Unlocking the Power of Cryofixed Specimens: Revolutionizing Chemical Imaging with Enhanced Raman Microscopy

Raman microscopy serves as an invaluable technique for visualizing biological specimens since it can offer chemical insights into specific molecules — like proteins — that are involved in bodily functions. Nevertheless, the Raman signals produced by biological samples tend to be quite faint, allowing background noise to often overshadow them, which can result in subpar images.

The researchers have innovated a microscope capable of preserving the temperature of previously frozen specimens during image acquisition. This advancement has permitted them to generate images that are as much as eight times brighter than those previously accomplished with Raman microscopy.

“One of the principal causes of unclear images is the movement of the subjects being examined,” states the study’s lead author, Kenta Mizushima. “By imaging samples that were frozen and immobile, we could extend exposure times without causing damage. This resulted in high signals relative to the background, increased resolution, and broader fields of view.” The method does not involve stains and does not require chemicals to immobilize the cells, allowing for a highly accurate depiction of processes and cellular behavior.

The team also confirmed that the freezing method preserved the physicochemical conditions of different proteins. This gives the cryofixing approach a noteworthy advantage over traditional chemical fixation methods.

“Raman microscopy adds a complementary tool to our imaging arsenal,” remarks senior author Katsumasa Fujita. “The ability to not only capture cellular images but also to provide data on the distribution and specific chemical states of molecules is extremely beneficial as we continually seek to attain the most comprehensive understanding possible.”

This novel technique can be integrated with other microscopy methods for in-depth analysis of biological specimens and is anticipated to impact various fields in biological sciences, including medicine and pharmacy.