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Garmaroody ER, PahnehKolaei ND, Ramezani O, Hamedi S. Detoxification Approaches of Bagasse Pith Hydrolysate Affecting Xylitol Production by Rhodotorula mucilaginosa. Appl Biochem Biotechnol 2024; 196:129-144. [PMID: 37103733 DOI: 10.1007/s12010-023-04539-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/11/2023] [Indexed: 04/28/2023]
Abstract
In this study, the potential of bagasse pith (the waste of sugar and paper industry) was investigated for bio-xylitol production for the first time. Xylose-rich hydrolysate was prepared using 8% dilute sulfuric acid, at 120 °C for 90 min. Then, the acid-hydrolyzed solution was detoxified by individual overliming (OL), active carbon (AC), and their combination (OL+AC). The amounts of reducing sugars and inhibitors (furfural and hydroxyl methyl furfural) were measured after acid pre-treatment and detoxification process. Thereafter, xylitol was produced from detoxified hydrolysate by Rhodotorula mucilaginosa yeast. Results showed that after acid hydrolysis, the sugar yield was 20%. Detoxification by overliming and active carbon methods increased the reducing sugar content up to 65% and 36% and decreased the concentration of inhibitors to >90% and 16%, respectively. Also, combined detoxification caused an increase in the reducing sugar content (>73%) and a complete removal of inhibitors. The highest productivity of xylitol (0.366 g/g) by yeast was attained after the addition of 100 g/l non-detoxified xylose-rich hydrolysate into fermentation broth after 96 h, while the xylitol productivity enhanced to 0.496 g/g after adding the similar amount of xylose-rich hydrolysate detoxified by combined method (OL+AC2.5%).
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Affiliation(s)
- Esmaeil Rasooly Garmaroody
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
| | - Niloufar Davoodi PahnehKolaei
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
| | - Omid Ramezani
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran.
| | - Sepideh Hamedi
- Dept. of Bio-refinery, Faculty of New Technologies, Zirab Campus, Shahid Beheshti University, Savadkooh, Mazandaran, Iran
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Zhang S, Fang W, Zhao B, Zhang W, Men Z. Investigating the H-Bond network of Ternary (Xylitol-Water-Acetic acid) Aqueous Solutions by Raman Spectroscopy and DFT. J Mol Liq 2022. [DOI: 10.1016/j.molliq.2022.121159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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Lee SH, Choe SY, Seo GG, Hong JH. Can "Functional Sweetener" Context Increase Liking for Cookies Formulated with Alternative Sweeteners? Foods 2021; 10:foods10020361. [PMID: 33562409 PMCID: PMC7915414 DOI: 10.3390/foods10020361] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Revised: 01/27/2021] [Accepted: 02/01/2021] [Indexed: 12/14/2022] Open
Abstract
Various strategies for replacing sugar with naturally derived sweeteners are being developed and tested. In this study, the effect of the “functional sweetener” context, which is created by providing health-promoting information, on liking for the sweeteners was investigated using a cookie model system. Cookie samples were prepared by replacing the sugar of 100% sucrose cookies (control) with phyllodulcin, rebaudioside A, xylobiose and sucralose either entirely or partly. The sensory profile of the samples was obtained using descriptive evaluations. Hedonic responses to cookie samples were collected from 96 consumers under blind and informed conditions. Replacement of 100% sucrose with rebaudioside A or phyllodulcin significantly increased bitterness but replacement of 50% sugar elicited sensory characteristics similar to those of the control. Although the “functional sweetener” context did not influence overall liking, liking for the samples was more clearly distinguished when information was provided. Consumers were segmented into three clusters according to their shift in liking in the informed condition: when information was presented, some consumers decreased their liking for sucralose cookies, while other consumers increased or decreased their liking for sucrose cookies. Results suggest that the influence of information varies among individual consumers and that cognitive stimulation, such as health-promoting information, affects liking.
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Affiliation(s)
- Soo-Hyun Lee
- Research Institute of Human Ecology, Seoul University, Seoul 03080, Korea;
| | - Seo-Youn Choe
- Department of Food and Nutrition, College of Science and Technology, Kookmin University, Seoul 02707, Korea;
| | - Ga-Gyeong Seo
- Department of Food and Nutrition, College of Human Ecology, Seoul University, Seoul 03080, Korea;
| | - Jae-Hee Hong
- Research Institute of Human Ecology, Seoul University, Seoul 03080, Korea;
- Department of Food and Nutrition, College of Human Ecology, Seoul University, Seoul 03080, Korea;
- Correspondence: ; Tel.: +82-2-880-6837
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Liu X, Lin Q, Yan Y, Peng F, Sun R, Ren J. Hemicellulose from Plant Biomass in Medical and Pharmaceutical Application: A Critical Review. Curr Med Chem 2019; 26:2430-2455. [PMID: 28685685 DOI: 10.2174/0929867324666170705113657] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/13/2017] [Accepted: 03/24/2017] [Indexed: 01/08/2023]
Abstract
BACKGROUND Due to the non-toxicity, abundance and biodegradability, recently more and more attention has been focused on the exploration of hemicellulose as the potential substrate for the production of liquid fuels and other value-added chemicals and materials in different fields. This review aims to summarize the current knowledge on the promising application of nature hemicellulose and its derivative products including its degradation products, its new derivatives and hemicellulosebased medical biodegradable materials in the medical and pharmaceutical field, especially for inmmune regulation, bacteria inhibition, drug release, anti-caries, scaffold materials and anti-tumor. METHODS We searched the related papers about the medical and pharmaceutical application of hemicellulose and its derivative products, and summarized their preparation methods, properties and use effects. RESULTS Two hundred and twenty-seven papers were included in this review. Forty-seven papers introduced the extraction and application in immune regulation of nature hemicellulose, such as xylan, mannan, xyloglucan (XG) and β-glucan. Seventy-seven papers mentioned the preparation and application of degradation products of hemicellulose for adjusting intestinal function, maintaining blood glucose levels, enhancing the immunity and alleviating human fatigue fields such as xylooligosaccharides, xylitol, xylose, arabinose, etc. The preparation of hemicellulose derivatives were described in thirty-two papers such as hemicellulose esters, hemicellulose ethers and their effects on anticoagulants, adsorption of creatinine, the addition of immune cells and the inhibition of harmful bacteria. Finally, the preparations of hemicellulose-based materials such as hydrogels and membrane for the field of drug release, cell immobilization, cancer therapy and wound dressings were presented using fifty-five papers. CONCLUSION The structure of hemicellulose-based products has the significant impact on properties and the use effect for the immunity, and treating various diseases of human. However, some efforts should be made to explore and improve the properties of hemicellulose-based products and design the new materials to broaden hemicellulose applications.
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Affiliation(s)
- Xinxin Liu
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Qixuan Lin
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Yuhuan Yan
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
| | - Feng Peng
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Runcang Sun
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, China
| | - Junli Ren
- State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China
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Park JB, Kim JS, Kweon DH, Kweon DH, Seo JH, Ha SJ. Overexpression of Endogenous Xylose Reductase Enhanced Xylitol Productivity at 40 °C by Thermotolerant Yeast Kluyveromyces marxianus. Appl Biochem Biotechnol 2019; 189:459-470. [DOI: 10.1007/s12010-019-03019-9] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2018] [Accepted: 04/22/2019] [Indexed: 10/26/2022]
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Siemen A, Kosciow K, Schweiger P, Deppenmeier U. Production of 5-ketofructose from fructose or sucrose using genetically modified Gluconobacter oxydans strains. Appl Microbiol Biotechnol 2017; 102:1699-1710. [PMID: 29279957 DOI: 10.1007/s00253-017-8699-1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2017] [Revised: 12/05/2017] [Accepted: 12/06/2017] [Indexed: 01/14/2023]
Abstract
The growing consumer demand for low-calorie, sugar-free foodstuff motivated us to search for alternative non-nutritive sweeteners. A promising sweet-tasting compound is 5-keto-D-fructose (5-KF), which is formed by membrane-bound fructose dehydrogenases (Fdh) in some Gluconobacter strains. The plasmid-based expression of the fdh genes in Gluconobacter (G.) oxydans resulted in a much higher Fdh activity in comparison to the native host G. japonicus. Growth experiments with G. oxydans fdh in fructose-containing media indicated that 5-KF was rapidly formed with a conversion efficiency of 90%. 5-KF production from fructose was also observed using resting cells with a yield of about 100%. In addition, a new approach was tested for the production of the sweetener 5-KF by using sucrose as a substrate. To this end, a two-strain system composed of the fdh-expressing strain and a G. oxydans strain that produced the sucrose hydrolyzing SacC was developed. The strains were co-cultured in sucrose medium and converted 92.5% of the available fructose units into 5-KF. The glucose moiety of sucrose was converted to 2-ketogluconate and acetate. With regard to the development of a sustainable and resource-saving process for the production of 5-KF, sugar beet extract was used as substrate for the two-strain system. Fructose as product from sucrose cleavage was mainly oxidized to 5-KF which was detected in a concentration of over 200 mM at the end of the fermentation process. In summary, the two-strain system was able to convert fructose units of sugar beet extract to 5-KF with an efficiency of 82 ± 5%.
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Affiliation(s)
| | | | - Paul Schweiger
- Department of Microbiology, University of Wisconsin-La Crosse, 1725 State Street, La Crosse, WI, 54601, USA
| | - Uwe Deppenmeier
- Institute of Microbiology and Biotechnology, University of Bonn, Meckenheimer Allee 168, 53115, Bonn, Germany.
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Santomaso AC, Baggio R, Zorzi F, Salviulo G, Realdon N, Franceschinis E. Sugars with different thickening power in high shear granulation. POWDER TECHNOL 2017. [DOI: 10.1016/j.powtec.2017.05.017] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Glucose-specific signaling effects on delay discounting in intertemporal choice. Physiol Behav 2017; 169:195-201. [DOI: 10.1016/j.physbeh.2016.12.001] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 11/19/2022]
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Park JB, Kim JS, Jang SW, Kweon DH, Hong EK, Shin WC, Ha SJ. Sequence analysis of KmXYL1 genes and verification of thermotolerant enzymatic activities of xylose reductase from four Kluyveromyces marxianus strains. BIOTECHNOL BIOPROC E 2016. [DOI: 10.1007/s12257-016-0363-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Ur-Rehman S, Mushtaq Z, Zahoor T, Jamil A, Murtaza MA. Xylitol: a review on bioproduction, application, health benefits, and related safety issues. Crit Rev Food Sci Nutr 2016; 55:1514-28. [PMID: 24915309 DOI: 10.1080/10408398.2012.702288] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Xylitol is a pentahydroxy sugar-alcohol which exists in a very low quantity in fruits and vegetables (plums, strawberries, cauliflower, and pumpkin). On commercial scale, xylitol can be produced by chemical and biotechnological processes. Chemical production is costly and extensive in purification steps. However, biotechnological method utilizes agricultural and forestry wastes which offer the possibilities of economic production of xylitol by reducing required energy. The precursor xylose is produced from agricultural biomass by chemical and enzymatic hydrolysis and can be converted to xylitol primarily by yeast strain. Hydrolysis under acidic condition is the more commonly used practice influenced by various process parameters. Various fermentation process inhibitors are produced during chemical hydrolysis that reduce xylitol production, a detoxification step is, therefore, necessary. Biotechnological xylitol production is an integral process of microbial species belonging to Candida genus which is influenced by various process parameters such as pH, temperature, time, nitrogen source, and yeast extract level. Xylitol has application and potential for food and pharmaceutical industries. It is a functional sweetener as it has prebiotic effects which can reduce blood glucose, triglyceride, and cholesterol level. This review describes recent research developments related to bioproduction of xylitol from agricultural wastes, application, health, and safety issues.
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Affiliation(s)
- Salim Ur-Rehman
- a National Institute of Food Science & Technology, University of Agriculture , Faisalabad , 38040 , Pakistan
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12
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Santi E, Facchin G, Faccio R, Barroso RP, Costa-Filho AJ, Borthagaray G, Torre MH. Antimicrobial evaluation of new metallic complexes with xylitol active against P. aeruginosa and C. albicans: MIC determination, post-agent effect and Zn-uptake. J Inorg Biochem 2015; 155:67-75. [PMID: 26619097 DOI: 10.1016/j.jinorgbio.2015.11.014] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2015] [Revised: 10/07/2015] [Accepted: 11/10/2015] [Indexed: 01/25/2023]
Abstract
Xylitol (xylH5) is metabolized via the pentose pathway in humans, but it is unsuitable as an energy source for many microorganisms where it produces a xylitol-induced growth inhibition and disturbance in protein synthesis. For this reason, xylitol is used in the prophylaxis of several infections. In the search of better antimicrobial agents, new copper and zinc complexes with xylitol were synthesized and characterized by analytical and spectrosco pic methods: Na2[Cu3(xylH−4)2]·NaCl·4.5H2O (Cu-xyl) and [Zn4(xylH−4)2(H2O)2]·NaCl·3H2O (Zn-xyl). Both copper and zinc complexes presented higher MIC against Pseudomona aeruginosa than the free xylitol while two different behaviors were found against Candida albicans depending on the complex. The growth curves showed that Cu-xyl presented lower activity than the free ligand during all the studied period. In the case of Znxyl the growth curves showed that the inhibition of the microorganism growth in the first stage was equivalent to that of xylitol but in the second stage (after 18 h) Zn-xyl inhibited more. Besides, the PAE (post agent effect)obtained for Zn-xyl and xyl showed that the recovery from the damage of microbial cells had a delay of 14 and 13 h respectively. This behavior could be useful in prophylaxis treatments for infectious diseases where it is important that the antimicrobial effect lasts longer. With the aim to understand the microbiological activities the analysis of the particle size, lipophilicity and Zn uptake was performed.
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Affiliation(s)
- E Santi
- Química Inorgánica (DEC), Facultad de Química (UDELAR), Gral. Flores 2124, Montevideo, Uruguay
| | - G Facchin
- Química Inorgánica (DEC), Facultad de Química (UDELAR), Gral. Flores 2124, Montevideo, Uruguay
| | - R Faccio
- Física (DETEMA), Facultad de Química (UDELAR), Gral. Flores 2124, Montevideo, Uruguay
| | - R P Barroso
- Laboratório de Biofisica Molecular, Departamento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - A J Costa-Filho
- Laboratório de Biofisica Molecular, Departamento de Física, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, Brazil
| | - G Borthagaray
- Microbiología (BIOCLIN), Facultad de Química (UDELAR), Gral. Flores 2124, Montevideo, Uruguay
| | - M H Torre
- Química Inorgánica (DEC), Facultad de Química (UDELAR), Gral. Flores 2124, Montevideo, Uruguay.
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Kim JS, Park JB, Jang SW, Ha SJ. Enhanced Xylitol Production by Mutant Kluyveromyces marxianus 36907-FMEL1 Due to Improved Xylose Reductase Activity. Appl Biochem Biotechnol 2015; 176:1975-84. [DOI: 10.1007/s12010-015-1694-z] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2015] [Accepted: 05/27/2015] [Indexed: 11/28/2022]
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Bioconversion of Birch Wood Hemicellulose Hydrolyzate to Xylitol. Appl Biochem Biotechnol 2015; 176:947-55. [DOI: 10.1007/s12010-015-1604-4] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2014] [Accepted: 04/01/2015] [Indexed: 10/23/2022]
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Koči J, Jeffery B, Riviere JE, Monteiro-Riviere NA. In vitro safety assessment of food ingredients in canine renal proximal tubule cells. Toxicol In Vitro 2015; 29:289-98. [PMID: 25458622 DOI: 10.1016/j.tiv.2014.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2014] [Revised: 11/13/2014] [Accepted: 11/15/2014] [Indexed: 01/03/2023]
Abstract
In vitro models are useful tools to initially assess the toxicological safety hazards of food ingredients. Toxicities of cinnamaldehyde (CINA), cinnamon bark oil, lemongrass oil (LGO), thymol, thyme oil (TO), clove leaf oil, eugenol, ginger root extract (GRE), citric acid, guanosine monophosphate, inosine monophosphate and sorbose (SORB) were assessed in canine renal proximal tubule cells (CPTC) using viability assay and renal injury markers. At LC50, CINA was the most toxic (0.012mg/ml), while SORB the least toxic (>100mg/ml). Toxicities (LC50) of positive controls were as follows: 4-aminophenol (0.15mg/ml in CPTC and 0.083mg/ml in human PTC), neomycin (28.6mg/ml in CPTC and 27.1mg/ml in human PTC). XYL displayed lowest cytotoxic potency (LC50=82.7mg/ml in CPTC). In vivo renal injury markers in CPTC were not significantly different from controls. The LGO toxicity mechanism was analyzed using qPCR and electron microscopy. Out of 370 genes, 57 genes (15.4%) were significantly up (34, 9.1%) or down (23, 6.2%) regulated, with the most upregulated gene gsta3 (∼200-fold) and the most affected pathway being oxidative stress. LGO induced damage of mitochondria, phospholipid accumulation and lack of a brush border. Viability assays along with mechanistic studies in the CPTC model may serve as a valuable in vitro toxicity screening tool.
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Affiliation(s)
- J Koči
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - B Jeffery
- Mars Global Food Safety Center, Yanqi Economic Development Zone, Huairou, 101407 Beijing, PR China
| | - J E Riviere
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States
| | - N A Monteiro-Riviere
- Department of Anatomy and Physiology, College of Veterinary Medicine, Kansas State University, Manhattan, KS, United States.
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Huang Z, Zeng CC, Liu HP, Li LJ. Realtime Monitoring of Xylitol Fermentation by Micro-Raman Spectroscopy. ANAL LETT 2014. [DOI: 10.1080/00032719.2014.928883] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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17
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Li Z, Qu H, Li C, Zhou X. Direct and efficient xylitol production from xylan by Saccharomyces cerevisiae through transcriptional level and fermentation processing optimizations. BIORESOURCE TECHNOLOGY 2013; 149:413-419. [PMID: 24128404 DOI: 10.1016/j.biortech.2013.09.101] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/05/2013] [Revised: 09/19/2013] [Accepted: 09/22/2013] [Indexed: 05/27/2023]
Abstract
In this study, four engineered Saccharomyces cerevisiae carrying xylanase, β-xylosidase and xylose reductase genes by different transcriptional regulations were constructed to directly convert xylan to xylitol. According to the results, the high-copy number plasmid required a rigid selection for promoter characteristics, on the contrast, the selection of promoters could be more flexible for low-copy number plasmid. For cell growth and xylitol production, glucose and galactose were found more efficient than other sugars. The semi-aerobic condition and feeding of co-substrates were taken to improve the yield of xylitol. It was found that the strain containing high-copy number plasmid had the highest xylitol yield, but it was sensitive to the change of fermentation. However, the strain carrying low-copy number plasmid was more adaptable to different processes. By optimization of the transcriptional regulation and fermentation processes, the xylitol concentration could be increased of 1.7 folds and the yield was 0.71 g xylitol/g xylan.
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Affiliation(s)
- Zhe Li
- School of Life Science, Beijing Institute of Technology, Beijing 100081, PR China
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Enhanced Production of Xylitol from Corncob by Pachysolen tannophilus Using Response Surface Methodology. INTERNATIONAL JOURNAL OF FOOD SCIENCE 2013; 2013:514676. [PMID: 26904600 PMCID: PMC4745561 DOI: 10.1155/2013/514676] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 12/26/2012] [Accepted: 06/01/2013] [Indexed: 11/17/2022]
Abstract
Optimization of the culture medium and process variables for xylitol production using corncob hemicellulose hydrolysate by Pachysolen tannophilus (MTTC 1077) was performed with statistical methodology based on experimental designs. The screening of nine nutrients for their influence on xylitol production was achieved using a Plackett-Burman design. Peptone, xylose, MgSO4·7H2O, and yeast extract were selected based on their positive influence on xylitol production. The selected components were optimized with Box-Behnken design using response surface methodology (RSM). The optimum levels (g/L) were peptone: 6.03, xylose: 10.62, MgSO4·7H2O: 1.39, yeast extract: 4.66. The influence of various process variables on the xylitol production was evaluated. The optimal levels of these variables were quantified by the central composite design using RSM, for establishment of a significant mathematical model with a coefficient determination of R2 = 0.91. The validation experimental was consistent with the prediction model. The optimum levels of process variables were temperature (36.56°C), pH (7.27), substrate concentration (3.55 g/L), inoculum size (3.69 mL), and agitation speed (194.44 rpm). These conditions were validated experimentally which revealed an enhanced xylitol yield of 0.80 g/g.
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Oh EJ, Ha SJ, Rin Kim S, Lee WH, Galazka JM, Cate JH, Jin YS. Enhanced xylitol production through simultaneous co-utilization of cellobiose and xylose by engineered Saccharomyces cerevisiae. Metab Eng 2013; 15:226-34. [DOI: 10.1016/j.ymben.2012.09.003] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2012] [Revised: 08/17/2012] [Accepted: 09/14/2012] [Indexed: 11/26/2022]
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20
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Rafiqul I, Mimi Sakinah A. Kinetic studies on acid hydrolysis of Meranti wood sawdust for xylose production. Chem Eng Sci 2012. [DOI: 10.1016/j.ces.2011.11.007] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Prakash G, Varma AJ, Prabhune A, Shouche Y, Rao M. Microbial production of xylitol from D-xylose and sugarcane bagasse hemicellulose using newly isolated thermotolerant yeast Debaryomyces hansenii. BIORESOURCE TECHNOLOGY 2011; 102:3304-8. [PMID: 21067918 DOI: 10.1016/j.biortech.2010.10.074] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/21/2010] [Revised: 10/14/2010] [Accepted: 10/15/2010] [Indexed: 05/24/2023]
Abstract
A thermotolerant yeast capable of fermenting xylose to xylitol at 40°C was isolated and identified as a strain of Debaryomyces hansenii by ITS sequencing. This paper reports the production of xylitol from D-xylose and sugarcane bagasse hemicellulose by free and Ca-alginate immobilized cells of D. hansenii. The efficiency of free and immobilized cells were compared for xylitol production from D-xylose and hemicellulose in batch culture at 40°C. The maximum xylitol produced by free cells was 68.6 g/L from 100 g/L of xylose, with a yield of 0.76 g/g and volumetric productivity 0.44 g/L/h. The yield of xylitol and volumetric productivity were 0.69 g/g and 0.28 g/L/h respectively from hemicellulosic hydrolysate of sugarcane bagasse after detoxification with activated charcoal and ion exchange resins. The Ca-alginate immobilized D. hansenii cells produced 73.8 g of xylitol from 100 g/L of xylose with a yield of 0.82 g/g and volumetric productivity of 0.46 g/L/h and were reused for five batches with steady bioconversion rates and yields.
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Affiliation(s)
- Gyan Prakash
- Biochemical Sciences Division, National Chemical Laboratory, Pune, India
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de Arruda PV, de Cássia Lacerda Brambilla Rodrigu R, da Silva DDV, de Almeida Felipe MDG. Evaluation of hexose and pentose in pre-cultivation of Candida guilliermondii on the key enzymes for xylitol production in sugarcane hemicellulosic hydrolysate. Biodegradation 2010; 22:815-22. [DOI: 10.1007/s10532-010-9397-1] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2010] [Accepted: 07/21/2010] [Indexed: 10/19/2022]
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Liaw WC, Chen CS, Chang WS, Chen KP. Xylitol Production from Rice Straw Hemicellulose Hydrolyzate by Polyacrylic Hydrogel Thin Films with Immobilized Candida subtropicalis WF79. J Biosci Bioeng 2008; 105:97-105. [DOI: 10.1263/jbb.105.97] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2007] [Accepted: 11/02/2007] [Indexed: 11/17/2022]
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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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Rahman SHA, Choudhury JP, Ahmad AL, Kamaruddin AH. Optimization studies on acid hydrolysis of oil palm empty fruit bunch fiber for production of xylose. BIORESOURCE TECHNOLOGY 2007; 98:554-9. [PMID: 16647852 DOI: 10.1016/j.biortech.2006.02.016] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/25/2005] [Revised: 01/09/2006] [Accepted: 02/06/2006] [Indexed: 05/08/2023]
Abstract
Oil palm empty fruit bunch fiber is a lignocellulosic waste from palm oil mills. It is a potential source of xylose which can be used as a raw material for production of xylitol, a high value product. The increasing interest on use of lignocellulosic waste for bioconversion to fuels and chemicals is justifiable as these materials are low cost, renewable and widespread sources of sugars. The objective of the present study was to determine the effect of H(2)SO(4) concentration, reaction temperature and reaction time for production of xylose. Batch reactions were carried out under various reaction temperature, reaction time and acid concentrations and Response Surface Methodology (RSM) was followed to optimize the hydrolysis process in order to obtain high xylose yield. The optimum reaction temperature, reaction time and acid concentration found were 119 degrees C, 60 min and 2%, respectively. Under these conditions xylose yield and selectivity were found to be 91.27% and 17.97 g/g, respectively.
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Affiliation(s)
- S H A Rahman
- School of Chemical Engineering, Engineering Campus, Universiti Sains Malaysia, 14300 Nibong Tebal, SPS Penang, Malaysia
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Cunha MAA, Rodrigues RCB, Santos JC, Converti A, da Silva SS. Repeated-Batch Xylitol Bioproduction Using Yeast Cells Entrapped in Polyvinyl Alcohol–Hydrogel. Curr Microbiol 2007; 54:91-6. [PMID: 17211545 DOI: 10.1007/s00284-005-0465-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2005] [Accepted: 06/13/2006] [Indexed: 12/01/2022]
Abstract
Xylose-to-xylitol conversion was investigated in a bench-scale bioreactor using Candida guilliermondii cells entrapped within polyvinyl alcohol-hydrogel beads in a system operated in repeated-batch mode with cell recycling. Yeast-viable cells were immobilized in the support using the freezing-thawing method. Bioconversion assays were performed in a stirred tank reactor operated at 400-rpm agitation speed, 30 degrees C temperature, and 1.04-vvm air flow rate. The system was explored during six successive cycles, and a small decrease in the conversion performance in the fifth cycle was observed, but the biocatalytic activity of the microorganism was recovered in the sixth cycle after washing the particles. During the process, the hydrogel beads maintained their shape and size without appreciable deterioration. Xylitol production, yield factor, and volumetric productivity increased with progressive recycling of cells and achieved their maximum values (P(F) = 39.7 g l(-1); Y(P/S) = 0.77 g g(-1); Q(P) = 0.53 g l(-1) h(-1), respectively) after the third cell recycling, probably because of cells' adaptation to the medium.
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Affiliation(s)
- M A A Cunha
- Department of Biotechnology, Faculty of Chemical Engineering, Lorena, Rodovia Itajubá-Lorena, Km 74.5, C.P. 116, 12600-970, Lorena-SP, Brazil
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Kwon DH, Kim MD, Lee TH, Oh YJ, Ryu YW, Seo JH. Elevation of glucose 6-phosphate dehydrogenase activity increases xylitol production in recombinant Saccharomyces cerevisiae. ACTA ACUST UNITED AC 2006. [DOI: 10.1016/j.molcatb.2006.06.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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CHEN LIFU, GONG CHENGSHUNG. Fermentation of Sugarcane Bagasse Hemicellulose Hydrolysate to Xylitol by a Hydrolysate-Acclimatized Yeast. J Food Sci 2006. [DOI: 10.1111/j.1365-2621.1985.tb13315.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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29
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Rahman S, Choudhury J, Ahmad A. Production of xylose from oil palm empty fruit bunch fiber using sulfuric acid. Biochem Eng J 2006. [DOI: 10.1016/j.bej.2006.02.009] [Citation(s) in RCA: 99] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Marton JM, Felipe MGA, Almeida e Silva JB, Pessoa Júnior A. Evaluation of the activated charcoals and adsorption conditions used in the treatment of sugarcane bagasse hydrolysate for xylitol production. BRAZILIAN JOURNAL OF CHEMICAL ENGINEERING 2006. [DOI: 10.1590/s0104-66322006000100002] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- J. M. Marton
- School of Chemical Engineering at Lorena, Brazil
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31
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Gurpilhares DB, Pessoa A, Roberto IC. Glucose-6-phosphate dehydrogenase and xylitol production by Candida guilliermondii FTI 20037 using statistical experimental design. Process Biochem 2006. [DOI: 10.1016/j.procbio.2005.08.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Mayerhoff ZDVL, Roberto IC, Franco TT. Response surface methodology as an approach to determine the optimal activities of xylose reductase and xylitol dehydrogenase enzymes from Candida Mogii. Appl Microbiol Biotechnol 2006; 70:761-7. [PMID: 16505992 DOI: 10.1007/s00253-005-0304-3] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2005] [Revised: 12/08/2005] [Accepted: 12/16/2005] [Indexed: 11/25/2022]
Abstract
A central composite experimental design leading to a set of 16 experiments with different combinations of pH and temperature was performed to attain the optimal activities of xylose reductase (XR) and xylitol dehydrogenase (XDH) enzymes from Candida mogii cell extract. Under optimized conditions (pH 6.5 and 38 degrees C), the XR and XDH activities were found to be 0.48 U/ml and 0.22 U/ml, respectively, resulting in an XR to XDH ratio of 2.2. Stability, cofactor specificity and kinetic parameters of the enzyme XR were also evaluated. XR activity remained stable for 3 h under 4 and 38 degrees C and for 4 months of storage at -18 degrees C. Studies on cofactor specificity showed that only NADPH-dependent XR was obtained under the cultivation conditions employed. The XR present in C. mogii extracts showed a superior Km value for xylose when compared with other yeast strains. Besides, this parameter was not modified after enzyme extraction by aqueous two-phase system.
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Affiliation(s)
- Zea D V L Mayerhoff
- National Institute of Industrial Property (INPI), Documentation and Technological Information Center-CEDIN, 20083-900, Rio de Janeiro, RJ, Brazil.
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Kwon SG, Park SW, Oh DK. Increase of xylitol productivity by cell-recycle fermentation of Candida tropicalis using submerged membrane bioreactor. J Biosci Bioeng 2006; 101:13-8. [PMID: 16503285 DOI: 10.1263/jbb.101.13] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2005] [Accepted: 09/20/2005] [Indexed: 11/17/2022]
Abstract
Candida tropicalis, an osmophilic strain isolated from honeycomb, produced xylitol at a maximal volumetric productivity of 3.5 g l(-1) h(-1) from an initial xylose concentration of 200 g l(-1). Even at a very high xylose concentration, e.g., 350 g l(-1), this strain produced xylitol at a moderate rate of 2.07 g l(-1) h(-1). In a fed-batch fermentation of xylose and glucose, 260 g l(-1) xylose was added, and the xylitol production was 234 g l(-1) for 48 h, corresponding to a rate of 4.88 g l(-1) h(-1). To increase xylitol productivity, cells were recycled in a submerged membrane bioreactor with suction pressure and air sparging. For each recycle round in cell-recycle fermentation, the average concentration of xylitol produced, fermentation time, volumetric productivity, and product yield were 180 g l(-1), 19.5 h, 8.5 g l(-1) h(-1), and 85%, respectively. When cell-recycle fermentation was started with the cell mass concentrated twofold after batch fermentation and performed for 10 recycle rounds, we achieved a very high productivity of 12 g l(-1) h(-1). The productivity and total amount of xylitol in cell-recycle fermentation were 3.4- and 11.0-fold higher than those in batch fermentation, respectively.
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Affiliation(s)
- Soun-Gyu Kwon
- Department of Bioscience and Biotechnology, Sejong University, 98 Gunja-dong, Gwangin-gu, Seoul 143-747, Korea
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Production of xylitol by recombinant Saccharomyces cerevisiae containing xylose reductase gene in repeated fed-batch and cell-recycle fermentations. Enzyme Microb Technol 2004. [DOI: 10.1016/j.enzmictec.2004.08.006] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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35
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Eucalyptus hydrolysate detoxification with activated charcoal adsorption or ion-exchange resins for xylitol production. Process Biochem 2004. [DOI: 10.1016/j.procbio.2003.09.009] [Citation(s) in RCA: 62] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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36
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Mayerhoff ZD, Roberto IC, Franco TT. Purification of xylose reductase from Candida mogii in aqueous two-phase systems. Biochem Eng J 2004. [DOI: 10.1016/j.bej.2003.09.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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37
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Lee JK, Koo BS, Kim SY. Cloning and characterization of the xyl1 gene, encoding an NADH-preferring xylose reductase from Candida parapsilosis, and its functional expression in Candida tropicalis. Appl Environ Microbiol 2004; 69:6179-88. [PMID: 14532079 PMCID: PMC201247 DOI: 10.1128/aem.69.10.6179-6188.2003] [Citation(s) in RCA: 97] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Xylose reductase (XR) is a key enzyme in D-xylose metabolism, catalyzing the reduction of D-xylose to xylitol. An NADH-preferring XR was purified to homogeneity from Candida parapsilosis KFCC-10875, and the xyl1 gene encoding a 324-amino-acid polypeptide with a molecular mass of 36,629 Da was subsequently isolated using internal amino acid sequences and 5' and 3' rapid amplification of cDNA ends. The C. parapsilosis XR showed high catalytic efficiency (kcat/Km = 1.46 s(-1) mM(-1)) for D-xylose and showed unusual coenzyme specificity, with greater catalytic efficiency with NADH (kcat/Km = 1.39 x 10(4) s(-1) mM(-1)) than with NADPH (kcat/Km = 1.27 x 10(2) s(-1) mM(-1)), unlike all other aldose reductases characterized. Studies of initial velocity and product inhibition suggest that the reaction proceeds via a sequentially ordered Bi Bi mechanism, which is typical of XRs. Candida tropicalis KFCC-10960 has been reported to have the highest xylitol production yield and rate. It has been suggested, however, that NADPH-dependent XRs, including the XR of C. tropicalis, are limited by the coenzyme availability and thus limit the production of xylitol. The C. parapsilosis xyl1 gene was placed under the control of an alcohol dehydrogenase promoter and integrated into the genome of C. tropicalis. The resulting recombinant yeast, C. tropicalis BN-1, showed higher yield and productivity (by 5 and 25%, respectively) than the wild strain and lower production of by-products, thus facilitating the purification process. The XRs partially purified from C. tropicalis BN-1 exhibited dual coenzyme specificity for both NADH and NADPH, indicating the functional expression of the C. parapsilosis xyl1 gene in C. tropicalis BN-1. This is the first report of the cloning of an xyl1 gene encoding an NADH-preferring XR and its functional expression in C. tropicalis, a yeast currently used for industrial production of xylitol.
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Affiliation(s)
- Jung-Kul Lee
- BioNgene Co., Ltd., Jongro-Ku, Seoul 110-521, Korea.
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Norkus E, Vaiciūniene J, Vuorinen T, Gaidamauskas E, Reklaitis J, Jääskeläinen AS, Crans DC. Cu(II) complex formation with xylitol in alkaline solutions. Carbohydr Res 2004; 339:599-605. [PMID: 15013396 DOI: 10.1016/j.carres.2003.12.003] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2003] [Revised: 12/02/2003] [Accepted: 12/05/2003] [Indexed: 11/23/2022]
Abstract
The formation of four Cu(II)-xylitol complexes was observed in aqueous alkaline solutions (11.0< or =pH< or =14.0, I=1.0, 20 degrees C) by means of direct current polarography and VIS spectrophotometry. Mononuclear hydroxy complexes, CuXyl(OH)- (log beta=17.7 +/- 0.5), CuXyl(OH)2(2-) (log beta=20.2 +/- 0.3) and CuXyl2(OH)2(4-) (log beta=22.4 +/- 0.3), are formed at high ligand-to-metal ratios (L:M> or =10), whereas dinuclear complex Cu2Xyl (log beta=29.2 +/- 0.3) is the predominant species at low ligand-to-metal ratio (L:M=0.5). Diffusion coefficients and molar absorptivities of the complex species were determined. pH variable 13C NMR suggested that pKa values of xylitol are rather similar and equal to 13.8 +/- 0.2, 13.9 +/- 0.1 and 13.9 +/- 0.2 for OH-groups adjacent to (C-1,C-5), (C-3) and (C-2,C-4) carbon atoms, respectively.
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Affiliation(s)
- Eugenijus Norkus
- Laboratory of Catalysis, Institute of Chemistry, A Gostauto 9, LT-2600 Vilnius, Lithuania.
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39
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Jeun YS, Kim MD, Park YC, Lee TH, Yoo MS, Ryu YW, Seo JH. Expression of Azotobacter vinelandii soluble transhydrogenase perturbs xylose reductase-mediated conversion of xylose to xylitol by recombinant Saccharomyces cerevisiae. ACTA ACUST UNITED AC 2003. [DOI: 10.1016/j.molcatb.2003.07.003] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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40
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Kim MD, Jeun YS, Kim SG, Ryu YW, Seo JH. Comparison of xylitol production in recombinant Saccharomyces cerevisiae strains harboring XYL1 gene of Pichia stipitis and GRE3 gene of S. cerevisiae. Enzyme Microb Technol 2002. [DOI: 10.1016/s0141-0229(02)00192-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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41
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Aguiar WB, Faria LF, Couto MA, Araujo OQ, Pereira N. Growth model and prediction of oxygen transfer rate for xylitol production from d-xylose by C. guilliermondii. Biochem Eng J 2002. [DOI: 10.1016/s1369-703x(02)00040-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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42
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Stable expression of xylose reductase gene enhances xylitol production in recombinant Saccharomyces cerevisiae. Enzyme Microb Technol 2002. [DOI: 10.1016/s0141-0229(02)00062-5] [Citation(s) in RCA: 42] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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43
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Lee WJ, Ryu YW, Seo JH. Characterization of two-substrate fermentation processes for xylitol production using recombinant Saccharomyces cerevisiae containing xylose reductase gene. Process Biochem 2000. [DOI: 10.1016/s0032-9592(00)00165-5] [Citation(s) in RCA: 44] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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44
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Nidetzky B, Neuhauser W, Haltrich D, Kulbe KD. Continuous enzymatic production of xylitol with simultaneous coenzyme regeneration in a charged membrane reactor. Biotechnol Bioeng 2000; 52:387-96. [DOI: 10.1002/(sici)1097-0290(19961105)52:3<387::aid-bit4>3.0.co;2-g] [Citation(s) in RCA: 80] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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45
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Nidetzky B, Neuhauser W, Haltrich D, Kulbe KD. Continuous enzymatic production of xylitol with simultaneous coenzyme regeneration in a charged membrane reactor. Biotechnol Bioeng 2000. [DOI: 10.1002/(sici)1097-0290(19961105)52:3%3c387::aid-bit4%3e3.0.co;2-g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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46
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Suryadi H, Katsuragi T, Yoshida N, Suzuki S, Tani Y. Polyol production by culture of methanol-utilizing yeast. J Biosci Bioeng 2000; 89:236-40. [PMID: 16232735 DOI: 10.1016/s1389-1723(00)88825-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/1999] [Accepted: 12/02/1999] [Indexed: 11/30/2022]
Abstract
Four methanol-utilizing yeasts, Candida boidinii, Hansenula polymorpha, Hansenula ofunaensis, and Pichia pinus, produced polyols from corresponding sugars in a methanol medium. H. polymorpha produced larger amounts of xylitol than the other yeasts. Productivity was the highest at pH 8 when 5 g (dry)/l cultured cells were incubated with 2.5 g/l urea as the nitrogen source in a medium containing 1% (v/v) methanol and 1 g/l MgSO4.7H2O. Under these conditions, 57 g/l xylitol was obtained from 110 g/l D-xylose after 3 d of cultivation. The largest amount of xylitol (58 g/l; yield, 0.62 g/g) was produced from 125 g/l, D-xylose and 5% (w/v) glycerol instead of methanol after 4 d of cultivation.
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Affiliation(s)
- H Suryadi
- Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama-cho, Ikoma City, Nara 630-0101, Japan
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47
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Rodrigues DCGA, da Silva SS, Felipe MGA. Fed-batch culture of Candida guilliermondii FTI 20037 for xylitol production from sugar cane bagasse hydrolysate. Lett Appl Microbiol 1999. [DOI: 10.1046/j.1472-765x.1999.00639.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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48
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Häcker B, Habenicht A, Kiess M, Mattes R. Xylose utilisation: cloning and characterisation of the Xylose reductase from Candida tenuis. Biol Chem 1999; 380:1395-403. [PMID: 10661866 DOI: 10.1515/bc.1999.179] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Xylose reductases catalyse the initial reaction in the xylose utilisation pathway, the NAD(P)H+H+ dependent reduction of xylose to xylitol. In this work, the xylose reductase gene from Candida tenuis CBS 4435 was cloned and successfully expressed in E. coli. From the purified and partially sequenced protein primers were deduced for PCR. The fragment obtained was used for Southern blot analysis and screening of a subgenomic library. The clone containing the open reading frame was sequenced; the gene consisted of 969 nucleotides coding for a 322 amino acids protein with a molecular mass of 36 kDa. Putative regulatory signals were identified with the help of a Saccharomyces cerevisiae regulatory sequence database. In order to express the xylose reductase in E. coli, the gene was placed under positive and negative control. At low temperatures, the xylose reductase was expressed in soluble and active form up to about 10% of the soluble protein; with rising temperatures formation of visible inclusion bodies occurred. In refolding experiments we were able to recover the major portion of xylose reductase activity from the pellet fraction.
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Affiliation(s)
- B Häcker
- Institut für Industrielle Genetik, Universität Stuttgart, Germany
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Abstract
The effect of redox potential on xylitol production by Candida parapsilosis was investigated. The redox potential was found to be useful for monitoring the dissolved oxygen (DO) level in culture media, especially when the DO level was low. An increase in the agitation speed in a 5 L fermentor resulted in an increased culture redox potential as well as enhanced cell growth. Production of xylitol was maximized at a redox potential of 100 mV. As the initial cell concentration increased from 8 g/L to 30 g/L, the volumetric productivity of xylitol increased from 1.38 g/L. h to 4.62 g/L. h. A two-stage xylitol production strategy was devised, with stage 1 involving rapid production of cells under well-aerated conditions, and stage 2 involving cultivation with reduced aeration such that the culture redox potential was 100 mV. Using this technique, a final xylitol concentration of 180 g/L was obtained from a culture medium totally containing 254.5 g/L xylose in a 3,000 L pilot scale fermentor after 77 h fermentation. The volumetric productivity of xylitol during the fermentation was 2.34 g/L. h.
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Affiliation(s)
- D K Oh
- Department of Food Science and Technology, Woosuk University, Cheonju 565-800, Korea.
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50
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