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https://www.readbyqxmd.com/read/28803977/a-comparison-of-canthaxanthine-pickering-emulsions-stabilized-with-cellulose-nanocrystals-of-different-origins
#1
Sheida Hedjazi, Seyed Hadi Razavi
Cellulosic nanocrystals from different origins were made to stabilize the canthaxanthin (CTX) in pickering emulsion. Nanocrystals were obtained by hydrochloric acid hydrolysis. Dynamic light scattering (DLS) demonstrated that the length of solid particles were in the range of 112nm to 4000nm. AFM indicated the needle-like shape of the cotton cellulose nanocrystals (CCNs) and bacterial cellulose nanocrystals (BCNs) and also illustrated the thickness of the particles to be 6 and 7nm respectively. The crystallinity of both BCNs and CCNs was higher than the cellulose source they were isolated (CL: 75...
August 10, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28689962/astaxanthin-analogs-adonixanthin-and-lycopene-activate-nrf2-to-prevent-light-induced-photoreceptor-degeneration
#2
Yuki Inoue, Masamitsu Shimazawa, Ryota Nagano, Yoshiki Kuse, Kei Takahashi, Kazuhiro Tsuruma, Masahiro Hayashi, Takashi Ishibashi, Takashi Maoka, Hideaki Hara
Carotenoids, in particular astaxanthin, possess potent antioxidant capabilities. Astaxanthin also induces NF-E2-related factor 2 (Nrf2), which plays a major regulatory role in the antioxidative response. However, little is known whether the carotenoid, by-products of astaxanthin, activate Nrf2. Toward this end, we screened eight astaxanthin analogs for Nrf2 activation in murine photoreceptor cell line, 661 W, by quantitative reverse transcription-polymerase chain reaction (qRT-PCR). In addition, we monitored cell death in 661 W cells pretreated with astaxanthin analogs or only pretreated for 6 h with astaxanthin analogs and then exposed to light...
June 21, 2017: Journal of Pharmacological Sciences
https://www.readbyqxmd.com/read/28636682/excited-state-characterization-of-carbonyl-containing-carotenoids-a-comparison-between-single-and-multireference-descriptions
#3
Riccardo Spezia, Stefan Knecht, Benedetta Mennucci
Carotenoids can play multiple roles in biological photoreceptors thanks to their rich photophysics. In the present work, we have investigated six of the most common carbonyl containing carotenoids: echinenone, canthaxanthin, astaxanthin, fucoxanthin, capsanthin and capsorubin. Their excitation properties are investigated by means of a hybrid density functional theory (DFT) and multireference configuration interaction (MRCI) approach to elucidate the role of the carbonyl group: the bright transition is of ππ* character, as expected, but the presence of a C[double bond, length as m-dash]O moiety reduces the energy of nπ* transitions which may become closer to the ππ* transition, in particular as the conjugation chain decreases...
June 21, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28428855/conditions-on-the-mexican-moulting-grounds-influence-feather-colour-and-carotenoids-in-bullock-s-orioles-icterus-bullockii
#4
Kaitlin L Sparrow, Kingsley K Donkor, Nancy J Flood, Peter P Marra, Andrew G Pillar, Matthew W Reudink
Carotenoid-based plumage coloration plays a critical role for both inter- and intrasexual communication. Habitat and diet during molt can have important consequences for the development of the ornamental signals used in these contexts. When molt occurs away from the breeding grounds (e.g., pre-alternate molt on the wintering grounds, or stopover molt), discerning the influence of habitat and diet can be particularly important, as these effects may result in important carryover effects that influence territory acquisition or mate choice in subsequent seasons...
April 2017: Ecology and Evolution
https://www.readbyqxmd.com/read/28340146/effect-of-broiler-breeders-fed-with-corn-or-sorghum-diet-and-canthaxanthin-supplementation-on-production-and-reproductive-performance
#5
C E V Bonilla, A P Rosa, A Londero, C B S Giacomini, C Orso, M O Fernandes, S J Paixão, D V Bonamigo
This study was designed to evaluate the effect of corn or sorghum diet and canthaxanthin (CX) supplementation on performance in broiler breeders. A total of 440 females with similar body weight (BW) (3.71 ± 0.14 kg) and 60 roosters were placed in an open-sided house with 20 pens, randomly distributed in a factorial arrangement (2 × 2). There were 4 diets of 2 ingredients; corn (CO) or sorghum (SO) and 2 levels of CX; 6 mg/kg (CX) and 0 mg/kg (NCX) totaling 5 replicate pens of 22 females and 3 males each, from 42 to 65 wk, divided in 2 periods (from wk 42 to 53 and wk 54 to 65)...
June 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28321615/nitrate-reduction-in-haloferax-alexandrinus-the-case-of-assimilatory-nitrate-reductase
#6
Volkan Kilic, Gözde Aydoğan Kilic, Hatice Mehtap Kutlu, Rosa María Martínez-Espinosa
Haloferax alexandrinus Strain TM JCM 10717(T) = IFO 16590(T) is an extreme halophilic archaeon able to produce significant amounts of canthaxanthin. Its genome sequence has been analysed in this work using bioinformatics tools available at Expasy in order to look for genes encoding nitrate reductase-like proteins: respiratory nitrate reductase (Nar) and/or assimilatory nitrate reductase (Nas). The ability of the cells to reduce nitrate under aerobic conditions was tested. The enzyme in charge of nitrate reduction under aerobic conditions (Nas) has been purified and characterised...
March 21, 2017: Extremophiles: Life Under Extreme Conditions
https://www.readbyqxmd.com/read/28213741/assembly-of-photoactive-orange-carotenoid-protein-from-its-domains-unravels-a-carotenoid-shuttle-mechanism
#7
Marcus Moldenhauer, Nikolai N Sluchanko, David Buhrke, Dmitry V Zlenko, Neslihan N Tavraz, Franz-Josef Schmitt, Peter Hildebrandt, Eugene G Maksimov, Thomas Friedrich
The photoswitchable orange carotenoid protein (OCP) is indispensable for cyanobacterial photoprotection by quenching phycobilisome fluorescence upon photoconversion from the orange OCP(O) to the red OCP(R) form. Cyanobacterial genomes frequently harbor, besides genes for orange carotenoid proteins (OCPs), several genes encoding homologs of OCP's N- or C-terminal domains (NTD, CTD). Unlike the well-studied NTD homologs, called Red Carotenoid Proteins (RCPs), the role of CTD homologs remains elusive. We show how OCP can be reassembled from its functional domains...
September 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/28192491/isolation-and-characterization-of-a-novel-electrogenic-bacterium-dietzia-sp-rnv-4
#8
Natalia J Sacco, M Celina Bonetto, Eduardo Cortón
Electrogenic bacteria are organisms that can transfer electrons to extracellular electron acceptors and have the potential to be used in devices such as bioelectrochemical systems (BES). In this study, Dietzia sp. RNV-4 bacterium has been isolated and identified based on its biochemical, physiological and morphological characteristics, as well as by its 16S rRNA sequence analysis. Furthermore, the current density production and electron transfer mechanisms were investigated using bioelectrochemical methods...
2017: PloS One
https://www.readbyqxmd.com/read/28153925/the-formation-and-sequestration-of-nonendogenous-ketocarotenoids-in-transgenic-nicotiana-glauca
#9
Cara L Mortimer, Norihiko Misawa, Laura Perez-Fons, Francesca P Robertson, Hisashi Harada, Peter M Bramley, Paul D Fraser
Ketolated and hydroxylated carotenoids are high-value compounds with industrial, food, and feed applications. Chemical synthesis is currently the production method of choice for these compounds, with no amenable plant sources readily available. In this study, the 4,4' β-oxygenase (crtW) and 3,3' β-hydroxylase (crtZ) genes from Brevundimonas sp. SD-212 were expressed under constitutive transcriptional control in Nicotiana glauca, which has an emerging potential as a biofuel and biorefining feedstock. The transgenic lines produced significant levels of nonendogenous carotenoids in all tissues...
March 2017: Plant Physiology
https://www.readbyqxmd.com/read/28079755/macular-pigment-distribution-responses-to-high-dose-zeaxanthin-supplementation-in-patients-with-macular-telangiectasia-type-2
#10
Rene Y Choi, Aruna Gorusupudi, Kimberley Wegner, Mohsen Sharifzadeh, Werner Gellermann, Paul S Bernstein
PURPOSE: To analyze macular pigment (MP) amount and distribution in patients with macular telangiectasia Type 2 receiving oral zeaxanthin supplementation in a randomized, open-label, interventional trial. METHODS: Eight macular telangiectasia Type 2 patients were randomized to 10 mg or 20 mg of zeaxanthin per day. At each visit, best-corrected visual acuity, contrast sensitivity, fundus biomicroscopy, color fundus photography, autofluorescence imaging, optical coherence tomography, and serum carotenoid levels were tested...
January 10, 2017: Retina
https://www.readbyqxmd.com/read/28005396/the-effect-of-canthaxanthin-on-the-quality-of-frozen-ram-spermatozoa
#11
Helder M Souza, Lúcia C P Arruda, Millena M Monteiro, Igor H A V Nery, Robespierre A J Araújo Silva, André M Batista, Maria Madalena Pessoa Guerra
The addition of antioxidants to semen cryopreservation extenders has been employed for combating oxidative damage. This work aimed to evaluate the addition of carotenoid canthaxanthin to a cryopreservation extender of ram semen. Three breeder rams were used and, after semen collection, with 48-hour intervals between collection, the samples were included in the pool formation (n = 6). The experimental groups comprised 0 (control), 0.1, 1, 10, and 25 μM of canthaxanthin. After thawing (37°C/30 s) and incubation at 37°C for 2 hours, semen aliquots from each group were evaluated for sperm kinetics (CASA), the integrity of the plasma and acrosomal membranes (iPAM), intracellular reactive oxygen species (ROS) production, and lipid peroxidation (LPO) by flow cytometry associated with the image...
June 2017: Biopreservation and Biobanking
https://www.readbyqxmd.com/read/27862054/determination-of-target-fat-soluble-micronutrients-in-rainbow-trout-s-muscle-and-liver-tissues-by-liquid-chromatography-with-diode-array-tandem-mass-spectrometry-detection
#12
Virginia Pérez Fernández, Salvatore Ventura, Pierpaolo Tomai, Roberta Curini, Alessandra Gentili
This paper describes an analytical approach, based on LC-diode array detector-MS/MS (LC-DAD-MS/MS), for characterizing the fat-soluble micronutrient fraction in rainbow trout (Oncorhynchus mykiss). Two different procedures were applied to isolate the analytes from liver and muscle tissue: overnight cold saponification to hydrolyze bound forms and to simplify the analysis; matrix solid-phase dispersion to avoid artifacts and to maintain unaltered the naturally occurring forms. Analytes were separated on a C30 analytical column by using a nonaqueous reversed mobile phase compatible with the atmospheric pressure chemical ionization...
March 2017: Electrophoresis
https://www.readbyqxmd.com/read/27855894/proniosomal-powders-of-natural-canthaxanthin-preparation-and-characterization
#13
Maryam Ravaghi, Chiara Sinico, Seyed Hadi Razavi, Seyed Mohammad Mousavi, Elena Pini, Anna Maria Fadda
In this study, canthaxanthin (CTX) was produced by Dietzia natronolimnaea HS-1 using beetroot molasses as substrate and used for encapsulation in proniosome powders after extraction, with the aim of improving its stability. Proniosome powders were prepared with an equimolar ratio of span 60/cholesterol and four different carriers, namely maltodextrin, mannitol, lactose and pullulan. The properties of these formulations as both proniosomal powders and resulted niosomal dispersions were evaluated. The type of carriers had significant effects on the micrometric properties of proniosome powders which were further confirmed by the results of SEM analysis...
April 1, 2017: Food Chemistry
https://www.readbyqxmd.com/read/27815463/effects-of-dietary-xanthophylls-canthaxanthin-and-astaxanthin-on-n-methyl-n-nitrosourea-induced-rat-mammary-carcinogenesis
#14
Takashi Yuri, Katsuhiko Yoshizawa, Yuko Emoto, Yuichi Kinoshita, Michiko Yuki, Airo Tsubura
BACKGROUND: Natural xanthophylls, canthaxanthin and astaxanthin are known to exhibit anticancer activity. However, the dietary effects of canthaxanthin and astaxanthin on N-methyl-N-nitrosourea (MNU)-induced mammary cancer remain controversial, and their mechanisms of action have not been clearly identified. MATERIALS AND METHODS: Three-week-old female Sprague-Dawley rats were fed a xanthophyll-free (basal diet) diet or experimental diets containing canthaxanthin or astaxanthin (0...
November 2016: In Vivo
https://www.readbyqxmd.com/read/27687695/canthaxanthin-from-molecule-to-function
#15
REVIEW
Tuba Esatbeyoglu, Gerald Rimbach
The aim of this review is to summarize the relevant literature about the use of canthaxanthin in food science and nutrition research. Canthaxanthin is a red-orange carotenoid that belongs to the xanthophyll group. This naturally occurring pigment is present in bacteria, algae and some fungi. Canthaxanthin is also responsible for the color of flamingo feathers, koi carp skin and crustacean shells. Canthaxanthin is widely used in poultry (broiler, laying hens) as a feed additive. Canthaxanthin can be obtained by total synthesis...
June 2017: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27644134/the-effects-of-canthaxanthin-on-porcine-oocyte-maturation-and-embryo-development-in-vitro-after-parthenogenetic-activation-and-somatic-cell-nuclear-transfer
#16
A Taweechaipaisankul, J X Jin, S Lee, G A Kim, B C Lee
The objective of this study was to examine the effects of canthaxanthin (Cx) treatment during in vitro maturation (IVM) of porcine oocytes on embryonic development after parthenogenetic activation (PA) and somatic cell nuclear transfer (SCNT), on intracellular glutathione (GSH) and reactive oxygen species (ROS) levels in mature oocytes, and on gene expression in both PA- and SCNT-derived blastocysts. To determine the optimal effective concentration of Cx, porcine oocytes were cultured in IVM medium supplemented with various concentrations (0, 20, 40 and 80 μM) of Cx for 22 hr...
December 2016: Reproduction in Domestic Animals, Zuchthygiene
https://www.readbyqxmd.com/read/27615726/hplc-quantification-of-astaxanthin-and-canthaxanthin-in-salmonidae-eggs
#17
Milena Tzanova, Mariana Argirova, Vasil Atanasov
Astaxanthin and canthaxanthin are naturally occurring antioxidants referred to as xanthophylls. They are used as food additives in fish farms to improve the organoleptic qualities of salmonid products and to prevent reproductive diseases. This study reports the development and single-laboratory validation of a rapid method for quantification of astaxanthin and canthaxanthin in eggs of rainbow trout (Oncorhynchus mykiss) and brook trout (Salvelinus fontinalis М.). An advantage of the proposed method is the perfect combination of selective extraction of the xanthophylls and analysis of the extract by high-performance liquid chromatography and photodiode array detection...
April 2017: Biomedical Chromatography: BMC
https://www.readbyqxmd.com/read/27613855/the-effect-of-maternal-canthaxanthin-supplementation-and-hen-age-on-breeder-performance-early-chick-traits-and-indices-of-innate-immune-function
#18
M L Johnson-Dahl, M J Zuidhof, D R Korver
Hen age and nutrition influence chick innate immunity. The immunomodulatory antioxidant carotenoid canthaxanthin is transferred from the hen diet to the egg. Antioxidants could protect the chick from bactericidal oxidative species produced by the immune system. Broiler breeder hen diets were supplemented with 0 (Control), 6 (Low), or 12 (High) mg/kg canthaxanthin. Chick early growth and ex vivo innate immunity were measured at 31 to 33 (Early), 45 to 47 (Mid), and 57 to 59 (Late) wk of hen age. Escherichia coli (E...
March 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/27612863/ultrafast-spectroscopy-tracks-carotenoid-configurations-in-the-orange-and-red-carotenoid-proteins-from-cyanobacteria
#19
Václav Šlouf, Valentyna Kuznetsova, Marcel Fuciman, Céline Bourcier de Carbon, Adjélé Wilson, Diana Kirilovsky, Tomáš Polívka
A quenching mechanism mediated by the orange carotenoid protein (OCP) is one of the ways cyanobacteria protect themselves against photooxidative stress. Here, we present a femtosecond spectroscopic study comparing OCP and RCP (red carotenoid protein) samples binding different carotenoids. We confirmed significant changes in carotenoid configuration upon OCP activation reported by Leverenz et al. (Science 348:1463-1466. doi: 10.1126/science.aaa7234 , 2015) by comparing the transient spectra of OCP and RCP. The most important marker of these changes was the magnitude of the transient signal associated with the carotenoid intramolecular charge-transfer (ICT) state...
January 2017: Photosynthesis Research
https://www.readbyqxmd.com/read/27601683/effect-of-broiler-breeders-fed-with-corn-or-sorghum-and-canthaxanthin-on-lipid-peroxidation-fatty-acid-profile-of-hatching-eggs-and-offspring-performance
#20
A P Rosa, C E V Bonilla, A Londero, C B S Giacomini, C Orso, M O Fernandes, J S Moura, R Hermes
The aim of study was to evaluate the effect on broiler breeders fed with corn or sorghum diets and canthaxanthin on lipid peroxidation, fatty acid, and offspring's performance. A total of 440 females with similar body weight (BW) (3.77 ± 0.11 kg) and 60 roosters were placed in an open-sided house with 20 pens, randomly distributed in a factorial arrangement (2 × 2). There were 4 diets of 2 ingredients; corn (CO) or sorghum (SO) and 2 levels of canthaxanthin; 6 mg/kg (CX) and 0 mg/kg (NCX) totaling five replicate pens of 22 females and 3 males each, from 45 to 65 wk old...
March 1, 2017: Poultry Science
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