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Influence of pH on the decay of β-carotene radical cation in aqueous Triton X-100: A laser flash photolysis study

Paper ID Volume ID Publish Year Pages File Format Full-Text
29402 44384 2015 6 PDF Available
Title
Influence of pH on the decay of β-carotene radical cation in aqueous Triton X-100: A laser flash photolysis study
Abstract

•The reaction of β-CAR-H+ with −OH is consistent with a two-step mechanism reaction.•Importantly, β-carotene neutral radicals (β-CAR) do not absorb above 550 nm.•β-CAR most probably have similar spectral range as that of β-carotene.

The identification of the spectral information of carotenoid neutral radicals is essential for studying their reactivities towards O2 and thereby evaluating their role in the antioxidant–prooxidant properties of the corresponding carotenoid. Recently, it was reported that β-carotene neutral radical (β-CAR) has an absorption maximum at 750 nm. This contradicts the results of many reports that show carotenoid neutral radicals (CAR) absorb in the same or near to the spectral region as their parent carotenoids. In this manuscript, the influence of pH on the decay of β-carotene radical cation (β-CAR-H+), generated in an aqueous solution of 2% Triton X-100 (TX-100), was investigated, employing laser flash photolysis (LFP) coupled with kinetic absorption spectroscopy, to identify the absorption bands of the β-carotene neutral radicals. By increasing the pH value of the solution, the decay of β-CAR-H+ is enhanced and this enhancement is not associated with the formation of any positive absorption bands over the range 550–900 nm. By comparing these results with the literature, it can be concluded that β-carotene neutral radicals most probably absorb within the same spectral range as that of β-carotene. The reaction pathways of the reaction of β-CAR-H+ with −OH have been discussed.

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Influence of pH on the decay of β-carotene radical cation in aqueous Triton X-100: A laser flash photolysis study
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology B: Biology - Volume 146, May 2015, Pages 68–73
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