Effect of pH on growth and biochemical responses of Dunaliella bardawil and Chlorella ellipsoidea

Khalil, Z.; Asker, Mohsen S.; El-Sayed, Salwa M.; Kobbia, I. A.

doi:10.1007/s11274-009-0292-z

Cited by 139 publications

(49 citation statements)

References 37 publications

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“…The change in carbohydrate content in response to pH change is species specific as well. The maximum accumulation of carbohydrate was reported for Skeletonema costatum at pH 7 (Taraldsvik and Myklestad 2000), for Dunaliella bardawil at pH 7.5 and Chlorella ellipsoidea at pH 9 (Khalil et al 2009). …”

Section: Phmentioning

confidence: 90%

Microalgae as a Feedstock for Biofuel Precursors and Value-Added Products: Green Fuels and Golden Opportunities

Tang¹,

Rosenberg²,

Bohutskyi³

et al. 2015

BioResources

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The prospects of biofuel production from microalgal carbohydrates and lipids coupled with greenhouse gas mitigation due to photosynthetic assimilation of CO2 have ushered in a renewed interest in algal feedstock. Furthermore, microalgae (including cyanobacteria) have become established as commercial sources of value-added biochemicals such as polyunsaturated fatty acids and carotenoid pigments used as antioxidants in nutritional supplements and cosmetics. This article presents a comprehensive synopsis of the metabolic basis for accumulating lipids as well as applicable methods of lipid and cellulose bioconversion and final applications of these natural or refined products from microalgal biomass. For lipids, one-step in situ transesterification offers a new and more accurate approach to quantify oil content. As a complement to microalgal oil fractions, the utilization of cellulosic biomass from microalgae to produce bioethanol by fermentation, biogas by anaerobic digestion, and bio-oil by hydrothermal liquefaction are discussed. Collectively, a compendium of information spanning green renewable fuels and value-added nutritional compounds is provided.

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Section: Phmentioning

confidence: 90%

Microalgae as a Feedstock for Biofuel Precursors and Value-Added Products: Green Fuels and Golden Opportunities

Tang¹,

Rosenberg²,

Bohutskyi³

et al. 2015

BioResources

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“…If the goal is astaxanthin production, the increase in light intensity must be performed gradually to avoid a significant decrease in productivity. The evaluation and control of pH in the culture medium is of great importance because the concentration of hydrogen ions is one of the most important factors that can affect the growth of algae cells [16]. The concentration of hydrogen ions influences the metabolism of the microorganisms and thus deter-mines the biosynthesis of secondary metabolites such as the astaxanthin product.…”

Section: Autoregressive Model For the Prediction Of Dynamic Behavior mentioning

confidence: 99%

Modeling of Biomass Production of Haematococcus pluvialis

Galvão¹,

Santana²,

Fontes

et al. 2013

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Microalgae cultivation is justified by the production of high-value fine chemicals and biofuels, essential to reduce the emissions of gases that cause global warming. This paper presents a study of the growth of microalgae Haematococcus pluvialis considering light conditions from 2000 to 10,000 lux, temperature 22˚C and pH in the 6.5 -12.5 range. The experiments were performed in 4 liter flat plate photobioreactors using the Rudic culture medium. The biomass growth was measured by counting cells in a Neubauer chamber. Both the light intensity and the pH of the medium influenced the rate of growth of the microalgae. A model with exponential behavior was proposed to describe the production of microalgae biomass over time. A nonlinear autoregressive model based on an Artificial Neural Network was used to predict the dynamic behavior of the pH during the growth of the microalgae at different light intensities. Simulations were carried out to analyze the behavior of biomass production at other light intensities within the range considered.

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“…Although Dunaliella species has a wide range of pH tolerance but for its optimum growth and biopigment content pH 8 was found optimum 14 . It was reported that at higher pH, there is a risk of precipitation by calcium salts and flocculation of algal biomass 15 .…”

mentioning

confidence: 99%

Untitled

2017

IJPSR

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ABSTRACT:A study was conducted to investigate the effect of different pH, on the growth and biopigment accumulation of a green alga Dunaliella salina isolates from Sambhar salt lake, Rajasthan (India). In order to monitor the impact of pH an algal samples of D. salina was exposed to different pH regimes (6 -10 pH) along with control (8.5 pH) over a period of 30 days. Set of experiments was conducted to study and evaluate the optimum growth and biopigment content for D.salina. The results of this experiment showed that optimum growth of D.salina was found at pH 8. Total chlorophyll content of the algal species decreases as the pH value was increased. While total carotenoids content of the algal species increases as the increases pH values and it was found that the green alga species changed its appearance from green to deep orange. The results indicate that algal species showed diverse response to pH stress.

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Effect of pH on growth and biochemical responses of Dunaliella bardawil and Chlorella ellipsoidea

Cited by 139 publications

References 37 publications

Microalgae as a Feedstock for Biofuel Precursors and Value-Added Products: Green Fuels and Golden Opportunities

Microalgae as a Feedstock for Biofuel Precursors and Value-Added Products: Green Fuels and Golden Opportunities

Modeling of Biomass Production of Haematococcus pluvialis

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