Biological activity of microalgae can be enhanced by manipulating the cultivation temperature and irradiance

Gacheva, G.; Gigova, L.

doi:10.2478/s11535-014-0350-x

Cited by 14 publications

(7 citation statements)

References 103 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Long-term adaptation mechanisms often involve metabolic shifts, consisting in the production of secondary metabolites [ 53 , 163 ]. Because stress conditions such as salinity [ 254 ], nutrient deficiency, temperature and high light stress [ 255 ] are “interpreted” by the algae as “dangerous” [ 91 ], they accumulate high-energy molecules such as carotenoids and/or lipids [ 13 , 53 , 254 , 256 ]. For instance, a nitrogen or silicon depletion stress has been shown to increase oil production in diatoms by a factor of 2 or 3 of their average dry weight [ 257 , 258 , 259 ].…”

Section: Understanding Of Diatom (Stress) Biologymentioning

confidence: 99%

Diatom Milking: A Review and New Approaches

et al. 2015

View full text Add to dashboard Cite

The rise of human populations and the growth of cities contribute to the depletion of natural resources, increase their cost, and create potential climatic changes. To overcome difficulties in supplying populations and reducing the resource cost, a search for alternative pharmaceutical, nanotechnology, and energy sources has begun. Among the alternative sources, microalgae are the most promising because they use carbon dioxide (CO2) to produce biomass and/or valuable compounds. Once produced, the biomass is ordinarily harvested and processed (downstream program). Drying, grinding, and extraction steps are destructive to the microalgal biomass that then needs to be renewed. The extraction and purification processes generate organic wastes and require substantial energy inputs. Altogether, it is urgent to develop alternative downstream processes. Among the possibilities, milking invokes the concept that the extraction should not kill the algal cells. Therefore, it does not require growing the algae anew. In this review, we discuss research on milking of diatoms. The main themes are (a) development of alternative methods to extract and harvest high added value compounds; (b) design of photobioreactors; (c) biodiversity and (d) stress physiology, illustrated with original results dealing with oleaginous diatoms.

show abstract

Section: Understanding Of Diatom (Stress) Biologymentioning

confidence: 99%

Diatom Milking: A Review and New Approaches

et al. 2015

View full text Add to dashboard Cite

show abstract

“…against different types of bacteria, notably against S. aureus and S. xylosus. Furthermore, the results suggested that the harvesting period in terms of temperature and cell metabolism of the algae could play an important role in conferring the antibiotic effective against both Gram-positive and Gram-negative bacteria (Gacheva and Gigova, 2014) (Figure 8). The antibiotic activity of the ethanol extract of freshwater algae could be attributed to the presence of bioactive phenolics.…”

Section: Discussionmentioning

confidence: 99%

Antibacterial effects of the organic crude extracts of freshwater algae of Sulaymaniyah, Kurdistan Region, Iraq

Thomas¹,

Ghafour²,

Diyya³

et al. 2021

J. Med. Plants Res.

View full text Add to dashboard Cite

In the recent past, the importance of freshwater algae has grown enormously due to their antibiotic activity against certain species of bacteria known for several disease states like endocarditis, external otitis, skin rash, etc. Also, there is a growing concern among the immunocompromised individuals that they may be susceptible to antibiotics and anti-fungal resistant infections resulting in increased fatality rates. Hence, in this investigation, extraction of potentially bioactive compounds from natural resources like freshwater algae was performed along with the evaluation of the antimicrobial activities of these extracts against some opportunistic bacteria like Staphylococcus aureus, Escherichia coli, Staphylococcus xylosus and Pseudomonas aeruginosa using well diffusion method. The data showed a statistically significant (P < 0.05) antibacterial activity of the organic extracts (0.1 g/ml) obtained from freshwater algae against multi-drug resistant S. aureus and S. xylosus strains as compared to the control. Our data reinforce the importance of bioactive compounds from fresh algae as potential antimicrobial agents, and they could act as an alternative to conventional antibiotics.

show abstract

“…Under such constraints, microalgae are reported to produce a maximal amount of varied bioactives as compared to normal conditions due to the stressed altered metabolic pathways. The induction or overproduction of these bioactives is primarily a survival technique to overcome the inconsiderate growth environments [2]. It is thus, necessary to manipulate the growth conditions in order to stimulate the synthesis of commercially significant microalgal bioactives [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Gamma Irradiation on Antioxidant Potential and Bioactives of a Cosmeceutically Significant Chlorella Emersonii Kj725233

Sawant

Singh

Ghosh

et al. 2019

Int J Pharm Pharm Sci

View full text Add to dashboard Cite

Objective : Gamma radiation induces free radicals with a corresponding alteration in the cell’s antioxidant defense system. The present study thus aimed at determining the role of gamma irradiation in improving the cosmeceutical potential of CEK in terms of antioxidants. Methods : C.emersonii KJ725233 was subjected to low (100 Gy) and high (1000 Gy) gamma irradiation doses and its effect on the chlorophyll content was evaluated. The quantitative alterations in the antioxidant content of CEK were evaluated by phosphomolybdenum assay (TAC), ferric reducing antioxidant potential (FRAP), 2, 2 - Dipheny-1-picryl hydrazyl radical scavenging assay (DPPH), total phenolic (TPC) and total flavonoid content (TFC). Also, the corresponding qualitative alterations in the bioactives of CEK were determined by GC-HRMS analysis. Results : A 179.57±2.55% increase in the total chlorophyll content alongwith a 71.76±2.96%, 32.08±2.16%, 11.67±0.89%, 42.85±8.0% and 31.37±3.18% increase was observed in the TAC, FRAP, DPPH radical scavenging, TPC and TFC was observed in CEK irradiated at 1000 Gy. GC-HRMS analysis revealed the induction of Vitamin E on irradiation at both the doses with a corresponding decrease in the phytol content whereas 100 Gy stimulated the induction of phytosterols. Conclusion : The potent intrinsic antioxidant activity of cosmeceutically significant CEK can be elevated with the induction of the most sought after antioxidant in cosmetology – Vitamin E on irradiation.

show abstract

Biological activity of microalgae can be enhanced by manipulating the cultivation temperature and irradiance

Cited by 14 publications

References 103 publications

Diatom Milking: A Review and New Approaches

Diatom Milking: A Review and New Approaches

Antibacterial effects of the organic crude extracts of freshwater algae of Sulaymaniyah, Kurdistan Region, Iraq

Effect of Gamma Irradiation on Antioxidant Potential and Bioactives of a Cosmeceutically Significant Chlorella Emersonii Kj725233

Contact Info

Product

Resources

About