Growth and photosynthesis of Chlorella strains from polar, temperate and tropical freshwater environments under temperature stress

Lee, Kok Keong; Lim, Phaik Eem; Poong, Sze-Wan; Wong, Chiew Yen; Phang, Siew Moi; Beardall, John

doi:10.1007/s00343-018-7093-x

Cited by 19 publications

(10 citation statements)

References 51 publications

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“…Among the microalgal pigments, carotenoids are of huge significance for both microalgal physiology and commercial applications. Beside their role in light absorption, microalgal carotenoids are also known to play a key role in protecting photosynthetic systems against oxidative stress [ 50 ]. That said, Chlorophyll a to carotenoid ratio is used as an indicator for both carotenoid level and stress response; low ratio signifies high carotenoids content and increased response to physiological stress [ 50 ].…”

Section: Resultsmentioning

confidence: 99%

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

et al. 2022

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Microalgal biomass provides a renewable source of biofuels and other green products. However, in order to realize economically viable microalgal biorefinery, strategic identification and utilization of suitable microalgal feedstock is fundamental. Here, a multi-step suboptimal screening strategy was used to target promising microalgae strains from selected freshwaters of the study area. The resulting strains were found to be affiliated to seven closely-related genera of the family Scenedesmaceae, as revealed by both morphologic and molecular characterization. Following initial screening under upper psychrophilic to optimum mesophilic (irregular temperature of 14.1 to 35.9°C) cultivation conditions, superior strains were chosen for further studies. Further cultivation of the selected strains under moderate to extreme mesophilic cultivation conditions (irregular temperature of 25.7 to 42.2°C), yielded up to 74.12 mgL-1day-1, 19.96 mgL-1day-1, 48.56%, 3.34 μg/mL and 1.20 μg/mL, for biomass productivity, lipid productivity, carbohydrate content, pigments content and carotenoids content respectively. These performances were deemed promising compared with some previous, optimum conditions-based reports. Interestingly, the fatty acids profile and the high carotenoids content of the studied strains revealed possible tolerance to the stress caused by the changing suboptimal cultivation conditions. Overall, strains AY1, CM6, LY2 and KL10 were exceptional and may present sustainable, promising feedstock for utilization in large-scale generation of green products, including biodiesel, bioethanol, pigments and dietary supplements. The findings of this study, which exposed promising, eurythermal strains, would expand the current knowledge on the search for promising microalgae strains capable of performing under the largely uncontrolled large-scale cultivation settings.

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Section: Resultsmentioning

confidence: 99%

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

et al. 2022

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“…In microalgae cultivation is important to consider and control different variables, namely, light supply, photobioreactor type, dissolved oxygen concentration, culture media, etc., to optimize their growth and byproducts accumulation. Microalgae metabolism is versatile since they are able to grow under heterotrophic, autotrophic and mixotrophic conditions, as well as to tolerate a broad range of pH, salinity and temperatures [75][76][77][78], among other conditions. Large amounts of microalgae can be produced through various configurations of photobioreactors (either close or open), under different environmental conditions (outdoors or indoors) and light regimes (light/dark cycles).…”

Section: Cultivation (Photobioreactors and Growth Conditions)mentioning

confidence: 99%

Microalgae Biomass as a New Potential Source of Sustainable Green Lubricants

et al. 2022

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Lubricants are materials able to reduce friction and/or wear of any type of moving surfaces facilitating smooth operations, maintaining reliable machine functions, and reducing risks of failures while contributing to energy savings. At present, most worldwide used lubricants are derived from crude oil. However, production, usage and disposal of these lubricants have significant impact on environment and health. Hence, there is a growing pressure to reduce demand of this sort of lubricants, which has fostered development and use of green lubricants, as vegetable oil-based lubricants (biolubricants). Despite the ecological benefits of producing/using biolubricants, availability of the required raw materials and agricultural land to create a reliable chain supply is still far from being established. Recently, biomass from some microalgae species has attracted attention due to their capacity to produce high-value lipids/oils for potential lubricants production. Thus, this multidisciplinary work reviews the main chemical-physical characteristics of lubricants and the main attempts and progress on microalgae biomass production for developing oils with pertinent lubricating properties. In addition, potential microalgae strains and chemical modifications to their oils to produce lubricants for different industrial applications are identified. Finally, a guide for microalgae oil selection based on its chemical composition for specific lubricant applications is provided.

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“…Mass cultivation of microalgae will be required to meet the potential demand for biomass in various industries, leading to the development of the open pond type race way system ( Ryu et al., 2019 ; Banu et al., 2020 ). This system can effectively produce large amounts of microalgal biomass at a low cost but has a risk of exposure to stress from external environments, such as light and extreme temperatures ( Lee et al., 2018 ; Akizuki et al., 2020 ; Ma et al., 2020 ). Microalgae are photosynthetic organisms, but the light intensity and temperature required for optimal growth differ between species ( Lee et al., 2018 ; Ma et al., 2020 ).…”

Section: Introductionmentioning

confidence: 99%

“…This system can effectively produce large amounts of microalgal biomass at a low cost but has a risk of exposure to stress from external environments, such as light and extreme temperatures ( Lee et al., 2018 ; Akizuki et al., 2020 ; Ma et al., 2020 ). Microalgae are photosynthetic organisms, but the light intensity and temperature required for optimal growth differ between species ( Lee et al., 2018 ; Ma et al., 2020 ). Indeed, the range of light intensity and temperature under which microalgal growth is inhibited varies between species ( Isdepsky and Borowitzka, 2019 ; Rayen et al., 2019 ).…”

Section: Introductionmentioning

confidence: 99%

“…Indeed, the range of light intensity and temperature under which microalgal growth is inhibited varies between species ( Isdepsky and Borowitzka, 2019 ; Rayen et al., 2019 ). Therefore, it is important to select a suitable species for biomass production of microalgae using the open pond type raceway system ( Isdepsky and Borowitzka, 2019 ; Rayen et al., 2019 ) and one which can adapt to conditions of high light intensity and temperature ( Lee et al., 2018 ; Rayen et al., 2019 ; Akizuki et al., 2020 ). Such environmental conditions have been shown to increase the lipid and saturated fatty acid content of microalgae ( Han et al., 2016 ; Hong et al., 2019 ; Yaisamlee and Sirikhachornkit, 2020 ), further suggesting the importance of adaptation to these conditions in the microalgal species we aim to select.…”

Section: Introductionmentioning

confidence: 99%

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Characterization of Chlorella sorokiniana and Chlorella vulgaris fatty acid components under a wide range of light intensity and growth temperature for their use as biological resources

Yun

Kim

Yoon

2020

Heliyon

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This study aims to characterize the potential of three strains of microalgal species ( Chlorella sorokiniana KNUA114 and KNUA122; C. vulgaris KNUA104) for use as feedstock, based on their fatty acid compositions. Each strain was molecularly identified using four marker genes ( ITS , SSU , rbcL , and tufA ) and phylogenetically characterized. C. sorokiniana and C. vulgaris collected from Ulleung Island, South Korea, were homologous with other known species groups. Samples' fatty acid components were measured using GC/MS analysis in growth temperatures of 10 °C, 25 °C, and 35 °C. The growth rate of C. sorokiniana strains was higher than that of C. vulgaris under high-temperature conditions, confirming the potential industrial applicability of the former as feedstock material. Additionally, saturated fatty acid contents and productivities increased as biological resources of the C. sorokiniana strains were higher than those of C. vulgaris under high light intensity and temperature conditions. These results suggest that the fatty acid components of C. sorokiniana strains may potentially be used as biological resources (e.g., feedstock).

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Growth and photosynthesis of Chlorella strains from polar, temperate and tropical freshwater environments under temperature stress

Cited by 19 publications

References 51 publications

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Novel microalgae strains from selected lower Himalayan aquatic habitats as potential sources of green products

Microalgae Biomass as a New Potential Source of Sustainable Green Lubricants

Characterization of Chlorella sorokiniana and Chlorella vulgaris fatty acid components under a wide range of light intensity and growth temperature for their use as biological resources

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