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Tytuł:
α-Carotene and its derivatives have a sole chirality in phototrophic organisms?
Autorzy:
Takaichi, Shinichi
Murakami, Akio
Mochimaru, Mari
Yokoyama, Akiko
Powiązania:
https://bibliotekanauki.pl/articles/1039810.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
red algae
chirality
β-carotene
algae
carotenoid
α-carotene
Opis:
Carotenoids in eukaryotic phototrophic organisms can be classified into two groups; β-carotene and its derivatives, and α-carotene and its derivatives. We re-examined distribution of α-carotene and its derivatives among various taxa of aquatic algae (17 classes) and land plants. α-carotene and its derivatives were found from Rhodophyceae (macrophytic type), Cryptophyceae, Euglenophyceae, Chlorarachniophyceae, Prasinophyceae, Chlorophyceae, Ulvophyceae, Charophyceae, and land plants, while they could not be detected from Glaucophyceae, Rhodophyceae (unicellular type), Chryosophyceae, Raphidophyceae, Bacillariophyceae, Phaeophyceae, Xanthophyceae, Eustigmatophyceae, Haptophyceae, and Dinophyceae. We also analyzed the chirality of α-carotene and/or its derivatives, such as lutein and siphonaxanthin, and found all of them had only (6'R)-type, not (6'S)-type.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 159-161
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Are lycopene metabolites metabolically active?
Autorzy:
Ford, Nikki
Erdman, John
Powiązania:
https://bibliotekanauki.pl/articles/1039758.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
lycopenoids
carotene-monooxygenase
testosterone
lycopene
Opis:
Lycopene is the most abundant carotenoid found in tomatoes and thus has been touted as the bioactive component for the reduced risk of chronic diseases such as prostate cancer. We and others hypothesize that lycopene metabolites are responsible for positively modulating biomarkers and risk factors for the prevention of chronic diseases. Lycopene metabolites circulate in serum and accumulate in tissues at concentrations equivalent to bioactive retinoids. Recent studies report that lycopene metabolites reduce the proliferation of cancer cells, induce apoptosis, enhance gap junction communication between cells, alter normal cell cycle progression, and modulate androgen signaling pathways. Here we review recent literature and provide new evidence to suggest that lycopene metabolites may be bioactive at physiological concentrations.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 1-4
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Radiation effects on vitamin A and ßeta-carotene contents in liver products
Autorzy:
Taipina, M.
del Mastro, N.
Powiązania:
https://bibliotekanauki.pl/articles/148574.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
vitamin A
ßeta-carotene
ionizing radiation
Opis:
he movement toward commercialization of the process and the recent actions of various governmental agencies to accept irradiated foods as wholesome, even when high doses are applied has stimulated increased interest in this treatment. Concern for the fate of vitamins when foods are irradiated is almost entirely centered on maintenance of their biological function as essential nutrients. The aim of this work was to assess the effects of ionizing radiation on vitamin A and ßeta-carotene contents in commercialized food products of animal origin, specifically fresh bovine liver and pork pâté de foie. As present Brazilian legislation has no restriction of dose limits to be applied on foods, the 60Co gamma irradiation doses for these experiments were 3 kGy and 30 kGy. The results show a full retention of vitamin content when the applied dose was 3 kGy and a loss of about 60% when the dose was 30 kGy. When applying high doses, it would be necessary to consider this content reduction and proceed to a vitamin supplement when necessary.
Źródło:
Nukleonika; 2003, 48, 1; 9-11
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Spectroscopy analysis for simultaneous determination of lycopene and β-carotene in fungal biomass of Blakeslea trispora
Autorzy:
Soroka, Iaroslav
Narushin, Valeriy
Turiyansky, Yuriy
Tyurenkov, Alexey
Powiązania:
https://bibliotekanauki.pl/articles/1039776.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
UV-vis analysis
β-carotene
lycopene
Opis:
Blakeslea trispora is a good alternative source for producing such carotenoids as lycopene and β-carotene. The objective of this research was to elaborate a method for the simultaneous determination of lycopene and β-carotene in Blakeslea trispora products using a usual UV-vis spectrophotometer. The standard solutions of the mixture of different concentrations of β-carotene and lycopene were measured with the UV-vis method and correlation formula for the extinction coefficients of 1% standard solution of lycopene in the solvent (hexane) and the ratios of the optical densities at the character peaks of 470 and 502 nm was elaborated. This gives a possibility to calculate the concentrations of lycopene and β-carotene in the mixture. The prediction quality of the UV-vis method was sufficient and the obtained results were very close to the ones, being measured with the HPLC technique. The proposed method can be used for both routine industrial work and academic research, providing the rapid analysis for simultaneous measurements of lycopene and β-carotene.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 65-69
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Synthesis of highly 13C enriched carotenoids: access to carotenoids enriched with 13C at any position and combination of positions
Autorzy:
Lugtenburg, Johan
Dawadi, Prativa
Powiązania:
https://bibliotekanauki.pl/articles/1039761.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
astaxanthin
β-carotene
zeaxanthin
canthaxanthin
spheroidene
Opis:
Carotenoids and their metabolites are essential factors for the maintenance of important life processes such as photosynthesis. Animals cannot synthesize carotenoids de novo, they must obtain them via their food. In order to make intensive animal husbandry possible and maintain human and animal health synthetic nature identical carotenoids are presently commercially available at the multi-tonnes scale per year. Synthetically accessible 13C enriched carotenoids are essential to apply isotope sensitive techniques to obtain information at the atomic level without perturbation about the role of carotenoids in photosynthesis, nutrition, vision, animal development, etc. Simple highly 13C enriched C1, C2 and C3 building blocks are commercially available via 99% 13CO. The synthetic routes for the preparation of the 13C enriched building blocks starting from the commercially available systems are discussed first. Then, how these building blocks are used for the synthesis of the various 13C enriched carotenoids and apocarotenoids are reviewed next. The synthetic Schemes that resulted in 13C enriched β-carotene, spheroidene, β-cryptoxanthin, canthaxanthin, astaxanthin, (3R,3'R)-zeaxanthin and (3R,3'R,6'R)-lutein are described. The Schemes that are reviewed can also be used to synthetically access any carotenoid and apocarotenoid in any 13C isotopically enriched form up to the unitarily enriched form.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 11-16
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modulation of the human preadipocyte mitochondrial activity by beta-carotene
Autorzy:
Śliwa, Agnieszka
Góralska, Joanna
Czech, Urszula
Gruca, Anna
Polus, Anna
Zapała, Barbara
Dembińska-Kieć, Aldona
Powiązania:
https://bibliotekanauki.pl/articles/1039768.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
oxidative phosphorylation
preadipocytes
mitochondria
beta-carotene
Opis:
Increased ROS generation by the overload by metabolic substrates mitochondria paralleled by decrease of antioxidant activity are typical events found in metabolic syndrome and diabetes type 2. Metabolites of beta-carotene (BC) such as retinoic acid (RA), as well as low concentration of reactive oxygen species (ROS) modify the mitochondrial bioenergetic function. The aim of the study was to investigate the effect of beta-carotene on mitochondrial activity in human preadipocytes. BC used in concentrations, 10 or 30 µM, decreased mitochondrial membrane potential, inhibited mitochondrial respiration and decreased cellular ATP content. We conclude, that BC, the known antioxidant may decrease oxidative phosphorylation capacity of mitochondria.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 39-41
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Karotenoidy rola biologiczna i występowanie w owocnikach grzybów
Biological function of carotenoids and their occurrence in the fruiting bodies of mushrooms
Autorzy:
Muszyńska, Bożena
MASTEJ, Małgorzata
SUŁKOWSKA – ZIAJA, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1033726.pdf
Data publikacji:
2016
Wydawca:
Zakład Opieki Zdrowotnej Ośrodek Umea Shinoda-Kuracejo
Tematy:
"antioxidant activity"
"carotenoids"
"edible mushrooms"
"β
β-carotene"
Opis:
Due to the valuable properties of carotenoidsthe interest in new methods of obtaining them is still increasing. For this purpose, since the 60s of the twentieth century, scientists conducted numerous studies to recognize the processes in which carotenoids could be produced . Carotenoids, revealing a strong antioxidant activity, act as free radical scavengers. These compounds can support many beneficial processes such as the stimulation of the immune system, the modulation of intracellular signaling pathways, the regulation of the cell cycle and apoptosis as well as theregulation of growth factors. Carotenoids were determined by spectrophotometric analysis in the following fungal species: Leucopaxillus giganteus, Sarcodon imbricatus, Lactarius piperatus, Lactarius deliciosus, Agaricus arvensis, Agaricus bisporus, Agaricus romagnesii, Agaricus silvaticus, Agaricus silvicola, Hypholoma fasciculare, Calocybe gambosa, Craterellus cornucopioides, Marasmius oreades. High performance liquid chromatography (HPLC) coupled with a UV detector detected β,β-carotene in Agaricus bisporus, Polyporus squamosus, Lepista nuda, Russula delica, Verpa conica, Pleurotus ostreatus and Hypsizgus marmoreus. β-carotene and lycopene were also found in three wild species of edible mushrooms: Leucopaxillus giganteus, Sarcodon imbricatus and Agaricus arvensi. These compounds were isolated in several species of the family Cantharellus as well. One example is Cantharellus cibarius, which contains mainly β,β-carotene and minor amounts of lycopene, α-carotene and other carotenoids, which may be δ – and γ – isomers.
Źródło:
Medicina Internacia Revuo; 2016, 27, 107; 113-122
0465-5435
Pojawia się w:
Medicina Internacia Revuo
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cytotoxicity of β-carotene cleavage products and its prevention by antioxidants
Autorzy:
Alija, Avdulla
Bresgen, Nikolaus
Bojaxhi, Ekramije
Vogl, Cornelia
Siems, Werner
Eckl, Peter
Powiązania:
https://bibliotekanauki.pl/articles/1040406.pdf
Data publikacji:
2010
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
β-carotene cleavage products
necrosis
antioxidants
apoptosis
hepatocytes
Opis:
When we investigated the genotoxicity of β-carotene cleavage products (CPs) in primary rat hepatocytes stimulated to proliferate, we observed dose-dependent increases of chromosomal aberrations, sister chromatid exchanges and micronuclei. In contrast to other genotoxic substances, however, this increased genotoxicity was not accompanied by increased cytotoxicity. As a consequence we observed metaphases showing massive chromosomal damage, indicating inhibition of apoptosis by CPs enabling these cells to proceed in the cell cycle. Since proliferative stimulation by growth factors may support this effect, the in vitro toxicological effects of CPs were studied on proliferatively quiescent primary rat hepatocytes. A significant increase of both apoptosis and necrosis was found. Supplementation with antioxidants did not significantly lower the level of apoptosis, while the level of necrosis was significantly reduced by Trolox and N-acetylcysteine at all concentrations tested as well as ascorbic acid (50 µM) and a combination of Trolox (50 µM) and ascorbic acid (50 µM). These observations indicate that a) the cytotoxic potential in combination with the genotoxic potential of CPs may promote the initiation of cells due to compensatory cell division in exposed tissues and may aggravate inflammatory processes under chronic exposure, and b) the applied antioxidants may protect from cytotoxicity primarily via the detoxification of aldehydic β-carotene cleavage products.
Źródło:
Acta Biochimica Polonica; 2010, 57, 2; 217-221
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Atomic force microscopy studies of the adhesive properties of DPPC vesicles containing β-carotene
Autorzy:
Augustyńska, Dominika
Jemioła-Rzemińska, Małgorzata
Burda, Kvetoslava
Strzałka, Kazimierz
Powiązania:
https://bibliotekanauki.pl/articles/1039795.pdf
Data publikacji:
2012
Wydawca:
Polskie Towarzystwo Biochemiczne
Tematy:
atomic force microscopy
dipalmitoylphosphatidylcholine
β-carotene
liposome adhesion
thermal transition
Opis:
A role of carotenoids as modulators of physical properties of model and biological membranes has been already postulated. However, there is a lack of information on the influence of these pigments on interactions between the lipids which form such membranes. This paper applies atomic force microscopy (AFM) in to study the effects of β-carotene on the adhesion properties of DPPC multilamellar liposomes. This allowed us to gain, for the first time, a direct insight into the interactions between the components in model systems on a molecular level. We observe that the adhesive forces in DPPC multilamellar liposomes containing 1mol% of β-carotene decrease exponentially with increasing temperature, and that at about 37°C they diminish. In the case of pure liposomes the decline in adhesion is of a different nature and the adhesive forces disappear at 34°C. The adhesive forces are about 5 times higher at 31°C in the presence of β-carotene than in its absence. However, measurements using differential scanning calorimetry (DSC) showed a shift of the lamellar-to-undulled-lamellar phase transition toward lower temperatures by about 0.8±0.2°C in a system containing β-carotene. The enthalpy changes (ΔH) of this transition are similar for both systems. For the main transition, gel-to-liquid crystalline, the peak is shifted by about 0.5±0.1°C, and ΔH decreases by about 30% in liposomes treated with β-carotene in comparison to pure liposomes. Our results suggest increased cooperation between liposome components in a system with enriched β-carotene, which cause a change in phase transition temperatures. Moreover, these interactions are very sensitive to temperature.
Źródło:
Acta Biochimica Polonica; 2012, 59, 1; 125-128
0001-527X
Pojawia się w:
Acta Biochimica Polonica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sprouting Exert Significant Influence on the Antioxidant Activity in Selected Pulses (Black Gram, Cowpea, Desi Chickpea and Yellow Mustard)
Autorzy:
Khyade, Vitthalrao B.
Jagtap, Sharad G.
Powiązania:
https://bibliotekanauki.pl/articles/1190118.pdf
Data publikacji:
2016
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Ascorbic acid
β-carotene
DPPH
flavonoid
sprouts
total antioxidant activity
Opis:
Pulses are a vital source of plant-based proteins and amino acids for people around the globe and should be eaten as part of a healthy diet to address obesity, as well as to prevent and help manage chronic diseases such as diabetes, coronary conditions and cancer; they are also an important source of plant-based protein for animals. Pulses provide protein and fibre, as well as a significant source of vitamins and minerals, such as iron, zinc, folate, and magnesium, and consuming half a cup of beans or peas per day can enhance diet quality by increasing intakes of these nutrients. The present attempt deals with comparison antioxidant activities of various sprouts of selected pulses. The β-carotene, ascorbic acid, total antioxidant activity, total phenol and flavonoid content of black gram (Vigna mungo), cowpea (Vigna unguiculata), desi chickpea (Cicer arietinum), and yellow mustard (Brassica alba) seeds and their sprouts (48 h) were determined. The parameters selected reflect the antioxidant capacity with respect to the dietary antioxidants (β-carotene, ascorbic acid) which were noted to be highest in chickpea sprouts and black gram sprouts respectively. The highest antioxidant activity in terms of % DPPH inhibition (49.837 ± 0.61 % ) and flavonoid content ( 211.06 ± 8.17 mg/100g ) was observed in cowpea sprouts. The highest total phenol content was noted in yellow mustard sprouts (58.45 ±6.67 mg/100g). Inclusion of pulses in the diet is a healthy way to meet dietary recommendations and is associated with reduced risk of several chronic diseases including cancer. Long-term randomized controlled trials are needed to demonstrate the direct effects of pulses on the cancer like diseases.
Źródło:
World Scientific News; 2016, 35; 73-86
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ techniki suszenia konwekcyjnego na wybrane wyznaczniki jakości suszonej tkanki roślinnej
The influence of convective drying technique on chosen dried plant tissue quality determinants
Autorzy:
Witrowa-Rajchert, D.
Radecka-Wierzbicka, M.
Powiązania:
https://bibliotekanauki.pl/articles/286349.pdf
Data publikacji:
2005
Wydawca:
Polskie Towarzystwo Inżynierii Rolniczej
Tematy:
ziemniak
marchew
rehydracja
witamina C
karoten
carrot
potato
rehydration
carotene
ascorbic acid
Opis:
W pracy badano wpływ różnych sposobów doprowadzenia powietrza podczas suszenia konwekcyjnego na wybrane wskaźniki jakości suszonej marchwi i ziemniaka. Rodzaj techniki suszenia ma wpływ na przebieg procesu. Poprawienie warunków wymiany ciepła i masy, poprzez wprawienie złoża w stan fluidalny, skraca czas suszenia o ok. 30% jedynie w przypadku marchwi i przyspiesza usuwanie wody z ziemniaka w początkowej fazie procesu. Nie stwierdzono jednoznacznego wpływu techniki suszenia na zdolność materiału do rehydracji. Zastosowanie suszenia fluidalnego powoduje największe ubytki karotenów w marchwi (56%) i witaminy C w ziemniaku (51%). Techniką suszenia w największym stopniu pozwalającą zachować te związki jest metoda zapewniająca jak najmniejszy kontakt suszonego materiału z powietrzem.
The influence of different way of air feed during convective drying on chosen died carrot and potato quality determinants was investigated in this work. The process is determined by the sort of drying technique. Improvement of heat and mass exchange conditions by putting the bed in fluid state make the drying time shorter about 30%, only for carrot. It accelerates water removal from potato at the beginning of the process as well. An unique influence of drying technique on materials capacity to rehydration was not found. Application of the fluid drying causes the biggest loss of carotene in carrot (56%) and ascorbic acid in potato (51%). The drying technique what allows retaining above compounds there is a method providing lowest contact of dried materials with air.
Źródło:
Inżynieria Rolnicza; 2005, R. 9, nr 9, 9; 387-395
1429-7264
Pojawia się w:
Inżynieria Rolnicza
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The effect of a Mediterranean diet model on serum beta-carotene concentration. A preliminary assessment
Autorzy:
Witkowska, A.
Zujko, M.E.
Mironczuk-Chodakowska, I.
Powiązania:
https://bibliotekanauki.pl/articles/877138.pdf
Data publikacji:
2013
Wydawca:
Narodowy Instytut Zdrowia Publicznego. Państwowy Zakład Higieny
Tematy:
Mediterranean diet
human nutrition
diet
serum
beta-carotene
concentration
metabolic disease
prevention
Opis:
Background. Some of the main nutritional reasons for recommending a Mediterranean diet is to prevent metabolic diseases arising through free radical formation. A key constituent compound is β-carotene which, amongst the carotenoids, displays the greatest provitamin A activity as well as possessing significant antioxidant properties. Objectives. Principally, to determine the relationship between serum β-carotene levels and the effect of Mediterranean diet guidelines in a selected group of women. Materials and Methods. The subject group consisted of 26 women aged 19-22 years. A nutritional assessment was performed using 3 day repeats of 24-hour recall interviews. A 9-point aMED (alternate Mediterranean Diet) score was used to study dietary habits. Serum β-carotene was measured by liquid chromatography with photodiode array detection (HPLC-PDA). Results. β-carotene dietary intake was highly variable, ranging from 734 to 14476 μg/day (median 3022 μg/day). Serum β-carotene concentration ranged between 0.071-1.905 μmol/L (median 0.519 μmol/L) and was significantly associated with the Mediterranean Diet model (Spearman r=0.633, p<0.001). Out of the dietary sources of β-carotene, consuming carrots had the most significant impact on its serum concentration. Other dietary factors positively affecting serum β-carotene were: consumption of nuts and seeds, pulses, a favourable ratio of mono-unsaturated fatty acids to saturated fatty acids and eating fruit and wholegrain cereal products. Conclusions. Adopting a Mediterranean-based diet had a positive effect on increasing serum beta-carotene levels.
Wprowadzenie. Sposób żywienia oparty o zalecenia diety śródziemnomorskiej rekomendowany jest w celu prewencji chorób metabolicznych, w patomechanizmie których uczestniczą wolne rodniki. β-karoten jest związkiem charakteryzującym się największą spośród karotenoidów aktywnością prowitaminy A, a także wykazuje właściwości antyoksydacyjne. Cel badań. Zasadniczym celem pracy było zbadanie zależności pomiędzy stężeniem β-karotenu w surowicy krwi a stosowaniem zaleceń diety śródziemnomorskiej w wybranej grupie kobiet. Materiał i metody. W badaniach uczestniczyło 26 kobiet w wieku 19-22 lata. Dane dotyczące spożycia produktów spożywczych uzyskano przy pomocy wywiadu 24-godzinnego, który przeprowadzono 3-krotnie. Nawyki żywieniowe badanych kobiet oceniane były przy pomocy 9-punktowej skali a-MED (alternate Mediterranean Diet Score). Stężenie β-karotenu w surowicy krwi oznaczono metodą chromatografii cieczowej z detekcją fotodiodową (HPLC-PDA). Wyniki. Pobranie -karotenu z dietą przez badane kobiety charakteryzowało się dużą zmiennością i zawarte było w przedziale wartości od 734 do 14476 μg/dobę (mediana 3022 μg/dobę). Stężenie beta-karotenu w surowicy krwi badanych mieściło się w zakresie 0,071-1,905 μmol/l (mediana 0,519 μmol/l). Stężenie β-karotenu w surowicy krwi było w znaczący sposób powiązane z przyjętym modelem diety śródziemnomorskiej (R w teście Spearmana=0,633, p<0,001). Spośród żywieniowych źródeł β-karotenu wpływ na stężenie tej prowitaminy w surowicy krwi wywierało spożycie marchwi. Do innych czynników żywieniowych mających dodatni wpływ na stężenie β-karotenu w surowicy krwi należało spożycie orzechów i nasion oraz roślin strączkowych, a także korzystny stosunek kwasów tłuszczowych jednonienasyconych do nasyconych, oraz spożycie owoców i produktów zbożowych pełnoziarnistych. Wnioski. Sposób odżywiania zbliżony do śródziemnomorskiego modelu spożycia dodatnio wpływał na stężenie β-karotenu w surowicy krwi badanych kobiet.
Źródło:
Roczniki Państwowego Zakładu Higieny; 2013, 64, 2
0035-7715
Pojawia się w:
Roczniki Państwowego Zakładu Higieny
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of selected abiotic factors on the decomposition of chlorophylls
Autorzy:
Kowalewska, G.
Szymczak, M.
Powiązania:
https://bibliotekanauki.pl/articles/48301.pdf
Data publikacji:
2001
Wydawca:
Polska Akademia Nauk. Instytut Oceanologii PAN
Tematy:
chlorophyll
temperature
abiotic factor
blue-green alga
Anabaena variabilis
beta-carotene
decomposition
Opis:
The paper presents the results of experiments to determine the influence of selected physico-chemical factors – oxygen, visible light and temperature – on the decomposition of (1) chlorophylls a, b and c, chlorophyll a derivatives and β-carotene in acetone solution, and (2) chlorophyll a and β-carotene in axenic cultures of the blue-green algae Anabaena variabilis. The results indicate that both in acetone extracts and in blue-green algae cultures these pigments were most sensitive to light and oxygen; temperatures of up to 25◦C had no marked influence on these compounds. Under anoxia in acetone solution, the stability towards light decreased in the order chlorophyll a, chlorophyll b, chlorophylls c. Chlorophyll a, moreover, was less stable than its derivatives – phaeophorbides, phaeophytins, pyrophaeophytins and steryl chlorins – but more stable than β-carotene, in the last case also in the blue-green algae cultures. Decomposition of all the pigments proceeded mainly via the breakdown of the porphyrin macrocycle, since the decomposition products were not detected in the VIS range. On the basis of these experiments one can state that while light and oxygen may have a decisive direct influence on the distribution of chlorophylls and β-carotene in sediments, in the natural environment, temperatures of up to 25◦ C may have very little immediate effect.
Źródło:
Oceanologia; 2001, 43, 3; 315-328
0078-3234
Pojawia się w:
Oceanologia
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The role of well-known antioxidant vitamins in the prevention of cadmium-induced toxicity
Autorzy:
Sitek, Agnieszka
Kozłowska, Lucyna
Powiązania:
https://bibliotekanauki.pl/articles/2085759.pdf
Data publikacji:
2022-08-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
vitamin A
β-carotene
vitamin E
vitamin C
oxidative stress
cadmium exposure
Opis:
Long-term exposure to cadmium (Cd) leads to the development of a number of conditions associated with liver and kidney damage, reproductive and cardiovascular disorders, in addition to visual impairment, blindness and hearing loss, among others. Cadmium has been classified as a human carcinogen by the International Agency for Research on Cancer. The toxicity of Cd is related to its pro-oxidant properties and the associated increase in oxidative stress. Antioxidant ingredients may be helpful in preventing the adverse effects of Cd. The effect of well-known antioxidant vitamins (E, C, A and β-carotene) in the prevention of Cd-induced toxicity is presented in this study. Numerous studies in animal models have shown that the effects of vitamins: E, C, A, and β-carotene were effective in reducing Cd concentrations in organs and tissues and reduced Cd-induced changes in liver, kidney, and reproductive, circulatory, nervous, immune, and respiratory systems. In contrast, the limited number of human studies does not allow to accurately determine the role of these nutrients in reducing Cd-induced toxicity, indicating the need for further studies clarifying the role of antioxidant vitamins in reducing Cd-induced toxicity. However, it seems reasonable to promote the consumption of natural food products that are sources of antioxidant vitamins in groups of people with occupational and environmental exposure to Cd.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2022, 35, 4; 367-392
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Adverse effects of antioxidative vitamins
Autorzy:
Rutkowski, Maciej
Grzegorczyk, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/2180105.pdf
Data publikacji:
2012-06-01
Wydawca:
Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
Tematy:
vitamins A
E and C
β-carotene
supplementation
side actions
toxic effects
Opis:
High doses of synthetic antioxidative vitamins: A, E, C and β-carotene are often used on long-term basis in numerous preventive and therapeutic medical applications. Instead of expected health effects, the use of those vitamins may however lead to cases of hypervitaminosis and even to intoxication. The article points out main principles of safety which are to be observed during supplementation with antioxidative vitamins. Toxic effects resulting from erroneous administration of high doses of those substances on organs and systems of the organism are also discussed. Attention is drawn to interactions of antioxidative vitamins with concomitantly used drugs, as well as intensification of adverse effects caused by various exogenous chemical factors. Moreover, the article presents the evaluation of supplementation with these vitamins, which was performed in large studies.
Źródło:
International Journal of Occupational Medicine and Environmental Health; 2012, 25, 2; 105-121
1232-1087
1896-494X
Pojawia się w:
International Journal of Occupational Medicine and Environmental Health
Dostawca treści:
Biblioteka Nauki
Artykuł
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