Nanostructural analysis by atomic force microscopy followed by light microscopy on the same archival slide

Area of Science:

• Biomedical Sciences
• Microscopy Techniques
• Surface Science

Background:

• Integrated ultrastructural and chemical information is crucial in biomedical research.
• Scanning electron microscopy (SEM) provides ultrastructural detail but requires sample coating, hindering subsequent light microscopy.
• Conventional histochemical staining is incompatible with SEM-prepared samples.

Purpose of the Study:

• To present a combined Atomic Force Microscopy (AFM) and histochemical staining protocol.
• To enable simultaneous ultrastructural and biochemical analysis of biological samples on a single slide.
• To demonstrate the compatibility of AFM with standard histochemical staining.

Main Methods:

• Biological samples were examined using AFM in tapping mode without prior coating.
• The same samples were subsequently subjected to conventional histochemical staining protocols.
• Images from AFM were compared with results from light microscopy and histochemistry.

Main Results:

• AFM imaging did not interfere with subsequent histochemical staining procedures.
• Regions analyzed by AFM could be clearly identified using light microscopy.
• Histochemical properties of ultrastructurally defined regions were successfully visualized.

Conclusions:

• Combining AFM with histochemical staining offers a novel approach for integrated ultrastructural and biochemical analysis.
• This method overcomes limitations of SEM by allowing sequential imaging and staining.
• The technique opens new avenues for discovery in the biomedical sciences.