VitroView™ LSAB IHC-DAB Kit (Rat IgG) (150 slides)


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SKU: VB-6019D Category:


LSAB IHC-DAB Kit (Rat IgG) is based on labeled streptavidin-biotin (LSAB) method. This method utilizes a biotinylated secondary antibody that links primary antibodies to streptavidin-peroxidase conjugate. In this method a single primary antibody is subsequently associated with multiple biotin molecules. Therefore, an increase in sensitivity is achieved compared to direct peroxidase-conjugate methods.

Immunohistochemistry (IHC) is a method of detecting the presence of specific proteins in cells of a tissue section by exploiting the principle of antibodies binding specifically to antigens in biological tissues. IHC is widely used in the diagnosis of abnormal cells and basic research to understand the distribution and localization of biomarkers and differentially expressed proteins in different parts of a biological tissue.


LSAB IHC-DAB Kit (Rat IgG) is used for immunohistochemistry for detecting a primary antibody made in Rat.


 RTU normal rabbit serum  15 ml
 RTU biotinylated anti-rat secondary antibody  15 ml
 RTU streptavidin-HRP  15 ml
 DAB stock solution (40×)  0.75 ml
 DAB  buffer  30 ml
 RTU hematoxylin solution  15 ml


           Note: RTU=ready-to-use

Reagents and Material Required but Not Provided

  • Xylene and ethanol
  • Distilled or deionized water
  • 30% hydrogen peroxide
  • 10 mM phosphate-buffered saline (PBS), pH 7.4
  • Triton X-100
  • Mini PAP Pen
  • Primary antibody
  • Mounting Media


Store at 2-8°C.


  1. Preparation of Slides

      For Cell Lines

  • Grow cultured cells on sterile glass cover slips or slides overnight at 37 º C.
  • Wash briefly with PBS.
  • Fix as desired. Possible procedures include: a) 20 minutes with 10% formalin in PBS (keep wet); or b)10 minutes with ice cold methanol, allow to air dry;  or c) 10 minutes with ice cold acetone, allow to air dry.
  • Wash in PBS

       For Frozen Sections

  • Snap frozen fresh tissues in liquid nitrogen or isopentane pre-cooled in liquid nitrogen, embedded in OCT compound in cryomolds. Store the frozen tissue block at -80°C until ready for sectioning.
  • Transfer the frozen tissue block to a cryotome cryostat (e.g. -20°C) prior to sectioning and allow the temperature of the frozen tissue block to equilibrate to the temperature of the cryotome cryostat.
  • Section the frozen tissue block into a desired thickness (typically 5-10 µm) using the cryotome.
  • Place the tissue sections onto glass slides suitable for immunohistochemistry (e.g. Superfrost).
  • Sections can be stored in a sealed slide box at -80°C for later use.
  • Before staining, warm slides at room temperature for 30 minutes and fix in ice cold acetone or ice cold methanol for 10 minutes. Air dry for 30 minutes.
  • Wash in PBS.

      For Paraffin Sections

  • Deparaffinize sections in xylene, 3×5min.
  • Hydrate with 100% ethanol, 2×2min.
  • Hydrate with 95% ethanol, 2×2min.
  • Rinse in distilled water.
  • Follow procedure for pretreatment as required.
  1. Antigen retrieval

Most formalin-fixed tissues require an antigen retrieval step before immunohistochemical staining can proceed.  Heat-mediated and enzymatic antigen retrievals are common methods.

  • For Citrate: Bring slides to a boil in 10 mM sodium citrate buffer, pH 6.0; maintain at a sub-boiling temperature for 10 minutes. Cool slides on bench top for 30 minutes.
  • For EDTA: Bring slides to a boil in 1 mM EDTA, pH 8.0: follow with 15 minutes at a sub-boiling temperature. No cooling is necessary.
  • For TE: Bring slides to a boil in 10 mM TE/1 mM EDTA, pH 9.0: then maintain at a sub-boiling temperature for 18 minutes. Cool at room temperature for 30 minutes.
  • For Pepsin: Digest for 10 minutes at 37°C.

       Note: Do not use this pretreatment with frozen sections or cultured cells that are not paraffin-embedded.

  1. Staining Procedure
  • Rinse sections in PBS-Triton X-100 (0.025%) for 2×2min
  • Serum Blocking: incubate sections with 3-4 drops of RTU normal rabbit serum for 30 minutes to block non-specific binding of immunoglobulin.
  • Primary Antibody: incubate sections with primary antibody (Rat IgG) at appropriate dilution in antibody dilution buffer (CAT#: VB-6002) for 1-2 hour at room temperature or overnight at 4 °C. Rinse in PBS.
  • Peroxidase Blocking (optional): incubate sections in 0.3% hydrogen peroxide in PBS for 10 minutes at room temperature. Rinse in PBS.
  • Secondary Antibody: incubate sections with 3-4 drops of RTU biotinylated anti-Rat secondary antibody for 30 minutes at room temperature.
  • Rinse in PBS for 3x2min.
  • Detection: incubate sections with 3-4 drops of RTU streptavidin-HRP for 30 minutes at room temperature.
  • Rinse in PBS for 3×2min.
  • Chromogen/Substrate: incubate sections with 3 drops of DAB solution for 2-8 minutes. Monitor signal development under a microscope.

Note: DAB solution is made by mixture of 25 µl of DAB stock solution with 1ml of DAB  buffer. 

  • Rinse in distilled water 2×2 min.
  • Counterstain: Incubate sections with 3 drops of RTU hematoxylin solution for 1-2 minutes. Rinse in tape water 2×2 min.
  • Dehydrate through 75% ethanol for 2 min, 95% ethanol for 2 min, and 100% ethanol for 2x3min. Clear in xylene for 2×5 min.
  • Coverslip with mounting medium. 

User Manual (PDF Format)

VB-6019D user manual