Technovit® 9100 Methyl Methacrylate
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Using the Components
The basis solution Technovit 9100 NEW can be used in stabilized or destabilized form. The use of destabilized Technovit 9100 NEW basis solution guarantees results for all immunohistochemical methods analogous to those using paraffin sections.
Destabilizing the Basic Solution
Fill a chromatography column with 50 g aluminum oxide and allow the Technovit 9100 NEW basis solution (Component No. 1) to flow slowly through it. A column prepared as above is sufficient to destabilizes 3 - 4 liters of basis solution. Store the destabilized basis solution in portions in stoppered brown glass bottles and store either at 4°C for shorter periods or at-15°C to -20°C for longer periods of time.
Preparation of a ready-to-use solution from the Components 1-5 of the Technovit 9100 Kit
Procedure: To prepare the solutions for pre-infiltration, infiltration and the stock solutions, see the descriptions in the user instructions.
Please note the storage temperatures!
Preparation of the Polymerization Mixture
Cooled stock solutions A and B should be mixed in the proportion 9 parts A (measuring cylinder) plus 1 part B (pipette) directly before use. This should be performed in a beaker using a glass rod to stir the mixture. The samples are then positioned in containers and completely covered with polymerization mixture, placed in a cooled desiccator and a partial vacuum produced - for example using a water pump - and left to stand at 4°C for ca.. 10 minutes. The resulting blocks are then placed in a sealed container and left to polymerize at between -8°C and -20°C.
Polymerization
The polymerization process takes place at -8°C to -20°C . The samples are then allowed to stand at 4-8°C (Refrigerator) for at least one hour before being allowed slowly to come to room temperature.
The polymerization times are dependent on the volumes of polymerization mixture used and of the constancy of the temperature at which polymerization is carried out. Larger samples should be polymerized at lower temperatures. The cooling capacity of the refrigerator (ice box, deep freezer, freezer-unit with lid) and the volume of polymerization solution should be taken into account - for example with paraffin blocks with lids - when preparing for polymerization. Reproducible results are achieved in the refrigerator by temperatures from ± 0.5°C when Elektronik-Bau temperature regulator is used.
When the prepared samples have been brought to ambient temperature after polymerization is complete, they can be mounted on blocks using Technovit 3040 in order to remove the samples from the Teflon molds.
Preparation of tissues before embedding
Fixing the tissues
The time for fixing is usually between 12 and 24 h and takes place in different solutions depending not only upon the composition of the specimen but also on the antigen or enzyme to be labeled. The following methods of fixation can be used when detecting antigens or enzymes.
- 4% neutral buffered formalin (0.1 mol/l phosphate buffer - or 0.02 mol/l phosphate buffer for pelvic biopsies)
- 10% buffered formalin (0.1 mol/l phosphate buffer)
- Fixation according to Schaffer (Formol/Alcohol).
- 1.4% paraldehyde solution at 4-8°C for 24-48 h. (see table for sensitive detection of enzymes such as alkaline phosphatase and for antigens sensitive to denaturation /structural changes.)
Dehydration, Intermediate and Immersion (Pre-infiltration steps 1 -3, Infiltration)
Dehydration is performed in increasing concentrations of alcohol and can be performed automatically in a suitable device at ambient temperature. If dehydration is incomplete, so-called "Lunker-Stellen" containing pearls of white polymer develop, which can negatively influence the cutting of the block as well as the quality of the sections obtained. Xylol is used as intermediate solution.
Immersion (Pre-infiltration steps 1 -3 plus infiltration) takes place in three stages. Pre-infiltration steps 1 and 2 can be performed automatically in a suitable dehydration device. The times given in the table below are for small spongy and cortical bone samples and pelvic biopsies.
For large tissue samples, the times and volumes should be increased proportionally.
Working with polymerized tissue preparations
Using a Microtome
- JB-4 from EBSciences.
- As above - but for semi-thin sections using a glass or diamond knife. The blocks must be trimmed before cutting.
- Use of 16 mm hardened metal knife with D-form cutting edge or HKS-Knives. When cutting polymerized Technovit 9100 NEW blocks, 30% ethanol (cutting fluid) must be used.
- Transfer sections to super frost plus slides, mount with 50% ethanol (mounting fluid) and cover with PVC-foil (Kisol-foil).
- Remove excess fluid with filter paper. Load the slides into a section-press
Removal of Polymer from the Sections Prior to Staining - All Steps at Ambient Temperature
| Xylene | 2-3 x 20 min | room temperature |
| 2-methoxyethylacetate (2-MEA) | 1 x 20 min | room temperature |
| Pure acetone | 2 x 5 min | room temperature |
| Aqua Dest | 2 x 2 min | room temperature |
| Alternatively: 2-MEA | 3 x 20 min | room temperature |
Routine Staining, Immune Reactions and Enzyme Immunohistochemistry
General Remarks: The following methods for staining of tissues and for detection of signal reactions are given as important examples for processing heavy-duty microtome sections as an introduction to the polymerization system described in this leaflet. They are analogous to those used with methyl methacrylate (MMA) thin sections.
Routine Staining
Counterstaining of Sections for Immuno- and Enzyme-lmmunohistochemistry
| as for paraffin sections |
| Remove polymer from sections | ||
| Fresh Giemsa solution | 30 - 40 min at room temperature | |
| Differentiate and Dehydrate | ||
| Acetone / Xylene (95 : 5) | ||
| Acetone / Xylene (70 : 30) | ||
| Acetone / Xylene (30 : 70) | ||
| Xylene |
Performing the Immune Reaction
| Rinse with buffer | ||
|
Chromogenic substrate solution: Fast Red TR |
15-20 min at room temperature | |
| Counterstain with haematoxylin according to Mayer |
With Acid- and Alkaline Phosphatase
With Esterase Reaction using Naphthol-AS-D-chloracetate
Recipes and Reagents
Buffers and Stock Solutions
Sodium Acetate Stock Solution - 2 mol/l
74.13 g sodium acetate
5.5 ml glacial acetic acid
Make up to 500 ml with distilled water.
Sodium Acetate Buffer - 0.1 mol/l, pH 5.6
50 ml stock solution (see above)
950 ml distilled water adjust pH to 5.6 with either sodium hydroxide (pH too low) or acetic acid (pH too high)
Phosphate Stock Solution - 1 mol/l
112.5 g disodium hydrogen phosphate
30 g potassium dihydrogen phosphate
Make up to 1 litre with distilled water,
Phosphate Buffer - 0.01 mot/I, pH 7.4
10 ml phosphate stock solution (see above)
980 ml distilled water adjust to pH 7.4 with o-phosphoric acid or sodium hydroxide
Make up to 1 litre with distilled water
0.04 mol/l Phosphate Buffered 10% Sucrose - pH 7.4
40 ml phosphate stock solution (see above)
100 g sucrose
1g sodium azide (e.g. 10 ml 10% NaN3 solution)
850 ml distilled water adjust pH to 7.4 (see above) and make up to 1 litre with distilled water.
121.4 g Tris (hydroxymethyt) aminomethane (Tris)
Make up to 1 litre with distilled water.
Tris Buffer - 0.1 mol/l, pH 9.4
100 ml Tris stock solution (see above)
850 ml distilled water
Adjust pH to 9.4 with hydrochloric acid and make up to 1 litre with distilled water.
Stock solutions are best stored in the dark in stoppered brown glass bottles to prevent microbial growth. Diluted buffers can be stored at 4°C, stock solutions at room temperature.
Fixative Solutions
Buffered Formalin Solution (4%)
100 ml 37% formaldehyde (formalin)
4.5 g potassium dihydrogen phosphate
6.5 g disodium hydrogen phosphate
850 ml distilled water.
Adjust the pH to 7.0 with sodium hydroxide or o-phosphoric acid and make up to 1 litre with distilled water.
Paraformaldehyde Stock Solution - 8%
40 g paraformaldehyde
Make up to 500 ml with distilled water
Paraformadehyde Solution - 1.4%
35 ml paraformaldehyde stock solution (see above)
65 ml distilled water
100 ml 0.04 mol/l phosphate buffered 10% sucrose, pH 7.4 (see above)
Reaction Mixtures
3 ml substrate solution
1 Fast Red tablet
120 µl Levamisole
Mix components in a 5 ml stoppered polystyrene or polyethylene test tube. The solution can be then used for approximately 60 min.
Alkaline Phosphatase Substrate / Reaction Mixture
50 ml Tris buffer - 0.1 mol/l, pH 9.4
50 ml Fast Blue Solution
25 mg Naphthol-AS-Bi-phosphate dissolved in 0.5 ml dimethyl sulphoxide (DMSO) / Triton X-100
Acid Phosphatase Substrate / Reaction Mixture
50 ml acetate buffer - 0.1 mol/l, pH 5.6
500 µl Hexonium-Pararosaniline (250 µl Pararosaniline (CI 42500) in 2 mol/l hydrochloric acid + 250 µl 4% sodium nitrite in distilled water - Vortex and allow to react for 5 min before use)
25 mg Naphthol-AS-BI-phosphate in DMSO / Triton X-100 (see above)
Non-Specific Esterase Substrate Reaction Mixture
50 ml phosphate buffer - 0.1 mol/l, pH 6.5
15 mg Naphthot AS-D-chloroacetate in DMSO / Triton X-100 (see above)
250 µl hexonium-pararosaniline (see above)
Staining Solutions
3 ml Giemsa stock solution (Merck)
97 ml distilled water
1 -2 drops of glacial acetic acid.
1 g Light Green SF Yellowish
2 ml glacial acetic acid
Make up to 1000 ml with distilled water.
Phosphomolybdic Acid - Orange-G
30 g phosphomolybdic acid
20 g Orange-G
Make up to 500 ml with distilled water.- add both solutions together
- filtrate
Ponceau-S - Fuchin• Azophloxin
100 ml Masson's solution
20 ml Azophloxin solution
880 ml 0.2 % acetic acidFor Massons solution mix 1 part of Masson's solution A with 2 parts of Massons solution B.
0.5 g azophloxin made up to 100 ml with distilled water
and add 2 ml glacial acetic acid
Source of Information
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