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Xylene-Free Papanicolaou Staining
Suhas Dhende1, Saleem Pathuthara1, Maya Uke1
1Department of Cytopathology, Tata Memorial Hospital, Tata Memorial Centre, Homi Bhabha National Institute, Mumbai, India.
Acta Cytologica
|August 12, 2024
Summary
Pine oil (PO) is a safe, economical, and effective alternative to xylene (XL) for Papanicolaou staining. This study found PO comparable to XL in clearing ability and staining quality, with added benefits of reduced toxicity and pleasant odor.
Area of Science:
- Histopathology
- Cytopathology
- Chemical Safety
Background:
- Xylene (XL) is a common but hazardous clearing agent in Papanicolaou staining.
- Exposure to XL poses health risks, necessitating safer alternatives.
- Pine oil (PO), Eucalyptus oil (EO), and Limonene (LM) are potential less hazardous substitutes.
Purpose of the Study:
- To compare the efficacy of PO, EO, and LM against XL as clearing agents in Papanicolaou staining.
- Evaluate clearing ability, staining quality, and morphological preservation.
- Assess physical properties and cost-effectiveness.
Main Methods:
- Fifty serous effusion samples were Papanicolaou stained, with smears cleared using XL (control), PO, EO, or LM.
- Clearing, staining, and morphology were graded and a Quality Index (QI) calculated.
- Physical properties and reagent costs were compared.
Main Results:
- Pine oil (PO) demonstrated a Quality Index (QI) of 0.96, statistically similar to xylene (XL).
- Eucalyptus oil (EO) also showed comparable results (QI=0.92), while Limonene (LM) was significantly less effective (QI=0.54).
- PO and LM had pleasant odors, unlike XL and EO; PO was the most economical.
Conclusions:
- Pine oil (PO) is a viable, natural, less toxic, and economical substitute for xylene (XL) in Papanicolaou staining.
- PO offers comparable clearing and staining quality with improved safety and cost benefits.
- Further research may support wider adoption of PO in cytopathology laboratories.
