Light intensity affects tolerance of pyrene in Chlorella vulgaris  and Scenedesmus acutus

Tomar, Rupal Singh; ATRE, R.; Sharma, Deepa; Rai-Kalal, Prabha; Jajoo, Anjana

doi:10.32615/ps.2022.044

Cited by 7 publications

(2 citation statements)

References 45 publications

(43 reference statements)

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“…Furthermore, Dinev et al [ 52 ] studied extracts from S. dimorphus and found that a high antioxidant potential determined by the DPPH method correlated with elevated levels of total phenolic and flavonoid compounds. Increased phenolic production serves as a direct countermeasure against free radicals, interrupting the sequence of reactions in lipid peroxidation chain reactions [ 53 ]. Consistently, our study demonstrated enhanced antioxidant efficacy from low light at 100 μ mol photons m −2 ·s −1 to high light at 500 μ mol photons m −2 ·s −1 , along with increased TPC content.…”

Section: Discussionmentioning

confidence: 99%

Light Influences the Growth, Pigment Synthesis, Photosynthesis Capacity, and Antioxidant Activities in Scenedesmus falcatus

Songserm,

Nishiyama,

Sanevas

2024

Scientifica

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Light plays a significant role in microalgae cultivation, significantly influencing critical parameters, including biomass production, pigment content, and the accumulation of metabolic compounds. This study was intricately designed to optimize light intensities, explicitly targeting enhancing growth, pigmentation, and antioxidative properties in the green microalga, Scenedesmus falcatus (KU.B1). Additionally, the study delved into the photosynthetic efficiency in light responses of S. falcatus. The cultivation of S. falcatus was conducted in TRIS-acetate-phosphate medium (TAP medium) under different light intensities of 100, 500, and 1000 μmol photons m−2·s−1 within a photoperiodic cycle of 12 h of light and 12 h of dark. Results indicated a gradual increase in the growth of S. falcatus under high light conditions at 1000 μmol photons m−2·s−1, reaching a maximum optical density of 1.33 ± 0.03 and a total chlorophyll content of 22.67 ± 0.2 μg/ml at 120 h. Conversely, a slower growth rate was observed under low light at 100 μmol photons m−2·s−1. However, noteworthy reductions in the maximum quantum yield (Fv/Fm) and actual quantum yield (Y(II)) were observed under 1000 μmol photons m−2·s−1, reflecting a decline in algal photosynthetic efficiency. Interestingly, these changes under 1000 μmol photons m−2·s−1 were concurrent with a significant accumulation of a high amount of beta-carotene (919.83 ± 26.33 mg/g sample), lutein (34.56 ± 0.19 mg/g sample), and canthaxanthin (24.00 ± 0.38 mg/g sample) within algal cells. Nevertheless, it was noted that antioxidant activities and levels of total phenolic compounds (TPCs) decreased under high light at 1000 μmol photons m−2·s−1, with IC50 of DPPH assay recorded at 218.00 ± 4.24 and TPC at 230.83 ± 86.75 mg of GAE/g. The findings suggested that the elevated light intensity at 1000 μmol photons m−2·s−1 enhanced the growth and facilitated the accumulation of valuable carotenoid pigment in S. falcatus, presenting potential applications in the functional food and carotenoid industry.

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Section: Discussionmentioning

confidence: 99%

Light Influences the Growth, Pigment Synthesis, Photosynthesis Capacity, and Antioxidant Activities in Scenedesmus falcatus

Songserm,

Nishiyama,

Sanevas

2024

Scientifica

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“…Results by Tomar et al (2023) unveil that in Chlorella vulgaris and Scenedesmus acutus light intensity impacts the toxicity of pyrene (PYR), a 4-ring polycyclic aromatic hydrocarbon. In the presence of PYR, S. acutus grew well in both low light (LL) and high light (HL) intensity.…”

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confidence: 99%