Energy, Bioeconomy, Climate Changes and Environment Nexus

Blumberga, Dagnija; Chen, Bin; Ozarska, Alise; Indzere, Zane; Lauka, Dace

doi:10.2478/rtuect-2019-0102

Cited by 17 publications

(11 citation statements)

References 28 publications

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“…The increasing demand for natural ingredients for the food, feed, nutraceutical, and other industries has led to broader utilization of micro- and macroalgae as natural sources of valuable bioactive compounds. Nowadays, biotechonomy includes different biomass valorisation processes to prepare value-added products [ 1 , 2 , 3 ]. Especially, marine macroalgae is a good alternative to replace terrestrial biomass because it does not compete with plants for uses as food and (or) in feed preparation, and it does not require special resources to accumulate biomass [ 4 ].…”

Section: Introductionmentioning

confidence: 99%

Characterization of Macro- and Microalgae Extracts Bioactive Compounds and Micro- and Macroelements Transition from Algae to Extract

Tolpežnikaitė

Bartkevičs

Ružauskas

et al. 2021

Foods

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The aim of this study was to evaluate the characteristics of macroalgae (Cladophora rupestris, Furcellaria lumbricalis, Ulva intestinalis) and microalgae (Arthrospira platensis (Sp1, Sp2), Chlorella vulgaris) extracts, including micro- and macroelement transition to extract, antioxidant, antimicrobial properties, the concentrations of chlorophyll (-a, -b), and the total carotenoid concentration (TCC). In macroalgae, the highest TCC and chlorophyll content were found in C. rupestris. In microalgae, the TCC was 10.1-times higher in C. vulgaris than in Sp1, Sp2; however, the chlorophyll contents in C. vulgaris samples were lower. A moderate negative correlation was found between the chlorophyll-a and TCC contents (r = −0.4644). In macroalgae extract samples, C. rupestris and F. lumbricalis showed the highest total phenolic compound content (TPCC). DPPH antioxidant activity and TPCC in microalgae was related to the TCC (r = 0.6191, r = 0.6439, respectively). Sp2 extracts inhibited Staphylococcus haemolyticus; C. rupestris, F. lumbricalis, U. intestinalis, and Sp2 extracts inhibited Bacillus subtilis; and U. intestinalis extracts inhibited Streptococcus mutans strains. This study showed that extraction is a suitable technology for toxic metal decontamination in algae; however, some of the desirable microelements are reduced during the extraction, and only the final products, could be applied in food, feed, and others.

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Section: Introductionmentioning

confidence: 99%

Characterization of Macro- and Microalgae Extracts Bioactive Compounds and Micro- and Macroelements Transition from Algae to Extract

Tolpežnikaitė

Bartkevičs

Ružauskas

et al. 2021

Foods

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“…Owing to increasing concern of global climate-change, clean air, fresh water, reuse of waste material etc. attract a great deal of attention from the scientists of various fields [1], [3]. Clean fresh water for humans is one of the key resources which is widely used both at small domestic and at large industrial (including agriculture sector) scales.…”

Section: Introductionmentioning

confidence: 99%

Potential and Risk of the Visible Light Assisted Photocatalytical Treatment of PRD1 and T4 Bacteriophage Mixtures

Sakalauskaitė

Kuliešienė

Galalyte

et al. 2020

Environmental and Climate Technologies

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In current study UV light and visible light activated photocatalytic inactivation treatment was applied to the less commonly studied subjects, namely bacteriophages PRD1, T4 and their mixture. By using UV light irradiation and high efficiency P25 TiO2 photocatalyst powders it was demonstrated that individually and in mixture PRD1 bacteriophage is particularly vulnerable to the photocatalytic inactivation and in just approximately 20 min its infectivity is reduced by 100 %. As for the T4 bacteriophage, it has been reported that under UV irradiation T4 triggers self-repair and replication mechanisms therefore under same photocatalytic inactivation conditions infectivity reduction reaches just 60 %. Surprisingly, by studying visible light photocatalytic treatment efficiency of PRD1 and T4 bacteriophage mixture we identified that T4 bacteriophage potentially triggers the same self-repair and replication mechanism as it does under UV light. Moreover, by using two different types of visible light activated photocatalysts we determined that when efficiency of the used photocatalyst is too small the overall infectivity of the T4 bacteriophage can significantly surpass the corresponding property of the untreated control group.

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“…Global warming, which causes climate change, a highly discussed topic over the last few decades, has been attributed to CO2 emissions from the use of fossil fuels [1], [2]. Thus, alternative sources of clean energy technology are becoming ever more vital [3].…”

Section: Introductionmentioning

confidence: 99%

Effect of Combining Different Substrates and Inoculum Sources on Bioelectricity Generation and COD Removal in a Two-Chambered Microbial FuelCell: A Preliminary Investigation

Marks

Kirkel

Sekoai

et al. 2020

Environmental and Climate Technologies

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In recent years, fuel cells have become a renewable source of energy. Among different kinds of fuel cells, microbial fuel cells, which convert organic substrates to electricity by electrogenic bacteria have attracted most attention. In this study, which is preliminary in nature, potential of electricity generation and chemical oxygen demand (COD) removal were studied in a two-chamber microbial fuel cell (MFC) reactor. Effect of type of feedstock and inoculum source on bioelectricity generation and COD removal was studied as well. Brewery wastewater and potato waste were used as substrates while anaerobic sludge and cow dung were used as inoculum sources. The substrate and inoculum sources were in 8.2:1 ratio and a phosphate buffer was added to the anode compartment to regulate the pH. The system was operated at 30 °C and a home-made membrane served as a bridge between the electrodes. A maximum voltage of 3.6 mV was generated from the brewery wastewater sludge and the maximum COD removal after 3 days was 43.7 %. It was further found that the use of animal dung as inoculum source outperformed the use of sludge as regard the bioelectricity generation but not for COD removal. Similarly, the use of the brewery waste as an organic substrate outperformed the use of potato waste as regard the bioelectricity generation but not for COD removal. All experiments yielded a measurable voltage, however, the unsteady behaviour of the voltage output made it difficult to compare substrates in terms of their viability as organic fuel. Therefore, future studies should consider conducting substrate physico-chemical analysis and genomic analysis of the inoculum sources to understand their composition.

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Energy, Bioeconomy, Climate Changes and Environment Nexus

Cited by 17 publications

References 28 publications

Characterization of Macro- and Microalgae Extracts Bioactive Compounds and Micro- and Macroelements Transition from Algae to Extract

Characterization of Macro- and Microalgae Extracts Bioactive Compounds and Micro- and Macroelements Transition from Algae to Extract

Potential and Risk of the Visible Light Assisted Photocatalytical Treatment of PRD1 and T4 Bacteriophage Mixtures

Effect of Combining Different Substrates and Inoculum Sources on Bioelectricity Generation and COD Removal in a Two-Chambered Microbial FuelCell: A Preliminary Investigation

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