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1

Efficiency of selected mutagens in generating Xanthophyllomyces dendrorhous strains hyperproducing astaxanthin

100%
Stachowiak B.
Polish Journal of Microbiology
|
2013
|
tom 62
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nr 1
Astaxanthin is a xanthophill pigment with commercial application in the aquaculture, pharmaceutical, food and cosmetic industries. The red yeast Xanthophyllomyces dendrorhous is one of the most promising microorganisms for its industrial production. However, astaxanthin content in wild yeast strains is low. Pigment production by X. dendrorhous can be improved by mutagenesis. The aim of the study was to assess the efficiency of four mutagens: UV radiation, benomyl, ethyl methanesulfonate and ethidium bromide in generating asthaxanthinhyperproducing strains of the yeast Xanthophyllomyces dendrorhous DSM 5626. Mutations with benomyl, ethidium bromide and UV radiation generated a group of hyperpigmented mutants exhibiting increases up to 100% in astaxanthin content. Ethyl methanesulfonate turned out to be useless in this respect.
2

Carotenoprotein complexes from hydrocorals

84%
Czeczuga B., Florez G. L., Chomutowska H., Czeczuga-Semeniuk E.
Folia Biologica
|
1999
|
tom 47
|
nr 1-2
3
Content available remote

Effect of carotenoids on in vitro proliferation and differentiation of oval cells during neoplastic and non-neoplastic liver injuries in rats

84%
Wojcik M., Bobowiec R., Martelli F.
Journal of Physiology and Pharmacology. Supplement
|
2008
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tom 59
|
nr 2
The goal of this study was to investigate the effects of ß-caroten and astaxanthin (ASX) - carotenoid without provitamin A activity on the proliferation and differentiation of rat oval cells (OC) in vitro. Oval cells were isolated from two groups of animals: I - partial hepatectomised (PH) and II- diethylnitrosamine (DEN) treated rats. At various time points cell lysates were separated by PAGE. For immunodetection primary antibodies against CD-34, Ck19 and albumin were used. Medium concentration of fibrinogen and haptoglobin was measured. Mitochondrial competence of cells was expressed as the proliferation index. In comparison to HP- and DEN-obtained oval cells cultured without carotenoids, the addition of ß-caroten and ASX increased albumin expression during the experimental period. The same condition didn't reveal CK19 expression. CD34 expressed by oval cells was detected up to the 5th week of ß-caroten and ASX absence in the medium. ß-carotene addition resulted in a decrease of the proliferative activity of OC, with significant changes in 48h, the 5th and 15th week of incubation. ASX (p 0.05) inhibited the proliferation, especially in 24h and 5th week of cell culture. In respect to haptoglobin concentration, its maximum value after the 10th week was observed. The fibrinogen level obtained from DEN-oval cells incubated with ß-caroten elevated from 480±6.87 µg/ml after 24h to 5520±34,56 µg/ml after the 15th week. In a condition without carotenoids fibrinogen concentration did not exceed 2280±31.5 µg/ml after the 15th week of cell culture.
4
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Astaxanthin, canthaxanthin and astaxanthin esters in the copepod Acartia bifilosa (Copepoda, Calanoida) during ontogenetic development

67%
Lotocka M., Styczynska-Jurewicz E.
Oceanologia
|
2001
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tom 43
|
nr 4
The contents of astaxanthin, canthaxanthin and astaxanthin esters were studied in natural populations of the copepod Acartia bifilosa from the Pomeranian Bay and Gulf of Gdańsk in the southern Baltic Sea. Samples dominated by any one of three developmental groups: (1) nauplii, (2) copepodids I–III and (3) copepodids IV–V and adults of Acartia bifilosa were analysed by means of high performance liquid chromatography (HPLC). As ontogenetic development progressed, significant changes occurred in the proportion of particular pigments in the total pigment pool of the various developmental groups. Astaxanthin and canthaxanthin occurred in all the groups, the former being clearly dominant. However, an increasing percentage of astaxanthin esters was recorded in the copepodids I–III, and even more in the copepodids IV–V and adults group. Most probably, astaxanthin is the main pigment active in copepod lipid metabolism. Carotenoid pigments in copepods very likely act as efficient free-electron quenchers and may be involved as antioxidants in rapid lipid metabolism. The exogenously feeding stages (late nauplii and copepodids) transform plant carotenoids taken from food and are evidently capable of metabolising astaxanthin by esterification and further degradation. It is emphasised that, according to literature data, astaxanthin esters may have an even higher quenching ability. It is suggested that crustacean carotenoid pigments, with their electron donor-acceptor abilities, may replace oxygen in peroxidation processes connected with lipid metabolism. The consequences of such a physiological role of astaxanthin for present-day estimations of energy balances in zooplankton communities are mentioned.
5

Crustacyanins in two species of shrimp from the Baltic Sea

67%
Czeczuga B.
Folia Biologica
|
1997
|
tom 45
|
nr 1-2
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