New technologies from the bioworld: selection of biopolymer-producing microalgae

Martins, Roberta Guimarães; Gonçalves, Ígor Severo; Morais, Michele Greque de; Costa, Jorge Alberto Vieira

doi:10.1590/0104-1428.2375

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…Highest yields were obtained with Spirulina sp. LEB 18 which produced 1.48 g/L/d PHB in 15 d equivalent to 20.62% of cdw (Martins et al, 2017). As evident, improvement in the yield of PHA production is the major issue related to Arthrospira and Mixotrophic or heterotrophic culture, and condition optimization has helped and can help further to improve the yields.…”

Section: Arthrospiramentioning

confidence: 99%

“…Since the first report of PHB production that was 8.6% of cdw by Nostoc muscorum under photoautotrophic conditions in 2005, number of species have been reported for PHA production under phosphate and nitrogen limitation (Sharma and Mallick, 2005a). Later, PHB content up to 19.27% with N. ellipsosporum and 22% with N. muscorum was reported under photoautotrophic conditions (Panda et al, 2005;Martins et al, 2017). Diverting the flux toward PHB production pathway by using metabolic inhibitors carbonylcyanide m-chlorophenylhydrazone (CCCP) and dicyclohexylcarbodiimide (DCCD) resulted in PHB accumulation increment up to 21 and 17% from an initial PHB content of 8.5% of dry weight, respectively (Mallick et al, 2007).…”

Section: Nostocmentioning

confidence: 99%

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Challenges and Perspectives of Polyhydroxyalkanoate Production From Microalgae/Cyanobacteria and Bacteria as Microbial Factories: An Assessment of Hybrid Biological System

Afreen

Tyagi

Singh

et al. 2021

Front. Bioeng. Biotechnol.

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Polyhydroxyalkanoates (PHAs) are the biopolymer of choice if we look for a substitute of petroleum-based non-biodegradable plastics. Microbial production of PHAs as carbon reserves has been studied for decades and PHAs are gaining attention for a wide range of applications in various fields. Still, their uneconomical production is the major concern largely attributed to high cost of organic substrates for PHA producing heterotrophic bacteria. Therefore, microalgae/cyanobacteria, being photoautotrophic, prove to have an edge over heterotrophic bacteria. They have minimal metabolic requirements, such as inorganic nutrients (CO2, N, P, etc.) and light, and they can survive under adverse environmental conditions. PHA production under photoautotrophic conditions has been reported from cyanobacteria, the only candidate among prokaryotes, and few of the eukaryotic microalgae. However, an efficient cultivation system is still required for photoautotrophic PHA production to overcome the limitations associated with (1) stringent management of closed photobioreactors and (2) optimization of monoculture in open pond culture. Thus, a hybrid system is a necessity, involving the participation of microalgae/cyanobacteria and bacteria, i.e., both photoautotrophic and heterotrophic components having mutual interactive benefits for each other under different cultivation regime, e.g., mixotrophic, successive two modules, consortium based, etc. Along with this, further strategies like optimization of culture conditions (N, P, light exposure, CO2 dynamics, etc.), bioengineering, efficient downstream processes, and the application of mathematical/network modeling of metabolic pathways to improve PHA production are the key areas discussed here. Conclusively, this review aims to critically analyze cyanobacteria as PHA producers and proposes economically sustainable production of PHA from microbial autotrophs and heterotrophs in “hybrid biological system.”

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Section: Arthrospiramentioning

confidence: 99%

Section: Nostocmentioning

confidence: 99%

Challenges and Perspectives of Polyhydroxyalkanoate Production From Microalgae/Cyanobacteria and Bacteria as Microbial Factories: An Assessment of Hybrid Biological System

Afreen

Tyagi

Singh

et al. 2021

Front. Bioeng. Biotechnol.

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“…Moreover, Spirulina sp. was described as a good candidate for PHB production; the yield was 21% of the cell dry weight in 15 days (Martins et al, 2017). Recently, PHB was detected in C. vulgaris by its extraction from the biomass using hot chloroform (Robert & Iyer, 2018) and it was quantified in a different study from 0.6 g of C. vulgaris biomass using mechanical (sonication) and chemical (NaClO) cell disruption methods, and the best yield was 37% (Setyorini & Dianursanti, 2021).…”

Section: Polyhydroxyalkanoatesmentioning

confidence: 99%

New insights into Chlorella vulgaris applications

Al‐Hammadi,

Güngörmüşler

2024

Biotech & Bioengineering

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Environmental pollution is a big challenge that has been faced by humans in contemporary life. In this context, fossil fuel, cement production, and plastic waste pose a direct threat to the environment and biodiversity. One of the prominent solutions is the use of renewable sources, and different organisms to valorize wastes into green energy and bioplastics such as polylactic acid. Chlorella vulgaris, a microalgae, is a promising candidate to resolve these issues due to its ease of cultivation, fast growth, carbon dioxide uptake, and oxygen production during its growth on wastewater along with biofuels, and other productions. Thus, in this article, we focused on the potential of Chlorella vulgaris to be used in wastewater treatment, biohydrogen, biocement, biopolymer, food additives, and preservation, biodiesel which is seen to be the most promising for industrial scale, and related biorefineries with the most recent applications with a brief review of Chlorella and polylactic acid market size to realize the technical/nontechnical reasons behind the cost and obstacles that hinder the industrial production for the mentioned applications. We believe that our findings are important for those who are interested in scientific/financial research about microalgae.

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“…На концентрацію ПГБ у мікроводоростях впливають джерела поживних речовин, отриманих мікроводоростями у процесі культивування. Азот і фосфор -два основні поживні елементи, необхідні мікроводоростям для накопичення великої кількості ПГБ (Martins et al, 2017). Тому, культури мікроводоростей, біомасу яких планують використовувати як сировину для отримання біопластмас, потрібно забезпечувати достатньою кількістю фосфору та азоту.…”

Section: Chlorella Spunclassified

Potential of the biodegradability and characteristics of bio-plastic from microalgae residues

Wong¹,

Roma²

2021

Algologia

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Petroleum-based plastic has been widely used in many industries. However, it takes hundreds of years to degrade and causes widespread pollution to our environment. These problems led to the invention of bioplastics, which were comprised of natural biopolymers made from starch. The production of bioplastics from food-based starches such as tapioca and corn created competition between food and bioplastic production industries. Hence, this research study focuses on producing bioplastic from microalgae residue, which is a non-food based raw material that uses four different types of plasticizers: glycerol, sorbitol, glutaraldehyde and polyethylene glycol (PEG). Microalgae species for identification were obtained from the fish pond at the University Malaysia of Kelantan, before cultivating the species for 14 days. The microalgae residues were extracted through the centrifugation process. Three species were identified under the light microscope, Chlorella sp., Scenedesmus sp. and Monoraphidium sp. The production of bioplastic involved a manual stirring method using a hotplate magnetic stirrer, followed by drying the bioplastic in an oven at 60 oC. Results obtained showed that sorbitol and glycerol from microalgae are suitable to be used as a plasticizer for the production of bioplastic, however glutaraldehyde and PEG are not suitable. Bioplastics that used PEG and glutaraldehyde became cracked and brittle after the drying process. The characterization of bioplastics includes universal tensile testing machines, Fourier-transform infrared analysis and biodegradability tests being processed//undertaken on glycerol-based and sorbitol based bioplastic. Characterization of bioplastics proved that both glycerol and sorbitol have high potential for applications in daily human life. Bioplastics which used sorbitol as a plasticizer could be used in can be applied the production of plastic goods such as toys and household items due to its good resistance toward stress and minimal flexibility. Meanwhile bioplastics which used glycerol as a plasticizer could be applied to the production of plastic bags and plastic food wrap due to its elastic and flexible nature.

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New technologies from the bioworld: selection of biopolymer-producing microalgae

Cited by 12 publications

References 30 publications

Challenges and Perspectives of Polyhydroxyalkanoate Production From Microalgae/Cyanobacteria and Bacteria as Microbial Factories: An Assessment of Hybrid Biological System

Challenges and Perspectives of Polyhydroxyalkanoate Production From Microalgae/Cyanobacteria and Bacteria as Microbial Factories: An Assessment of Hybrid Biological System

New insights into Chlorella vulgaris applications

Potential of the biodegradability and characteristics of bio-plastic from microalgae residues

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