Carbon dots enhance the recovery of microalgae bioresources from wastewater containing amoxicillin

Zhao, Zhenhao; Xue, Ren; Fu, Liang; Chen, Congli; Ndayisenga, Fabrice; Zhou, Dandan

doi:10.1016/j.biortech.2021.125258

Cited by 22 publications

(15 citation statements)

References 36 publications

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Section: Discussionmentioning

confidence: 90%

“…Similarly, Zhao et al (2021) reported that the presence of CDs increased the production of proteins, pigments, and lipids. They stated that the CDs shift the absorption spectrum in microalgae and the red light captured promoted lipid and polyunsaturated fatty acids production (Zhao et al 2021). These results are also in agreement with those presented by Yang et al (2022), who added CDs in C. pyrenoidosa cultures; they reported an increment in the specific growth rate, lipid content, and pigment productivity in comparison to the control samples.…”

Section: Discussionmentioning

confidence: 90%

“…In this manner, due to insufficient light capture, the biomass growth was driven to photo-limitation conditions, where an extra light capture source is necessary to increase the microalgae growth, otherwise, the cell growth could be inhibited (Chen et al 2011). The green-synthesized CDs could increase light adsorption due to the ability of such nanoparticles to shift the ultraviolet light (500-600 nm) and turn it into red light (580-700 nm) (Zhao et al 2021).…”

Section: Discussionmentioning

confidence: 99%

“…In the existing literature, studies investigating the effect of CDs on microalgae mainly employ pure chemicals as carbon precursors for the CDs' synthesis (Zhao et al 2021, Yang et al 2022. While these studies have contributed valuable insights into the interaction between CDs and microalgae, as well as the positive role of CDs in the enhancement of biocompound production, a significant knowledge gap persists in our understanding concerning the potential benefits offered by CDs derived from green precursors.…”

Section: Introductionmentioning

confidence: 99%

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Effect of carbon dots supplementation in Chlorella vulgaris biomass production and its composition

Solis Flores,

López-Pacheco,

Villalba-Rodriguez

et al. 2024

Nano Ex.

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Microalgae cultures have an excellent ability to capture CO2 and produce high, medium, and low valuable biocompounds such as proteins, carbohydrates, lipids, pigments, and polyhydroxyalkanoates; those compounds have shown excellent properties in the pharmaceutical, cosmetic, food, and medical industries. Recently, the supplementation of carbon dots (CDs) in microalgae cultures has been explored as a new strategy to increase light capture and improve photoluminescence, which in turn enhances biomass growth and biocompounds production. In this work, we synthesized CDs through a simple carbonization method using orange juice as a natural precursor. The green synthesized CDs were analyzed in detail through characterization techniques such as Fourier-transform infrared spectroscopy (FTIR), UV–visible, fluorescence spectroscopy, and ζ potential analysis. Moreover, CDs were added to Chlorella vulgaris to analyze the response under different photoperiod cycles and CDs dosages. The optimal results were obtained with the addition of 0.5 mg/L of CDs under a photoperiod cycle of 16h:8h (light:dark). In these conditions, a maximum biomass production of 2.12 g/L was observed, which represents an enhancement of 112% and 17% in comparison to the control samples under the photoperiod of 12h:12 h and 16h:8h (light/dark), respectively. Furthermore, the production of lipids, proteins, and carbohydrates was significantly increased to 249 mg/g, 285 mg/g, and 217 mg/g dry weight, respectively. These results suggest that the addition of CDs enhances cell growth and increases the production of lipids and proteins, being a strategy with great potential for the food and pharmaceutical industries.

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Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 90%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of carbon dots supplementation in Chlorella vulgaris biomass production and its composition

Solis Flores,

López-Pacheco,

Villalba-Rodriguez

et al. 2024

Nano Ex.

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“…AMX, known as a beta-lactam antibiotic, can disrupt penicillin-binding proteins and interfere in the biosynthesis of the cell walls, causing osmotic rupture of the microalgae [41]. Also, beta-lactams significantly inhibit the growth and physiological processes of the algae by disturbing the primary photochemistry, photophosphorylation, electron transport, and carbon assimilation [42], which can lead to a reduction in biomass growth, a reduction in various syntheses [43,44], and even cell death [45]. Thus, the experimental results evidence that as the concentration of residual antibiotics increases, this reduces the microalgal growth rate by ~26.1% according to the prescribed inhibition mechanisms.…”

Section: Negative Effect On the Microalgae Growth Of Amxmentioning

confidence: 99%

The Crucial Impact of Microbial Growth and Bioenergy Conversion on Treating Livestock Manure and Antibiotics Using Chlorella sorokiniana

Kim,

Jeong,

Lee

et al. 2024

Processes

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The residual antibiotics in livestock excreta (LE) have been regarded as a potential threat to the ecosystem and human society. Some photoautotrophic microalgae, however, were found to metabolize them during active biomass photosynthesis. This study investigates how the strength of the antibiotics impacts the overall biodiesel yield and composition of the harvested microalgal biomass grown from LE. The microalgal growth results demonstrate that increasing the concentration of residual antibiotics suppresses the microalgal growth rate from 0.87 d−1 to 0.34 d−1. This 61% lower biomass production rate supports the proposition that the kinetic impact of antibiotics may slow lipid synthesis. Moreover, the analytical results of fatty acid methyl ester (FAME) demonstrate that amoxicillin substantially reduces the C16:0 content by over 96%. This study evidences that the functional group similarity of amoxicillin may competitively inhibit the esterification reaction by consuming methanol. This explanation further highlights that residual antibiotics interfere with microalgal lipid synthesis and its transesterification. Moreover, it was confirmed that the presence of residual antibiotics may not affect the major nutrient removal (total nitrogen: 74.5~78.0%, total phosphorus: 95.6~96.8%). This indicates that residual antibiotics inhibit the metabolism associated with carbon rather than those associated with nitrogen and phosphorus, which is connected to the decrease in the biodiesel yield. Overall, these results reveal that the frequent abuse of antibiotics in livestock may harm the eco-friendly conversion of waste-into-bioenergy strategy.

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The growth and lipid accumulation of Scenedesmus quadricauda under nitrogen starvation stress during xylose mixotrophic/heterotrophic cultivation

Mou

Liu

et al. 2022

Environ Sci Pollut Res

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In order to conquer the block of high cost and low yields which limit to realize the commercialization of microalgal biodiesel, the mixotrophic and heterotrophic cultivation of Scenedesmus quadricauda FACHB-1297 fed on xylose was studied separately employing six forms of media: phosphorus su cient, phosphorus restricted and phosphorus starvation were combined with nitrogen su cient and nitrogen starvation conditions. The maximum oil percentage (about 41% of dry weight) was obtained on the 5th day (heterotrophic cultivation) and 8th day (mixotrophic cultivation) under the nitrogen starved and phosphorus su cient (N 0 &P) conditions, which was about 2-fold in comparison to the initial lipid content on the su cient nitrogen condition (control). Under mixotrophic and heterotrophic modes, the highest lipid productions were both achieved in the N 0 &P trial, with the value of 274.97 mg/L and 193.77 mg/L, successively. Xylose utilization rate of 30%-96% under heterotrophic modes was apparently higher than that of 20%-50% in mixotrophic modes. In contrast, phosphorus uptake rate of 100% under mixotrophic modes was signi cantly more than that of 60%-90% in heterotrophic cultivation. Furthermore, under xylose heterotrophic cultivation, the phosphorus had a positive impact on microalgae cell synthesis, and the oil content enhanced with the augmentation in phosphorus concentrations. We suggest that su cient phosphorus should be supplied for obtaining more microalgal lipid production in the lack of nitrogen for xylose heterotrophic and mixotrophic conditions. This is a highly effective way to obtain e cient microalgae biofats production.

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Carbon dots enhance the recovery of microalgae bioresources from wastewater containing amoxicillin

Cited by 22 publications

References 36 publications

Effect of carbon dots supplementation in Chlorella vulgaris biomass production and its composition

Effect of carbon dots supplementation in Chlorella vulgaris biomass production and its composition

The Crucial Impact of Microbial Growth and Bioenergy Conversion on Treating Livestock Manure and Antibiotics Using Chlorella sorokiniana

The growth and lipid accumulation of Scenedesmus quadricauda under nitrogen starvation stress during xylose mixotrophic/heterotrophic cultivation

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