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Characterization of fucoxanthin aggregates in mesopores of silica gel: Electronic absorption and circular dichroism spectroscopies

Paper ID Volume ID Publish Year Pages File Format Full-Text
26458 43954 2015 6 PDF Available
Title
Characterization of fucoxanthin aggregates in mesopores of silica gel: Electronic absorption and circular dichroism spectroscopies
Abstract

•We prepared the conjugates of fucoxanthin in silica gel that has nano-scale pores.•In the conjugates, H- and J-aggregated fucoxanthin were observed by electronic absorption spectroscopy.•The aggregation type was controlled by adjusting the amount of fucoxanthin relative to the silica gel.•H-aggregated fucoxanthin showed the exciton chirality in its CD spectrum.•We calculated the molecular arrangement of H-aggregated fucoxanthin based on the point-dipole approximation.

Fucoxanthin shows a large bathochromic shift of its absorption band when it is bound to photosynthetic antenna pigment–protein complexes derived in brown algae (fucoxanthin–chlorophyll a/c binding protein; FCP). In order to try to understand the intermolecular interactions of fucoxanthin responsible for this shift, we attempted to create a system that can control intermolecular interactions of carotenoids. In this study, we prepared the fucoxanthin–silica gel (CARiACT Q-6, mesoporous material) conjugates by adsorbing fucoxanthin molecules into the mesopores of CARiACT, and investigated their spectroscopic properties by recording electronic absorption and circular dichroism spectra. Fucoxanthin in the pores of CARiACT showed spectra that suggested the formation of H- or J-aggregates. The form of the aggregate could be controlled by adjusting the ratio of fucoxanthin to CARiACT. The exciton chirality of H-aggregated fucoxanthin was detected by circular dichroism spectroscopy. Based on the point-dipole approximation we were able to determine the molecular arrangement of H-aggregated fucoxanthin in the pores of CARiACT.

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Keywords
Carotenoid; Fucoxanthin; Aggregate; Chirality; Mesoporous silica; Mesoporous materials
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Characterization of fucoxanthin aggregates in mesopores of silica gel: Electronic absorption and circular dichroism spectroscopies
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 313, 1 December 2015, Pages 3–8
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