Preliminary screening of some fungal strains for protein upgrading of sugar-beet pulp

Bajon, A. M.; Yuen, Tina; Fong, Jamie; Olàh, G. M.

doi:10.1007/bf01027820

Cited by 10 publications

(1 citation statement)

References 7 publications

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“…Actinomucor elegans Hang, 1976 Aspergillus fumigatus Khor et al, 1977;Reade and Gregory, 1975 Aspergillus niger Christias et al, 1975;Hang, 1976;Oboh et al, 2002;Singh et al, 1991 Aspergillus oryzae Hang, 1976 Candida lipolytica Achermowicz et al, 1977 Candida tropicalis Achermowicz et al, 1977;Christias et al, 1975 Candida utilis Villas-Boas et al, 2003 Chaetomium globosum Hang, 1976 Fusarium moniliforme Christias et al, 1975;Drouliscos et al, 1976 Fusarium oxysporum Sukara and Doelle, 1989 Fusarium venenatum Anderson and Solomons, 1984;Trinci, 1992 Geotrichum candidum Robinson and Smith, 1984;Ziino et al, 1999 Pestalotriopsis westerdijkii Hang, 1976 Phanerochaete chrysosporium Cardoso and Nicoli, 1981 Rhizopus oligosporus Sukara and Doelle, 1989 Thielavia terrestris Bajon et al, 1985;Stevens and Gregory, 1987 Trichoerma viride Hang, 1976;Youssef and Aziz, 1999 a References collected by Thrane (2007).…”

Section: Filamentous Fungi and Yeast Reference Amentioning

confidence: 99%

Enhancing dry-grind corn ethanol production with fungal cultivation and ozonation

Rasmussen

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Dry-grind corn ethanol plants, the backbone of a rapidly expanding biofuel industry, generate copious amounts of stillage, the leftovers from fermentation followed by distillation. Most thin stillage is currently concentrated by flash evaporation-an energy-intensive process-blended with distillers grains, and dried to produce distillers dried grains with solubles (DDGS). Thin stillage is generated in pasteurized condition and is rich in nutrients, with a chemical oxygen demand (COD) up to 100 g/L. The initial pH of 4 and high organic content make it an ideal feedstock for fungal cultivation. This research cultivated the food-grade fungus Rhizopus microsporus var. oligosporus on thin stillage from a local dry-grind corn ethanol plant. Batch experiments in 5-and 50-L stirred bioreactors showed prolific fungal growth under non-sterile conditions. COD, glycerol, and organic acids 65 removals, critical for in-plant water reuse, reached 80, 100, and 100%, respectively, within 5 d of fungal inoculation. The initial 20-30 g/L suspended solids decreased to nearly non-detectable levels, enabling effluent recycle as process water. The fungus contains 2% lysine and 2% methionine (corn contains 0.3% and 0.2%, respectively) and 43% crude protein, enhancing the nutritional value as a poultry and livestock feed. With minimal pretreatment, the fungal biomass could be co-fed with distillers grains to nonruminants-swine and poultry. Avoiding water evaporation from thin stillage would save substantial energy inputs in corn ethanol plants.

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Section: Filamentous Fungi and Yeast Reference Amentioning

confidence: 99%

Enhancing dry-grind corn ethanol production with fungal cultivation and ozonation

Rasmussen

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Screening and selection of microfungi for microbial biomass protein production and water reclamation from starch processing wastewater

Jin

Leeuwen

Qian

et al. 1999

J. Chem. Technol. Biotechnol.

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: Thirty strains of microfungi and amylolytic yeasts were screened for production of microbial biomass protein (MBP) and water reclamation from starch processing wastewater (SPW). Three species and six strains of microfungi Aspergillus oryzae, Rhizopus oligosporus and Rhizopus arrhizus showing high enzymatic activities on SWP were selected under non-aseptic growth conditions. In 20 h submerged cultivation the selected strains had a high capacity to enzymatically hydrolyse more than 93% of the starch and produce 4.3-5.6 g dm-3 of dry biomass at a speciüc biomass growth rate from 0.05 to 0.12 h-2. The fungal biomass contained crude protein ranging from 37.5 to 49.8% of dry biomass. The pellet and ýocculated biomass products were easily harvested by simple ültration or sedimentation. After these processes, 76-88% of total organic carbon (TOC), 85% -92% of chemical oxygen demand (COD) and 95% suspended solids in SPW were removed, and the treated water was reusable for farm irrigation. Typical pretreatment processes including hydrolysis, sterilisation and nutrient supplementation were unnecessary.

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Production of protein by thermophilic fungi from sugar‐beet pulp in solid‐state fermentation

Grajek¹

1988

Biotech & Bioengineering

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Conversion of lignocellulosic plant materials into protein by microorganisms is a process of increasing importance for the future. The organic biomass produced by photosynthesis is estimated at 163 X lo9 tons annually, and over half of this is in the form of cellulose and hemicelluloses. Management of these raw materials is difficult, however, because of the seasonal variation in plant vegetation and its territorial dispersion. For these reasons, waste materials from agriculture and forestry are attractive, such as cereal straw, bagasse, sugar-beet pulp, residual plant materials, and wastepaper.Conversion of lignocellulose into microbial protein can be realized by two different methods. The first is direct cultivation of microorganisms on pretreated cellulosic substrates, while the second is a multistep process with chemical or enzymatic hydrolysis of polysaccharides followed by fermentation of the hydrolysate. Each of these methods has advantages and disadvantages. The direct cultivation of microorganisms on cellulosics is simple and relatively inexpensive, but the final product, because of its undigestible fraction, has limited application in animal feeds. The production of microbial biomass using cellulose hydrolysates is more complicated and requires development of an economical method of cellulose hydrolysis. The final fermentation product is of high quality and can be used for nutrition of monogastric animals and, after special treatment, can be a source of protein for human nutrition.In the past, the majority of investigations on the direct production methods of single-cell protein were concerned with producing the fungal or bacterial biomass in submerged cultures. Recently, more attention has been given to solid-state fermentation (SSF), which is a very convenient method for utilization of bulk waste materials from both agriculture and forestry. Unfortunately, the technical and technological level of SSF in comparison with the submerged technique is inferior at present.The most important difficulties are the control and the regulation of culture conditions and, in particular, the homogenity of the medium and the regulation of pH, tempera- ture, and moisture. One way to overcome these difficulties is to use specially selected thermophilic micro-organisms .The ability to carry out the fermentation process at elevated temperatures has many advantages, such as a reduction in the contamination hazards and cooling costs, and a decrease in the culture duration as the result of accelerated metabolism of thermophilic microorganisms. This communication is concerned with the utility of thermophilic fungi for conversion of cellulosic substances to protein in solidstate fermentation.Sugar-beet pulp was chosen as a cellulosic substrate as its physicochemical structure was considered suitable for the SSF process. The widespread production of sugar beets in some countries and the current high level of stock in the sugar industry suggest the possibility of real industrial applications. MATERIALS AND METHODS Microorganism...

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Preliminary screening of some fungal strains for protein upgrading of sugar-beet pulp

Cited by 10 publications

References 7 publications

Enhancing dry-grind corn ethanol production with fungal cultivation and ozonation

Enhancing dry-grind corn ethanol production with fungal cultivation and ozonation

Screening and selection of microfungi for microbial biomass protein production and water reclamation from starch processing wastewater

Production of protein by thermophilic fungi from sugar‐beet pulp in solid‐state fermentation

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