Spectroscopic studies of neutral and chemically oxidized species of β-carotene, lycopene and norbixin in CH2Cl2: Fluorescence from intermediate compounds

Alwis, D.D.D.H; Chandrika, U.G.; Jayaweera, P.M.

doi:10.1016/j.jlumin.2014.08.036

Cited by 16 publications

(8 citation statements)

References 24 publications

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“…Finally, the Z ‐isomerized lycopene cation species accept the electron from iron(II) ions to form Z ‐isomers of lycopene in (5) and (6). This proposed mechanism is further supported by a very recent study using fluorescence spectroscopy (Alwis and others ).…”

Section: Resultssupporting

confidence: 73%

Enhanced E/Z Isomerization of (All‐E)‐lycopene by Employing Iron(III) Chloride as a Catalyst

Honda¹,

Kawana²,

Takehara

et al. 2015

Journal of Food Science

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The dietary intake of lycopene, a natural red pigment found in brightly colored vegetables and fruits such as tomatoes and watermelons, has been reported to lower the risk of some diseases, including cancer. Lycopene molecules occur naturally in a long and “straight” shape, but on the other hand lycopene molecules with “bent” forms are highly absorbed by living cells, and showed good antioxidant activity. This study has demonstrated the efficient production of the “bent” lycopene using ionic iron as an accelerator, which is often contained in nutritional supplements.

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Section: Resultssupporting

confidence: 73%

Enhanced E/Z Isomerization of (All‐E)‐lycopene by Employing Iron(III) Chloride as a Catalyst

Honda¹,

Kawana²,

Takehara

et al. 2015

Journal of Food Science

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“…Rao, Satyanarayana, and Rao (), when assessing the aqueous stability extracts containing different norbixin storage conditions, reported that norbixin is easily degraded by the presence of light, need to be stored in light‐protected media. Alwis, Chandrika, and Jayaweera () reported that norbixin and other carotenoids can be easily oxidized, forming intermediate species of free radicals, dienes, epoxides, and peroxides. Probably, the norbixin present in the films suffered degradation by light absorption of the experiment, forming highly reactive degradation compounds or absorbing and transmitting light energy for singlet oxygen formation.…”

Section: Resultsmentioning

confidence: 99%

Biodegradable sodium alginate films incorporated with norbixin salts

Farias

Coutinho

Assis

et al. 2020

J Food Process Engineering

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Plastic packaging derived from petroleum may have a negative impact on the environment when it is not properly recycled. Some studies present the use of biodegradable packages developed from natural polymers as a sustainable alternative; thus, the present work aimed to develop biodegradable sodium alginate films with antioxidant properties by the incorporation of carotenoid norbixin. Norbixin salts at the concentration of 0.01-0.05% were added to the sodium alginate films complexed with calcium ions. Carotenoid incorporation did not significantly impacted with the moisture content and the swelling capacity of the films. The thickness, water activity, and solubility were higher in the films with 0.05% addition of norbixin salts. The presence of the carotenoid improved the thermal stability of the films, as well as the water vapor barrier properties and lower ultraviolet-visible light transmission. However, the incorporation of 0.03% norbixin salts showed the best result for the analysis of antioxidant activity, with lower formation of oxidation products during sunflower oil storage and potential application for high fat foods. Practical ApplicationsResearchers aim to replace synthetic packaging by eco-friendly packaging. The use of alternative materials such as polysaccharides, proteins, and lipids has been studied for the production of packaging susceptible to degradation under environmental conditions. Thus, the present work developed sodium alginate films complexed with calcium and incorporated with norbixin salts able to decrease sunflower oil oxidation.

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“…In the DMF solution, these complexes emit a cyan color with a significant quantum yield. From an application viewpoint, the cyan emission spectra overlap with carotene absorption [ 33 ]. β-carotene is a key compound in grain plants, fruit trees, and other key food resource plants, which absorb solar energy at wavelengths between 500 nm and 550 nm.…”

Section: Introductionmentioning

confidence: 99%

An Efficient Cyan Emission from Copper (II) Complexes with Mixed Organic Conjugate Ligands

et al. 2022

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Copper (II) complexes containing mixed ligands were synthesized in dimethyl formamide (DMF). The intense cyan emission at an ambient temperature is observed for solid copper (II) complexes with salicylic acid and a 12% quantum yield with a fluorescent lifetime of approximately 10 ms. Hence, copper (II) complexes with salicylic acid are excellent candidates for photoactive materials. Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS) reveal that the divalent copper metal centers coordinate with the nitrogen and oxygen lone pairs of conjugate ligands. XPS binding energy trends for core electrons in lower-lying orbitals are similar for all three copper (II) complexes: nitrogen 1s and oxygen 1s binding energies increase relative to those for undiluted ligands, and copper 2p3/2 binding energies decrease relative to that for CuCl2. The thermal behavior of these copper complexes reveals that the thermal stability is characterized by the following pattern: Cu(1,10-phenanthroline)(salicylic acid) > Cu(1,10-phenanthroline)(2,2’-bipyridine) > Cu(1,10-phenanthroline)(1-benzylimidazole)2.

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Spectroscopic studies of neutral and chemically oxidized species of β-carotene, lycopene and norbixin in CH2Cl2: Fluorescence from intermediate compounds

Cited by 16 publications

References 24 publications

Enhanced E/Z Isomerization of (All‐E)‐lycopene by Employing Iron(III) Chloride as a Catalyst

Enhanced E/Z Isomerization of (All‐E)‐lycopene by Employing Iron(III) Chloride as a Catalyst

Biodegradable sodium alginate films incorporated with norbixin salts

An Efficient Cyan Emission from Copper (II) Complexes with Mixed Organic Conjugate Ligands

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