Development of an inexpensive Raman-compatible substrate for the construction of a microarray screening platform

Area of Science:

• Biomaterials Science
• Stem Cell Biology
• Spectroscopy

Background:

• Biomaterial microarrays are crucial for understanding stem cell self-renewal, differentiation, and quiescence.
• Raman microspectroscopy, coupled with multivariate analysis (e.g., PLS-DA), offers non-invasive stem cell fate identification.
• Existing microarrays lack compatibility with Raman microspectroscopy.

Purpose of the Study:

• To develop an inexpensive substrate compatible with both Raman microspectroscopy and biomaterial microarray fabrication.
• To enable non-invasive identification of stem cell fate decisions in response to extrinsic cues.
• To provide a versatile platform for stem cell research.

Main Methods:

• Fabrication of a custom Raman-compatible substrate using standard deposition techniques.
• Functionalization of polyacrylamide (PA) gels on the custom substrate.
• Acquisition and analysis of single-cell Raman spectra using partial least square-discriminant analysis (PLS-DA).

Main Results:

• The custom substrate is compatible with biomaterial microarray construction and Raman microspectroscopy.
• Spectra from living cells on the custom substrate are comparable to those from expensive commercial substrates.
• PLS-DA models accurately identified cell phenotypes from spectra of individual living cells, including stem cells.

Conclusions:

• The developed custom Raman-compatible substrate is an effective and inexpensive platform for biomaterial microarrays.
• This substrate facilitates the non-invasive study of stem cell fate decisions using Raman microspectroscopy.
• The findings support advancements in stem cell research and therapeutic development.