A device for gated autosynchronous luminescence detection

Area of Science:

• Optomechanical instrumentation
• Biophotonics
• Microscopy

Background:

• Delayed luminescence detection (τ > 100 μs) is crucial for sensitive biological imaging.
• Existing methods may struggle with autofluorescence and require complex setups.
• High-resolution imaging of microorganisms like Giardia lamblia cysts presents specific challenges.

Purpose of the Study:

• To develop and characterize a novel optomechanical instrument for sensitive delayed luminescence detection.
• To demonstrate the instrument's capability in imaging Giardia lamblia cysts.
• To evaluate the performance of the device in terms of signal-to-noise ratio and imaging speed.

Main Methods:

• Design and integration of a gated autosynchronous luminescence detector (GALD) into an Olympus BX51 microscope.
• Utilizing a compact high-power UV LED as the excitation source.
• Employing europium chelate/streptavidin conjugate for indirect labeling of Giardia lamblia cysts.

Main Results:

• The GALD device, with dimensions 12x32x90 mm, integrates excitation and detection choppers with a dichroic mirror.
• High-resolution color images of labeled Giardia lamblia cysts were captured within seconds, free from autofluorescence.
• Time-gated luminescence images achieved a signal-to-noise ratio exceeding 114:1 with 100 ms exposure intervals.

Conclusions:

• The GALD is an effective optomechanical instrument for sensitive delayed luminescence detection.
• The device facilitates high-resolution, rapid imaging of biological samples with minimal background noise.
• GALD offers a promising solution for advanced microscopy applications requiring sensitive luminescence detection.