Distillers' dried grains with solubles (DDGS) and its potential as fermentation feedstock

Iram, Attia
Çekmecelioğlu, Deniz
Demirci, Ali
Distillers' dried grain with solubles (DDGS) is a byproduct of bioethanol fermentation, which uses the dry milling technology for starch-rich grains such as corn, wheat, and barley. The current interest in bioethanol is increasing due to the need for renewable liquid fuels specifically in the transportation sector. Since DDGS is rich in crude protein, fat, fiber, vitamins, and minerals, it is currently used as aquaculture, livestock, and poultry feeds. In recent years, DDGS has been used as feedstock in the production of value-added products via microbial fermentation. Numerous studies reported the production organic acids, methane, biohydrogen, and hydrolytic enzymes using DDGS. While DDGS contains remarkable amounts of macronutrients, pre-treatment of DDGS is required for release of the fermentable sugars. The pre-treatment methods such as chemical, physical, and biological origin are either solely used or combined to obtain maximal yields for different applications. Therefore, this review summarizes some of the most prominent pre-treatment processes generating high fermentable sugar yields for the productions of value-added products in the last 5 years. A special focus has been given to the effect of the variability of DDGS on the final product. Integration of hydrolytic enzyme production with the traditional bioethanol production facilities has been discussed for further improvement of bioethanol, methane, and biohydrogen using DDGS as fermentation feedstock.


OZADALI, F; OZILGEN, M (Springer Science and Business Media LLC, 1988-09-01)
Fed-batch fermenters are generally operated with the addition of small doses of nutrients, therefore the volume of the fermentation broth increases with time. Batch fermenters generally contain and almost constant volume of broth and a logistic equation has been commonly employed to simulate microbial growth in them. Mass balances were determined with fed-batch fermentation to obtain expressions which account for the effect of volume increase and the subsequent dilution of the biomass. A growth rate express...
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Wine is an important source of dietary antioxidants, due to its content of phenolic compounds. Amount of phenolics in red wines of Turkey were investigated by using electrodes prepared via immobilisation of tyrosinase. Immobilisation was performed by entrapment during electrochemical synthesis of conducting copolymers. Results were compared with Folin-Ciocalteau method. It was found that use of enzyme electrodes is an alternative and cheap method in determining the phenolics in wines. Storage temperature be...
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Avcioglu, B; Eyupoglu, B; Bakir, U (Springer Science and Business Media LLC, 2005-02-01)
Xylanase production was performed by growing a Bacillus isolate on agricultural by-products, wheat straw, wheat bran, corn cobs and cotton bagasse. A maximum xylanase activity of 180 U/ml was obtained together with a cellulase activity of 0.03 U/ml on 4 (w/v) corn cobs. Electrophoretic analysis showed the presence of three endo-beta-1, 4-xylanases having molecular weights of about 22, 23 and 40 kDa. Xylanolytic activity was stable up to 50degreesC in the pH range of 4.5-10 and the highest activity was obser...
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The kinetics of riboflavin production by Saccharomyces cerevisiae and Saccharomyces carlsbergensis in synthetic media and wort were studied. The results indicated that riboflavin was produced by growing cells only. Riboflavin production rate was proportional to growth rate of the yeasts in the exponential phase. Riboflavin was depleted in the stationary phase. The depletion rate was expressed with a first-order kinetic expression in yeast concentration. The kinetics of substrate utilization and ethanol prod...
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Barley is one of the most important crop species in Turkey and powdery mildew is one of the most common pathogen decreasing yield in barley. For this problem, agricultural biologists apply breeding technologies in order to select and propagate resistant barley cultivars. However, this is not a permanent solution since pathogens evolve rapidly to overcome plant resistance mechanisms. On the other hand, molecular plant pathologists are trying to understand basic mechanisms underlying plant-pathogen interactio...
Citation Formats
A. Iram, D. Çekmecelioğlu, and A. Demirci, “Distillers’ dried grains with solubles (DDGS) and its potential as fermentation feedstock,” APPLIED MICROBIOLOGY AND BIOTECHNOLOGY, pp. 6115–6128, 2020, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48049.