Simultaneous increases in specific growth rate and specific lipid content of <i>Chlorella vulgaris</i> through UV‐induced reactive species

Balan, Ranjini; Suraishkumar, G. K.

doi:10.1002/btpr.1854

Cited by 13 publications

(4 citation statements)

References 61 publications

(110 reference statements)

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“…Subsequent oxidized conditions promote biosynthesis of neutral lipids such as triacylglycerols (TAGs), which accumulate, especially under oxidative stress . Also, direct correlations have been observed between neutral lipid accumulation and PSS si‐OH (oxidized conditions) in our previous studies . By adapting to the external cues, ultradian rhythms can anticipate changes which enable them to synchronize cellular processes with the redox states .…”

Section: Resultsmentioning

confidence: 74%

UVA‐induced reset of hydroxyl radical ultradian rhythm improves temporal lipid production in Chlorella vulgaris

Balan

Suraishkumar

2014

Biotechnology Progress

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We report for the first time that the endogenous, pseudo-steady-state, specific intracellular levels of the hydroxyl radical (si-OH) oscillate in an ultradian fashion (model system: the microalga, Chlorella vulgaris), and also characterize the various rhythm parameters. The ultradian rhythm in the endogenous levels of the si-OH occurred with an approximately 6 h period in the daily cycle of light and darkness. Further, we expected that the rhythm reset to a shorter period could rapidly switch the cellular redox states that could favor lipid accumulation. We reset the endogenous rhythm through entrainment with UVA radiation, and generated two new ultradian rhythms with periods of approximately 2.97 h and 3.8 h in the light phase and dark phase, respectively. The reset increased the window of maximum lipid accumulation from 6 h to 12 h concomitant with the onset of the ultradian rhythms. Further, the saturated fatty acid content increased approximately to 80% of total lipid content, corresponding to the peak maxima of the hydroxyl radical levels in the reset rhythm.

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Section: Resultsmentioning

confidence: 74%

UVA‐induced reset of hydroxyl radical ultradian rhythm improves temporal lipid production in Chlorella vulgaris

Balan

Suraishkumar

2014

Biotechnology Progress

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“…In this case, growth stimulation was observed. Also, UVR photostress reduced the latency phase in Chlorella vulgaris (NIOT5 India) (Balan and Suraishkumar, 2014).…”

Section: Growth Of Pediastrum Sp After Par and Pab Radiationmentioning

confidence: 99%

“…This was higher than the control, in which UVB radiation generated an increase in the growth rate during the early growth phase. This is as a result of changes in the photosystem stoichiometry and the size of the antenna pigments (Balan and Suraishkumar, 2014).…”

Section: Growth Of Pediastrum Sp After Par and Pab Radiationmentioning

confidence: 99%

Effects of ultraviolet radiation on production of photoprotective compounds in microalgae of the genus Pediastrum from high Andean areas of Peru

Cecil¹,

Henriquez²,

Flores³

et al. 2022

J Appl Pharm Sci

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This study aims to collect microalgae from high Andean areas and evaluate their potential as natural ingredients in the cosmetics industry. The cell growth, pigment concentration, antioxidant activity, and polyphenols content of two microalgae of the genus Pediastrum (IMP-BG288 and IMP-BG255) collected from high Andean lagoons of more than 3,000 m.a.s.l. (Ayacucho, Peru) were evaluated. The cultures were exposed to photosynthetically active radiation (PAR) (400-700 nm) and PAR with ultraviolet radiation A and B (PAB) (280-700 nm) in 2 l photobioreactors. Cultures of the genus Pediastrum sp. subjected to PAB radiation showed greater growth until the sixth day, when they reached the end of their exponential phase. The maximum concentrations of lutein and chlorophyll a and b were 6.96 ± 0.21, 1.64 ± 0.05, and 0.84 ± 0.06 mg/g, respectively; total antioxidant activity and total polyphenol content were 221.7 ± 11.76 µmol eq. Trolox/g and 7.36 ± 0.53 mg GAE/g, respectively, after being subjected to PAR. Conclusively, high Andean microalgae possess adaptation mechanisms that help them to cope with a high radiation flux. The high concentrations of antioxidants and pigments in the strain taken from 4,400 m.a.s.l (IMP-BG288) suggest its greatest cosmetic potential.

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“…Fatty acids were identified by comparison with retention times of 37-component FAME mix standards (Sigma-Aldrich) and were expressed as mg/L. The corresponding fatty acids were further cross checked with the instrument database containing the NIST ® library [28].…”

Section: Fatty Acid Analysismentioning

confidence: 99%

The Effect of Chromium on Photosynthesis and Lipid Accumulation in Two Chlorophyte Microalgae

Bashir¹,

Lee²,

Mansoor

et al. 2021

Energies

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Heavy metals have adverse effects on microalgae metabolism and growth. Photosynthesis and lipid profile are quite sensitive to heavy metal toxicity. The impact of hexavalent chromium—Cr(VI) on photosynthesis and lipid accumulation in Mucidosphaerium pulchellum and Micractinium pusillum exposed to different concentrations (0–500 μg L−1) was investigated for 11 days. A significant (p < 0.05) increase in lipid content was observed with increasing Cr(VI) concentration. However, growth was suppressed at higher concentrations exceeding 100 μg L−1. Addition of Cr(VI) in the cell culture medium showed a negative effect on quantum yield (Fv/Fm), and a photosynthetic inhibition of >65% was noted in both species at 500 μg L−1. However, the lipid gravimetric analysis presented inner cell lipid content up to 36% and 30% of dry weight biomass for M. pulchellum and M. pusillum, respectively. The fatty acids profiles of both microalgae species showed higher levels of hexadecenoic acid as well as ω3, ω6, and ω7 fatty acids. The effect of Cr(VI) on photosynthesis and lipid accumulation in both microalgae species was concentration and exposure time dependent. This shows that an appropriate concentration of Cr(VI) in culture medium could be beneficial for higher lipid accumulation in freshwater eukaryotic microalgae species.

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Simultaneous increases in specific growth rate and specific lipid content of Chlorella vulgaris through UV‐induced reactive species

Cited by 13 publications

References 61 publications

UVA‐induced reset of hydroxyl radical ultradian rhythm improves temporal lipid production in Chlorella vulgaris

UVA‐induced reset of hydroxyl radical ultradian rhythm improves temporal lipid production in Chlorella vulgaris

Effects of ultraviolet radiation on production of photoprotective compounds in microalgae of the genus Pediastrum from high Andean areas of Peru

The Effect of Chromium on Photosynthesis and Lipid Accumulation in Two Chlorophyte Microalgae

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