Bioconversion of Glycerol into Biofuels—Opportunities and Challenges

Chilakamarry, Chaitanya Reddy; Sakinah, A. M. Mimi; Zularisam, A. W.; Sirohi, Ranjna; Khilji, Irshad Ahamad; Venugopal, Jayarama Reddy; Pandey, Ashok

doi:10.1007/s12155-021-10353-6

Cited by 25 publications

(13 citation statements)

References 123 publications

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“…Regarding the oxidative pathway (Branch A, Figure 4 ), the first step consists of the oxidation of glycerol to dihydroxyacetone through FAD/NAD dehydrogenase. Dihydroxyacetone is phosphorylated by a dihydroxyacetone kinase, producing dihydroxyacetone phosphate [ 6 ]. The other alternative reaction involves the enzyme 3-phosphoglycerate dehydrogenase (NAD-dependent), which catalyses the conversion of glycerol-3-phosphate into dihydroxyacetone phosphate in the mitochondria [ 44 ].…”

Section: Production Of Yeast Oils From Organic Industrial Byproducts/...mentioning

confidence: 99%

“…Liquid biofuels play a central role in that transition, in particular biodiesel which is considered an ideal candidate for the replacement of petroleum-derived diesel due to its high cetane number and flash point and the possibility to be used in any compression-ignition engine without the need for modification [ 3 , 4 ]. Biodiesel results from the reaction of one triacylglycerol molecule (consisting of three long-chain fatty acids attached to glycerol) with three alcohol molecules (usually methanol or ethanol) to produce three biodiesel molecules, i.e., methyl esters or ethyl esters, and one glycerol molecule [ 5 , 6 ]. Biodiesel is currently mainly produced through the transesterification of oils, in particular vegetable oils (including edible oils) or animal fats [ 7 ].…”

Section: Introductionmentioning

confidence: 99%

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Exploring Yeast Diversity to Produce Lipid-Based Biofuels from Agro-Forestry and Industrial Organic Residues

Mota

Múgica²,

Correia

2022

JoF

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Exploration of yeast diversity for the sustainable production of biofuels, in particular biodiesel, is gaining momentum in recent years. However, sustainable, and economically viable bioprocesses require yeast strains exhibiting: (i) high tolerance to multiple bioprocess-related stresses, including the various chemical inhibitors present in hydrolysates from lignocellulosic biomass and residues; (ii) the ability to efficiently consume all the major carbon sources present; (iii) the capacity to produce lipids with adequate composition in high yields. More than 160 non-conventional (non-Saccharomyces) yeast species are described as oleaginous, but only a smaller group are relatively well characterised, including Lipomyces starkeyi, Yarrowia lipolytica, Rhodotorula toruloides, Rhodotorula glutinis, Cutaneotrichosporon oleaginosus and Cutaneotrichosporon cutaneum. This article provides an overview of lipid production by oleaginous yeasts focusing on yeast diversity, metabolism, and other microbiological issues related to the toxicity and tolerance to multiple challenging stresses limiting bioprocess performance. This is essential knowledge to better understand and guide the rational improvement of yeast performance either by genetic manipulation or by exploring yeast physiology and optimal process conditions. Examples gathered from the literature showing the potential of different oleaginous yeasts/process conditions to produce oils for biodiesel from agro-forestry and industrial organic residues are provided.

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Section: Production Of Yeast Oils From Organic Industrial Byproducts/...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Exploring Yeast Diversity to Produce Lipid-Based Biofuels from Agro-Forestry and Industrial Organic Residues

Mota

Múgica²,

Correia

2022

JoF

View full text Add to dashboard Cite

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“…Glycerol is one of the main by‐products from biodiesel production. With the increasing demand for renewable fuels from biomass, the glycerol availability increased significantly [8,9] . This bio‐glycerol can be a sustainable, bio‐based feedstock for commodity chemicals.…”

Section: Introductionmentioning

confidence: 99%

“…With the increasing demand for renewable fuels from biomass, the glycerol availability increased significantly. [8,9] This bio-glycerol can be a sustainable, bio-based feedstock for commodity chemicals. Contaminants in glycerol from biodiesel production, such as water and alkali ions, can be detrimental for catalyst stability in many catalytic systems.…”

Section: Introductionmentioning

confidence: 99%

Formate Over‐Oxidation Limits Industrialization of Glycerol Oxidation Paired with Carbon Dioxide Reduction to Formate

et al. 2023

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Electrocatalytic CO 2 reduction processes are generally coupled with the oxidation of water. Process economics can greatly improve by replacing the water oxidation with a more valuable oxidation reaction, a process called paired electrolysis. Here we report the feasibility of pairing CO 2 reduction with the oxidation of glycerol on Ni 3 S 2 /NF anodes to produce formate at both anode and cathode. Initially we optimized the oxidation of glycerol to maximize the Faraday efficiency to formate by using design of experiments. In flow cell electrolysis, excellent selectivity (up to 90 % Faraday efficiency) was achieved at high current density (150 mA/cm 2 of geometric surface area). Then we successfully paired the reduction of CO 2 with the oxidation of glycerol. A prerequisite for industrial application is to obtain reaction mixtures with a high concentration of formate to enable efficient downstream separation. We show that the anodic process is limited in formate concentration, as Faraday efficiency to formate greatly decreases when operating at 2.5 M formate (~10 w%) in the reaction mixture due to over-oxidation of formate. We identify this as a major bottleneck for the industrial feasibility of this paired electrolysis process.

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“…Biomass and bioenergy have recently gained increased attention because of the depletion of crude oil and environmental issues created by the growing usage of oil and its derivatives [1,2]. As a result, research and development e orts should focus on ecologically friendly and renewable alternatives [3].…”

Section: Introductionmentioning

confidence: 99%

Glycerol Waste to Bio-Ethanol: Optimization of Fermentation Parameters by the Taguchi Method

Chilakamarry

Sakinah

Zularism

et al. 2022

Journal of Chemistry

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Global attention caused by pollutants and greenhouse gas emissions leads to alternative fuels that decrease the dependence on fossil fuels and reduce the carbon footprint that preceded the development of biodiesel production. Glycerol residue is generated more significantly from the biodiesel industry as a byproduct and is left as waste. In this study, we utilized glycerol residue from the biodiesel industry as an excellent opportunity to convert ethanol by bioconversion. The waste glycerol was used as a good and cheap carbon source as a substrate to synthesize ethanol by immobilizing E. coli cells. The screening of parameters such as mass substrate, temperature, inoculum size, and fermentation time was carried out using the one-factor-at-a-time (OFAT) technique. The Taguchi model employed optimization of fermentation parameters. The process parameters showed the mass substrate glycerol of 20 g with an inoculum size of 20%, and 12 hours yielded the ethanol concentration of 10.0 g/L.

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Bioconversion of Glycerol into Biofuels—Opportunities and Challenges

Cited by 25 publications

References 123 publications

Exploring Yeast Diversity to Produce Lipid-Based Biofuels from Agro-Forestry and Industrial Organic Residues

Exploring Yeast Diversity to Produce Lipid-Based Biofuels from Agro-Forestry and Industrial Organic Residues

Formate Over‐Oxidation Limits Industrialization of Glycerol Oxidation Paired with Carbon Dioxide Reduction to Formate

Glycerol Waste to Bio-Ethanol: Optimization of Fermentation Parameters by the Taguchi Method

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