Direct microbial conversion of wheat straw into lipid by a cellulolytic fungus of Aspergillus oryzae A-4 in solid-state fermentation

Lin, Hui; Wei, Cheng; Ding, Hongyan; XueJiao, Chen; Zhou, Qifa; Zhao, Yanfang

doi:10.1016/j.biortech.2010.04.027

Cited by 112 publications

(50 citation statements)

References 32 publications

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“…Concerning the conversion of cellulose into SCO, few papers have recently appeared in the international literature [57,58]. Sugar-based media such as simple sugars (e.g.…”

Section: Substrates Usedmentioning

confidence: 99%

Lipids of oleaginous yeasts. Part I: Biochemistry of single cell oil production

Papanikolaou

Aggelis

2011

Euro J Lipid Sci & Tech

577

496

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In the first part of this review, the biochemistry of lipid accumulation in the oleaginous microorganisms is depicted. Lipid biosynthesis form sugars and related substrates is a secondary anabolic activity, conducted after essential nutrient (usually nitrogen) depletion in the medium. Due to this exhaustion, the carbon flow is directed towards the accumulation of intracellular citric acid that is used as acetyl‐CoA donor in the cytoplasm. Acetyl‐CoA generates cellular fatty acids and subsequently triacylglycerols. Lipid accumulation from hydrophobic substrates is a growth associated process, being independent from nitrogen exhaustion in the medium. Medium fatty acids are incorporated with various incorporation rates and are either dissimilated for growth needs or become “substrate” for intracellular biotransformations. “New” fatty acid profiles (in both extra‐ and intracellular lipids) that did not previously exist in the medium are likely to be produced. Oleaginous microorganisms consume their own storage lipids when their metabolic abilities cannot be saturated by the extracellular carbon source. Reserve lipid breakdown is independent from the type of the carbon source used for lipid accumulation. In most cases it is accompanied by lipid‐free biomass production. Lipid mobilization is a specific process, as preferential degradation of the neutral lipid fractions is observed.

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“…Concerning the conversion of cellulose into SCO, few papers have recently appeared in the international literature [57,58]. Sugar-based media such as simple sugars (e.g.…”

Section: Substrates Usedmentioning

confidence: 99%

Lipids of oleaginous yeasts. Part I: Biochemistry of single cell oil production

Papanikolaou

Aggelis

2011

Euro J Lipid Sci & Tech

577

496

View full text Add to dashboard Cite

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“…In an attempt to clarify the relationship between the production of lipids and the secretion of cellulases using wheat bran as substrate, Hui et al [22] worked with Aspergillus oryzae A-4. They analyzed the use of the following different culture conditions: the inoculum size of 0.5 mL/g dry substrate, the proportion of straw meal 2:8, the fermentation volume 6 g, the substrate's proportion to the solution 4:7 and 25°C, and as a result, they obtained 2.31 U/g dry substrate with 148 h of SSF.…”

Section: Production Of Cellulolytic Enzymesmentioning

confidence: 99%

Cellulase Production by Aspergillus japonicus URM5620 Using Waste from Castor Bean (Ricinus communis L.) Under Solid-State Fermentation

Herculano

Porto

Moreira

et al. 2011

Appl Biochem Biotechnol

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The activity of β-glucosidase (βG), total cellulase (FPase) and endoglucanase (CMCase), produced by Aspergillus japonicus URM5620, was studied on solid-state fermentation using castor bean meal as substrate. The effect of the substrate amount, initial moisture, pH, and temperature on cellulase production was studied using a full factorial design (2(4)). The maximum βG, FPase, and CMCase activity was 88.3, 953.4, and 191.6 U/g dry substrate, respectively. The best enzyme activities for all three enzymes were obtained at the same conditions with 5.0 g of substrate, initial moisture 15% at 25 °C and pH 6.0 with 120 h of fermentation. The optimum activity for FPase and CMCase was found at pH 3.0 at an optimum temperature of 50 °C for FPase and of 55 °C for CMCase. The cellulases were stable in the range of pH 3.0-10.0 at 50 °C temperature. The enzyme production optimization demonstrated clearly the impact of the process parameters on the yield of the cellulolytic enzymes.

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“…In all the species, 0.4-1.4% eicosanoic acid and 0.6-2.7% of unsaturated fatty acids (palmitoleic and eicosenoic acids) were found. The cellulolytic fungus, Aspergillus oryzae A-4, yielded a lipid content of 36.6 mg g -1 dry substrate by direct microbial conversion of wheat straw in suspended cultures and 62.87 mg g -1 dry substrate in solid substrate fermentation under optimized conditions [91]. With peptone and glucose as C and N sources, M. rouxii and Mucor sp.…”

Section: Moldsmentioning

confidence: 99%

Microbial lipids from renewable resources: production and characterization

Ramalingam

Dufreche

Zappi

et al. 2010

J Ind Microbiol Biotechnol

266

147

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A number of microorganisms belonging to the genera of algae, yeast, bacteria, and fungi have ability to accumulate neutral lipids under specific cultivation conditions. The microbial lipids contain high fractions of polyunsaturated fatty acids and have the potential to serve as a source of significant quantities of transportation fuels. This paper reviews the current state of the art of this field. It summarizes the various microorganism used, feed stocks available, environmental factors that influence growth of cells and accumulation of lipids, major fatty acid composition of lipids, and the technology.

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Direct microbial conversion of wheat straw into lipid by a cellulolytic fungus of Aspergillus oryzae A-4 in solid-state fermentation

Cited by 112 publications

References 32 publications

Lipids of oleaginous yeasts. Part I: Biochemistry of single cell oil production

Lipids of oleaginous yeasts. Part I: Biochemistry of single cell oil production

Cellulase Production by Aspergillus japonicus URM5620 Using Waste from Castor Bean (Ricinus communis L.) Under Solid-State Fermentation

Microbial lipids from renewable resources: production and characterization

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