Increased ethanol production from sweet sorghum juice concentrated by a membrane separation process

Sasaki, Kengo; Tsuge, Yota; Sasaki, Daisuke; Teramura, Hiroshi; Wakai, Satoshi; Kawaguchi, Hideo; Sazuka, Takashi; Ogino, Chiaki; Kondo, Akihiko

doi:10.1016/j.biortech.2014.07.082

Cited by 21 publications

(17 citation statements)

References 20 publications

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“…Although the carbohydrate content of feed varies according to the annual variation of juice composition, the flux could be stabilized between 35-45 L/(m 2 h) at 20 °C and 10 bar transmembrane pressure. Sasaki and coworkers [84] performed purification of raw juice of cultivar SIL05 by ultrafiltration at 4 bar however, flux values and composition of permeates were not published, since they focused on the forthcoming ethanol production by fermentation.…”

Section: Ultrafiltration (Uf)mentioning

confidence: 99%

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

Cséfalvay

Bakacsi

2018

Period. Polytech. Chem. Eng.

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The development of sweet sorghum syrup producing technology for the juice of cultivar Sucrosorgho 506 was completed. The applicability of different existing syrup production technologies including sugar beet-based sugar production technology, and sugar cane processing technology was also tested. The new chemical-free syrup production technology was realized at laboratory-scale and large laboratory-scale. The proposed technology offers a chemical free separation and concentration of carbohydrates, and consists of centrifugal separation; ultrafiltration extended with an approved sterilization followed by nanofiltration to separate carbohydrates and inorganics, and finally a vacuum evaporation to reach syrup state. By using this technology the initial glucose:fructose:sucrose ratio could be preserved in the syrup, therefore not limiting its further use. The possible food application was established by sensory analysis. It was revealed that the syrup produced via the developed process obtained the most attractive character that enables the opportunity to use as natural sweetener.

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Section: Ultrafiltration (Uf)mentioning

confidence: 99%

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

Cséfalvay

Bakacsi

2018

Period. Polytech. Chem. Eng.

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“…Subsequently, a nanofiltration (NF) membrane, with molecular-weight cut-off of 150 g mol À1 , permits concentration of the sugars contained in the UF membrane permeate. Sweet sorghum juice subjected to the combination of UF permeation and NF concentration yielded production of ethanol at high levels (131.4-133.5 g L À1 ) upon fermentation with S. cerevisiae (Sasaki et al, 2014). The UF/NF membrane separation system also increases the starting concentration of amino acids (nitrogen source) in the substrate (Sasaki et al, 2014).…”

Section: Introductionmentioning

confidence: 97%

“…Sorghum has several additional advantages, including a short growing period of 4-5 months, as well as reduced requirements for fertilizer and water compared to other sugar crops (Sipos et al, 2009). Recently, sweet sorghum juice has been employed for ethanol fermentation using Saccharomyces cerevisiae (Sasaki et al, 2014;Ratnavathi et al, 2011;Laopaiboon et al, 2009). To increase ethanol production and decrease the energy requirement for distillation, starting sugar concentrations have been increased by adding exogenous sugar (Laopaiboon et al, 2009 Another strategy for increasing starting sugar concentrations is membrane separation.…”

Section: Introductionmentioning

confidence: 99%

“…Sweet sorghum juice subjected to the combination of UF permeation and NF concentration yielded production of ethanol at high levels (131.4-133.5 g L À1 ) upon fermentation with S. cerevisiae (Sasaki et al, 2014). The UF/NF membrane separation system also increases the starting concentration of amino acids (nitrogen source) in the substrate (Sasaki et al, 2014). In sequential fed-batch fermentation from the sweet sorghum juice, exogenous nutrient, i.e., nitrogen source is also contained together with sugar (Laopaiboon et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

“…Membrane separation can fractionate complex mixtures and is a cost-effective technology (He et al, 2012). Membrane separation for sweet sorghum juice involved passage through multiple membranes (Sasaki et al, 2014). The first, the ultrafiltration (UF) membrane, has a molecular-weight cut-off of 150,000 g mol À1 , permitting the passage of sugars in the sweet sorghum juice while retaining polymeric compounds and large residues.…”

Section: Introductionmentioning

confidence: 99%

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Repeated ethanol production from sweet sorghum juice concentrated by membrane separation

Sasaki

Tsuge

Sasaki

et al. 2015

Bioresource Technology

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Sucrose purification and repeated ethanol production from sugars remaining in sweet sorghum juice subjected to a membrane separation process

Sasaki

Tsuge

Kawaguchi

et al. 2017

Appl Microbiol Biotechnol

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The juice from sweet sorghum cultivar SIL-05 (harvested at physiological maturity) was extracted, and the component sucrose and reducing sugars (such as glucose and fructose) were subjected to a membrane separation process to purify the sucrose for subsequent sugar refining and to obtain a feedstock for repeated bioethanol production. Nanofiltration (NF) of an ultrafiltration (UF) permeate using an NTR-7450 membrane (Nitto Denko Corporation, Osaka, Japan) concentrated the juice and produced a sucrose-rich fraction (143.2 g L sucrose, 8.5 g L glucose, and 4.5 g L fructose). In addition, the above NF permeate was concentrated using an ESNA3 NF membrane to provide concentrated permeated sugars (227.9 g L) and capture various amino acids in the juice, enabling subsequent ethanol fermentation without the addition of an exogenous nitrogen source. Sequential batch fermentation using the ESNA3 membrane concentrate provided an ethanol titer and theoretical ethanol yield of 102.5-109.5 g L and 84.4-89.6%, respectively, throughout the five-cycle batch fermentation by Saccharomyces cerevisiae BY4741. Our results demonstrate that a membrane process using UF and two types of NF membranes has the potential to allow sucrose purification and repeated bioethanol production.

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Increased ethanol production from sweet sorghum juice concentrated by a membrane separation process

Cited by 21 publications

References 20 publications

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

Chemical-free Processing of Sweet Sorghum Juice of Cultivar Sucrosorgho 506

Repeated ethanol production from sweet sorghum juice concentrated by membrane separation

Sucrose purification and repeated ethanol production from sugars remaining in sweet sorghum juice subjected to a membrane separation process

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