CD Spectroscopy
CD Spectroscopy — Circular dichroism spectroscopy used to determine peptide secondary structure content (alpha-helix, beta-sheet, random coil) in solution.
What Is CD Spectroscopy?
Circular dichroism (CD) spectroscopy measures the differential absorption of left- and right-circularly polarized light by chiral molecules. For peptides, far-UV CD (190-250 nm) provides rapid, quantitative determination of secondary structure content (helix, sheet, random coil) in solution.
Spectral Signatures
- Alpha-helix: Double minimum at 208 and 222 nm, maximum at 193 nm
- Beta-sheet: Single minimum at 218 nm, maximum at 195 nm
- Random coil: Strong minimum near 200 nm, weak signal above 210 nm
- Thermal melt: Monitor 222 nm signal vs. temperature to determine melting temperature (Tm)
Frequently Asked Questions
What is CD Spectroscopy?
Circular dichroism spectroscopy used to determine peptide secondary structure content (alpha-helix, beta-sheet, random coil) in solution.
Why is CD Spectroscopy important in peptide research?
CD Spectroscopy is a fundamental concept in analytical as it relates to peptide science. It directly influences experimental design, compound characterization, and the reliability of research outcomes across biochemistry and molecular biology disciplines.
Authority Sources
- CD Spectroscopy on Wikipedia
- Search CD Spectroscopy on PubChem (NIH)
- Research articles on ScienceDirect