Bound Water Molecules: Bulk Density 0.5-0.7 g/mL

Component Specifications

Definition

Bound water molecules refer to water molecules that are chemically incorporated into the crystalline lattice of lactose monohydrate through hydrogen bonding and coordination interactions. Unlike free moisture, these water molecules are integral to the crystal structure and cannot be removed without disrupting the crystalline form. In pharmaceutical-grade lactose monohydrate, this bound water constitutes exactly one mole of water per mole of lactose (approximately 5% by weight), providing specific physicochemical properties crucial for tablet formulation, powder flow, and drug stability.

Working Principle

Bound water molecules function through hydrogen bonding with hydroxyl groups on lactose molecules, creating a stable crystalline hydrate structure. This water maintains the α-lactose monohydrate form, influencing powder compaction behavior, dissolution rates, and moisture sorption characteristics. The water molecules act as plasticizers during tablet compression and contribute to the formation of solid bridges during drying processes.

Materials

Pharmaceutical-grade lactose monohydrate (C12H22O11·H2O) with bound water content of 4.5-5.5% w/w, meeting USP/EP specifications for residual moisture and crystalline structure.

Technical Parameters

Parameter	Typical range	Notes & selection driver
Bulk Density	0.5-0.7 g/mL
Crystal Form	α-lactose monohydrate
Water Content	4.5-5.5% w/w (Karl Fischer)
Loss On Drying	<0.5%
Specific Surface Area	0.3-0.8 m²/g
Particle Size Distribution	D50: 50-150 μm

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, USP <31>, EP 2.9.6, ICH Q3C

Parent Products

This component is used in the following industrial products

Pharmaceutical-Grade Lactose Monohydrate

High-purity lactose excipient for pharmaceutical tablet and capsule formulations

View Product Details

Engineering Analysis

Risks & Mitigation

Crystalline transformation to anhydrous form if overheated
Moisture migration in blended formulations
Variable compaction behavior if bound water content fluctuates

FMEA Triads

Trigger: Over-drying during processing above 100°C
Failure: Conversion to anhydrous lactose, altered compaction properties
Mitigation: Control drying temperature below 80°C, monitor moisture content with NIR spectroscopy

Trigger: Improper storage conditions (high humidity)
Failure: Additional moisture adsorption, caking, reduced flowability
Mitigation: Store at 25°C/60% RH maximum, use moisture-barrier packaging

Trigger: Inconsistent raw material sourcing
Failure: Variable bound water content, batch-to-batch inconsistency
Mitigation: Implement supplier qualification program, conduct DSC analysis for crystalline form verification

Industrial Ecosystem

Compatible With

Typical Suppliers & Equivalents

Compliance & Inspection

Tolerance

±0.3% water content variation from target 5.0%

Test Method

Karl Fischer titration (coulometric), Differential Scanning Calorimetry (DSC) for crystalline form verification, X-ray Powder Diffraction (XRPD)

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 Bound Water Molecules

Manufacturer profiles associated with Bound Water Molecules.

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Frequently Asked Questions

Why are bound water molecules important in pharmaceutical lactose?

Bound water molecules maintain the α-lactose monohydrate crystalline structure, which provides consistent compaction properties, predictable dissolution behavior, and protection against moisture-induced degradation of active pharmaceutical ingredients.

Can bound water be removed from lactose monohydrate?

Bound water cannot be removed without converting lactose to anhydrous form, which alters its pharmaceutical properties. Complete dehydration requires heating above 130°C and changes the material's compaction and dissolution characteristics.

How does bound water affect tablet manufacturing?

Bound water acts as an internal lubricant during compression, improves powder flowability, and contributes to tablet hardness through solid bridge formation during drying cycles in fluid bed processors or tray dryers.

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.

Bound Water Molecules