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Tissue fixation with phenol—formaldehyde for routine histopathology

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Summary

The addition of 2% phenol had a marked accelerating effect on neutral buffered 4% formaldehyde as a fixative. Histopathological material fixed in buffered phenol—formaldehyde (pH7.0) and rapidly advanced to paraffin in an enclosed tissue-processor showed improved nuclear and cytoplasmic detail, reduced shrinkage and distortion, and an absence of formalin pigment. Good results were obtained in less time when sequential fixation in phenol—formaldehyde buffered to pH7.0 and pH5.5 was carried out at an elevated temperature (40°C) in the enclosed tissue-processor. Standard histological stains and immunoperoxidase methods worked well. In resin-embedded tissue, buffered phenol—formaldehyde (pH7.0) gave satisfactory ultrastructural results. The penetration rate of buffered phenol—formaldehyde (pH7.0) in gelatin models did not differ from that of neutral buffered 4% formaldehyde. Polyacrylamide gel electrophoresis showed enhanced protein polymer formation with buffered phenol—formaldehyde (pH7.0) as compared with neutral buffered 4% formaldehyde. Protein polymer formation increased in response to increased time and temperature. Cells fixed in suspension in buffered phenol—formaldehyde (pH7.0) and neutral buffered 4% formaldehyde showed similar volume changes.

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Hopwood, D., Slidders, W. & Yeaman, G.R. Tissue fixation with phenol—formaldehyde for routine histopathology. Histochem J 21, 228–234 (1989). https://doi.org/10.1007/BF01747525

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  • DOI: https://doi.org/10.1007/BF01747525

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