Immobilization of Saccharomyces cerevisiae on to acrylamide–sodium acrylate hydrogels for production of ethyl alcohol

Öztop, H. Nursevin; Öztop, A. Yasemin; Karadağ, Erdener; Işıkver, Yasemin; Saraydın, Dursun

doi:10.1016/s0141-0229(02)00244-2

Cited by 36 publications

(16 citation statements)

References 11 publications

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“…In general, the carrier for immobilization should be inexpensive, stable, reusable, non-toxic and should allow for high yeast cell concentrations with minimal internal mass transfer limitations (Verbelen et al 2006). Many carrier materials for cell immobilization have been reported, including Ca-alginate, κ-carrageenan, polyacrylamide and γ-alumina in ethanol fermentation (Oztop et al 2003). The most commonly used ethanol producer is Saccharomyces cerevisiae in all the above cases.…”

Section: Introductionmentioning

confidence: 99%

Repeated batch ethanolic fermentation of very high gravity medium by immobilized Saccharomyces cerevisiae

Puligundla

Poludasu

Kumar³

et al. 2011

Ann Microbiol

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The main objective of this study was to evaluate the effect of yeast immobilization on ethanolic fermentation of very high gravity (VHG) medium and to determine the concentrations of yeast storage carbohydrates like trehalose and glycogen during the process. Repeated batch ethanolic fermentation of VHG medium was carried out using Saccharomyces cerevisiae immobilized separately within Ca-alginate and κ-carrageenan polymers. Immobilization yields (Y I ) were between 80 and 90% and ethanol yields (Y P/S ) were more than 0.41 with both carriers. An average fermentation efficiency of nearly 70% was observed in 48-h fermentation batches. Compared to free cells, a reduction of more than 50% in the accumulated trehalose, and a twofold increase in intracellular glycogen levels were observed in immobilized yeast cells at 24 and 48 h of fermentation, respectively, with both carriers. The increased viability (up to four-fold higher) upon 18% ethanol treatment for 2 h, and the sustained viability over four successive batches of immobilized cells showed the protective nature of the polymer carriers. The chemical nature of the carriers was not found to have any adverse effect on ethanol yields. Application of immobilized yeast in porous matrices may serve as a feasible and better technique for ethanol production, at both pilot and industrial scale.

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Section: Introductionmentioning

confidence: 99%

Repeated batch ethanolic fermentation of very high gravity medium by immobilized Saccharomyces cerevisiae

Puligundla

Poludasu

Kumar³

et al. 2011

Ann Microbiol

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“…Their highly porous structure can easily be tuned by controlling the density of crosslinks in the gel matrix and the affinity of the hydrogels for the aqueous environment in which they are swollen [1]. Keeping in mind these characteristics, researchers turned to the synthesis of hydrogels, based on natural or synthetic precursors [2][3][4][5]. The good properties of the hydrogels provide them wide industrial applications, such as the controlled release of drugs, modern soft contact lenses or superabsorbents for personal hygiene products [6].…”

Section: Introductionmentioning

confidence: 99%

Entrapment of Saccharomyces cerevisiae cells in u.v. crosslinked hydroxyethylcellulose/poly(ethylene oxide) double-layered gels

Velickova

Petrov

Tsvetanov

et al. 2010

Reactive and Functional Polymers

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“…Among this approach, the most explored are immobilization of yeasts in/on adequate matrices such as calcium alginate, k-carragenan gel, polyacrylamide-alumina [40,48,79,80,88], wooden chips [89], PVA gel [90], orange peel [91], etc. Among this approach, the most explored are immobilization of yeasts in/on adequate matrices such as calcium alginate, k-carragenan gel, polyacrylamide-alumina [40,48,79,80,88], wooden chips [89], PVA gel [90], orange peel [91], etc.…”

Section: Fermentationmentioning

confidence: 99%

“…tually enable reuse [48,[79][80][81][82][83][84][85][86][87][88][89][90]. For this purpose Rakin et al applied immobilization in two biocompatible polymers such as: PVA and Ca−alginate [90] demonstrating that the PVA exhibited better mechanical properties and stability in repeated use, while Ca-alginate immobilized yeast gave higher ethanol yields, most probably due to lower mass transport restricttions.…”

Section: Bioethanol Economymentioning

confidence: 99%

Progress in the production of bioethanol on starch-based feedstocks

Mojović¹,

Pejin

Grujić

et al. 2009

CI&CEQ

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Bioethanol produced from renewable biomass, such as sugar, starch, or lignocellulosic materials, is one of the alternative energy resources, which is both renewable and environmentally friendly. Although, the priority in global future ethanol production is put on lignocellulosic processing, which is considered as one of the most promising second-generation biofuel technologies, the utilizetion of lignocellulosic material for fuel ethanol is still under improvement. Sugar-based (molasses, sugar cane, sugar beet) and starch-based (corn, wheat, triticale, potato, rice, etc.) feedstock are still currently predominant at the industrial level and they are, so far, economically favorable compared to lingocelluloses. Currently, approx. 80 % of total world ethanol production is obtained from the fermentation of simple sugars by yeast. In Serbia, one of the most suitable and available agricultural raw material for the industrial ethanol production are cereals such as corn, wheat and triticale. In addition, surpluses of this feedstock are being produced in our country constantly. In this paper, a brief review of the state of the art in bioethanol production and biomass availability is given, pointing out the progress possibilities on starch-based production. The progress possibilities are discussed in the domain of feedstock choice and pretreatment, optimization of fermentation, process integration and utilization of the process byproducts.

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Immobilization of Saccharomyces cerevisiae on to acrylamide–sodium acrylate hydrogels for production of ethyl alcohol

Cited by 36 publications

References 11 publications

Repeated batch ethanolic fermentation of very high gravity medium by immobilized Saccharomyces cerevisiae

Repeated batch ethanolic fermentation of very high gravity medium by immobilized Saccharomyces cerevisiae

Entrapment of Saccharomyces cerevisiae cells in u.v. crosslinked hydroxyethylcellulose/poly(ethylene oxide) double-layered gels

Progress in the production of bioethanol on starch-based feedstocks

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