Growth and Batch Ethanol Fermentation of Saccharomyces cerevisiae on 
 Sweet Sorghum Stem Juice under Normal and Very High Gravity Conditions

Khongsay, Naulchan; Laopaiboon, Lakkana; Laopaiboon, Pattana

doi:10.3923/biotech.2010.9.16

Cited by 31 publications

(18 citation statements)

References 23 publications

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“…Increasing the ethanol concentration in the broth can significantly improve the energy efficiency by reducing the energy consumption in distillation and the amount of waste stillage produced. Very high gravity (VHG) ethanol fermentations use media containing more than 270 g L −1 of total sugars [7,8]. This technology is gradually being applied to the industry where the goals of 15-16% or more alcohol are being set in order to lower the costs [7,9].…”

Section: Introductionmentioning

confidence: 99%

Optimization of Agitation and Aeration for Very High Gravity Ethanol Fermentation from Sweet Sorghum Juice by Saccharomyces cerevisiae Using an Orthogonal Array Design

et al. 2012

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Optimization of three parameters: agitation rate (A; 100, 200 and 300 rpm), aeration rate (B; 0.5, 1.5 and 2.5 vvm) and aeration timing (C; 2, 4 and 6 h), for ethanol production from sweet sorghum juice under very high gravity (VHG, 290 g L−1 of total sugar) conditions by Saccharomyces cerevisiae NP 01 was attempted using an L9 (34) orthogonal array design. The fermentation was carried out at 30 °C in a 2-L bioreactor and the initial yeast cell concentration was approximately 2 × 107 cells mL−1. The results showed that the optimum condition for ethanol fermentation should be A2B3C2 corresponding to agitation rate, 200 rpm; aeration rate, 2.5 vvm and aeration timing, 4 h. The verification experiments under the optimum condition clearly indicated that the aeration and agitation strategies improved ethanol production. The ethanol concentration (P), productivity (Qp) and ethanol yield (Yp/s) were 132.82 ± 1.06 g L−1, 2.55 ± 0.00 g L−1h−1 and 0.50 ± 0.00, respectively. Under the same condition without aeration (agitation rate at 200 rpm), P and Qp were only 118.02 ± 1.19 g L−1 and 2.19 ± 0.04 g L−1h−1, respectively while Yp/s was not different from that under the optimum condition.

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Section: Introductionmentioning

confidence: 99%

Optimization of Agitation and Aeration for Very High Gravity Ethanol Fermentation from Sweet Sorghum Juice by Saccharomyces cerevisiae Using an Orthogonal Array Design

et al. 2012

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“…The extraction was 50% and total reducing sugars was 5.64% with ethanol yield of 38.89 1/ ton stalk. Khongsay et al (2010) investigated the effects of initial cell concentrations and nitrogen supplementation on growth and ethanol production from sweet sorghum juice using S. cerevisiae under normal gravity (fermentation of mashes containing 20-24% of dissolved solids) and very high gravity conditions [mashes containing C27% of dissolved solids (Bayrock and Ingledew 2001)]. Under conditions of 30°C, 100 rpm in a 2-l fermenter, the initial cell concentration of 1 9 10 8 cells ml -1 and absence of nitrogen supplementation gave maximum ethanol production efficiencies under both normal and very high gravity conditions.…”

Section: Fermentationmentioning

confidence: 97%

Sweet Sorghum as Feedstock for Biofuel Production: A Review

et al. 2011

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Fossil energy resources, the primary source of transport fuel in the world is depleting dramatically to meet the ever-increasing energy demands globally. Crop plants are one of the best sources of renewable energy which can be used as feedstock for biofuel production. Sweet sorghum [Sorghum bicolor (L.) Moench], a C 4 Graminaceous crop which has sugar-rich stalks and which is a water-use efficient crop has a very good potential as an alternative feed stock for ethanol production. It is the only crop that provides grain and stem that can be used for sugar, alcohol, syrup, jaggery, fodder, fuel, bedding, roofing, fencing, paper and chewing. Sweet sorghum juices usually contain approximately 16-18% fermentable sugar, which can be directly fermented into ethanol by yeast. Technical challenges of using sweet sorghum for biofuels are a short harvest period for highest sugar content and fast sugar degradation during storage. Various review works based on the problems of sweet sorghum were described in this review. Some studies are on the genetic potential of sweet sorghum for higher green cane yield and juice extractability where as some studies are purely on the shelf life of the juice how to preserve the juice with low cost against bacterial contamination. Studies also involve testing the potential of genotypes for superior yields of cane during post rainy and summer seasons also to make the cane available for maximum period in a year. Studies on fermentation and hydrolysis of lignocellulose are also addressed in this review.

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“…Kemampuan dari mikroorganisme produsen etanol dalam menghasilkan etanol tergantung pada banyak faktor kunci, di antaranya adalah jenis varietas, faktor pertumbuhan, dan kondisi fermentasi (Khongsay et al, 2010;Fakruddin et al, 2012). Toleransi pada stress merupakan sifat penting dari mikroorganisme dalam kaitannya dengan aplikasi di industri (Somda et al, 2011).…”

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Effect of Temperature Stress and Metal Ion Supplement on Ethanol Fermentation by Zymomonas mobilis

et al. 2016

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Growth and Batch Ethanol Fermentation of Saccharomyces cerevisiae on Sweet Sorghum Stem Juice under Normal and Very High Gravity Conditions

Cited by 31 publications

References 23 publications

Optimization of Agitation and Aeration for Very High Gravity Ethanol Fermentation from Sweet Sorghum Juice by Saccharomyces cerevisiae Using an Orthogonal Array Design

Optimization of Agitation and Aeration for Very High Gravity Ethanol Fermentation from Sweet Sorghum Juice by Saccharomyces cerevisiae Using an Orthogonal Array Design

Sweet Sorghum as Feedstock for Biofuel Production: A Review

Effect of Temperature Stress and Metal Ion Supplement on Ethanol Fermentation by Zymomonas mobilis

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