Gel Permeation Chromatography (GPC)
Gel Permeation Chromatography (GPC) is based on the principle of size exclusion, in which components flowing in solution through a chromatographic column are separated based on molecular size. It determines molecular weights and the distribution of natural and synthetic polymers. This test is offered by Infinita Lab, USA, through its vast laboratory network.
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- Overview
- Scope, Applications, and Benefits
- Test Process
- Specifications
- Instrumentation
- Results and Deliverables
Gel Permeation Chromatography - Overview
Gel Permeation Chromatography (GPC), also known as Size Exclusion Chromatography (SEC), is a technique used to characterise the molecular weight distribution of polymers. Polymer chains in solution are separated by size as they pass through a porous column packing; larger molecules elute first, while smaller molecules are retained longer. Detector response is used to generate the full molecular weight distribution, including number-average (Mn), weight-average (Mw), and z-average (Mz) molecular weights and dispersity (Đ).
GPC is an essential tool for polymer characterisation, quality control, and formulation development, providing molecular weight data that directly correlates with mechanical, rheological, and processing properties.
Scope, Applications, and Benefits
Scope
Gel Permeation Chromatography (GPC) provides a comprehensive understanding of a polymer’s molecular weight characteristics and distribution. It helps assess both the average values and the spread of molecular weights within a sample, which are critical for predicting material performance.
GPC evaluates:
- Number-average molecular weight (Mn)
- Weight-average molecular weight (Mw)
- Dispersity index (Đ = Mw/Mn), indicating uniformity
- Complete molecular weight distribution curve
- High molecular weight (HMW) fractions
- Low molecular weight (LMW) tail fractions
Applications
- Polymer resin and batch-to-batch quality control
- Polymer degradation and ageing studies
- Pharmaceutical excipient and biopolymer characterisation
- Adhesive, coating, and resin formulation development
- Regulatory submission data for polymer-containing products
Benefits
- Full molecular weight distribution in a single run
- Correlates MW data with mechanical and processing properties
- Detects batch-to-batch molecular weight variations
- Supports polymer formulation and blend optimisation
- Enables regulatory compliance (FDA, ICH guidelines)
Gel Permeation Chromatography - Test Process
Sample Dissolution
Dissolve polymer in suitable solvent (1–5 mg/mL) with mild heating if needed.
1Column Calibration
Calibrate columns using polymer standards to build calibration curve.
2Injection & Separation
Inject sample; separate components by hydrodynamic volume.
3Detection & Processing
Detect via RI/UV; compute Mn, Mw, Mz, and Đ.
4Gel Permeation Chromatography - Technical Specifications
| Parameter | Details |
|---|---|
| Solvents | THF, DMF, chloroform, water, NMP (application dependent) |
| Molecular Weight Range | 200 Da to >10,000,000 Da |
| Detectors | RI (refractive index), UV, MALS, viscometer |
| Calibration Standards | PS, PMMA, PEG, pullulan (aqueous) |
| Column Temperature | Ambient to 160 °C (for polyolefins) |
Instrumentation Used for Testing
- GPC/SEC system with pump, injector, and column oven
- Refractive index (RI) and UV detectors
- Multi-angle light scattering (MALS) detector (absolute MW)
- Narrow-distribution calibration standards
- GPC data processing software (Omnisec, Empower, EcoSEC)
Results and Deliverables
- Full molecular weight distribution chromatogram
- Mn, Mw, Mz, and Đ values with standard uncertainty
- High/low MW fraction analysis
- Batch-to-batch comparison overlays
- Calibration curve and system suitability data
- Full GPC test report per ASTM D5296
Partnering with Infinita Lab for Optimal Results
Infinita Lab addresses the most frustrating pain points in the Gel Permeation Chromatography testing process: complexity, coordination, and confidentiality. Our platform is built for secure, simplified support, allowing engineering and R&D teams to focus on what matters most: innovation. From kickoff to final report, we orchestrate every detail—fast, seamlessly, and behind the scenes.
Looking for a trusted partner to achieve your research goals? Schedule a meeting with us, send us a request, or call us at (888) 878-3090 to learn more about our services and how we can support you. Request a Quote
Frequently Asked Questions
Conventional GPC calibration uses polymer standards of known MW to estimate MW of unknown samples — accurate only when the unknown polymer has a similar hydrodynamic volume–MW relationship as the standards. MALS detection measures absolute MW independent of standards, required for branched polymers, proteins, and materials where universal calibration does not apply.
Higher molecular weight generally improves tensile strength, impact resistance, and melt toughness, while lower MW polymers process more easily at lower viscosities. Dispersity (Đ) influences melt flow behaviour and the breadth of the glass transition.
THF is standard for polystyrene, acrylics, and many engineering polymers. DMF or NMP is used for polyamides and polyimides. Chloroform or DCM for polycarbonate and polyesters. Water or buffer is used for PEG, polysaccharides, and proteins.
Yes. A shift to lower molecular weight, broadening of the MWD, or appearance of new low-MW peaks in a GPC chromatogram are indicators of chain scission degradation from thermal, UV, or hydrolytic exposure.
Typically 10–50 mg of polymer is sufficient for standard GPC analysis, yielding a 1–5 mg/mL solution. For low-solubility polymers or those requiring high-temperature GPC (e.g., polyolefins at 160 °C), slightly larger quantities may be needed.
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