Counterion: pH Range 5.0-8.0 in 1% solution, Purity ≥99.9%

Component Specifications

Definition

In pharmaceutical-grade API manufacturing, a counterion is an oppositely charged ion that pairs with an ionizable active pharmaceutical ingredient to form a stable salt or complex. This component is critical for controlling solubility, stability, bioavailability, and crystallization properties of APIs. Counterions are selected based on their ability to enhance pharmaceutical performance while maintaining safety and regulatory compliance.

Working Principle

Counterions work through ionic bonding principles, where positively charged cations pair with negatively charged API anions (or vice versa) to form neutral salts. This interaction modifies the API's physical-chemical properties, including melting point, hygroscopicity, and dissolution rate. The selection follows the hard-soft acid-base theory and considers ionic radius, charge density, and hydration energy to achieve optimal pharmaceutical characteristics.

Materials

Pharmaceutical-grade inorganic or organic ions including sodium, potassium, calcium, magnesium, chloride, sulfate, phosphate, citrate, tartrate, mesylate, besylate, or custom organic anions. Materials must meet USP/EP/JP pharmacopeia standards for purity (<0.1% impurities) and be free from heavy metals, residual solvents, and microbial contamination.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Purity	≥99.9%
PH Range	5.0-8.0 in 1% solution
Heavy Metals	<10 ppm
Particle Size	10-100 μm
Microbial Limits	<100 CFU/g
Moisture Content	<0.5%
Residual Solvents	Class 1: <10 ppm, Class 2: <100 ppm

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, USP <467>, ICH Q3D, EP 2.4.16

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

Ionic imbalance affecting API stability
Counterion degradation during processing
Regulatory non-compliance due to impurity profiles
Batch-to-batch variability in complex formation

FMEA Triads

Trigger: Incorrect stoichiometric ratio during salt formation
Failure: Incomplete complexation leading to API degradation
Mitigation: Implement real-time pH monitoring and automated dosing controls with ±0.5% accuracy

Trigger: Counterion hygroscopicity exceeding specifications
Failure: Moisture absorption affecting powder flow and tablet compression
Mitigation: Use desiccant packaging and controlled humidity environments (<30% RH) during storage

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.1% for ionic concentration, ±5% for particle size distribution

Test Method

HPLC for purity, ICP-MS for elemental analysis, Karl Fischer for moisture, USP <701> for dissolution

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

Check the legal entity, factory address, ownership, certifications, and direct contacts.

CNFX does not score or rank suppliers. Buyers must verify all claims and documents with the legal manufacturer before ordering.

Manufacturers of Counterion

Manufacturer profiles associated with Counterion.

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Frequently Asked Questions

What factors determine counterion selection in API manufacturing?

Selection is based on API pKa, desired solubility profile, stability requirements, bioavailability targets, regulatory acceptance, and manufacturing process compatibility. Common considerations include ionic strength, hygroscopicity, and crystallization behavior.

How do counterions affect drug bioavailability?

Counterions modify dissolution rates, permeability, and metabolic pathways. Optimal pairing can enhance oral absorption by 20-50% through improved solubility and membrane transport properties while maintaining therapeutic efficacy.

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.

Counterion