Toward developing natural histologic stains using anthocyanins: A novel approach.

Area of Science:

• Histotechnology
• Natural Product Chemistry

Background:

• Histological laboratories face daily exposure to hazardous chemicals.
• There is a global emphasis on developing safer, eco-friendly laboratory alternatives.
• Anthocyanins, natural pigments from plants, are explored as potential histological stains.

Purpose of the Study:

• To assess the utility of anthocyanins, specifically from pomegranate juice, as histological stains.
• To evaluate modifications for improving staining characteristics and solution longevity.

Main Methods:

• Pomegranate juice was extracted and used to stain formalin-fixed paraffin-embedded tissue sections.
• Staining involved a 2-hour immersion with periodic monitoring.
• Modifications included adding lemon extract or acetic acid, altering slide orientation, and refrigeration.

Main Results:

• A distinct magenta staining pattern was observed for basal/suprabasal cells, basement membrane, inflammatory cells, and collagen fibers.
• Improvements in staining were noted with lemon extract, horizontal slide orientation, and refrigeration.
• Acetic acid and refrigeration enhanced the longevity of the staining solution.

Conclusions:

• Anthocyanins show potential as viable histological stains due to availability, feasibility, color stability, and non-toxicity.
• Further research is needed to optimize staining characteristics and solution longevity.
• This study provides a basis for future research into natural histological stains.