Polysciences was the first to develop a vacuum-distilled grade of glutaraldehyde specifically for immunochemical techniques. This EM Grade, 70% aqueous solution is manufactured and batch analyzed to support consistent quality and minimize polymeric and other impurities that may interfere with antigenicity or fixation performance.
Glutaraldehyde is an amine-reactive dialdehyde used to crosslink proteins and stabilize biological specimens. It is commonly used in electron microscopy, histochemical, immunological, and related laboratory workflows where controlled fixation conditions and reagent quality are important.
Each ampoule is supplied with an ampoule cracker for controlled opening. Fixation outcome depends on concentration, buffer composition, pH, temperature, specimen dimensions, and exposure time.
Key Properties
- EM Grade, 70% aqueous glutaraldehyde solution
- Vacuum distilled for use in demanding fixation workflows
- Developed by Polysciences for immunochemical techniques
- Batch analyzed to support consistent quality
- Manufactured to minimize undesirable polymeric impurities
- Amine-reactive dialdehyde used for protein crosslinking
- Ampoule format includes an ampoule cracker
Applications
Electron Microscopy Fixation
Glutaraldehyde is commonly used as a primary fixative in electron microscopy sample preparation. Protein crosslinking helps stabilize cellular and tissue ultrastructure during subsequent processing and imaging.
Histochemical & Immunological Techniques
EM Grade glutaraldehyde is recommended for histochemical and immunological workflows where controlled fixation and a low level of polymeric impurities are important. Fixation conditions should be validated because extensive crosslinking can alter antigen accessibility.
Protein Crosslinking & Immobilization
As an amine-reactive dialdehyde, glutaraldehyde may be used in research workflows involving protein crosslinking, enzyme immobilization, and stabilization of protein-containing preparations.
Amine-Functional Surface Coupling
Glutaraldehyde may be evaluated in coupling protocols involving amine-functional beads, microplates, or other solid supports and amine-containing ligands. Surface chemistry, reagent concentration, blocking steps, and reaction conditions require application-specific optimization.
Fixation & Crosslinking Considerations
- Concentration and exposure time should be optimized for the specimen and analytical method
- Buffer composition and pH can influence fixation and crosslinking behavior
- Extensive crosslinking may reduce antigen accessibility in some immunolabeling workflows
- Specimen dimensions and diffusion time are important fixation variables
- Coupling performance depends on the functional groups present on the ligand and solid support
Final fixation or coupling performance depends on the specimen, substrate, protocol conditions, and downstream staining, imaging, or binding method.
Preparation Tips
- Prepare working dilutions according to a validated protocol
- Select the buffer and pH based on the specimen and downstream method
- Use clean, chemically compatible vessels and calibrated volumetric equipment
- Validate changes in concentration, fixation time, or coupling conditions using representative samples
- Open ampoules using the supplied ampoule cracker and appropriate protective equipment
Handling & Storage
- Store refrigerated according to the product-specific documentation
- Keep unopened ampoules properly sealed until use
- Handle in a chemical fume hood with appropriate gloves and eye protection
- Avoid inhalation, skin contact, and eye contact
- Consult the Safety Data Sheet before handling or disposal
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FAQ
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1. What distinguishes Polysciences EM Grade glutaraldehyde?
Polysciences was the first to develop a vacuum-distilled grade of glutaraldehyde specifically for immunochemical techniques. The product is batch analyzed to support consistent quality and minimize undesirable polymeric and other impurities that may interfere with antigenicity or fixation performance.
2. What is EM Grade glutaraldehyde used for?
EM Grade glutaraldehyde is used in electron microscopy fixation, histochemical and immunological techniques, protein crosslinking, and selected biomolecule immobilization workflows.
3. What types of macromolecules does glutaraldehyde affect?
Glutaraldehyde primarily crosslinks proteins by reacting with accessible amino groups, including lysine-associated amines. This reaction stabilizes biological structures but may also alter protein conformation or antigen accessibility.
4. Can glutaraldehyde be used for amine-functional microplate coupling?
Glutaraldehyde may be used as an amine-reactive crosslinker in protocols for immobilizing proteins or other amine-containing ligands on suitably functionalized microplates, beads, and solid supports. Performance depends on the surface chemistry and protocol conditions, so application-specific validation is required.
5. Why select EM Grade rather than a general reagent grade?
EM Grade material is selected when batch-controlled quality and a low level of polymeric impurities are important for microscopy, histochemical, or immunological workflows. The appropriate grade and working conditions should be selected according to the analytical method and product documentation.
6. How should the product be stored and handled?
Store the product refrigerated as directed by the product-specific documentation and keep ampoules sealed until use. Handle the solution in a chemical fume hood using appropriate gloves and eye protection, and consult the SDS before use.
Safety & Documentation
Handle glutaraldehyde solutions with appropriate laboratory controls, including adequate ventilation, chemical-resistant gloves, and eye protection. Refer to the product Safety Data Sheet, specification sheet, and applicable laboratory procedures for complete handling, storage, dilution, and disposal guidance.
