[Watching dance of the molecules - CARS microscopy]

Area of Science:

• Biophysics
• Spectroscopy
• Microscopy

Background:

• Label-free imaging of biological and material samples is crucial for understanding molecular composition.
• Conventional microscopy often requires staining, which can be toxic or alter sample properties.
• Coherent Anti-Stokes Raman Scattering (CARS) microscopy offers intrinsic molecular contrast without exogenous labels.

Purpose of the Study:

• To demonstrate the utility of CARS microscopy for label-free imaging of biological and material samples.
• To showcase CARS microscopy's application in visualizing cellular structures and analyzing cosmetic product composition.
• To highlight CARS microscopy as a complementary technique to fluorescence confocal microscopy.

Main Methods:

• Utilized a near-infrared laser source to generate CARS signals.
• Applied CARS microscopy for imaging lipid droplets within human HaCaT cells.
• Employed CARS microscopy for the compositional analysis of cosmetic products.

Main Results:

• Successfully visualized lipid droplets in living human HaCaT cells without staining.
• Determined the molecular composition of cosmetic products using CARS spectral information.
• Demonstrated the non-toxic, non-destructive, and non-invasive nature of CARS imaging.

Conclusions:

• CARS microscopy provides intrinsic molecular contrast for label-free imaging.
• This technique is valuable for analyzing biological samples like cells and complex materials such as cosmetics.
• CARS microscopy is a versatile and complementary imaging modality with expanding applications in science and industry.