Optical, Photophysical, Stability and Mirrorless Lasing Properties of Novel Fluorescein Derivative Dye in Solution

Abou-Kana, Maram T. H.

doi:10.4236/ojapps.2012.24034

Cited by 8 publications

(1 citation statement)

References 44 publications

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“…The dyes have high quantum efficiency, wide absorption and narrow emission bands, high absorption coefficients, and show good separation between the absorption and emission bands (Khoobkar & Delavari Amrei, 2020). As incident radiation passes through an organic dye, it is absorbed by the luminescent species, converted, and then emitted as light with a higher potential for photosynthesis (Abou-Kana, 2012;Hassan & Al-Hamdani, 2014). The electrons produced by photosynthesis have several allocations: functional biomass (mainly proteins), storage molecules (carbohydrates and lipids), maintenance, and respiration (Nwoba, et al, 2019;Sathasivam, et al, 2019;Najafpour, et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Enhancing C. reinhardtii growth and metabolite biosynthesis using organic dyes as spectral convertors

Ramanna

Nasr

Rawat

et al. 2023

Preprint

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The commercial success of microalgal systems has to a large extent been restricted due to limited light availability and utilisation. Algae utilize the blue and red spectral regions, large amounts of the incoming light energy fall outside this region and remain unused. The spectral conversion of unusable to usable wavelengths will increase the amount of radiation available for photosynthesis. This study was conducted to determine the optimum organic dye among Lumogen Red (LR), Rhodamine 8G (R8G), and Lumogen Yellow (LY) as spectral converters, providing the best light utilisation efficiency in an algal system. The microalga Chlamydomonas reinhardtii was cultivated in double-jacketed cylindrical photo-bioreactors (PBRs) stimulated using 30% UV-a and 5% UV-b fluorescent tubes. Carbohydrate and lipid contents were produced early in the growth phase, whereas biomass and protein content increased after day 4. The LR dye maintained better photo-stability compared to R8G and LY, which displayed a slight wavelength shift and photo-degradation, respectively. The improved biomass production in the LR-assisted PBR was illustrated by increased Y(II), with decreasing Y(NPQ), total chlorophylls, and carotenoids. Pigment biosynthesis was initially increased and then reduced to compensate for the increased irradiation as a means of photoprotection. Gene expression studies showed that algae grown under LR had a 1.6- and 2.9-fold up-regulation of the RuBisCo gene. The applicability of the dye-based algal system was linked to enhanced growth, lipid, protein, carbohydrate, and pigment productions. Moreover, the environmental, economic, and social aspects of improving microalgal cultivation using dye-based wavelength conversion systems were interlinked to the sustainable development goals.

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Section: Introductionmentioning

confidence: 99%

Enhancing C. reinhardtii growth and metabolite biosynthesis using organic dyes as spectral convertors

Ramanna

Nasr

Rawat

et al. 2023

Preprint

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Enhancing Chlamydomonas reinhardtii growth and metabolite biosynthesis using organic dyes as spectral converters

Ramanna,

Nasr,

Rawat

et al. 2024

J Appl Phycol

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The availability of light and its efficient utilisation is a major limiting factor in large scale algal cultures. While algae predominantly use the blue and red spectral regions, a significant amount of incoming light energy remains untapped outside these ranges. Converting this unused light into usable wavelengths could enhance photosynthesis. This study aimed to identify the optimal spectral converter among Lumogen Red (LR), Rhodamine 8G (R8G), and Lumogen Yellow (LY), providing efficient light utilisation for algal cultivation. Chlamydomonas reinhardtii was cultivated in double-jacketed cylindrical photo-bioreactors (PBRs) using 30% UV-a and 5% UV-b fluorescent tubes. The R8G dye displayed a slight wavelength shift with a sharp peak at about 498 nm. The LY dye demonstrated several sharp peaks at the green and blue light spectra evident of photo-degradation. The LR dye maintained better photo-stability compared to R8G and LY. Carbohydrate, lipid and protein were produced early, whereas biomass increased after day 4, as a result of photo-acclimation. The LR dye converted and emitted 3.17 × 10-19 J photon-1, enhancing biomass production and increasing photochemical energy utilisation [Y(II)] while decreasing regulated energy dissipation [Y(NPQ)]. Pigment biosynthesis was initially increased and then reduced to counteract heightened irradiation as a means of photo-protection. LR had a 1.6- and 2.9-fold up-regulation of the RuBisCo gene expression. The dye-based system correlated with improved growth, lipid, protein, carbohydrate, and pigment production. The dye-based wavelength conversion system was interlinked to the sustainable development goals addressing environmental, economic, and social aspects.

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Fluorescein Dyes

Ziarani¹,

Moradi²,

Lashgari³

et al. 2018

Metal-Free Synthetic Organic Dyes

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Optical, Photophysical, Stability and Mirrorless Lasing Properties of Novel Fluorescein Derivative Dye in Solution

Cited by 8 publications

References 44 publications

Enhancing C. reinhardtii growth and metabolite biosynthesis using organic dyes as spectral convertors

Enhancing C. reinhardtii growth and metabolite biosynthesis using organic dyes as spectral convertors

Enhancing Chlamydomonas reinhardtii growth and metabolite biosynthesis using organic dyes as spectral converters

Fluorescein Dyes

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