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Photophysical Chemistry Lab
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The lab explores ways to prevent singlet oxygen from being generated by light.
AboutAbout the lab
Suppressing light-induced oxidation at the stage of its generation
The Photophysical Chemistry Lab studies methods to suppress the generation itself of singlet oxygen produced by photosensitization reactions.
Singlet oxygen is a reactive oxygen species with strong oxidizing power, and it is known to be deeply involved in the oxidation of lipids in food, the photoaging of skin, and the photodegradation of materials.
The lab develops molecules that suppress the generation of singlet oxygen when biological molecules such as riboflavin absorb light, and investigates the elementary processes through which this suppression occurs.
Associate Professor Azusa Kikuchi's areas of expertise are photophysical chemistry, photochromism, and organic UV absorbers.
Key terms
- Singlet oxygen
- A type of reactive oxygen species with strong oxidizing power. It is involved in the oxidation of lipids in food, the photoaging of skin, and the photodegradation of materials
- Xanthene dyes
- Dyes widely used as common colorants in foods, cosmetics, and the textile industry
- Riboflavin
- A representative example of a photosensitizing molecule found in living organisms. It is also used as a food dye
ResearchResearch themes
Singlet oxygen produced by photosensitization reactions is involved in the oxidation of food and the photodegradation of materials. This lab works on developing molecules that suppress the generation of singlet oxygen itself, and on clarifying the elementary processes through which this suppression occurs.
*Illustrative imageSuppressing singlet oxygen generated by food dyes
The lab showed that the amino acid tryptophan suppresses the generation of singlet oxygen in xanthene dyes, which are used as dyes in foods and cosmetics. The lab clarified that this effect arises because tryptophan quenches the triplet state of the dye.
Suppressing singlet oxygen generated by molecules in living organisms
The lab is working to develop molecules that suppress the generation of singlet oxygen for photosensitizing molecules found in living organisms, such as riboflavin. By identifying the elementary processes of this suppression, the lab aims to build the scientific foundations needed to freely control singlet oxygen generation in living organisms and in food.
MembersFaculty
- Associate ProfessorAzusa Kikuchi
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Singlet oxygen Glow” Nekitmm / CC BY-SA 4.0 (cropped)
- Suppressing singlet oxygen generated by food dyes: “Rainbow of food natural food colors” Skoot13 / CC BY-SA 3.0 (cropped)
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