<scp>CO<sub>2</sub></scp> supply modulates lipid remodelling, photosynthetic and respiratory activities in <i>Chlorella</i> species

Cecchin, Michela; Paloschi, Matteo; Busnardo, Giovanni; Cazzaniga, Stefano; Cuiné, Stéphan; Li‐Beisson, Yonghua; Wobbe, Lutz; Ballottari, Matteo

doi:10.1111/pce.14074

Cited by 14 publications

(3 citation statements)

References 67 publications

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“…The higher increase in chlorophyll b content, comparing to the increase in chlorophyll a content in the microalgae culture stimulated by CO 2 desorbed from CM 1:8, suggests a rearrangement of the photosynthetic machinery and a higher oxidative stress in this culture. Similar changes in chlorophyll a/chlorophyll b ratio were reported for C. sorokiniana UTEX 1230 and C. vulgaris 211/11P strains cultivated in media supplemented with CO 2 [91]. Our results demonstrated the potential of microalgal cultivation in combination with CO 2 capture using DESs as a viable method for CO 2 mitigation.…”

Section: Biofixation Of Desorbed Co 2 Using Chlorella Spsupporting

confidence: 85%

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

Brettfeld,

Popa,

Dobre

et al. 2023

Clean Technol.

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In this study, we investigated the use of functionalized deep eutectic solvents (DESs) as a medium for CO2 capture integrated with CO2 desorption and biofixation in microalgal culture, as an approach for carbon capture, utilization, and storage (CCUS). The newly devised DES formulation—comprising choline chloride, ethylene glycol, and monoethanolamine—demonstrated a significant advancement in CO2 absorption capacity compared with conventional solvents. Effective CO2 desorption from the solvent was also achieved, recovering nearly 90% of the captured CO2. We then examined the application of the functionalized DESs to promote microalgal cultivation using a Chlorella sp. strain. The experimental results indicated that microalgae exposed to DES-desorbed CO2 exhibited heightened growth rates and enhanced biomass production, signifying the potential of DES-driven CO2 capture for sustainable microalgal biomass cultivation. This research contributes to the growing field of CCUS strategies, offering an avenue for efficient CO2 capture and conversion into valuable biomasses, thereby contributing to both environmental sustainability and bioresource use.

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Section: Biofixation Of Desorbed Co 2 Using Chlorella Spsupporting

confidence: 85%

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

Brettfeld,

Popa,

Dobre

et al. 2023

Clean Technol.

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“…After genome sequencing and “omics” data availability, it is possible to make a fair comparison of two organisms that fall into the same phylogenetic group such as Chlorella sorokiniana and Chlorella vulgaris [ 37 ]. Both Chlorella strains have previously been used in different studies, evaluating their growth under high CO 2 , reaching 50% [ 39 , 40 , 41 ] to optimize lipid production and to boost CO 2 biofixation using these algae.…”

Section: Discussionmentioning

confidence: 99%

“…These results suggest that illumination and CO 2 levels control photosynthesis in different ways in these Chlorella strains. A recent study also reported that photosynthetic properties of C. vulgaris and C. sorokiniana are differently influenced by CO 2 availability [ 41 ]. This information is very valuable for scaling up experiments in order to maintain efficient photosynthetic activities under various CO 2 conditions.…”

Section: Discussionmentioning

confidence: 99%

CO2 Levels Modulate Carbon Utilization, Energy Levels and Inositol Polyphosphate Profile in Chlorella

Morales-Pineda

Garcia-Gómez

Bedera-García

et al. 2022

Plants

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Microalgae have a growing recognition of generating biomass and capturing carbon in the form of CO2. The genus Chlorella has especially attracted scientists’ attention due to its versatility in algal mass cultivation systems and its potential in mitigating CO2. However, some aspects of how these green microorganisms respond to increasing concentrations of CO2 remain unclear. In this work, we analyzed Chlorella sorokiniana and Chlorella vulgaris cells under low and high CO2 levels. We monitored different processes related to carbon flux from photosynthetic capacity to carbon sinks. Our data indicate that high concentration of CO2 favors growth and photosynthetic capacity of the two Chlorella strains. Different metabolites related to the tricarboxylic acid cycle and ATP levels also increased under high CO2 concentrations in Chlorella sorokiniana, reaching up to two-fold compared to low CO2 conditions. The signaling molecules, inositol polyphosphates, that regulate photosynthetic capacity in green microalgae were also affected by the CO2 levels, showing a deep profile modification of the inositol polyphosphates that over-accumulated by up to 50% in high CO2 versus low CO2 conditions. InsP4 and InsP6 increased 3- and 0.8-fold, respectively, in Chlorella sorokiniana after being subjected to 5% CO2 condition. These data indicate that the availability of CO2 could control carbon flux from photosynthesis to carbon storage and impact cell signaling integration and energy levels in these green cells. The presented results support the importance of further investigating the connections between carbon assimilation and cell signaling by polyphosphate inositols in microalgae to optimize their biotechnological applications.

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Innovative multiple resource recovery pathways from EBPR wastewater treatment–derived sludge

Binder

Frison

Guerra-Gorostegi

et al. 2023

Biomass Conv. Bioref.

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Wastewater treatment–derived sludge is a growing concern. Environmental issues, rising sludge production rates, and stringent regulations create the necessity to seek for treatment and valorization alternatives. Sludge is a potential source of high-value materials which can be recovered and transformed into new products such as animal feeds; bioplastics; biofuels, biostimulants; or biobased fertilizers. Considering the current legal constraints hindering the use of certain waste streams, the objective of this work is to show the technical viability for obtaining multiple valuable products from sludge. The emphasis is placed on novel valorization pathways, such as microalgae and purple bacteria cultures growing over sludge. The obtained products are benchmarked against traditional methods for resource recovery such as direct land application and P recovery from ashes. Our results show, besides the nutrient (TKN 7.38, TP 4.41; K 0.47 g 100 g TS-1) and energy content (HHV 22.53 MJ Kg-1 TS), that sludge could be employed to produce a suitable growing medium for microalgae and purple bacteria cultures obtaining, in the latter, remarkable high contents of high-quality proteins (64.50 % dw) for potential valorization as animal feed ingredient. We also obtained nutrient rich microalgae biomass (TKN 7.10, TP 8.10; K 0.40 g 100 g TS-1) which could be used as inputs for biobased fertilizers or biostimulants preliminarily complying with the nutrient requirements in EU 2019/1009. Current global scenario, showing economic and supply risk uncertainties regarding food production inputs, generates the urgent need to find feasible pathways for obtaining recovered products such as the ones presented in this study. Graphical abstract

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CO₂ supply modulates lipid remodelling, photosynthetic and respiratory activities in Chlorella species

Cited by 14 publications

References 67 publications

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

CO2 Levels Modulate Carbon Utilization, Energy Levels and Inositol Polyphosphate Profile in Chlorella

Innovative multiple resource recovery pathways from EBPR wastewater treatment–derived sludge

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CO2 supply modulates lipid remodelling, photosynthetic and respiratory activities in Chlorella species

Cited by 14 publications

References 67 publications

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

CO2 Capture Using Deep Eutectic Solvents Integrated with Microalgal Fixation

CO2 Levels Modulate Carbon Utilization, Energy Levels and Inositol Polyphosphate Profile in Chlorella

Innovative multiple resource recovery pathways from EBPR wastewater treatment–derived sludge

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Product

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CO₂ supply modulates lipid remodelling, photosynthetic and respiratory activities in Chlorella species