Tissue Deparaffinization
Tissue Deparaffinization - Related Videos
02:43
Deparaffinization and Rehydration of Tissue Sections: A Two-step Procedure to Remove Paraffin Wax from FFPE Tissue Slides Followed by Tissue Rehydration
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2023
In this video, we demonstrate the processing of FFPE or formalin-fixed paraffin-embedded sections obtained from gastrointestinal tumor tissue. The deparaffinization and rehydration steps allow the processing of the tissue specimen for subsequent analytical applications.
05:00
H&E Staining of Paraffin-Embedded Tissue Sections: A Differential Staining Technique to Visualize Liver Tissue Sections Using Combination of Hematoxylin and Eosin Dyes
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2025
In this video, we describe a technique of hematoxylin and eosin staining of paraffin-embedded tissue sections to study their histology. The procedure includes deparaffinization of the tissue followed by staining the cells in the tissue. Upon staining, the nucleus appears distinctly blue, and the proteins in the cytoplasm display pink coloration.
01:18
Immunohistochemical Detection of Pathogenic Bacteria in Human Brain Tissue
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2025
To detect these bacteria, take a deparaffinized, rehydrated, bacteria-infected human brain section with exposed protein antigens and inactivated endogenous phosphatase.
03:53
FFPE Tissue Pretreatment for RNA CISH: A Procedure to Process Formalin-Fixed Paraffin-Embedded Tissue Sections for RNA Chromogenic In Situ Hybridization
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2023
This video demonstrates the steps involved in the pretreatment of FFPE tissue specimens for RNA chromogenic in situ hybridization. The pretreatment process helps maintain nucleic acid integrity within the cells and overall tissue morphology.
04:33
Extracellular DNA Staining: A Method to Identify Extracellular DNA in FFPE Tissue Sections
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2023
This video describes the technique of staining extracellular DNA in FFPE tissue sections. The stained extracellular DNA can be quantitated to determine the efficacy of any therapeutic treatment that leads to the death of cancer cells.
FAQs
An organic clearing solvent first dissolves the paraffin surrounding the section. Graded alcohols then replace the solvent environment progressively, and water completes rehydration. This sequence exposes cellular structures and biomolecules without treating wax removal and water restoration as a single step, helping prepare the specimen for downstream staining or molecular treatment.
Graded alcohols create an intermediate transition between the clearing solvent and water. That staged change supports controlled rehydration rather than an abrupt shift. In practice, the quality of this transition affects whether the section is adequately prepared for hematoxylin and eosin staining, immunohistochemistry, or selected nucleic-acid assays.
Solvent exposure must be sufficient to remove paraffin, but it also requires control because specimen preparation influences morphology and assay quality. Inadequate control can compromise the condition in which cellular structures or biomolecules are presented for analysis. This is especially relevant when the same tissue section is evaluated for structure and biomarker-related findings.
Rehydration determines whether the specimen is in a suitable state for the next analytical step. Histology and immunohistochemistry require accessible tissue for staining, whereas selected nucleic-acid assays require access to biomolecules. Thus, the solvent-to-alcohol-to-water sequence links physical preparation of the section with the cancer analysis that follows.
Begin with the paraffin-embedded section and expose it to an organic clearing solvent to dissolve the wax. Move through graded alcohols, then bring the specimen into water. This workflow creates a controlled transition from wax removal to rehydration, leaving the section prepared for staining or molecular treatment rather than stopping after solvent exposure.
The essential reagents are an organic clearing solvent, a graded series of alcohols, and water. Each has a different role: the solvent addresses paraffin, alcohols provide the staged transition, and water completes rehydration. Maintaining this sequence is important because the reagents are not interchangeable and each step prepares the tissue for the next.
In cancer research, prepared sections can support hematoxylin and eosin histology, immunohistochemistry, and selected nucleic-acid assays. These analyses allow investigators to examine tumor characteristics, detect biomarkers, and compare tissue samples. Deparaffinization therefore serves as a preparation step that helps keep structural and molecular information accessible for comparative studies.