Heterotrophic growth of Galdieria sulphuraria on residues from aquaculture and fish processing industries

Pleissner, Daniel; Schönfelder, Stephanie; Händel, Nicole; Dalichow, Julia; Ettinger, Judith; Kvangarsnes, Kristine; Dauksas, Egidijus; Rustad, Turid; Cropotova, Janna

doi:10.1016/j.biortech.2023.129281

Cited by 11 publications

(4 citation statements)

References 40 publications

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“…In contrast, the fraction corresponding to the 400 MPa x 4 min pretreatment condition displayed the lowest (3.7 ± 2.3 g/100 g dry weight). One of the possible utilization of the solids/paste fraction could be its application as a nutrient-rich substrate for microalgae cultivation (Pleissner et al, 2023). This approach could represent a sustainable utilization of the fractions generated in this study.…”

Section: Proximate Compositionmentioning

confidence: 98%

Effect of high-pressure pretreatment on enzymatic hydrolysis of a mixture of rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) rest raw material

Kotsoni,

Daukšas,

Aas

et al. 2024

Front. Sustain. Food Syst.

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IntroductionFish rest raw material generated from the fish processing industry may be a useful resource for recovery of added value compounds. The application of non-thermal novel technologies can improve the extraction. High-pressure processing (HPP) has long been used for the preservation and extension of the shelf life of seafood. It also constitutes a promising technology for the increased recovery of valuable compounds, such as lipids and proteins. The objective of this study was to assess the yield and the chemical composition of the fractions obtained after enzymatic hydrolysis on a mixture of Atlantic salmon (Salmo salar) and rainbow trout (Oncorhynchus mykiss) rest raw material pretreated by high-pressure (HP).MethodsSix different pretreatments were applied prior to enzymatic hydrolysis; 600 MPa x 8 min, 600 MPa x 4 min, 400 MPa x 8 min, 400 MPa x 4 min, 200 MPa x 8 min, 200 MPa x 4 min.Results and discusssionThese applied pretreatments did not yield higher oil extraction compared to the control. However, the fish protein hydrolysates (FPH) contained higher amount of protein when compared to the FPH obtained from the control.

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Section: Proximate Compositionmentioning

confidence: 98%

Effect of high-pressure pretreatment on enzymatic hydrolysis of a mixture of rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) rest raw material

Kotsoni,

Daukšas,

Aas

et al. 2024

Front. Sustain. Food Syst.

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“…No pathogens such as Salmonella sp. could be detected under the nonsterile conditions . The SCP contains high amounts of protein and oil, in addition to being a good source of polysaccharides, minerals, and pigments including chlorophylls, carotenoids, and phycobiliproteins.…”

Section: Green Chemistry To Valorize Seafood Side Streamsmentioning

confidence: 99%

Green Chemistry to Valorize Seafood Side Streams: An Ecofriendly Roadmap toward Sustainability

Venugopal,

Sasidharan,

Rustad

2023

J. Agric. Food Chem.

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A major challenge facing sustainable seafood production is the voluminous amounts of nutrient-rich seafood side streams consisting of by-catch, processing discards, and process effluents. There is a lack of a comprehensive model for optimal valorization of the side streams. Upcoming green chemistry-based processing has the potential to recover diverse valuable compounds from seafood side streams in an ecofriendly manner. Microbial and enzymatic bioconversions form major green processes capable of releasing biomolecules from seafood matrices under mild conditions. Novel green solvents, because of their low toxicity and recyclable nature, can extract bioactive compounds. Nonthermal technologies such as ultrasound, supercritical fluid, and membrane filtration can complement green extractions. The extracted proteins, peptides, polyunsaturated fatty acids, chitin, chitosan, and others function as nutraceuticals, food supplements, additives, etc. Green processing can address environmental, economic, and technological challenges of valorization of seafood side streams, thereby supporting sustainable seafood production. Green processing can also encourage bioenergy production. Multiple green processes, integrated in a marine biorefinery, can optimize valorization on a zero-waste trade-off, for a circular blue economy. A green chemistry-based valorization framework has the potential to meet the Sustainable Development Goals (SDGs) of the United Nations.

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“…A biochemical analysis of the produced G. sulphuraria biomass and a chemical analysis of the cultivation medium were carried out as described in [16]. The biochemical composition of the G. sulphuraria biomass was analysed using near infrared spectroscopy (Unity Scientific GmbH, Weiler bei Bingen, Germany).…”

Section: Chemical Analysismentioning

confidence: 99%

“…For example, Galdieria sulphuraria is a red alga that has been shown to be highly tolerant to extreme environmental conditions, such as high temperatures and low pHs [14,15]. The utilization of organic waste streams using G. sulphuraria typically involves the heterotrophic cultivation of the alga in a bioreactor, where the algae can use organic matter as a carbon, nitrogen, and phosphorus source for growth [16]. During this process, the organic matter is converted into biomass, which can be harvested and converted into valuable products.…”

Section: Introductionmentioning

confidence: 99%

Algae Cultivation as Measure for the Sanitation of Organic Waste—A Case Study Based on the Alga Galdieria sulphuraria Grown on Food Waste Hydrolysate in a Continuous Flow Culture

Pleissner,

Händel

2023

Sustainability

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Due to its growth under harsh acidic conditions, the microalga Galdieria sulphuraria may offer the opportunity to combine sanitation and the utilization of organic waste streams. To further deepen the knowledge of alternative waste treatment strategies that allow for holistic utilization, the control and removal of microbial contaminants via non-sterile heterotrophic G. sulphuraria on food waste hydrolysate were investigated in a continuous flow bioreactor culture. Furthermore, a substrate reservoir and harvested biomass were stored under non-sterile conditions over a period of 12 days. Despite the non-sterile conditions, the microbial load of the biomass could be kept under control. Neither the pathogen Salmonella sp. nor the coliform bacteria Escherichia coli could be found. Only nine counts per g of biomass were found for species belonging to Enterococcus spp., Enterobacteriacae, and moulds. Aerobic spore formers were counted with 2700 counts per g of biomass. Most of the aerobic mesophilic counts were formed by yeasts (1.5 × 106 vs. 1.3 × 106 counts per g biomass). The results revealed that, when using acidic growth conditions, contamination will not take over the culture; thus, the sterilization of waste materials can be skipped. It is assumed that such an approach can result in efficient processes for future waste-based bioeconomy strategies.

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Heterotrophic growth of Galdieria sulphuraria on residues from aquaculture and fish processing industries

Cited by 11 publications

References 40 publications

Effect of high-pressure pretreatment on enzymatic hydrolysis of a mixture of rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) rest raw material

Effect of high-pressure pretreatment on enzymatic hydrolysis of a mixture of rainbow trout (Oncorhynchus mykiss) and Atlantic salmon (Salmo salar) rest raw material

Green Chemistry to Valorize Seafood Side Streams: An Ecofriendly Roadmap toward Sustainability

Algae Cultivation as Measure for the Sanitation of Organic Waste—A Case Study Based on the Alga Galdieria sulphuraria Grown on Food Waste Hydrolysate in a Continuous Flow Culture

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