Fluorescence excitation profiles of beta-carotene in solution and in lipid/water mixtures

Riel, M. van; Hammans, Johan Kleinen; Ven, Martin van de; Verwer, W.; Levine, Y.K.

doi:10.1016/0006-291x(83)90437-0

Cited by 21 publications

(6 citation statements)

References 17 publications

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“…As a profound compartment, fat stores carotenoids for a long time, and sufficient amounts remain in the fat tissue to produce a prolonged discoloration for several weeks or months, regardless of serum levels. The direct autofluorescence observed does not appear to be the fact of carotenoids, although this spontaneous fluorescence [14] described in the epidermis is subject to discussion and does not seem to be easily reproducible [15]. …”

Section: Discussionmentioning

confidence: 99%

Orange Palpebral Spots

Assouly¹,

Cavelier‐Balloy²

2008

Dermatology

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We report 27 cases of adults (23 females/4 males, average age 53 years old) presenting yellow-orange pigmented symmetric spots in the internal part of their superior eyelids, different from xanthelasma. Most of them were not aware of their orange palpebral spots (OPS). A systematic observation of adults showed OPS on 15 out of 326 patients. Laboratory investigation carried out in 11 patients did not show particular results except a high level of vitamin E or of total carotenoids in single cases and of β-cryptoxanthin in 5 cases attributed to the high consumption of citrus fruit during winter. In 9 out of the 10 biopsies performed, high-situated fat cells were observed in the reticular dermis, and Fontana pigments (+) in the superficial dermis and sometimes basal keratinocytes. In 1 case yellow-brown autofluorescent microgranular deposits that may correspond to lipofuscin were identified in the superficial dermis. The origin of OPS remains unclear; more than high-situated adipocytes colored by carotenoids, lipofuscin deposit could explain this color, easily visible due to the thinness of the skin in this part of the body. Identifying OPS avoids being mistaken about other pathologies, but further investigations are necessary to understand this entity better.

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Section: Discussionmentioning

confidence: 99%

Orange Palpebral Spots

Assouly¹,

Cavelier‐Balloy²

2008

Dermatology

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“…In experiment (i), the emission band of SQ (centered around 660 nm) does not overlap with the nearest absorption bands of SWNTs (centered around 950 nm). The Stokes shift of β-carotene is measured to be about 70 nm . In experiment (ii), although the absorption band of β-carotene (centered around 480 nm) overlaps a lot with the absorption bands of SWNTs, the overlap between the emission band of β-carotene with the absorption bands of SWNTs should not be very significant.…”

Section: Discussionmentioning

confidence: 84%

“…The Stokes shift of β-carotene is measured to be about 70 nm. 67 In experiment (ii), although the absorption band of β-carotene (centered around 480 nm) overlaps a lot with the absorption bands of SWNTs, the overlap between the emission band of β-carotene with the absorption bands of SWNTs should not be very significant. In experiment (iii), overlap between the emission band of αsexithiophene (centered around 520 nm) and the absorption bands of SWNTs seems to be a little larger than the spectral overlap of experiment (ii).…”

Section: Discussionmentioning

confidence: 90%

Role of Dark Excitons in the Excitation Energy Transfer of Carbon Nanotubes

et al. 2021

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Excitation energy transfer (EET) between single-walled carbon nanotubes (SWNTs) and organic molecules and that between SWNTs have been extensively studied in experiments. Our first-principles calculations based on many-body Green’s function theory show that the Förster’s dipole–dipole coupling approximation fails for the EET of SWNTs, while higher multipole interactions play a major role. This means that donor–acceptor electronic coupling related to the dark excitons of SWNTs may sometimes become several orders of magnitude stronger than that related to the bright ones; therefore, dark excitons might govern the EET of SWNTs. This is in contrast to the general viewpoint that EET is realized through the coupling between bright excitons. Dexter exchange interactions contribute little to the EET of SWNTs even when the donor and acceptor are in close proximity to each other.

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“…~~~-~~~ Fluorescence-excitation profiles of (all-E)-P,P-carotene in solution and in phospholipid mixtures have been obtained. 379 The formation and the stability of two kinds of excitonic complexes of lutein and zeaxanthin in aqueous ethanol have been examined. 380 The absorption spectra of liposomes that contain carotenoids (P,P-carotene, zeaxanthin, astaxanthin, or apocarotenals) and chlorophyll change with temperature, cooling leading to bathochromic shifts.38 The reinforcement of phospholipid bilayers by carotenediols, acting as rigid rivets, has been discussed.38' Energy transfer from P,P-carotene to chlorophyll a was…”

Section: X-raj7 Methodsmentioning

confidence: 99%

Carotenoids and polyterpenoids

Britton¹

1985

Nat. Prod. Rep.

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Fluorescence excitation profiles of beta-carotene in solution and in lipid/water mixtures

Cited by 21 publications

References 17 publications

Orange Palpebral Spots

Orange Palpebral Spots

Role of Dark Excitons in the Excitation Energy Transfer of Carbon Nanotubes

Carotenoids and polyterpenoids

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