A multipurpose specimen-carrier for handling small biological objects through critical point drying

Area of Science:

• Microscopy and sample preparation techniques
• Cell biology and ultrastructure analysis
• Materials science for scientific instrumentation

Background:

• Critical point drying is essential for preserving biological specimens for electron microscopy.
• Handling and drying minute or delicate specimens, such as free cells, presents significant challenges, risking loss or damage.
• Existing methods may not adequately protect specimens from unintentional air-drying or physical manipulation during processing.

Purpose of the Study:

• To describe a novel specimen-carrier designed for critical point drying.
• To ensure safe handling, protection, and drying of minute biological specimens (down to 1.0 µm).
• To enable processing of free, unattached cells or subcellular fragments without loss or risk of air-drying.

Main Methods:

• Development and description of a specialized specimen-carrier.
• Integration of the carrier into the critical point drying workflow.
• Testing the carrier's efficacy with minute biological specimens, including free cells and subcellular fragments.

Main Results:

• The specimen-carrier facilitates safe handling and protection of specimens throughout the critical point drying process.
• Minute biological specimens down to 1.0 µm can be successfully processed.
• Free, unattached cells and subcellular fragments were processed without loss and without unintentional air-drying.

Conclusions:

• The described specimen-carrier is an effective tool for critical point drying of delicate and minute biological samples.
• This device mitigates risks associated with specimen loss and air-drying, improving sample integrity.
• The innovation supports advanced research in cell biology and ultrastructure by enabling reliable sample preparation.