Correlation dependencies in carotenoid accumulation troughout life cycle of green alga Haematococcus pluvialis

In this study, there has been determined correlation between ABTS values and content of carotenoids, as major components in the ethanolic extracts from green alga Haematococcus pluvialis biomass collected throughout life cycle

Stability of some vegetable oils supplemented with astaxanthin as antioxidant

Microalgae-derived antioxidants are starting to gain popularity in the processing of functional and organic foods. Astaxanthin (AXT) is included in the list of these antioxidants. The antioxidant potential of AXT allows food technologists to offer a wide range of functional foods. The study revealed the antioxidant potential of AXT and its ability to stop the oxidation of vegetable oils under high temperature conditions. In conclusion, astaxanthin is a potent antioxidant for thermal protection of vegetable oils

The role of carotenoids in suppression of oxigen reactive species in red alga Porphiridium Cruentum

Reaction of any living organisms, including the unicellular in case of xenobiotic interventions and life conditions modification is expressed in modifying of antioxidant status, which tends to maintain homeostasis and elimination of induced oxidative stress status. Antioxidant components of the living cell are the first who react to any changes, so it is possible to determine the early changes in normal reaction and requires the further development of events that will take place. In the experiments with oxidative stress, microalga Porphyridium cruentum was grown in conditions of cultural medium supply with compounds of Fe (III) with the Schiff base and dioximes, in concentration of 20 mg / l. The production of biomass for the majority of samples was under the blank limit with 20-40%

Activitatea antioxidantă a Haematococcus pluvialis la diferite etape ale ciclului vital în prezenţa compuşilor coordinativi ai Co cu bazele Schiff

Sunt expuse rezultatele şi analiza modificării nivelului de productivitate şi activitate antioxidantă a microalgei verzi Haematococcus pluvialis la diferite etape ale ciclului vital la acţiunea unor compuşi coordinativi ai Co cu bazele Schiff. Fiecare etapă de creştere şi dezvoltare a hematococului are specificul său al activităţii biosintetice, şi respective formează un răspuns individual la acţiunea compuşilor coordinativi introduşi în mediul de cultivare. Acest răspuns individual este determinat de productivitatea microalgală, conţinutul de carotenoizi, precum şi de activitatea antioxidantă a extractelor etanolice specifice tipului corespunzător de biomasă

Silver Nanoparticles as Stimulators in Biotechnology of Porphyridium Cruentum

Only AbstractSilver nanoparticles (AgNPs) are one of the most actively used nanomaterials. Therefore, their release into the environment becomes inevitable. Consequently, studies regarding the harmful effects of AgNPs towards organisms are very common. In the process of investigating the effects of silver nanoparticles on living cells, other effects besides the toxic ones were revealed. Thus, different nanoparticles can stimulate biosynthetic processes, which will significantly expand their application in biotechnology. The aim of this paper was to elucidate the possibility of using small silver nanoparticles (10-20 nm) stabilized with polyethylene glycol and citrate as stimulators in the biotechnology of microalga Porphyridium cruentum. This red microalga is recognized as a producer of polysaccharides, proteins, polyunsaturated fatty acids. Silver nanoparticles stabilized with polyethylene glycol of 12 nm in size, as well as nanoparticles stabilized with citrate of 10 and 20 nm in size, were used in concentrations ranging from 0.01 to 1.0 μM. Concentrations were determined for each type of particles, where an increased accumulation of polysaccharides and proteins was observed in Porphyridium cruentum biomass. Moreover, the lack of toxicity of these nanoparticles was confirmed by maintaining a high level of productivity

Influence of gold and silver nanoparticles on the synthesis of phycobiliproteins in red microalga Porphyridium cruentum

The scientific results were obtained within the project 20.80009.5007.05 „Biofunctionalized metal nanoparticles - obtaining using cyanobacteria and microalgae” funded by NARD, Republic of Moldova.The biological properties of nanoparticles are determined by their size, shape, and surface characteristics. The study of the effect of nanoparticles on microalgae as biotechnological objects is one of the topical areas of modern research. Similar to the action of complex chemical compounds, the stimulating nature of the action of nanoparticles is based on reversible oxidative stress caused by the mechanisms of adaptation of a microalgae culture to cultivation conditions. Phycobiliprotein pigments, as the major light- harvesting pigments of red microalga Porphyridium cruentum, are involved in the cellular response to the presence of nanoparticles in the cultivation medium

Sulfated polysaccharides as agents for free radicals annihilation in spirulina biomass cultivated under the induced illumination stress conditions

Spirulina platensis is the source of sulfated polysaccharides known as Na (Ca) spirulan with antiviral and anti-inflammatory action. In the cell sulfated polysaccharides as polyanionic complexes located on the external membrane surface, perform intercellular connections playing the role of tissue barriers, cell adhesion, protection against pathogens and serve as well as reservoir of growth factors. It was demonstrated the involvement of sulfated polysaccharides in the annihilation of hydroxyl radicals and peroxide formed as a result of the Fenton reaction, and indirectly in the lipid protection against oxidation

Procedures for obtaining cyanobacterial and microalgal biomass – source of multifunctional remedies

Patents No.: MD 130Y; MD 4542; MD 4543; MD Patent application No. 4598Field of study: Medicine and human factors. Pharmacy and cosmetics. Food bio – securityThe procedures refer to biotechnology and bionanotechnology in particular to processes for biomass production and cultivation of cyanobacterium Spirulina platensis and microalga Dunaliella salina - sources of multifunctional remedies

Red Algae <I>Porphyridium cruentum</I> Growth Stimulated by CdSe Quantum Dots Covered with Thioglycerol

Acces full text - https://doi.org/10.1166/jno.2012.1416CdSe nanoparticles were synthesized using colloidal methods. In order to obtain hydric colloidal solution, the surface of the quantum dots has been modified with thioglycerol. The presence of thioglycerol on the CdSe quantum dots was confirmed by infrared spectroscopy. The hydric solution of CdSe was used in biological tests. The red algae Porphyridium cruentum was investigated as biological object. Quantum dots were added in the microalgae cultivation medium in a quantity of 1–10 mg/l. Quantities of 4–8 mg/l have shown a stimulating effect, i.e., increasing the amount of accumulated biomass to 18, 2–47% in comparison with the control sample. The absence of toxic effects of CdSe quantum dots was indicated by the determination test of the malonic dialdehyde that manifested the lack of membrane lipoprotein oxidation. A new area of application of CdSe nanoparticles was defined, namely that of phycobiotechnology

Влияние окислительного стресса на антиоксидантную активность и биохимический состав биомассы спирулины

Studiul de faţă a fost efectuat in scopul evidenţierii acţiunii stresului oxidativ indus asupra activităţii antioxidante şi conţinutului de componente funcţionale (proteine, β-caroten, fi cobiline, fenoli) din biomasa cianobacteriei Spirulina platensis. Pentru inducerea stresului oxidativ au fost utilizaţi compuşii coordinativi ai cobaltului cu bazele Schiff. Conform rezultatelor obţinute, stresul oxidativ indus la spirulină este asociat cu diminuarea activităţii antioxidante si a componentelor principale din biomasă.The present study was carried out to evaluate the effect of oxidative stress on the composition and antioxidant activity of Spirulina platensis biomass. The oxidative stress was induced by Co(II) Schiff base coordination compounds. The results of the study indicate that the oxidative stress induces the diminution of protein, phycobilin, β-carotene and phenolic content of spirulina biomass and its antioxidant activity.Статья посвещена изучению влияния окислительного стресса на антиоксидантную активность и биохимический состав биомассы цианобактерии Spirulina platensis. Для индукции окислительного стресса использовались координационные соединения Со(II) с основаниями Шиффа. Согласно результатам исследований, в условиях окислительного стресса наблюдается значительное сокращение антиоксидантной активности и синтеза белков, β - каротина, фикобилинов и фенольных компонентов в биомассе спирулины