β-carotene involving in free radicals annihilation in spirulina biomass cultivated under the oxidative stress conditions
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RUDIC, Valeriu; RUDI, Ludmila; CHIRIAC, Tatiana; CEPOI, Liliana; MISCU, Vera; CODREANU, Svetlana; DJUR (MAXACOVA), Svetlana; VALUŢĂ, Ana; IAŢCO, Iulia; CHELMENCIUC, Viorica; DONI, Veronica; ROTARU, Mihaela. β-carotene involving in free radicals annihilation in spirulina biomass cultivated under the oxidative stress conditions. In: Microbial Biotechnology. Ediția 3, 12-13 octombrie 2016, Chișinău. Chișinău, Republica Moldova: Institutul de Microbiologie şi Biotehnologie, 2016, p. 184.
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Microbial Biotechnology
Ediția 3, 2016
Conferința "Microbial Biotechnology"
Chișinău, Moldova, 12-13 octombrie 2016

β-carotene involving in free radicals annihilation in spirulina biomass cultivated under the oxidative stress conditions


Pag. 184-184

Rudic Valeriu, Rudi Ludmila, Chiriac Tatiana, Cepoi Liliana, Miscu Vera, Codreanu Svetlana, Djur (Maxacova) Svetlana, Valuţă Ana, Iaţco Iulia, Chelmenciuc Viorica, Doni Veronica, Rotaru Mihaela
 
Institutul de Microbiologie şi Biotehnologie al AŞM
 
Disponibil în IBN: 15 martie 2019



Teza

Carotenoids are a group of pigments that play multiple structural and functional roles. They are molecules with conjugated double bonds, allowing them to participate in photosynthetic functions. The most abundant carotenoids in cyanobacteria are β-carotene, essential component of cytoplasmic and thylakoid membranes. As photosynthetic pigments, β-carotene has a protective role of trapping the singlet oxygen in thylakoid membranes. The stress-induced light experiences during Spirulina platensis cultivation showed carotene involvement to maintain membrane function. Cell membrane integrity was determined by modifying the values of the assay of the thiobarbituric acid-reactive products in Spirulina biomass cultivated under light stress that was induced by shortening the duration of light from 24 to 4 hours during 4 days of the 10 days cultivation cycle. The correlation coefficient r = 0.7 indicates a strong negative correlation between carotene content and malonyl dialdehyde (MDA) values in spirulina biomass grown under light stress (Figure 1). Fig.1 The correlation between carotene content (abs) and MDA values (abs) in spirulina biomass cultivated under light stress (A) and standard conditions (B), during the cultivation cycle The correlation between carotene content and malonyl dialdehyde (MDA) values in spirulina biomass, grown under standard conditions of a continuous illumination, indicates no dependence between the process of carotene synthesis and accumulation of fatty acid free radicals that is considered an indirect indicator of radical accumulation process. The coefficient r = 0.4 indicates a very weak correlation. Therefore, the assumption of carotene involvement in the processes of radical annihilation was confirmed by the lack of correlation between carotene content and MDA values of spirulina biomass obtained under the optimal conditions.