Fixation Buffer for Flow Cytometry - sterile-filtered,BioReagent,1×

Cat. No.: F1508363

GRADE & PURITY Sterile-filtered, BioReagent, 1×

Synonyms

IC Fixation Buffer | Fixation Buffer

Storage

Store at 2-8°C

Shipped In

Wet ice

Application

Flow Cytometry

Specifications

Sinónimos

IC Fixation Buffer | Fixation Buffer

Especificações e pureza

sterile-filtered,BioReagent,1×

Estabilidade e armazenamento

Store at 2-8℃ long term (12 months).

Condições de armazenamento de armazenamento

Store at 2-8°C

Enviado em

Wet ice

Este produto requer transporte de cadeia fria. Serviços terrestres e outros serviços econômicos não estão disponíveis.

Grau

BioReagent, Sterile-filtered

Product Line

Produtos biológicos

Application Protocols

Item-specific, validated protocols: Not specified for this item; refer to CoA/Spec Sheet.

General workflow example for flow cytometry fixation (literature/general; adapt to your assay)

• Sample prep: Harvest cells and wash once in isotonic buffer.
• Optional staining: For surface markers, stain with antibody cocktail per vendor recommendations.
• Fixation: Add the fixation buffer at the recommended ratio (not specified for this item); mix gently and incubate for a defined time at room temperature or 4°C as required.
• Wash: Centrifuge and wash cells 1–2 times with staining buffer to remove residual fixative.
• Downstream steps: Proceed to data acquisition, or for intracellular targets, permeabilize with a compatible reagent and stain accordingly.
• Controls: Include viability dye (if used), FMO controls, isotype/biological controls as appropriate, and a fixed, unstained control to assess autofluorescence.

Notes

• Exact incubation time, temperature, and ratios must be optimized per cell type and fluorophore set. Always verify compatibility of fixative with tandem dyes and fluorescent proteins.
• This product is for research use only.

Biological Roles

Applicability

• This is a formulated laboratory buffer, not a biomolecule with intrinsic physiological roles.

General context (literature/general)

• Mechanistic effect on biology: Aldehyde-based fixatives generate covalent crosslinks (e.g., methylene bridges) primarily between lysine side chains and other nucleophiles, immobilizing proteins and stabilizing cellular architecture. Alcohol-based fixatives precipitate proteins and permeabilize membranes.
• Impact on antigens and fluorophores: Fixation can mask or alter epitopes; antigen retrieval or permeabilization may be needed for intracellular targets. Some fluorescent proteins and tandem dyes exhibit reduced fluorescence after fixation; selection of fixation-compatible reagents is advisable.
• Biosafety: Fixation can inactivate many pathogens, enabling safer handling during flow cytometric analysis; inactivation efficacy depends on fixative chemistry, concentration, temperature, and contact time.

Practical implications

• Time-to-fix is critical: Delays can lead to antigen shedding or internalization. Rapid fixation or staining-then-fixation strategies are commonly used to preserve native distributions.
• Quenching/washing steps reduce residual reactive species that might otherwise crosslink antibodies or interfere with downstream labeling.

Note

• No biological activity or therapeutic function is claimed for this product. It is intended solely for research workflows that require sample preservation prior to cytometric measurement.

Buffer Applications

Item-specific facts (from Product Data)

• Intended use: Fixation Buffer for Flow Cytometry; BioReagent; sterile-filtered; store at 2–8°C.

Practical use in flow cytometry (literature/general)

• Typical workflow
  • Prepare cells at desired concentration (e.g., 0.5–2 × 10^6 cells/mL) in isotonic buffer.
  • Add fixation buffer at the recommended ratio (not specified for this item; refer to CoA/Spec Sheet) and mix gently to avoid clumping.
  • Incubate for a defined period and temperature optimized for your antigens and fluorophores; then wash thoroughly to remove residual fixative.
• Panel design considerations
  • Choose “fix-compatible” viability dyes and fluorophores; test tandem dyes for post-fix stability.
  • For intracellular targets, follow with a validated permeabilization buffer; note that some epitopes require saponin while others tolerate alcohols.
• Controls and QC
  • Include buffer-only blanks to monitor autofluorescence from the buffer system and plasticware.
  • Track lot performance using standard beads or reference cells to ensure consistent MFI and scatter.
• Sample stability
  • Fixation can extend sample stability for delayed acquisition; the extent of stability depends on fixative type and storage conditions. Validate acceptable hold times for your assay.

Parameters not specified for this item

• Composition, pH, osmolality, recommended incubation time/temperature, and use ratios: Not specified; refer to CoA/Spec Sheet.

Green Alternatives

Context

• Fixation buffers often employ formaldehyde/paraformaldehyde, which pose health and environmental hazards. Greener or lower-hazard alternatives may be considered when compatible with assay requirements. The following are literature-based considerations and not product specifications.

Options and trade-offs (literature/general)

• Glyoxal-based fixatives: Reported to provide rapid fixation with reduced toxicity and comparable epitope preservation for many targets. Trade-offs include potential differences in crosslinking density and epitope accessibility; validation is required for multicolor panels.
• Ethanol- or methanol-based fixation: Lower chronic toxicity relative to formaldehyde but can extract membrane lipids and disrupt certain epitopes; generates larger solvent waste streams and is flammable.
• Low-concentration aldehyde with buffering/quencher optimization: Minimizing aldehyde concentration and exposure time, combined with efficient quenching (e.g., amino-buffer components), can reduce residual reactive species while maintaining performance.

Operational greener practices

• Right-sizing volumes to minimize waste; using closed tubes and cold-chain logistics to extend shelf life and reduce discard rates.
• Segregated collection and appropriate neutralization (where institutionally approved) to lower hazardous waste impact.

Recommendation

• When selecting a “greener” fixative system, balance analyst safety, regulatory requirements, and panel performance. Pilot comparative studies (MFI, CV, % positive, and epitope retention) are essential before wholesale substitution.

Pharmaceutical Uses

Applicability

• This product is a research-grade fixation buffer intended for laboratory workflows (flow cytometry). It is not an excipient or therapeutic and is not intended for human or animal administration.

General context (literature/general)

• While fixation reagents are used in manufacturing quality control and analytical characterization of cell-based products, such uses are procedural and do not imply pharmaceutical-grade status or pharmacopeial compliance.
• Pharmaceutical excipient monographs typically do not cover complex fixation buffer formulations; when a specific chemical (e.g., formaldehyde solution) is used in regulated settings, its grade, purity, and compendial compliance are tightly defined—this cannot be inferred for this product.

Guidance

• For GMP or clinical applications, source materials that explicitly state applicable pharmacopeial compliance and validated manufacturing controls. This BioReagent-grade product is for research use only, as stated by the manufacturer.

Physical Properties

Item-specific facts (from Product Data)

• Physical state/appearance: Not specified for this item; refer to CoA/Spec Sheet.
• Concentration/composition: Not specified for this item; refer to CoA/Spec Sheet.
• pH, osmolality, density, refractive index: Not specified for this item; refer to CoA/Spec Sheet.

Typical properties of fixation buffers (literature/general, not product specifications)

• Matrix: Aqueous, buffered to near neutral pH to minimize epitope denaturation and preserve fluorophore compatibility.
• Common fixatives: Aldehyde-based (e.g., formaldehyde from paraformaldehyde depolymerization) yield covalent protein crosslinks; alternative systems include glyoxal- or alcohol-based fixatives.
• Solubility: Completely miscible with water; typically compatible with saline and most standard permeabilization buffers.
• Temperature sensitivity: Many fixation workflows recommend ambient temperature exposure for limited time (e.g., 10–20 min) followed by cooling or washing; exact conditions are protocol-specific.

Notes

• Do not use literature values above as product specifications; consult the item’s CoA/Spec Sheet for definitive parameters relevant to your assay.

Quality and Grades

Item-specific facts (from Product Data)

• Grade: Sterile-filtered, BioReagent.

What this means (general)

• Sterile-filtered: The solution has been passed through a sterilizing-grade membrane (commonly 0.22 µm) to reduce bioburden and particulates, supporting reproducible flow cytometry and minimizing clogging of cytometers. Note: Sterility is process-based and does not imply aseptic fill unless explicitly stated on the CoA.
• BioReagent: Intended for biological research applications; raw materials and processing are selected to minimize contaminants that may interfere with cellular assays or fluorophores. This grade is distinct from clinical/diagnostic use and from analytical solvent grades.

Quality considerations for fixation buffers (general guidance)

• Low autofluorescence: High-quality buffers are formulated to minimize intrinsic fluorescence that could elevate background in sensitive channels (e.g., FITC, PE). Verify by running matched buffer-only controls.
• Lot-to-lot consistency: Critical for multicolor panels. It is good practice to qualify a new lot by comparing median fluorescence intensity (MFI) shifts and scatter properties on a standard cell preparation.
• Filtration and particulates: Particulate-free solutions reduce clogs and spurious events; gentle mixing avoids bubble formation that can affect fluidics.

Documentation

• For exact composition, pH, acceptable bioburden/endotoxin limits, and UV absorbance profiles (if provided), refer to the specific item’s CoA/Spec Sheet.

Reaction and Applications

Item-specific facts (from Product Data)

• Use: Fixation Buffer for Flow Cytometry; For research use only.

Applications in flow cytometry (literature/general)

• Cell preservation: Fixation stabilizes cellular proteins by covalent crosslinking (aldehydes) or protein precipitation (alcohols), preventing epitope redistribution and enabling delayed acquisition.
• Workflow integration:
  • Surface staining followed by fixation to lock in antibody binding and improve biosafety during acquisition.
  • Fix-then-permeabilize for intracellular staining (cytokines, transcription factors) with saponin- or detergent-based reagents.
  • Compatibility with common RBC lysis buffers and DNA dyes should be confirmed empirically.
• Practical tips:
  • Titrate fixation time and temperature to balance antigen preservation and fluorophore integrity. Over-fixation can reduce signal (lower MFI) and increase nonspecific binding.
  • Thorough washing after fixation reduces background and removes unreacted fixative that can crosslink antibodies in solution.
  • For rare-event analysis, include viability dyes compatible with fixation (amine-reactive “fixable” dyes) prior to fixation.
• Controls:
  • Include unstained, single-stained, and fluorescence-minus-one (FMO) controls processed identically through fixation.
  • Run instrument quality controls post-fixation to confirm that scatter and baseline fluorescence remain within specification.

Notes

• Exact fixation chemistry, concentration, and recommended incubation conditions are not specified for this item; consult the CoA/Spec Sheet and optimize empirically.

Reaction Conditions

Applicability

• As a fixation buffer for biological samples, “reaction conditions” correspond to fixation parameters in cell-processing workflows rather than classical synthetic reaction conditions.

Item-specific guidance

• Recommended incubation time, temperature, buffer-to-sample ratio, and quenching steps: Not specified for this item; refer to CoA/Spec Sheet.

Literature/general guidance for flow cytometry fixation

• Order of operations: For surface markers, many workflows stain first, then fix; for intracellular markers, fix first, then permeabilize and stain.
• Temperature: Ambient temperature fixation is common; cold (4°C) fixation can reduce epitope loss but may slow crosslinking. Avoid elevated temperatures unless validated.
• Time: Short, controlled exposures help maintain fluorescence and epitope integrity; overexposure can cause decreased MFI and increased background.
• Quenching/washing: Post-fix washes in compatible buffer reduce residual reactive species; some protocols include quenchers (e.g., amino-containing buffers) to terminate crosslinking.
• Storage post-fixation: Fixed cells can often be stored at 4°C in buffer for limited periods; verify stability of target signals over time for your panel.

Controls and documentation

• Record exact fixation parameters in the assay SOP and include fixed-controls in every run to track performance drift.

Safety and Handling

Item-specific facts (from Product Data)

• GHS classification, signal word, pictograms, H-statements: Not specified for this item; refer to the product SDS.
• Storage: 2–8°C; shipped on wet ice.

General safety guidance for fixation buffers (literature/general)

• Potential hazards: Many fixation buffers contain aldehydes (e.g., formaldehyde), which are irritants and sensitizers; vapors may be harmful. Avoid inhalation, ingestion, and skin/eye contact. Use in a chemical fume hood or well-ventilated area.
• PPE: Laboratory coat, nitrile gloves (change regularly), and chemical splash goggles. For large volumes or aerosol-generating procedures, consider a face shield and use secondary containment.
• Incompatibilities: Avoid mixing aldehyde-containing fixatives with strong oxidizers, strong bases, or reducing agents; do not combine with bleach-containing cleaners to prevent formation of hazardous gases. Collect waste in properly labeled containers for hazardous waste disposal.
• First aid (overview): If inhaled—move to fresh air; if on skin—wash with soap and water; if in eyes—rinse cautiously with water for several minutes and remove contact lenses if easy to do; if ingested—rinse mouth, do not induce vomiting; seek medical attention in all cases of significant exposure.
• Spill response: Absorb small spills with inert material, ventilate area, and dispose as hazardous waste. For larger spills, evacuate area and follow institutional emergency procedures.

Always defer to the official SDS for authoritative hazard and response information.

Solvent Selection

Applicability

• This product is itself an aqueous fixation buffer rather than a solvent to be selected among alternatives. However, buffer choice influences fluorophore stability, antigen preservation, and compatibility with permeabilization steps.

General guidance (literature/general)

• Polarity and matrix: Water-based, near-neutral pH buffers are typically preferred for flow cytometry to preserve native epitopes and maintain cell morphology.
• Compatibility: Aldehyde-based fixation is generally compatible with most fluorophore-conjugated antibodies but can quench certain tandem dyes or GFP-like fluorescent proteins to varying degrees; always validate with fixed-cell controls.
• Additives: Permeabilization requires separate reagents (e.g., saponin, Triton X-100, digitonin) used post-fixation; choice depends on target localization and epitope sensitivity.
• Alternatives: Alcohol-based fixatives (e.g., cold ethanol or methanol) can improve nuclear antigen exposure but may extract membrane proteins and diminish light scatter resolution.

Comparison snapshot (general)

• Aldehyde buffers: Better morphology preservation; broad antibody compatibility; potential for fluorescence quenching if over-fixed.
• Alcohol fixatives: Rapid precipitation and permeabilization; can reduce side-scatter granularity and strip lipids; less suitable for some surface epitopes.

Recommendation

• Select fixation chemistry based on panel design (fluorophores, antigen types) and downstream processing (barcoding, intracellular staining). Pilot small-scale tests to determine optimal conditions.

Storage and Reconstitution

Item-specific facts (from Product Data)

• Storage conditions: Store at 2–8°C.
• Shipping: Shipped on wet ice.
• Reconstitution: Not applicable; the product is supplied as a ready-to-use buffer unless otherwise stated. Any concentrate/dilution details are not specified for this item; refer to CoA/Spec Sheet.

General guidance (literature/general)

• Do not freeze unless the CoA explicitly permits freezing; repeated freeze–thaw can precipitate components or alter fixation performance.
• Protect from contamination: Open under aseptic conditions if sterility is critical; recap promptly to minimize evaporation and CO2 absorption that may shift pH.
• Aliquoting: For multi-use bottles, consider sterile aliquots to minimize contamination and maintain consistency across experiments.
• Stability/expiry: Follow labeled expiration dating. Discard if turbidity, precipitate, or color change develops, or if performance deviates in control assays.

Notes

• For precise shelf life, pH, and composition-specific storage constraints, consult the product’s CoA/Spec Sheet.
• For research use only.

Structure and Identity

Item-specific facts (from Product Data)

• Product type: Fixation Buffer for Flow Cytometry (ready-to-use solution)
• Grade: Sterile-filtered, BioReagent
• Storage: 2–8°C; shipped on wet ice
• CAS, InChIKey, SMILES, molecular formula, molecular weight: Not specified for this item; refer to CoA/Spec Sheet.

General description (literature/general)

• This product is a prepared aqueous buffer formulated for chemical fixation of cells prior to flow cytometry. Such buffers commonly contain crosslinking aldehydes (e.g., formaldehyde/paraformaldehyde) and stabilizing salts to preserve cell surface and intracellular epitopes. Exact composition varies by manufacturer and application.
• Structural features: As a formulated mixture, the product does not have a single defined molecular structure; instead it is an aqueous solution of one or more fixatives and buffering components designed to maintain near-physiological pH during fixation.
• Functional role: Introduces covalent crosslinks (commonly methylene bridges for aldehyde-based systems) between biomolecules to preserve cellular architecture and antigenicity during downstream staining and analysis.

Synthetic Utility

Not typically applicable

• This product is a formulated biological buffer for cell fixation, not a small-molecule building block or reagent for synthetic organic chemistry. It is not commonly used as a reagent in bond-forming transformations or as a solvent in chemical synthesis.

Where relevant (literature/general)

• Chemical fixation concepts (e.g., aldehyde crosslinking) are mechanistic chemistry in a biological matrix but are not leveraged as synthetic methodologies.

For chemical synthesis needs

• Consider dedicated synthetic-grade reagents and solvents with specified purity profiles, water content, and stabilization appropriate to the target reaction.

Target Specificity

Not applicable to this product

• This item is a fixation buffer and does not possess antigen/epitope specificity, clone identity, isotype, or species reactivity. No antibody or biologic targeting information applies.

Perguntas frequentes

How is this product shipped?

This product ships chilled on wet ice. Unpack on arrival and transfer it to the storage condition stated above.