Energy-efficient ultrasound-assisted extraction of food proteins from the microalga C. vulgaris at elevated static pressure

McHardy, Christopher; Kammegne, Thierry Djike; Jänich, I.

doi:10.1016/j.ifset.2021.102797

Cited by 13 publications

(4 citation statements)

References 54 publications

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“…In ultrasound-assisted extraction, the amount of energy delivered increases with the duration of the processing and the amplitude of ultrasonic vibrations. The influence of these parameters on extraction efficiency has been described and explained in numerous studies [17,18].…”

Section: Introductionmentioning

confidence: 99%

Energy Aspects of Flavonoid Extraction from Rowanberry Fruits Using Pulsed Ultrasound-Assisted Extraction

Kobus

Krzywicka

2023

Energies

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The aim of the study was to analyze the influence of the dimensions of extraction cells on the energy aspects and extraction efficiency of flavonoids from rowanberry fruits (S. aucuparia L.). The total flavonoid content was determined using the spectrophotometric method. Response surface methodology (RSM) was used to optimize the variables under investigation. The flavonoid content in the obtained extracts ranged from 0.17 to 0.66 mg QE/g dry matter for cells with a diameter of 3.5 cm, and from 0.19 to 0.7 mg QE/g dry matter for cells with a diameter of 2.5 cm, depending on the other experimental conditions. The energy consumption during extraction in the 3.5 cm diameter cell ranged from 0.451 kJ to 26.120 kJ, while for the 2.5 cm diameter cell, it ranged from 0.637 kJ to 25.677 kJ. The unit energy consumption for the 3.5 cm diameter cell ranged from 1.47 kJ/mg QE/g to 48.92 kJ/mg QE/g. For the 2.5 cm diameter cell, these values ranged from 2.17 kJ/mg QE/g to 40.64 kJ/mg QE/g. Significant effects of the dimensions of the extraction cells on flavonoid yield and unit energy consumption were observed, while there was no impact on electricity consumption. The dimensions of the extraction cells were also found to influence the form of the obtained empirical models.

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Section: Introductionmentioning

confidence: 99%

Energy Aspects of Flavonoid Extraction from Rowanberry Fruits Using Pulsed Ultrasound-Assisted Extraction

Kobus

Krzywicka

2023

Energies

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“…Global meat demand is expected to double by the middle of this century, making the search for new food sources a goal of the utmost importance [ 2 ]. To address the threat of climate change and environmental pollution while ensuring food security for the world's population, reducing meat consumption or replacing them with more sustainable sources of protein is unavoidable [ 3 , 4 ]. Microalgae, as a potential source of non-animal protein, has the advantages of fast growth, short growth cycle, high protein content and no occupation of cultivated land [ 5 , 6 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of C/N ratio on the growth and protein accumulation of heterotrophic Chlorella in broken rice hydrolysate

Cai

Zhai

Fang³

et al. 2022

Biotechnol Biofuels

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Background Microalgae protein is considered as a sustainable alternative to animal protein in the future. Using waste for microalgal culture can upgrade low-value raw materials into high-value products, helping to offset the cost of microalgal protein production. In this study we explored the feasibility of using microalgae heterotrophic fermentation to convert broken rice hydrolysate (BRH) into protein. Results The results showed that the increase of BRH supplemental ratio was beneficial to the increase of biomass production but not beneficial to the increase of intracellular protein content. To further improve protein production, the effect of C/N ratio on intracellular protein accumulation was studied. It was found that low C/N ratio was beneficial to the synthesis of glutamate in microalgae cells, which in turn promoted the anabolism of other amino acids and further the protein. When the C/N ratio was 12:1, the biomass productivity and protein content could reach a higher level, which were 0.90 g/L/day and 61.56%, respectively. The obtained Chlorella vulgaris biomass was rich in essential amino acids (41.80%), the essential amino acid index was as high as 89.07, and the lysine content could reach up to 4.05 g/100 g. Conclusions This study provides a theoretical basis and guidance for using Chlorella vulgaris as an industrial fermentation platform to convert broken rice into products with high nutritional value.

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“…This in turn should enable facilitated separation of the cell debris after extraction of valuable substances of interest. Furthermore, the literature indicates that a PEF seems to be an energetically more efficient method for cell disruption in comparison to bead milling or ultrasound, as it enables the release of water-soluble metabolites at a lower or comparable specific energy input (Boer et al, 2012;Goettel et al, 2013;Postma et al, 2017;McHardy et al, 2021). However, in the context of process design, PEF technology requires a treatment medium with suitable electrical conductivity, which must fit the geometry of the treatment chamber used.…”

Section: Introductionmentioning

confidence: 99%

Decay of Trichomes of Arthrospira platensis After Permeabilization Through Pulsed Electric Fields (PEFs) Causes the Release of Phycocyanin

Knappert¹,

Nolte²,

Friese³

et al. 2022

Front. Sustain. Food Syst.

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The cyanobacterium Arthrospira platensis is a promising source of edible proteins and other highly valuable substances such as the blue pigment-protein complex phycocyanin. Pulsed electric field (PEF) technology has recently been studied as a way of permeabilizing the cell membrane, thereby enhancing the mass transfer of water-soluble cell metabolites. Unfortunately, the question of the release mechanism is not sufficiently clarified in published literature. In this study, the degree of cell permeabilization (cell disintegration index) was directly measured by means of a new method using fluorescent dye propidium iodide (PI). The method allows for conclusions to be drawn about the effects of treatment time, electric field strength, and treatment temperature. Using a self-developed algorithm for image segmentation, disintegration of trichomes was observed over a period of 3 h. This revealed a direct correlation between cell disintegration index and decay of trichomes. This decay, in turn, could be brought into a direct temporal relationship with the release of phycocyanin. For the first time, this study reveals the relationship between permeabilization and the kinetics of particle decay and phycocyanin extraction, thus contributing to a deeper understanding of the release of cell metabolites in response to PEF. The results will facilitate the design of downstream processes to produce sustainable products from Arthrospira platensis.

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Energy-efficient ultrasound-assisted extraction of food proteins from the microalga C. vulgaris at elevated static pressure

Cited by 13 publications

References 54 publications

Energy Aspects of Flavonoid Extraction from Rowanberry Fruits Using Pulsed Ultrasound-Assisted Extraction

Energy Aspects of Flavonoid Extraction from Rowanberry Fruits Using Pulsed Ultrasound-Assisted Extraction

Effects of C/N ratio on the growth and protein accumulation of heterotrophic Chlorella in broken rice hydrolysate

Decay of Trichomes of Arthrospira platensis After Permeabilization Through Pulsed Electric Fields (PEFs) Causes the Release of Phycocyanin

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