Flaking as a corn preparation technique for dry-grind ethanol production using raw starch hydrolysis

Lamsal, Buddhi P.; Johnson, Louise

doi:10.1016/j.jcs.2012.02.008

Cited by 6 publications

(8 citation statements)

References 19 publications

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“…The ethanol production rate with protease and phytase addition increased to 1.16 g/ 100 g dry corn per hour, with final ethanol yield of 127.54 ± 0.17 g/L ( Table 1). Degradation of protein with enzyme in corn cell matrix can increase the accessibility of starch and other substrates to enzymes (Lamsal and Johnson, 2012). In addition, mineral supplement from phytic acid degradation could improve efficiency of ethanol production by making more ion (Ca 2+ ) available for glucoamylase activity (Hruby, 2012).…”

Section: Fermentation Performancementioning

confidence: 99%

“…Technologies for corn oil recovery from dry grind process are reported in the literature. Effect of physical treatments like grinding and flaking (Lamsal and Johnson, 2012), heating and solvent introduction before and after the corn dry-grind process (Majoni et al, 2011a;Wang 2008a;Wang et al, 2009a) were reported to enhance process performance. Use of hydrolytic enzymes is an environment-friendly and affordable method that can benefit corn dry-grind process (Johnston and McAloon, 2014), including recovery of corn oil (Majoni et al, 2011b).…”

Section: Introductionmentioning

confidence: 99%

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Addition of cellulolytic enzymes and phytase for improving ethanol fermentation performance and oil recovery in corn dry grind process

Luangthongkam

Fang

Noomhorm

et al. 2015

Industrial Crops and Products

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a b s t r a c tApplication of hydrolytic and other enzymes for improving fermentation performance and oil recovery in corn dry-grind process was optimized. Non-starch polysaccharide enzymes (BluZy-P XL; predominantly xylanase activity) were added at stages prior to fermentation at optimum conditions of 50 • C and pH 5.2 and compared with conventional fermentation (30 • C, pH 4.0). Enzyme applications resulted in faster ethanol production rates with a slight increase in yield compared to control. The thin stillage yield increased by 0.7-5% w/w wet basis with corresponding increase in solids content with enzyme treatment after liquefaction. The oil partitioned in thin stillage was at 67.7% dry basis after treatment with hydrolytic enzymes during fermentation. Further addition of protease and phytase during simultaneous saccharification and fermentation increased thin stillage oil partitioning to 77.8%. It also influenced other fermentation parameters, e.g., ethanol production rate increased to 1.16 g/g dry corn per hour, and thin stillage wet solids increased by 2% w/w. This study indicated that treatments with non-starch hydrolytic enzymes have potential to improve the performance of corn dry-grind process including oil partitioning into thin stillage. The novelty of this research is the addition of protease and phytase enzymes during simultaneous saccharification and fermentation of corn dry-grind process, which further improved ethanol yields and oil partitioning into thin stillage.

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Section: Fermentation Performancementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Addition of cellulolytic enzymes and phytase for improving ethanol fermentation performance and oil recovery in corn dry grind process

Luangthongkam

Fang

Noomhorm

et al. 2015

Industrial Crops and Products

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“…1). The hammer mill was known to generate the least shear force during grinding (Lamsal and Johnson 2012) and, thus, resulted in less damaged starch while producing finer particles than the ultra-centrifugal mill except for sample C. The volume-weighted mean diameters, D(4,3), of all ground corn are presented in Table II.…”

Section: Resultsmentioning

confidence: 99%

“…Finely ground corn provides larger surface area for amylolytic enzyme reactions (Lewis et al 2005). Some types of mills (attrition/disk-type grinders and flaking roller mills) provide both shearing and crushing actions to rupture cell wall materials and protein matrix in corn endosperm (Lamsal and Johnson 2012). Many types of mills can be used for particle size reduction of corn grains (e.g., a roller mill, a hammer mill, a cyclone mill, and a rotor mill).…”

mentioning

confidence: 99%

“…A high-speed rotating steel hammer forces the material to be crushed or shattered by impact action mainly. Some types of mills (attrition/disk-type grinders and flaking roller mills) provide both shearing and crushing actions to rupture cell wall materials and protein matrix in corn endosperm (Lamsal and Johnson 2012). Different mill types produced ground corn with different particle-size distributions (Lemuz et al 2009).…”

mentioning

confidence: 99%

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Effects of Different Mill Types on Ethanol Production Using Uncooked Dry‐Grind Fermentation and Characteristics of Residual Starch in Distiller's Dried Grains (DDG)

Wongsagonsup

Jane

2017

Cereal Chem

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Cereal Chem. 94(4):645-653This study aimed to investigate impacts of milling methods on ethanol production using an uncooked dry-grind (cold fermentation) process and characterize residual starch in the distiller's dried grains (DDG) coproduct. Four corn lines with different chemical compositions were ground with cyclone, ultra-centrifugal, or hammer mills equipped with a screen of 0.5 mm opening and used for the cold fermentation process. Greater starch hydrolysis and ethanol yield were obtained from cyclone-milled corn, resulting from larger damaged starch contents and smaller particle sizes of the ground corn. Corn grains and ground corn after five-month storage showed less starch hydrolysis than the freshly ground counterpart. Residual starch (2.8-8.0%) with large proportions of intact amylopectin contents (up to 42.5%) was found in the DDG from all types of milling. The results suggested that the entrapment of starch granules in ground corn and a low activity of amylolytic enzymes at a high ethanol concentration were accountable for the remaining of starch in the DDG. † Corresponding

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Development of multigrain extruded flakes and their sensory analysis using fuzzy logic

et al. 2019

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Flaking as a corn preparation technique for dry-grind ethanol production using raw starch hydrolysis

Cited by 6 publications

References 19 publications

Addition of cellulolytic enzymes and phytase for improving ethanol fermentation performance and oil recovery in corn dry grind process

Addition of cellulolytic enzymes and phytase for improving ethanol fermentation performance and oil recovery in corn dry grind process

Effects of Different Mill Types on Ethanol Production Using Uncooked Dry‐Grind Fermentation and Characteristics of Residual Starch in Distiller's Dried Grains (DDG)

Development of multigrain extruded flakes and their sensory analysis using fuzzy logic

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