Technovit® 8100 Sections Specifically for Immunohistochemistry

EMS Catalog #14654

Sections with Technovit® 8100 can be used for more than just histological staining; they can also be used for enzyme chemistry and immunohistochemistry.

Technovit® 8100 Glycol Methacrylate is a HEMA-based plastic-embedding system for studies with light microscopy. It is suitable for embedding all tissues in medicine, zoology and botany. Sections of decalcified or briefly decalcified iliac crest biopsies and implanted biomaterials can be used for more than just histological staining; they can also be used for enzyme chemistry and immunohistochemistry.

Material properties

Technovit® 8100 is a combination of a practically odourless plasticizer and a hydrophillic plastic. Technovit® 8100 was specifically developed for cold polymerization (+4°C).

Note: While hardening the embedding form must be hermetically sealed because the polymerization system is oxygen-sensitive.

Overview of the benefits

• Reproducibility and reliability of the embedding due to the constant, documented quality controls of the individual components
• Low polymerization temperature of 10°C to 0°C due to the special catalyst system and the PTFE forms
• Uniform hardening of the block, thus uniform and thinnest possible sections
• Low shrinkage artefacts, thus excellent tissue morphology
• Routine staining, enzyme detection and immunohistochemistry possible
• Haemotological illiac crest biopsies do not need to be decalcified
• Low toxicity due to special combination of plasticizer and catalyst system

Application

Prepare Technovit® 8100 in accordance with the step-by-step instructions. Place the fixated and dehydrated specimens in the infiltration solution. A low temperature and agitation of the specimens is beneficial during the entire embedding process.

Polymerization

Prepare the polymerization mixture according to the instructions and then fill the embedding cavities. Position the infiltrated specimens therein. Hermetically cover the cavities with films. Place on a pre-cooled gel plate or thin layer of ice at 4°C to harden.

The films are removed after polymerization is complete and blocked with Histobloc® and Technovit® 3040.

It is not possible to elute the plastic before staining or reaction.

Product data

Technical data

The following instructions for fixation and dehydration are not necessarily required. Technovit® can also be infiltrated and polymerized after other pre-treatment.

Airtight glass or PE disposable containers (approx. 20 ml) must be used for the entire process!

Tip: The specimens must be constantly agitated during fixation, dehydration and infiltration!

Fixation

In order to achieve optimal immunohistochemical results, it is recommended to work at 4°C throughout the entire embedding process and to aim for short fixation times. Fix the smallest possible pieces of tissue (1mm thickness) in 2% paraformaldehyde in phosphate buffer pH 7.4 at 4°C for 3-4 hours. Subsequently, retreat for 12 hours (overnight) in phosphate buffer pH 7.4 with an additional 6.8% sucrose at 4°C.

Dehydration

Dehydrate the tissue in cold acetone 100% for at least one hour at 4°C. Change as often as possible in the first minutes until the acetone remains clear.

Infiltration

Dissolve in a clean, detergent-free PE or glass container and then place at 4°C. When sealed, the infiltration solution is stable for a maximum of four weeks at 4°C.

Transfer the specimen directly from the acetone to the pre-cooled infiltration solution. The specimens remain therein for 6-10 hours at 4°C.

Polymerization

Measure with standard pipetting aids and mix well in a PE or glass container. Then, carefully mix the infiltrated specimen in a sealed container for approx. five minutes.

The color of the polymerization solution changes first to yellow-green, but after hardening it becomes colorless.

Completely fill the Histoform cavities with a disposable pipette, position the tissue therein and immediately cover with transparent PE film. Multiple films can be used for a cavity in order to hermetically seal the cavity. Do not press out bubbles; rather, apply more polymerization solution and add new film. During polymerization (at least 3 hours) the embedding form must be placed on a cooling plate or thin layer of ice at 4°C. Do not let the form or specimens come into contact with moisture.

Blocking and archiving

Remove the film at room temperature with tweezers once hardening is complete.

The specimens are blocked with Histobloc® and Technovit® 3040 so that they can be removed from the PTFE mold. Store blocks that are not needed immediately (for immunohistochemistry) at a cool temperature in plastic bags or similar.

Processing

One obtains the best cutting results with a rotation microtome, with the Technovit® Histoblade in combination with the Heraeus knife holder or a hard metal knife (glass diamond knife). Tightly clamp the blocks in the totem cam system on the microtome. Dryly remove the sections with forceps and place in a bath (Aqua dest.). Place directly on a coated object holder and let dry for 2 hours or more at 37°C. Dry sections that are not needed immediately (for immunohistochemistry) at room temperature and store for a maximum of five days at 4°C.

Object holder coating

For example, submerse the object holder in a solution of 0.5% alcian blue (8GXL Sigma) at 65°C for 15 minutes or liquidly coat the object holder with 0.1% poly-L-lysine (Sigma). All standard coated object holders may be used.

The sections must dry for at least two hours at 37°C. Place the non-deplasticized sections directly in the stain solution or start with enzymatic pre-treatment.

Example

• Enzymatic pre-treatment: Incubate setions for 5-10 minutes in 0.01% trypsin with 0.1% CaCl (calcium chloride) pH 7.8
• Wash multiple times in phosphate buffer (PBS) for five minutes
• Incubate for two hours at 37°C with primary antibody, change multiple times
• Block the endogenous peroxidase with 0.06% hydrogen peroxyde in phosphate buffer (PBS) (30 minutes at room temperature)
• Wash multiple times in phosphate buffer (PBS) for five minutes
• Incubate with the second antibody for 30 minutes at room temperature
• Wash multiple times in phosphate buffer (PBS) for five minutes
• Diaminobenzidine (DAB) as for cyrostat sections
• 10-15 seconds of counterstaining with hematoxylin
• Blue for three minutes under flowing water
• Cover with glycerine gelatine

Determination of immuno factors is possible with AP, PAAP, APAAP, ABC, avidin-biotin, streptavidin and immunofluorescence methods.

The use of wetting agent, e. g. Tween, in the rinsing buffer is discouraged. The peroxidase should be dissolved in buffer.

With the constantly changing range of new products for histochemistry and immunohistochemistry, is is always advisable to follow the respective manufacturer instructions.

Source of Information

Heraeus Kulzer, 2014

Product Information

Technovit® 8100 Glycol Methacrylate