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Xylans are a valuable alternative resource: production of D-xylose, D-lyxose and furfural under microwave irradiation. Carbohydr Polym 2013; 98:1416-21. [PMID: 24053822 DOI: 10.1016/j.carbpol.2013.07.066] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2013] [Revised: 07/18/2013] [Accepted: 07/26/2013] [Indexed: 11/22/2022]
Abstract
The influence of microwave irradiation on hydrolysis of xylan and simultaneous epimerization of the D-xylose to D-lyxose has been studied. An acidic solution of xylan was treated with catalytic amount of sodium molybdate and the composition of the reaction mixture was analyzed. Short reaction times of hydrolysis and subsequent epimerization reaction provided an equilibrium reaction mixture of D-xylose and D-lyxose (1.6:1) without significant formation of undesirable side products. Obtained pentoses can be reduced to the corresponding alditols (D-xylitol and D-lyxitol) in very good yields (88% and 85%) or can be further dehydrated to furfural (53%). Combined use of Mo(VI) catalyst and microwave irradiation allows better conversions and substantial reduction of reaction times (400-fold) compared to that obtained by conventional heating. Studied stereospecific transformation of xylan proceeds with high selectivity, short reaction times and very good yields that makes this approach attractive also for preparative purposes.
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Abstract
Xylitol, a naturally occurring five-carbon sugar alcohol, can be produced from D-xylose through microbial hydrogenation. Xylitol has found increasing use in the food industries, especially in confectionary. It is the only so-called "second-generation polyol sweeteners" that is allowed to have the specific health claims in some world markets. In this study, the effect of cell density on the xylitol production by the yeast Debaryomyces hansenii NRRL Upsilon-7426 from D-xylose under microaerobic conditions was examined. The rate of xylitol production increased with increasing yeast cell density to 3 g/L. Beyond this amount there was no increase in the xylitol production with increasing cell density. The optimal pH range for xylitol production was between 4.5 and 5.5. The optimal temperature was between 28 and 37 degrees C, and the optimal shaking speed was 300 rpm. The rate of xylitol production increased linearly with increasing initial xylose concentration. A high concentration of xylose (279 g/L) was converted rapidly and efficiently to produce xylitol with a product concentration of 221 g/L was reached after 48 h of incubation under optimum conditions.
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Sampaio FC, Torre P, Passos FML, de Moraes CA, Perego P, Converti A. Influence of inhibitory compounds and minor sugars on xylitol production by Debaryomyces hansenii. Appl Biochem Biotechnol 2007; 136:165-82. [PMID: 17496338 DOI: 10.1007/bf02686021] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2006] [Revised: 04/09/2006] [Accepted: 04/20/2006] [Indexed: 10/22/2022]
Abstract
To obtain in-depth information on the overall metabolic behavior of the new good xylitol producer Debaryomyces hansenii UFV-170, batch bioconversions were carried out using semisynthetic media with compositions simulating those of typical acidic hemicellulose hydrolysates of sugarcane bagasse. For this purpose, we used media containing glucose (4.3-6.5 g/L), xylose (60.1-92.1 g/L), or arabinose (5.9-9.2 g/L), or binary or ternary mixtures of them in either the presence or absence of typical inhibitors of acidic hydrolysates, such as furfural (1.0-5.0 g/L), hydroxymethylfurfural (0.01- 0.30 g/L), acetic acid (0.5-3.0 g/L), and vanillin (0.5-3.0 g/L). D. hansenii exhibited a good tolerance to high sugar concentrations as well as to the presence of inhibiting compounds in the fermentation media. It was able to produce xylitol only from xylose, arabitol from arabinose, and no glucitol from glucose. Arabinose metabolization was incomplete, while ethanol was mainly produced from glucose and, to a lesser less extent, from xylose and arabinose. The results suggest potential application of this strain in xyloseto- xylitol bioconversion from complex xylose media from lignocellulosic materials.
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Affiliation(s)
- Fábio C Sampaio
- Department of Microbiology, Instituto de Biotecnologia Aplicada à Agropecuária, Federal University of Viçosa, Av. P. H. Rolfs s/n, 36570-000 Viçosa, Minas Gerais, Brazil
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Villarreal M, Prata A, Felipe M, Almeida E Silva J. Detoxification procedures of eucalyptus hemicellulose hydrolysate for xylitol production by Candida guilliermondii. Enzyme Microb Technol 2006. [DOI: 10.1016/j.enzmictec.2005.10.032] [Citation(s) in RCA: 89] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Carvalheiro F, Duarte LC, Lopes S, Parajó JC, Pereira H, Gírio FM. Supplementation requirements of brewery's spent grain hydrolysate for biomass and xylitol production by Debaryomyces hansenii CCMI 941. J Ind Microbiol Biotechnol 2006; 33:646-54. [PMID: 16520980 DOI: 10.1007/s10295-006-0101-8] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2005] [Accepted: 02/03/2006] [Indexed: 11/26/2022]
Abstract
The effect of nutrient supplementation of brewery's spent grain (BSG) hydrolysates was evaluated with respect to biomass and xylitol production by Debaryomyces hansenii. For optimal biomass production, supplementation of full-strength BSG hydrolysates required only phosphate (0.5 g l(-1) KH(2)PO(4)), leading to a biomass yield and productivity of 0.60 g g(-1) monosaccharides and 0.55 g l(-1 )h(-1), respectively. Under the conditions studied, no metabolic products other than CO(2) and biomass were identified. For xylitol production, fourfold and sixfold concentrated hydrolysate-based media were used to assess the supplementation effects. The type of nutrient supplementation modulated the ratio of total polyols/total extracellular metabolites as well as the xylitol/arabitol ratio. While the former varied from 0.8 to 1, the xylitol/arabitol ratio reached a maximum value of 2.6 for yeast extract (YE)-supplemented hydrolysates. The increase in xylitol productivity and yield was related to the increase of the percentage of consumed xylose induced by supplementation. The best xylitol yield and productivity were found for YE supplementation corresponding to 0.55 g g(-1) and 0.36 g l(-1 )h(-1), respectively. In sixfold concentrated hydrolysates, providing that the hydrolysate was supplemented, the levels of xylitol produced were similar or higher than those for arabitol. Xylitol yield exhibited a further increase in the sixfold hydrolysate supplemented with trace elements, vitamins and minerals to 0.65 g g(-1), albeit the xylitol productivity was somewhat lower. The effect of using activated charcoal detoxification in non-supplemented versus supplemented sixfold hydrolysates was also studied. Detoxification did not improve polyols formation, suggesting that the hemicellulose-derived inhibitor levels present in concentrated BSG hydrolysates are well tolerated by D. hansenii.
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Affiliation(s)
- F Carvalheiro
- Departamento de Biotecnologia, INETI, Estrada do Paço do Lumiar 22, 1649-038, Lisboa, Portugal
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Breuer U, Harms H. Debaryomyces hansenii — an extremophilic yeast with biotechnological potential. Yeast 2006; 23:415-37. [PMID: 16652409 DOI: 10.1002/yea.1374] [Citation(s) in RCA: 189] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We illuminate the ecological, physiological and genetic characteristics of the yeast Debaryomyces hansenii in the view of our belief that this metabolically versatile, non-pathogenic, osmotolerant and oleaginous microorganism represents an attractive target for fundamental and applied biotechnological research. To this end, we give a broad overview of extant biotechnological procedures using D. hansenii, e.g. in the manufacture of various foods, and propose research into the heterologous synthesis of a range of fine chemicals.
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Affiliation(s)
- Uta Breuer
- UFZ-Centre of Environmental Research Leipzig-Halle, Department of Environmental Microbiology, Permoserstrasse 15, D-04318 Leipzig, Germany.
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Carvalheiro F, Duarte L, Lopes S, Parajó J, Pereira H, Gı́rio F. Evaluation of the detoxification of brewery’s spent grain hydrolysate for xylitol production by Debaryomyces hansenii CCMI 941. Process Biochem 2005. [DOI: 10.1016/j.procbio.2004.04.015] [Citation(s) in RCA: 113] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Carvalho W, Silva SS, Converti A, Vitolo M. Metabolic behavior of immobilized Candida guilliermondii cells during batch xylitol production from sugarcane bagasse acid hydrolyzate. Biotechnol Bioeng 2002; 79:165-9. [PMID: 12115432 DOI: 10.1002/bit.10319] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Candida guilliermondii cells, immobilized in Ca-alginate beads, were used for batch xylitol production from concentrated sugarcane bagasse hydrolyzate. Maximum xylitol concentration (20.6 g/L), volumetric productivity (0.43 g/L. h), and yield (0.47 g/g) obtained after 48 h of fermentation were higher than similar immobilized-cell systems but lower than free-cell cultivation systems. Substrates, products, and biomass concentrations were used in material balances to study the ways in which the different carbon sources were utilized by the yeast cells under microaerobic conditions. The fraction of xylose consumed to produce xylitol reached a maximum value (0.70) after glucose and oxygen depletion while alternative metabolic routes were favored by sub-optimal conditions.
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Affiliation(s)
- Walter Carvalho
- Department of Biotechnology, Faculty of Chemical Engineering of Lorena, Rodovia Itajubá-Lorena, km 74.5, Lorena, S.P., Brazil, 12600-000
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Latif F, Rajoka MI. Production of ethanol and xylitol from corn cobs by yeasts. BIORESOURCE TECHNOLOGY 2001; 77:57-63. [PMID: 11211076 DOI: 10.1016/s0960-8524(00)00134-6] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Saccharomyces cerevisiae and Candida tropicalis were used separately and as co-culture for simultaneous saccharification and fermentation (SSF) of 5-20% (w/v) dry corn cobs. A maximal ethanol concentration of 27, 23, 21 g/l (w/v) from 200 g/l (w/v) dry corn cobs was obtained by S. cerevisiae, C. tropicalis and the co-culture, respectively, after 96 h of fermentation. However, theoretical yields of 82%, 71% and 63% were observed from 50 g/l dry corn cobs for the above cultures, respectively. Maximal xylitol concentration of 21, 20 and 15 g/l from 200 g/l (w/v) dry corn cobs was obtained by C. tropicalis, co-culture, and S. cerevisiae, respectively. Maximum theoretical yields of 79.0%, 77.0% and 58% were observed from 50 g/l of corn cobs, respectively. The volumetric productivities for ethanol and xylitol increased with the increase in substrate concentration, whereas, yield decreased. Glycerol and acetic acid were formed as minor by-products. S. cerevisiae and C. tropicalis resulted in better product yields (0.42 and 0.36 g/g) for ethanol and (0.52 and 0.71 g/g) for xylitol, respectively, whereas, the co-culture showed moderate level of ethanol (0.32 g/g) and almost maximal levels of xylitol (0.69 g/g).
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Affiliation(s)
- F Latif
- National Institute for Biotechnology and Genetic Engineering, Faisalabad, Pakistan
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Walther T, Hensirisak P, Agblevor FA. The influence of aeration and hemicellulosic sugars on xylitol production by Candida tropicalis. BIORESOURCE TECHNOLOGY 2001; 76:213-220. [PMID: 11198172 DOI: 10.1016/s0960-8524(00)00113-9] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The influence of other hemicellulosic sugars (arabinose, galactose, mannose and glucose), oxygen limitation, and initial xylose concentration on the fermentation of xylose to xylitol was investigated using experimental design methodology. Oxygen limitation and initial xylose concentration had considerable influences on xylitol production by Canadida tropicalis ATCC 96745. Under semiaerobic conditions, the maximum xylitol yield was 0.62 g/g substrate, while under aerobic conditions, the maximum volumetric productivity was 0.90 g/l h. In the presence of glucose, xylose utilization was strongly repressed and sequential sugar utilization was observed. Ethanol produced from the glucose caused 50% reduction in xylitol yield when its concentration exceeded 30 g/l. When complex synthetic hemicellulosic sugars were fermented, glucose was initially consumed followed by a simultaneous uptake of the other sugars. The maximum xylitol yield (0.84 g/g) and volumetric productivity (0.49 g/l h) were obtained for substrates containing high arabinose and low glucose and mannose contents.
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Affiliation(s)
- T Walther
- Department of Mechanical Engineering, Technical University of Dresden, Dresden, Germany
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Converti A, Domínguez JM, Perego P, da Silva SS, Zilli M. Wood Hydrolysis and Hydrolyzate Detoxification for Subsequent Xylitol Production. Chem Eng Technol 2000. [DOI: 10.1002/1521-4125(200011)23:11<1013::aid-ceat1013>3.0.co;2-c] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
An eicosapentaenoic acid (EPA)- and docosahexaenoic acid (DHA)-incorporating yeast, FO726A, was putatively identified as Candida guilliermondii on the basis of morphological, physiological and biochemical characteristics. Culture conditions for FO726A were investigated with respect to cell mass productivity, cellular accumulation of total lipid, triglyceride (TG), EPA and DHA. When grown at 20 degrees C for 24 h in an optimal medium containing 1 g scrap fish oil, the yeast yielded 820 mg dry cells which consisted of 40.7% lipid, 40.2% protein and 14.1% carbohydrate. The lipid (334mg) consisted of 300 mg TG (36.6% of dry cells), 23.2 mg EPA (2.8%) and 54.8 mg DHA (6.7%), and the recovery rates of EPA and DHA from the fish oil were 27.1 and 43.6%, respectively. The positional distributions of fatty acids in the TG from the yeast were then investigated and compared with those in the TG from the fish oil. The EPA and DHA in the fish oil were concentrated more in the sn-1,3 positions (8.8 and 13.7%, respectively) than in the sn-2 position (3.7 and 10.8%, respectively). In the case of the TG from the yeast, EPA was present to a greater extent in the sn-1,3 positions than in the sn-2 position. In contrast, DHA was preferentially present in the sn-2 position, approximately twice that in the sn-1,3 positions.
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Affiliation(s)
- X Guo
- Department of Applied Biochemistry, Faculty of Applied Biological Science, Hiroshima University, Japan.
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Tavares JM, Duarte LC, Amaral-Collaço MT, Gírio FM. The influence of hexoses addition on the fermentation of d-xylose in Debaryomyces hansenii under continuous cultivation. Enzyme Microb Technol 2000; 26:743-747. [PMID: 10862880 DOI: 10.1016/s0141-0229(00)00166-6] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The effect of hexoses (glucose and galactose) addition to the feed xylose mineral medium of Debaryomyces hansenii chemostat cultures grown at a constant dilution rate of 0.055 h(-1) was studied. Xylitol was the major product detected amongst all tested conditions. The maximal values for xylitol yield and volumetric productivity (0.56 gg(-1) xylose and 0.21 gl(-1)h(-1), respectively) were obtained for a glucose/xylose feeding ratio of 10%, showing that the addition of small amounts of glucose, but not galactose, enhanced the xylitol production. A xylitol yield increase of 30%, compared with the sole xylose-containing feed medium, was observed. It was found that the oxygen requirement for D. hansenii growth is lower under glucose compared with xylose. Ethanol and glycerol were only produced for glucose/xylose feeding ratio above 30%. The byproducts accumulation was correlated with glucose metabolism, because a direct relationship between the increase of ethanol (and glycerol) concentration and the increase of glucose in the feed medium was found.
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Affiliation(s)
- JM Tavares
- Unidade de Microbiologia Industrial e Bioprocessos, Departamento de Biotecnologia, IBQTA, INETI, Azinhaga dos Lameiros 1649-038, Lisboa, Portugal
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Cruz JM, Domı́nguez JM, Domı́nguez H, Parajó JC. Solvent extraction of hemicellulosic wood hydrolysates: a procedure useful for obtaining both detoxified fermentation media and polyphenols with antioxidant activity. Food Chem 1999. [DOI: 10.1016/s0308-8146(99)00106-5] [Citation(s) in RCA: 74] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Converti A, Del Borghi M. Inhibition of the fermentation of oak hemicellulose acid-hydrolysate by minor sugars. J Biotechnol 1998. [DOI: 10.1016/s0168-1656(98)00109-6] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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GURGEL P, FURLAN S, MARTINEZ S, MANCILHA I. EVALUATION OF SUGARCANE BAGASSE ACID HYDROLYZATE TREATMENTS FOR XYLITOL PRODUCTION. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 1998. [DOI: 10.1590/s0104-66321998000300009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Pretreatment of sugarcane bagasse hemicellulose hydrolysate for xylitol production byCandida guilliermondii. Appl Biochem Biotechnol 1998. [DOI: 10.1007/bf02920126] [Citation(s) in RCA: 104] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Parajó J, Domínguez H, Domínguez J. Xylitol production from Eucalyptus wood hydrolysates extracted with organic solvents. Process Biochem 1997. [DOI: 10.1016/s0032-9592(97)00016-2] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Parajó J, Dominguez H, Domínguez J. Improved xylitol production with Debaryomyces hansenii Y-7426 from raw or detoxified wood hydrolysates. Enzyme Microb Technol 1997. [DOI: 10.1016/s0141-0229(96)00210-4] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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21
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Meinander NQ, Hahn-Hägerdal B. Fed-batch xylitol production with two recombinant Saccharomyces cerevisiae strains expressing XYL1 at different levels, using glucose as a cosubstrate: A comparison of production parameters and strain stability. Biotechnol Bioeng 1997; 54:391-9. [DOI: 10.1002/(sici)1097-0290(19970520)54:4<391::aid-bit12>3.0.co;2-j] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Production of 2,3- butanediol from pretreated corn cob byKlebsiella oxytoca in the presence of fungal cellulase. Appl Biochem Biotechnol 1997; 63-65:129-39. [DOI: 10.1007/bf02920419] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Roca E, Meinander N, Hahn–Hägerdal B. Xylitol production by immobilized recombinantSaccharomyces cerevisiae in a continuous packed-bed bioreactor. Biotechnol Bioeng 1996; 51:317-26. [DOI: 10.1002/(sici)1097-0290(19960805)51:3<317::aid-bit7>3.0.co;2-g] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Converti A, Del Borghi M. Selection of hemicellulosic hydrolysate pretreatments and fermentation conditions to stimulate xylitol production by ethanol-producing yeasts. ACTA ACUST UNITED AC 1996. [DOI: 10.1002/abio.370160207] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Felipe MG, Vieira DC, Vitolo M, Silva SS, Roberto IC, Manchilha IM. Effect of acetic acid on xylose fermentation to xylitol by Candida guilliermondii. J Basic Microbiol 1995; 35:171-7. [PMID: 7608864 DOI: 10.1002/jobm.3620350309] [Citation(s) in RCA: 93] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The effect of acetic acid concentration on xylose-fermentation to xylitol by Candida guilliermondii FTI 20037 was evaluated in semisynthetic medium containing different concentrations of the acid. Increasing acetic acid concentration up to 1.0 g/l favored xylitol yield and productivity, with maximum values of 0.82 g/g and 0.57 g/l.h, respectively. The presence of acetic acid reduced cell production at all concentration. Furthermore, acetic acid was assimilated by the yeast together with the sugars and was depleted from the medium at concentrations of less than 3.0 g/l. The ability of this yeast to assimilate acetic acid suggests that these cells act as agents of medium detoxification. This behavior may lead to a viable microbiological process of xylitol production by C. guilliermondii FTI 20037 using xylose-rich lignocellulosic hydrolysates in which acetic acid is commonly present, causing inhibition of fermentative activity.
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Affiliation(s)
- M G Felipe
- Department of Biotechnology, Faculty of Chemical Engineering, Lorena, Brazil
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du Preez J. Process parameters and environmental factors affecting d-xylose fermentation by yeasts. Enzyme Microb Technol 1994. [DOI: 10.1016/0141-0229(94)90003-5] [Citation(s) in RCA: 127] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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30
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Cao NJ, Tang R, Gong CS, Chen LF. The effect of cell density on the production of xylitol from D-xylose by yeast. Appl Biochem Biotechnol 1994; 45-46:515-9. [PMID: 8010768 DOI: 10.1007/bf02941826] [Citation(s) in RCA: 26] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The rate of xylitol production from D-xylose increased with increasing yeast cell density. The optimal temperature for xylitol production is 36 degrees C, and the optimal pH range is from 4.0 to 6.0. At high initial yeast cell concentration of 26 mg/mL, 210 g/L of xylitol was produced from 260 g/L of D-xylose after 96 h of incubation with an indicated yield of 81% of the theoretical value.
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Affiliation(s)
- N J Cao
- Department of Food Science, Purdue University, West Lafayette, IN 47907-1600
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Pretreatment of sugar cane bagasse hemicellulose hydrolyzate for ethanol production by yeast. Appl Biochem Biotechnol 1993. [DOI: 10.1007/bf02918979] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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32
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Meyrial V, Delgenes JP, Moletta R, Navarro JM. Xylitol production from D-xylose byCandida guillermondii: Fermentation behaviour. Biotechnol Lett 1991. [DOI: 10.1007/bf01041485] [Citation(s) in RCA: 97] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Barbosa MFS, Medeiros MB, Mancilha IM, Schneider H, Lee H. Screening of yeasts for production of xylitol fromd-xylose and some factors which affect xylitol yield inCandida guilliermondii. ACTA ACUST UNITED AC 1988. [DOI: 10.1007/bf01569582] [Citation(s) in RCA: 207] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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