Related Experiment Videos
Photophysics of melatonin in different environments
M C Rath1, H S Mahal, T Mukherjee
1Chemistry Division, Bhabha Atomic Research Centre, Mumbai, India.
Photochemistry and Photobiology
|March 25, 1999
Summary
Melatonin fluorescence is sensitive to its environment and oxygen. Microheterogeneous media, like cyclodextrins and micelles, alter melatonin
Area of Science:
- Photochemistry
- Biochemistry
- Physical Chemistry
Background:
- Melatonin (N-acetyl-5-methoxytryptamine) is a natural hormone structurally similar to tryptophan.
- Melatonin's fluorescence is solvent-dependent and susceptible to quenching by oxygen.
Purpose of the Study:
- Investigate melatonin's fluorescence quenching in various solutions.
- Examine the impact of microheterogeneous media on melatonin's fluorescence.
Main Methods:
- Studied fluorescence quenching in aqueous and organic solutions with different quenchers.
- Investigated inclusion complex formation between melatonin and cyclodextrins.
- Analyzed melatonin fluorescence in microheterogeneous systems (cyclodextrins, micelles, reverse micelles).
Main Results:
- Observed 1:1 inclusion complex formation between melatonin and cyclodextrins in water.
- Found inorganic quenchers (KBr, KI) ineffective in microemulsions.
- Organic quenchers (CCl4, CHCl3) efficiently quenched melatonin fluorescence in microemulsions, similar to organic solvents.
Conclusions:
- Melatonin's fluorescence is significantly influenced by microheterogeneous environments.
- The nature of the quencher (inorganic vs. organic) and the medium dictates fluorescence quenching efficiency.