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Effect of light intensity and wavelengths on photodegradation reactions of riboflavin in aqueous solution

Paper ID Volume ID Publish Year Pages File Format Full-Text
30799 44504 2006 7 PDF Available
Title
Effect of light intensity and wavelengths on photodegradation reactions of riboflavin in aqueous solution
Abstract

A study of the effect of light intensity and wavelengths on photodegradation reactions of riboflavin (RF) solutions in the presence of phosphate buffer using three UV and visible radiation sources has been made. The rates and magnitude of the two major photodegradation reactions of riboflavin in phosphate buffer (i.e., photoaddition and photoreduction) depend on light intensity as well as the wavelengths of irradiation. Photoaddition is facilitated by UV radiation and yields cyclodehydroriboflavin (CDRF) whereas photoreduction results from normal photolysis yielding lumichrome (LC) and lumiflavin (LF). The ratios of the photoproducts of the two reactions at 2.0 M phosphate concentration, CDRF/RF (0.09–0.22) and CDRF/LC (0.54–1.75), vary with the radiation source and are higher with UV radiation than those of the visible radiation. On the contrary, the ratios of LF/LC (0.15–0.25) increase on changing the radiation source from UV to visible. The rate is much faster with UV radiation causing 25% degradation of a 10−5 M riboflavin solution in 7.5 min compared to that of visible radiations in 150–330 min.

Keywords
Riboflavin; Photolysis; Photoaddition; Buffer effect; Light intensity and wavelength effect
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Effect of light intensity and wavelengths on photodegradation reactions of riboflavin in aqueous solution
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 82, Issue 1, 2 January 2006, Pages 21–27
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us