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Intracellular Flow Cytometry Kit (Methanol)
Buffers & Dyes
Buffer Kit

Intracellular Flow Cytometry Kit (Methanol) #13593

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Flow Cytometry Image 1: Intracellular Flow Cytometry Kit (Methanol)
To Purchase # 13593
Cat. # Size Qty. Price
1 Kit  (100 tests) $ 184

Reagents Not Included

1. Red blood cell lysis buffer 2. Unconjugated or conjugated primary antibody 3. Fluorochrome-conjugated secondary antibody (if applicable) NOTE: When using any primary or secondary antibody for the first time, titrate the antibody to determine which dilution allows for the strongest specific signal with the least background for your sample. 4. Cellular dyes (e.g., live-dead discrimination, DNA dyes, etc.), optional


All components in this kit are stable for at least 12 months when stored at the recommended temperature and left unused. Formaldehyde fixative should be used within one month after opening. Upon receipt, #13616 should be stored at 4°C. Remaining components should be stored at room temperature.



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#13593 Intracellular Flow Cytometry Kit (Methanol)

NOTE: Prior to using this kit, refer to the product webpage for antibodies of interest to determine whether they are validated for Flow Cytometry (F) assays using a methanol permeabilization protocol.

NOTE: When used in conjunction with fluorescent cellular dyes (including viability dyes, DNA dyes, etc.), please refer to the dye product page for recommended protocol. Visit for a listing of flow cytometry validated cellular dyes.

A. Solutions and Reagents

Supplied Reagents:

  1. 10X Wash Buffer, Phosphate Buffered Saline (PBS) (#12528): Dilute desired amount to a 1X working solution with reverse osmosis deionized (RODI) or equivalent grade water, mix. Store at 4°C and use within one month once diluted.
  2. 4% Formaldehyde, methanol-free (#47746): Store at room temperature. Use within one month once opened.
  3. 100% Methanol (#13604): Keep at room temperature for long-term storage. Chill to -20°C before use.
  4. Flow Cytometry Antibody Dilution Buffer (#13616): Store at 4°C.

Additional Reagents (Not Supplied):

  1. Red blood cell lysis buffer (#46232)
  2. Unconjugated or fluorochrome-conjugated primary antibodies
  3. Fluorochrome-conjugated secondary antibodies (if applicable)
  4. Cellular dyes (e.g., live-dead discrimination, DNA dyes, etc.), optional

B. Fixation

NOTE: Adherent cells or tissue should be dissociated and in single-cell suspension prior to fixation.

NOTE: Antibodies targeting CD markers or other extracellular proteins may be added prior to fixation if the epitope is disrupted by formaldehyde and/or methanol. The antibodies will remain bound to the target of interest during the fixation and permeabilization process. However, note that some fluorophores (including PE and APC) are damaged by methanol and thus should not be added prior to permeabilization. Conduct a small-scale experiment if you are unsure.

  1. Pellet cells by centrifugation and remove supernatant.
  2. Resuspend cells in approximately 100 µl 4% formaldehyde per 1 million cells. Mix well to dissociate pellet and prevent cross-linking of individual cells.
  3. Fix for 15 min at room temperature (20-25°C).
  4. Wash by centrifugation with excess 1X PBS. Discard supernatant in appropriate waste container. Resuspend cells in 0.5-1 ml 1X PBS. Proceed to Permeabilization step.
    1. Alternatively, cells may be stored overnight at 4ºC in 1X PBS.

C. Permeabilization

  1. Permeabilize cells by adding ice-cold 100% Methanol slowly to pre-chilled cells, while gently vortexing, to a final concentration of 90% methanol.
  2. Permeabilize for a minimum of 10 min on ice.
  3. Proceed with Immunostaining or store cells at -20°C in 90% Methanol.

D. Immunostaining

NOTE: Count cells using a hemocytometer or alternative method.

  1. Aliquot desired number of cells into tubes or wells. (Generally, 5x105 to 1x106 cells per assay.)
  2. Wash cells by centrifugation in excess 1X PBS to remove methanol. Discard supernatant in appropriate waste container. Repeat if necessary.
  3. Resuspend cells in 100 µl of diluted antibody or antibody conjugates, prepared in Flow Cytometry Antibody Dilution Buffer (#13616) at the recommended dilutions. See individual antibody datasheets or product webpage for recommended dilution, or determine via titration.
  4. Incubate for 1 hr at room temperature (20-25ºC).
  5. Wash by centrifugation in excess 1X Wash Buffer. Discard supernatant. Repeat.
  6. If using fluorochrome-conjugated primary antibodies, resuspend cells in 200-500 µl 1X Wash Buffer and analyze on flow cytometer. For unconjugated primary antibodies, proceed to next step.
  7. Resuspend cells in fluorochrome-conjugated secondary antibody, diluted in Flow Cytometry Antibody Dilution Buffer (#13616) at the recommended dilution.
  8. Incubate for 30 min at room temperature (20-25ºC).
  9. Wash by centrifugation in excess 1X Wash Buffer. Discard supernatant. Repeat.
  10. Resuspend cells in 200-500 µl 1X Wash Buffer and analyze on flow cytometer.

posted August 2018

revised June 2020

Protocol Id: 1728

Product Description

The Intracellular Flow Cytometry Kit provides the supporting reagents needed to preserve protein states and enable antibodies to bind intracellular targets, for flow cytometric analysis of cells in suspension. This kit contains sufficient reagents for 100 individual samples when following the included protocol.

IMPORTANT: Please refer to the antibody product page to determine if it is validated for use in Flow Cytometry (F) and for information regarding appropriate antibody dilution. Some primary antibodies may require detergent permeabilization, which will be noted on the datasheet. Detergent is not included in this kit.
CAS 26628-22-8, 67-56-1, 50-00-0

Limited Uses

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Products are labeled with For Research Use Only or a similar labeling statement and have not been approved, cleared, or licensed by the FDA or other regulatory foreign or domestic entity, for any purpose. Customer shall not use any Product for any diagnostic or therapeutic purpose, or otherwise in any manner that conflicts with its labeling statement. Products sold or licensed by CST are provided for Customer as the end-user and solely for research and development uses. Any use of Product for diagnostic, prophylactic or therapeutic purposes, or any purchase of Product for resale (alone or as a component) or other commercial purpose, requires a separate license from CST. Customer shall (a) not sell, license, loan, donate or otherwise transfer or make available any Product to any third party, whether alone or in combination with other materials, or use the Products to manufacture any commercial products, (b) not copy, modify, reverse engineer, decompile, disassemble or otherwise attempt to discover the underlying structure or technology of the Products, or use the Products for the purpose of developing any products or services that would compete with CST's products or services, (c) not alter or remove from the Products any trademarks, trade names, logos, patent or copyright notices or markings, (d) use the Products solely in accordance with CST's Product Terms of Sale and any applicable documentation, and (e) comply with any license, terms of service or similar agreement with respect to any third party products or services used by Customer in connection with the Products.

For Research Use Only. Not For Use In Diagnostic Procedures.
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