purity verification

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

Crystal form purity ≥98%, Solvent content ±2% of target, Particle size D90 ±15%, Residual solvents ≤ICH Class 2 limits

Test Method

X-ray diffraction for crystal form identification, Karl Fischer titration for water content, GC for residual solvents, Laser diffraction for particle size, DSC for thermal properties

Procurement Evaluation Criteria

A practical evidence checklist for RFQ preparation and supplier evaluation.

Technical documentation

Request current drawings, revision history, and a signed specification sheet.

Manufacturing capability

Verify equipment lists, process limits, capacity, and representative production evidence.

Inspection readiness

Confirm test methods, calibrated equipment, sampling plans, and traceable reports.

Supplier transparency

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Manufacturers of Solvate/Hydrate

Manufacturer profiles associated with Solvate/Hydrate.

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Frequently Asked Questions

What is the difference between a solvate and a hydrate?

A hydrate specifically contains water molecules in its crystal lattice, while a solvate contains other solvent molecules (ethanol, methanol, acetone, etc.). Hydrates are a subset of solvates where the solvent is water.

Why are solvate/hydrate forms important in pharmaceutical manufacturing?

They significantly impact drug product performance including solubility, dissolution rate, stability, bioavailability, and manufacturability. Different solvate/hydrate forms can have dramatically different therapeutic properties and shelf life.

How are solvate/hydrate forms characterized and controlled?

Through techniques like X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), infrared spectroscopy (IR), and solid-state NMR. Manufacturing controls include strict temperature, humidity, and solvent composition monitoring during crystallization.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Preliminary Technical Classification

This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Solvate/Hydrate