Algal Research-Biomass Biofuels and Bioproducts最新文献

英文中文

Unraveling the cellular response and detoxification efficiency of microalgal systems to naphthalene contamination in water 揭示微藻系统对水中萘污染的细胞反应和解毒效率

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103850

Mengying Wang , Han Wang , Lingyun Rong , Qi Yang , Zhilin Yang

Polycyclic aromatic hydrocarbons (PAHs) contamination in water resources is a significant environmental issue due to its widespread presence and harmful effects on aquatic ecosystems and human health. Although microalgae offer a cost-effective and eco-friendly approach for PAH remediation, their use in this context has been less explored and presents technical challenges. This study focuses on the removal of naphthalene (NAP) from water using Selenastrum capricornutum. The relationship between biomass, photosynthetic activity, oxidative damage, removal rate, and degradation products was analyzed. Results showed that at a NAP concentration of 2.5 mg/L, Selenastrum capricornutum not only exhibited enhanced growth, with increased biomass and photosynthetic pigment content compared to the control group, but also achieved a 80.0 % total removal of NAP after 4 days. However, NAP concentrations between 10.0 and 20.0 mg/L inhibited microalgal growth, with inhibition rates of 14.5 % to 33.8 % after 8 days. The degradation experiments revealed that the removal of NAP by microalgae was mainly through biodegradation and partial adsorption, and the best removal effect was achieved at the appropriate concentration (5.0 mg/L), with the removal rate as high as 88.3 %. The microalgae's growth was notably enhanced during the exponential phase, suggesting that NAP by-products are of low or non-toxicity. The degradation rate constants (k) ranged from 0.03 h⁻¹ to 0.06 h⁻¹, with half-lives (t₁/₂) between 13.19 and 18.75 h. LC-MS analysis confirmed that the by-products of NAP metabolism by microalgae are low or non-toxic. This study demonstrates that Selenastrum capricornutum is highly tolerant to NAP and effective in removing trace amounts of NAP from contaminated wastewater, highlighting its potential for PAH remediation using algae.

水资源中的多环芳烃（PAHs）污染是一个重大的环境问题，因为它广泛存在并对水生生态系统和人类健康造成有害影响。尽管微藻为多环芳烃的修复提供了一种具有成本效益和生态友好型的方法，但在这方面的应用探索较少，且存在技术挑战。本研究的重点是利用毛角硒藻去除水中的萘。研究分析了生物量、光合作用活性、氧化损伤、去除率和降解产物之间的关系。结果表明，当 NAP 浓度为 2.5 mg/L 时，与对照组相比，毛角硒藻不仅生长速度加快，生物量和光合色素含量增加，而且 4 天后 NAP 的总去除率达到 80.0%。然而，浓度在 10.0 至 20.0 毫克/升之间的 NAP 会抑制微藻的生长，8 天后抑制率为 14.5% 至 33.8%。降解实验表明，微藻对 NAP 的去除主要是通过生物降解和部分吸附，在合适的浓度（5.0 mg/L）下去除效果最好，去除率高达 88.3%。在指数期，微藻的生长速度明显加快，这表明 NAP 副产品的毒性较低或无毒。降解速率常数（k）从 0.03 h-1 到 0.06 h-1 不等，半衰期（t₁/₂）在 13.19 到 18.75 h 之间。这项研究表明，毛角硒藻对 NAP 有很强的耐受性，能有效去除受污染废水中的痕量 NAP，突出了利用藻类修复多环芳烃的潜力。

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引用次数: 0

Recyclable CO2/DES-enabled microalgae efficient pretreatment and in-situ transesterification for biodiesel production from all component 可回收 CO2/DES 微型藻类高效预处理和原位酯交换，利用所有成分生产生物柴油

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103856

Hangyu Luo , Zhuangzhuang Zhang , Zhengfei Pei , Jinyu Tan , Jinshu Huang , Junfa Yuan , Jiasheng Chen , Pan Meng , Xiaofang Liu , Hu Li

Conventional microalgae biodiesel production requires more solvents and energy due to cell wall stubbornness and process complexity. This study synthesized a functional deep eutectic solvent (fDES) for microalgae pretreatment and in-situ transesterification. Because of its pretreatment and transesterification activity, fDES can be used for pretreatment, oil extraction, and transesterification catalysis, obtaining 98.9 % yield of biodiesel. Injecting and releasing CO₂ can switch the polarity of DES to separate biodiesel and recover fDES components, enhancing process efficiency and sustainability of biodiesel production. The chemical interaction process shown by the pseudo-second-order kinetic model of adsorption and desorption further proves the process of CO₂ regulating the polarity of fDES. The remaining microalgae components were transformed into yeast lipids with 3.3 g/L for biodiesel by enzymolysis and continuous fermentation. Overall, this strategy of integrating pretreatment, production, separation, and solvent recovery to funnel all components of microalgae into biodiesel provides an efficient solution for biomass valorization.

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引用次数: 0

Intra-colony light regulates morphology diversity of colonial cyanobacteria 群落内光照调节蓝藻群落的形态多样性

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103829

Zhipeng Duan , Ganyu Feng , Xiao Tan , Rui Zhu

Morphological diversity widely exists in colonial cyanobacteria, which poses a challenge to monitor and predict population dynamics. Light-induced adaptation plays a key role in the underlying mechanisms. Here, to demonstrate how morphological parameters adapt to physiological features (such as pigments and gas vesicles) under light limitation, a model of intra-colony light regimes (ICLR) was developed based on the colonies of Microcystis Kützing. that caused cyanobacterial harmful blooms worldwide. Cell pigments and gas vesicles positively regulated cellular light attenuation coefficient (D(λ)cell), and both accounted for the D(λ)cell variation of 68.2 % and 30.1 %, respectively. According to the ICLR model, D(λ)cell negatively correlated with colony thickness, and a positive relationship existed between colony thickness and cell-to-cell distance (an indicator of colony compactness). Therefore, increasing cell-to-cell distance is an effective strategy when the D(λ)cell is high or colonies are light-limiting, facilitating the formation of loose, large colonies. This pattern was also observed in Microcystis populations in eutrophic Lake Taihu (China) and cyanobacterial Nostoc sphaeroides Kützing, showing cell-to-cell distance positively related to colony thickness or colony depth. This suggests that the predicted morphological adaptation patterns based on the ICLR model are more general in colony-forming cyanobacteria. These findings provide new insights into the morphology diversity of colonial cyanobacteria toward changing environments.

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引用次数: 0

Microalgae strain separation using electrophoresis

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103843

Maryam Davardoostmanesh, Hossein Ahmadzadeh, Soheila Samiee

The aim of this study is to demonstrate the potential application of electrophoresis for separation of microalgae to select single cells of microalgae for the development of pure cultures of the desired strain. A mixed culture of Chlorella vulgaris and Scenedesmus sp. was used in this study. A serial arrangement of mega-bore capillary tubes was designed to separate Chlorella vulgaris from Scenedesmus using different parameters such as size, charge, and morphologies under an electric field in very short time (30 min). The mixture of both species was successfully separated into several fractions with high resolution. Chlorella vulgaris was separated from Scenedesmus with 94 % purity. The characterization techniques were applied on each fraction to identify algae species and their properties. Finally, cell viability was examined after separation by reculturing the last separated fraction. This work presents a simple, fast, and effective method for microalgae separation with potential application at large scales.

引用次数: 0

Corrigendum to “Instant Controlled Pressure Drop (DIC) as an innovative pretreatment for extraction of natural compounds from the brown seaweed Sargassum muticum (Yendo) Fenshott 1955 (Ochrophytina, Fucales)” [Algal Res. 83 (2024) 103705]

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103813

H. Pliego-Cortés , V. Boy , N. Bourgougnon , J.-L. Lanoisellé

引用次数: 0

The impact of sulphated polysaccharides from Ecklonia maxima on carbohydrate hydrolyzing enzymes, muscle glucose uptake and intestinal glucose absorption ex vivo

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103831

Leah R. Pillay , Tosin A. Olasehinde , Kolawole Olofinsan , Almahi I. Mohamed , Md. Shahidul Islam , Anthony I. Okoh , Ademola O. Olaniran

Ecklonia maxima is a rich source of bioactive compounds and has been shown to exhibit several biological activities. However, the antidiabetic potential of sulphated polysaccharide (SP) from E. maxima is yet to be fully explored. This study characterised crude and purified SPs from E. maxima using Fourier-transform infrared Spectroscopy, Ultra Performance liquid chromatography-diode array detector (UPLC-DAD) and Nuclear magnetic resonance spectroscopy. The antidiabetic potential of the SPs was assessed via their effect on carbohydrate hydrolysing enzymes (α-amylase and α-glucosidase), glucose uptake in psoas muscles and intestinal glucose absorption ex vivo. The SPs revealed the presence of glucose, galactose, xylose and galacturonic acid. The crude and purified SPs exhibited strong inhibitory effects on α-amylase and α-glucosidase activity. The SPs significantly increased glucose uptake into yeast cells and psoas muscles. The crude and purified SPs significantly reduced intestinal glucose absorption compared to metformin. The SPs displayed notable potential for glucose uptake in yeast cells and psoas muscle and inhibition of glucose absorption in small intestine. The antidiabetic mechanisms of the SPs could be linked to inhibition of α-amylase and α-glucosidase, reduction of intestinal glucose absorption and increase in glucose uptake into the muscles. SPs from E. maxima exhibit strong antidiabetic potentials and can be explored for the management of type-2 diabetes.

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引用次数: 0

An insight into the potential antioxidant, anticancer and antimicrobial activities of Geitlerinema sp. C-phycocyanin extracts

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103836

Sona Hajiyeva , Meral Yılmaz Cankilic , Volkan Kilic , Sennur Gorgulu , Francesca Patrignani , Rosalba Lanciotti

C-phycocyanin derived from cyanobacteria has recently attracted significant research attention due to its diverse bioactive compounds. The current research investigated the antioxidant and antimicrobial properties of lyophilized extracts from Geitlerinema sp., which exhibited partial purity (A₆₂₀/A₂₈₀ = 2.78) in vitro. Additionally, we explored the anticancer effects of the C-phycocyanin extract of analytical grade (A₆₂₀/A₂₈₀ = 4.12) which is purified through ion exchange chromatography.

We found an IC₅₀ value of 0.57 ± 0.01 mg/mL for C-phycocyanin, close to that of ascorbic acid (0.49 ± 0.08 mg/mL), suggesting its potential to be used as a specific antioxidant source. MTT assays on lung (A549, CCD-19Lu) and pancreas (Panc-1, hTERT-HPNE) cell lines provided IC₅₀ values which is lower for CCD-19Lu cells when compared to A529 cells and which is higher in Panc-1 cells when compared to hTERT-HPNE. As a result, the tested compound exhibited a favourable safety profile, with enhanced effectiveness at lower concentrations and significant anticancer activities against pancreatic cells after 72 h. Moreover, the compound was found to be effective antimicrobial action against both Gram-negative/Gram-positive bacteria and yeast. The results emphasize the promising bioactivity of C-phycocyanin in antimicrobial, antioxidant, and anticancer research.

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引用次数: 0

From biogas to biomethane: Evaluating the role of microalgae in sustainable energy production – A review

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103835

Bendix Wojaczek , Elena Singer , Vivekanand Vivekanand , Christoph Lindenberger

Methane, predominantly derived from fossil resources, is a highly utilised energy source due to its high energy density. However, the rapid consumption of fossil fuels has precipitated anthropogenic climate change and resource depletion, compelling the necessity for a transition towards sustainable and climate-compatible energy sources. This review examines biogas upgrading technologies, encompassing physical, chemical, and biological methods, with a particular focus on photosynthetic CO₂ fixation to enhance methane purity and meet biomethane purity standards. Biological processes, in particular those utilising microalgae, demonstrate considerable potential for CO₂ sequestration and have the capacity to reduce emissions while simultaneously generating valuable byproducts. The review investigates key process parameters, including pH, liquid-to-gas (L/G) ratio, temperature, and gas retention time (GRT), along with the removal efficiency of CO₂. The mass transfer of CO₂ and the role of microorganisms are also examined. Furthermore, biological, and chemical/physical upgrading technologies are economically and ecologically compared.

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引用次数: 0

Effects of addition of algae biomass on the structure, bioactivity and nutritional properties of Halloumi-like cheese

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103874

Héctor Hernández , Remi Le Romancer , Maria Cristiana Nunes , Catarina Prista , Anabela Raymundo

The incorporation of microalgal biomass into milk products has gained as a way to create more sustainable and nutritionally enhanced fermented products. This study aimed to assess how adding algae (specifically Chlorella vulgaris and a blend of C. vulgaris, Fucus vesiculosus, and Ulva rigida) influences the rheological behavior (Small Amplitude Oscillatory Shear - SAOS), nutritional value, and bioactivity of Halloumi-like cheese. Since it is usually consumed grilled, frequency sweep tests at 20 °C and temperature sweeps from 20 °C to 90 °C were conducted. The results showed that the addition of microalgae at levels ranging from 1 % to 5 % w/w noticeably affected the cheese's rheological properties. Texture analysis of the cheeses carried out using a puncture test evidenced a decrease in hardness as algae content increased. Nutritional composition (namely moisture, protein, and ash) was significantly (p < 0.05) influenced by the inclusion of different concentrations of algal biomass. A 5 % Chlorella-enriched cheese showed a 40.5 % rise in ash-in-dry-matter (with notable increases in sodium (Na), manganese (Mn) and iron (Fe)) and a 10.6 % rise in protein-in-dry-matter compared to the control sample. In terms of bioactivity, the results showed an increased antioxidant capacity (ferric ion reducing antioxidant power - FRAP assay) and higher levels of total phenolic compounds (Folin-Ciocalteu technique), especially in treatments supplemented with 3 % and 5 % C. vulgaris (p < 0.05). Sensory evaluation of Halloumi-like cheeses indicated that panelists preferred the control and 1 % Chlorella-enriched cheese, both scoring an overall acceptability of 4.2 on a 1–5 scale. Moreover, 53 % and 30 % of the panel members indicated they “would probably buy” the cheese fortified with 1 and 3 % C. vulgaris, respectively, suggesting potential customers appeal for these innovative cheeses combining both animal and plant-based ingredients.

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引用次数: 0

The dominant marine Synechococcus clade II exhibits a non-canonical transcriptional response to cope with thermal stress 海洋中占主导地位的 Synechococcus II 支系表现出应对热应力的非规范转录反应

IF 4.6 2区生物学 Q1 BIOTECHNOLOGY & APPLIED MICROBIOLOGY

Algal Research-Biomass Biofuels and Bioproducts

Pub Date : 2025-01-01 DOI: 10.1016/j.algal.2024.103840

Isabel Escribano-Gómez , Raquel Liébana , Antonio S. Palacio , Abbrar Labban , Xosé Anxelu G. Morán , Ángel López-Urrutia , Laura Alonso-Sáez

Temperature significantly impacts the growth and distribution of marine cyanobacteria, which employ diverse strategies to cope with temperature variations. However, the molecular mechanisms underlying thermal acclimation in cyanobacterial taxa that dominate vast oligotrophic regions of the ocean, such as the Synechococcus clade II, remain unknown. Here, we analysed the physiological and global transcriptional response of an ecologically relevant clade II strain (Synechococcus sp. RS9907) to long-term thermal acclimation at temperatures from 20 to 33 °C. The growth rate in RS9907 increased linearly with temperature up to the warm threshold (33 °C), but genes related with the heat-shock response were upregulated within the range of 28 to 33 °C, indicating significant cellular stress under warm conditions. Carbon fixation and assimilation genes (rcbLS, cbbA, zwf, glgP) showed minimum expression values at 20 °C and 33 °C, but the diel expression patterns of these genes remained unaffected by temperature conditions, being consistently upregulated during day-time. By contrast, some genes involved in photosynthesis (acpA, psbABO, psaABD) were strongly upregulated during night-time under warm conditions, suggesting regulatory imbalances during the diel cycle. Notably, the expression of genes related to the synthesis of osmolytes against salt stress and fatty acid desaturases, which are typically upregulated under cold temperature in other cyanobacteria, was induced in warm acclimated RS9907 cells. These results highlight distinct transcriptional mechanisms of thermal acclimation in members of the Synechococcus clade II compared to other cyanobacterial lineages. This emphasizes the importance of understanding the diverse and intricate ways in which marine cyanobacteria adapt to temperature fluctuations.

{"title":"The dominant marine Synechococcus clade II exhibits a non-canonical transcriptional response to cope with thermal stress","authors":"Isabel Escribano-Gómez , Raquel Liébana , Antonio S. Palacio , Abbrar Labban , Xosé Anxelu G. Morán , Ángel López-Urrutia , Laura Alonso-Sáez","doi":"10.1016/j.algal.2024.103840","DOIUrl":"10.1016/j.algal.2024.103840","url":null,"abstract":"<div><div>Temperature significantly impacts the growth and distribution of marine cyanobacteria, which employ diverse strategies to cope with temperature variations. However, the molecular mechanisms underlying thermal acclimation in cyanobacterial taxa that dominate vast oligotrophic regions of the ocean, such as the <em>Synechococcus</em> clade II, remain unknown. Here, we analysed the physiological and global transcriptional response of an ecologically relevant clade II strain (<em>Synechococcus</em> sp. RS9907) to long-term thermal acclimation at temperatures from 20 to 33 °C. The growth rate in RS9907 increased linearly with temperature up to the warm threshold (33 °C), but genes related with the heat-shock response were upregulated within the range of 28 to 33 °C, indicating significant cellular stress under warm conditions. Carbon fixation and assimilation genes (<em>rcbLS, cbbA, zwf, glgP</em>) showed minimum expression values at 20 °C and 33 °C, but the diel expression patterns of these genes remained unaffected by temperature conditions, being consistently upregulated during day-time. By contrast, some genes involved in photosynthesis (<em>acpA</em>, <em>psbABO</em>, <em>psaABD</em>) were strongly upregulated during night-time under warm conditions, suggesting regulatory imbalances during the diel cycle. Notably, the expression of genes related to the synthesis of osmolytes against salt stress and fatty acid desaturases, which are typically upregulated under cold temperature in other cyanobacteria, was induced in warm acclimated RS9907 cells. These results highlight distinct transcriptional mechanisms of thermal acclimation in members of the <em>Synechococcus</em> clade II compared to other cyanobacterial lineages. This emphasizes the importance of understanding the diverse and intricate ways in which marine cyanobacteria adapt to temperature fluctuations.</div></div>","PeriodicalId":7855,"journal":{"name":"Algal Research-Biomass Biofuels and Bioproducts","volume":"85 ","pages":"Article 103840"},"PeriodicalIF":4.6,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143180803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"生物学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

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