Spectrophotometer
Spectrophotometer — An instrument that measures the intensity of light absorbed by a sample at specific wavelengths, used for peptide concentration determination.
What Is a Spectrophotometer?
A spectrophotometer measures the absorbance or transmittance of light through a solution at specific wavelengths. In peptide research, UV spectrophotometry at 280 nm (for Trp/Tyr-containing peptides) and 205-220 nm (for peptide bonds) provides rapid, non-destructive concentration measurements and purity assessments.
Applications
- Concentration: A280 measurement using calculated molar extinction coefficient (Beer-Lambert law: A = εlc)
- NanoDrop: Micro-volume spectrophotometer requiring only 1-2 µL of peptide solution
- Standard curves: Colorimetric protein/peptide assays (BCA, Bradford) read at 562 nm or 595 nm
- Kinetics: Real-time monitoring of enzyme activity using chromogenic substrates (pNA at 405 nm)
Frequently Asked Questions
What is Spectrophotometer?
An instrument that measures the intensity of light absorbed by a sample at specific wavelengths, used for peptide concentration determination.
Why is Spectrophotometer important in peptide research?
Spectrophotometer 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
- Spectrophotometer on Wikipedia
- Search Spectrophotometer on PubChem (NIH)
- Research articles on ScienceDirect