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Britton, George; Liaaen‐Jensen, Synnøve; Pfander, Hanspeter

doi:10.1007/978-3-0348-7836-4_2

Cited by 31 publications

(43 citation statements)

References 643 publications

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“…The all trans isomer of β-carotene is the main carotenoid, followed by different other of its geometric isomers. The tentative identification of cis isomers was based on the presence of the "cis-peak" which appears in the UV region of the absorption spectra of carotenoids (around 340 nm) (Britton et al, 1995b). Small amounts of β-cryptoxanthin and β-cryptoxanthin esters and unesterified lutein were also present.…”

Section: Resultsmentioning

confidence: 99%

Carotenoids, Tocopherols and Antioxidant Activity of Lipophilic Extracts from Sea Buckthorn Berries (Hippophae rhamnoides), Apricot Pulp and Apricot Kernel (Prunus armeniaca)

Pop¹,

Diaconeasa²,

Fetea³

et al. 2015

BUASVMCN-FST

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A healthy human diet requires the daily consumption of fruits and vegetables rich in bioactive compounds. Sea buckthorn berries (Hippophae rhamnoides L.) and apricot fruits (Prunus armeniaca L.) are cultivated and appreciated in Romania both as fresh fruits and as derived products. Characterized by a complex chemical composition, sea buckthorn is rich in unsaturated lipids, carotenoids and tocopherols. Except for β-carotene content, less is known about other lipophilic compounds in apricot fruits.The aim of this paper was to separate and quantify the individual carotenoids, tocopherols and tocotrienols in sea buckthorn, apricot pulp and kernels and also to determine the antioxidant activity of the lipophilic extracts using the TEAC method. Chemical characterization of lipophilic extract was performed by HPLC with PDA and fluorescence detection.The total carotenoid content was 17.19±1.4 mg/100g F.W. in sea buckthorn; 3.51±0.25 mg/100g F.W. in apricot fruits and 0.58±0.04 mg/100g F.W. in apricot kernels. The major carotenoids in sea buckthorn were β-carotene, zeaxanthin and β-cryptoxanthin esters. Apricots fruits are rich in β-carotene and its geometric isomers while in kernels we could properly identified only lycopene. The α-tocopherol concentration was higher in sea buckthorn (46 mg/kg) than in apricot fruits (1.09 mg/kg) while apricot kernel contains large amounts of γ-tocopherol (111 mg/kg). Sea buckthorn fruits showed the highest antioxidant capacity, correlated with a high content of both tocopherols and carotenoids.

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Section: Resultsmentioning

confidence: 99%

Carotenoids, Tocopherols and Antioxidant Activity of Lipophilic Extracts from Sea Buckthorn Berries (Hippophae rhamnoides), Apricot Pulp and Apricot Kernel (Prunus armeniaca)

Pop¹,

Diaconeasa²,

Fetea³

et al. 2015

BUASVMCN-FST

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“…We also highlight that this approach must be used with caution in systems with long conjugation pathway because it is known that DFT-based methods fail to accurately describe the BLA of long polyenic chains . However, this approach clearly provides a better description of a set of carotenoid molecules that due to their important role for life ,, and its potential as active materials in molecular electronic devices, will be useful in the design and study of similar molecules.…”

Section: Discussionmentioning

confidence: 99%

“…Among all natural pigments, carotenoids, a group of over 700 compounds500 of which have established electronic structuresare probably the most abundantly found in Nature. These substances can be found in plants, animals, and microorganisms.…”

Section: Introductionmentioning

confidence: 99%

Improving the Description of the Optical Properties of Carotenoids by Tuning the Long-Range Corrected Functionals

Lima

Prado²,

Martins³

et al. 2016

J. Phys. Chem. A

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In this work we use gap-fitting procedure to tune the long-range corrected functionals and accurately investigate the electronic and optical properties of the five main molecules composing Buriti oil (extracted from Mauritia flexuosa L.) in the framework of density functional theory (DFT) and time-dependent (TD) DFT. The characteristic length (1/ω) was observed to be entirely system dependent, though we concluded that its determination is of fundamental importance to rescue geometrical, electronic, and optical properties with accuracy. We demonstrate that our approach of tuning characteristic length for each system resulted in an absorbance spectra in better experimental agreement when compared to the traditional methodology. Therefore, this study indicates that the tuning of the range-separation parameter is crucial to improve the description of the optical properties of conjugated molecules when TDDFT is used. For example, the wavelength of maximum absorption, λmax, for the phytofluene, obtained using B3LYP, is 381 nm, while using the gap-fitting procedure for the tuned-LC-BLYP the estimated λmax changed to 358 nm. The latter estimate is in better agreement with the experimental value of 350 nm.

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“…More than 700 types of carotenoids were identified in nature [19]. They are commonly synthesized by plants, algae, and some micro-organisms.…”

Section: Carotenoidsmentioning

confidence: 99%

Photosynthetic Pigments in Diatoms

Sharma¹,

Singh²,

Srivastava³

2023

Plant Life and Environment Dynamics

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Photosynthetic pigments are bioactive compounds of great importance for the food, cosmetic, and pharmaceutical industries. They are not only responsible for capturing solar energy to carry out photosynthesis, but also play a role in photoprotective processes and display antioxidant activity, all of which contribute to effective biomass and oxygen production. Diatoms are organisms of a distinct pigment composition, substantially different from that present in plants. Apart from light-harvesting pigments such as chlorophyll a, chlorophyll c, and fucoxanthin, there is a group of photoprotective carotenoids which includes β-carotene and the xanthophylls, diatoxanthin, diadinoxanthin, violaxanthin, antheraxanthin, and zeaxanthin, which are engaged in the xanthophyll cycle. Additionally, some intermediate products of biosynthetic pathways have been identified in diatoms as well as unusual pigments, e.g., marennine. Marine algae have become widely recognized as a source of unique bioactive compounds for potential industrial, pharmaceutical, and medical applications. In this review, we summarize current knowledge on diatom photosynthetic pigments complemented by some new insights regarding their physico-chemical properties, biological role, and biosynthetic pathways, as well as the regulation of pigment level in the cell, methods of purification, and significance in industries.

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Main List

Cited by 31 publications

References 643 publications

Carotenoids, Tocopherols and Antioxidant Activity of Lipophilic Extracts from Sea Buckthorn Berries (Hippophae rhamnoides), Apricot Pulp and Apricot Kernel (Prunus armeniaca)

Carotenoids, Tocopherols and Antioxidant Activity of Lipophilic Extracts from Sea Buckthorn Berries (Hippophae rhamnoides), Apricot Pulp and Apricot Kernel (Prunus armeniaca)

Improving the Description of the Optical Properties of Carotenoids by Tuning the Long-Range Corrected Functionals

Photosynthetic Pigments in Diatoms

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