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1.
A new bacterial strain producing succinic acid was enriched from bovine rumen content. It is facultatively anaerobic, belongs
to the family Pasteurellaceae and has similarity to the genus Mannheimia. In batch cultivations with D-glucose or sucrose the strain produced up to 5.8 g succinic acid l−1 with a productivity and a yield of up to 1.5 g l−1 h−1 and 0.6 g g−1, respectively. With crude glycerol up to 8.4 g l−1, 0.9 g l−1 h−1 and 1.2 g g−1 were obtained.
Electronic supplementary material The online version of this article (doi:) contains supplementary material, which is available to authorized users. 相似文献
2.
An efficient succinic acid production process in a metabolically engineered <Emphasis Type="Italic">Corynebacterium glutamicum</Emphasis> strain 总被引:1,自引:0,他引:1
Okino S Noburyu R Suda M Jojima T Inui M Yukawa H 《Applied microbiology and biotechnology》2008,81(3):459-464
A Corynebacterium glutamicum strain (ΔldhA-pCRA717) that overexpresses the pyc gene encoding pyruvate carboxylase while simultaneously exhibiting a disrupted ldhA gene encoding l-lactate dehydrogenase was investigated in detail for succinic acid production. Succinic acid was shown to be efficiently
produced at high-cell density under oxygen deprivation with intermittent addition of sodium bicarbonate and glucose. Succinic
acid concentration reached 1.24 M (146 g l−1) within 46 h. The yields of succinic acid and acetic acid from glucose were 1.40 mol mol−1 (0.92 g g−1) and 0.29 mol mol−1 (0.10 g g−1), respectively. The succinic acid production rate and yield depended on medium bicarbonate concentration rather than glucose
concentration. Consumption of bicarbonate accompanied with succinic acid production implied that added bicarbonate was used
for succinic acid synthesis. 相似文献
3.
Instead of the conventional carbon sources used for propionic acid biosynthesis, the utilization of glycerol is considered
here, since the metabolic pathway involved in the conversion of glycerol to propionic acid is redox-neutral and energetic.
Three strains, Propionibacterium acidipropionici, Propionibacterium acnes and Clostridium propionicum were tested for their ability to convert glycerol to propionic acid during batch fermentation with initially 20 g/l glycerol.
P. acidipropionici showed higher efficiency in terms of fermentation time and conversion yield than did the other strains. The fermentation
profile of this bacterium consisted in propionic acid as the major product (0.844 mol/mol), and in minimal by-products: succinic
(0.055 mol/mol), acetic (0.023 mol/mol) and formic (0.020 mol/mol) acids and n-propanol (0.036 mol/mol). The overall propionic acid productivity was 0.18 g l−1h−1. A comparative study with glucose and lactic acid as carbon sources showed both less diversity in end-product composition
and a 17% and 13% lower propionic acid conversion yield respectively than with glycerol. Increasing the initial glycerol concentration
resulted in an enhanced productivity up to 0.36 g l−1h−1 and in a maximal propionic acid concentration of 42 g/l, while a slight decrease of the conversion yield was noticed. Such
a propionic acid production rate was similar or higher than the values obtained with lactic acid (0.35 g l−1h−1) or glucose (0.28 g l−1h−1). These results demonstrated that glycerol is a carbon source of interest for propionic acid production.
Received: 15 July 1996 / Received revision: 11 November 1996 / Accepted: 11 November 1996 相似文献
4.
A comparative study was carried out in anaerobic batch cultures on 20 g/l of either glycerol or glucose using two propionibacteria
strains, Propionibacterium acidipropionici and Propionibacterium freudenreichii ssp. shermanii. In all cases, fermentation end-products were the same and consisted of propionic acid as the major product, acetic acid
as the main by-product and two minor metabolites, n-propanol and succinic acid. Evidence was provided that greater production of propionic acid by propionibacteria was obtained
with glycerol as carbon and energy sources. P. acidipropionici showed higher efficiency in glycerol conversion to propionic acid with a faster substrate consumption (0.64 g l−1 h−1) and a higher propionic acid production (0.42 g l−1 h−1 and 0.79 mol/mol). The almost exclusive production of propionic acid from glycerol by this bacterium suggested an homopropionic
tendency of this fermentation. Acetic acid final concentration was two times lower on glycerol (2 g/l) than on glucose (4 g/l)
for both micro-organisms. P. freudenreichii ssp. shermanii exhibited a glycerol fermentation pattern typical of non-associated glycerol-consumption-product formation. This could indicate
a particular metabolism for P. freudenreichii ssp. shermanii oriented towards the production of other specific components. These results tend to show that glycerol could be an excellent
alternative to conventional carbon sources such as carbohydrates for propionic acid production.
Received: 21 May 1999 / Accepted: 1 November 1999 相似文献
5.
Batch and continuous cultivation of Anaerobiospirillum succiniciproducens for the production of succinic acid from whey 总被引:3,自引:0,他引:3
Batch and continuous cultivation of Anaerobiospirillum succiniciproducens were systematically studied for the production of succinic acid from whey. Addition of 2.5 g l−1 yeast extract and 2.5 g l−1 polypeptone per 10 g l−1 whey was most effective for succinic acid production from both treated and nontreated whey. When 20 g l−1 nontreated whey and 7 g l−1 glucose were used as cosubstrates, the yield and productivity of succinic acid reached at the end of fermentation were 95%
and 0.46 g (l h)−1, respectively. These values were higher than those obtained using nontreated whey alone [93% and 0.24 g (l h)−1 for 20 g l−1 whey]. Continuous fermentation of A. succiniciproducens at an optimal dilution rate resulted in the production of succinic acid with high productivity [1.35 g (l h)−1], high conversion yield (93%), and higher ratio of succinic acid to acetic acid (5.1:1) from nontreated whey.
Received: 23 July 1999 / Received revision: 17 November 1999 / Accepted: 24 December 1999 相似文献
6.
Succinic acid, a four-carbon diacid, has been the focus of many research projects aimed at developing more economically viable
methods of fermenting sugar-containing natural materials. Succinic acid fermentation processes also consume CO2, thereby potentially contributing to reductions in CO2 emissions. Succinic acid could also become a commodity used as an intermediate in the chemical synthesis and manufacture
of synthetic resins and biodegradable polymers. Much attention has been given recently to the use of microorganisms to produce
succinic acid as an alternative to chemical synthesis. We have attempted to maximize succinic acid production by Actinobacillus succinogenes using an experimental design methodology for optimizing the concentrations of the medium components. The first experiment
consisted of a 24−1 fractional factorial design, and the second entailed a Central Composite Rotational Design so as to achieve optimal conditions.
The optimal concentrations of nutrients predicted by the model were: NaHCO3, 10.0 g l−1; MgSO4, 3.0 g l−1; yeast extract, 2.0 g l−1; KH2PO4. 5.0 g l−1; these were experimentally validated. Under the best conversion conditions, as determined by statistical analysis, the production
of succinic acid was carried out in an instrumented bioreactor using sugarcane bagasse hemicellulose hydrolysate, yielding
a concentration of 22.5 g l−1. 相似文献
7.
Production of 1,3-Propanediol by Clostridium butyricum VPI 3266 in continuous cultures with high yield and productivity 总被引:2,自引:0,他引:2
González-Pajuelo M Andrade JC Vasconcelos I 《Journal of industrial microbiology & biotechnology》2005,32(9):391-396
The effects of dilution rate and substrate feed concentration on continuous glycerol fermentation by Clostridium butyricum VPI 3266, a natural 1,3-propanediol producer, were evaluated in this work. A high and constant 1,3-propanediol yield (around
0.65 mol/mol), close to the theoretical value, was obtained irrespective of substrate feed concentration or dilution rate.
Improvement of 1,3-propanediol volumetric productivity was achieved by increasing the dilution rate, at a fixed feed substrate
concentration of 30, 60 or 70 g l−1. Higher 1,3-propanediol final concentrations and volumetric productivities were also obtained when glycerol feed concentration
was increased from 30 to 60 g l−1, at D=0.05–0.3 h−1, and from 60–70 g l−1, at D=0.05 and 0.1 h−1·30 g l−1 of 1,3-propanediol and the highest reported value of productivity, 10.3 g l−1 h−1, was achieved at D=0.30 h−1 and 60 g l−1 of feed glycerol. A switch to an acetate/butyrate ratio higher than one was observed for 60 g l−1 of feed glycerol and a dilution rate higher than 0.10 h−1; moreover, at D=0.30 h−1 3-hydroxypropionaldehyde accumulation was observed for the first time in the fermentation broth of C. butyricum. 相似文献
8.
Dan Wang Qiang Li Yu Mao Jianmin Xing Zhiguo Su 《Applied microbiology and biotechnology》2010,87(6):2025-2035
Escherichia coli strains with foreign genes under the isopropyl-β-d-thiogalactopyranoside-inducible promoters such as lac, tac, and trc were engineered and considered as the promising succinic acid-producing bacteria in many reports. The promoters mentioned
above could also be induced by lactose, which had not been attempted for succinic acid production before. Here, the efficient
utilization of lactose as inducer was demonstrated in cultures of the ptsG, ldhA, and pflB mutant strain DC1515 with ppc overexpression. A fermentative process for succinic acid production at high level by this strain was developed. In flask
anaerobic culture, 14.86 g l−1 succinic acid was produced from 15 g l−1 glucose with a yield of 1.51 mol mol−1 glucose. In two-stage culture carried out in a 3-l bioreactor, the overall yield and concentration of succinic acid reached
to 1.67 mol mol−1 glucose and 99.7 g l−1, respectively, with a productivity of 1.7 g l−1 h−1 in the anaerobic stage. The efficient utilization of lactose as inducer made recombinant E. coli a more capable strain for succinic acid production at large scale. 相似文献
9.
Mannheimia succiniciproducens is a capnophilic gram-negative bacterium isolated from bovine rumen. Wild-type M. succiniciproducens can produce succinic acid as a major fermentation product with acetic, formic, and lactic acids as byproducts during the
anaerobic cultivation using several different carbon sources. Succinic acid is an important C4 building block chemical for
many applications. Here, we review the progress made with M. succiniciproducens for efficient succinic acid production; the approaches taken towards the development of an integrated process for succinic
acid production are described, which include strain isolation and characterization, complete genome sequencing and annotation,
development of genetic tools for metabolic engineering, strain development by systems approach of integrating omics and in
silico metabolic analysis, and development of fermentation and recovery processes. We also describe our current effort on
further improving the performance of M. succiniciproducens and optimizing the mid- and downstream processes. Finally, we finish this mini-review by discussing the issues that need
to be addressed to make this process of fermentative succinic acid production employing M. succiniciproducens to reach the industrial-scale process. 相似文献
10.
Waldemar Rymowicz Alina R. Fatykhova Svetlana V. Kamzolova Anita Rywińska Igor G. Morgunov 《Applied microbiology and biotechnology》2010,87(3):971-979
Yarrowia lipolytica A-101-1.22 produces high citric acid (112 g l−1) with a yield of 0.6 g g−1 and a productivity of 0.71 g l−1 h−1 during batch cultivation in the medium with glycerol-containing waste of biodiesel industry. However, it was observed that
the specific citric acid production rate, which was maximal at the beginning of the biosynthesis, gradually decreases in the
late production phase and it makes continuation of the process over 100 h pointless. The cell recycle and the repeated batch
regimes were performed as ways for prolongation of citric acid synthesis by yeast. Using cell recycle, the active citric acid
biosynthesis (96–107 g l−1) with a yield of 0.64 g g−1 and a productivity of 1.42 g l−1 h−1 was prolongated up to 300 h. Repeated batch culture remained stable for over 1000 h; the RB variant of 30% feed every 3 days
showed the best results: 124.2 g l-1 citric acid with a yield of 0.77 g g-1 and a productivity of 0.85 g l-1 h-1. 相似文献
11.
A. Quesada-Chanto M. M. Silveira A. C. Schmid-Meyer A. G. Schroeder J. P. C. L. da Costa J. López M. F. Carvalho-Jonas M. J. Artolozaga R. Jonas 《Applied microbiology and biotechnology》1998,49(6):732-736
Propionibacterium shermanii CDB 10014 is able to grow even at high oxygen transfer rates (24.0 mmol O2 l−1 h−1), in contrast to reports in the specialised literature, where all Propionibacteria are considered oxygen-sensitive microorganisms.
Propionic acid is the main product in anaerobiosis. The presence of oxygen in the system leads to an inhibition of propionic
acid production while acetic acid formation is enhanced. At high oxygen supply rates no propionic acid is produced and acetic
acid is the main product. Lactic acid is also produced in reasonable quantities (2.7 g l−1). The growth rate (μmax) is higher in anaerobiosis (0.19 h−1) than in aerobiosis (0.12–0.15 h−1). The cell yield is higher in aerobiosis (0.18–0.22 g g−1) than in anaerobiosis (0.14 g g−1) suggesting the oxidative metabolism of glucose by Propionibacterium shermanii CDB 10014. No corrinoid production was detected at oxygen transfer rates of more than 13.6 mmol l−1 h−1.
Received: 10 September 1997 / Received revision: 6 January 1998 / Accepted: 9 January 1998 相似文献
12.
An acetate-negative mutant of Yarrowia lipolytica Wratislavia K1 was selected that, when grown with 300 g raw glycerol l−1 at pH 3, produced 170 g erythritol l−1 after 7 days, corresponding to a 56% yield and a productivity of 1 g l−1 h−1. The Wratislavia K1 strain did not produce citric acid. 相似文献
13.
Butanol, a four-carbon primary alcohol (C4H10O), is an important industrial chemical and has a good potential to be used as a superior biofuel. Bio-based production of
butanol from renewable feedstock is a promising and sustainable alternative to substitute petroleum-based fuels. Here, we
report the development of a process for butanol production from glycerol, which is abundantly available as a byproduct of
biodiesel production. First, a hyper butanol producing strain of Clostridium pasteurianum was isolated by chemical mutagenesis. The best mutant strain, C. pasteurianum MBEL_GLY2, was able to produce 10.8 g l−1 butanol from 80 g l−1 glycerol as compared to 7.6 g l−1 butanol produced by the parent strain. Next, the process parameters were optimized to maximize butanol production from glycerol.
Under the optimized batch condition, the butanol concentration, yield, and productivity of 17.8 g l−1, 0.30 g g−1, and 0.43 g l−1 h−1 could be achieved. Finally, continuous fermentation of C. pasteurianum MBEL_GLY2 with cell recycling was carried out using glycerol as a major carbon source at several different dilution rates.
The continuous fermentation was run for 710 h without strain degeneration. The acetone–butanol–ethanol productivity and the
butanol productivity of 8.3 and 7.8 g l−1 h−1, respectively, could be achieved at the dilution rate of 0.9 h−1. This study reports continuous production of butanol with reduced byproducts formation from glycerol using C. pasteurianum, and thus could help design a bioprocess for the improved production of butanol. 相似文献
14.
Continuous production of l(+)-lactic acid by Lactobacillus casei in two-stage systems 总被引:2,自引:0,他引:2
Bruno-Bárcena JM Ragout AL Córdoba PR Siñeriz F 《Applied microbiology and biotechnology》1999,51(3):316-324
A two-stage two-stream chemostat system and a two-stage two-stream immobilized upflow packed-bed reactor system were used
for the study of lactic acid production by Lactobacillus casei subsp casei. A mixing ratio of D
12/D
2 = 0.5 (D = dilution rate) resulted in optimum production, making it possible to generate continuously a broth with high lactic acid
concentration (48 g l−1) and with a lowered overall content of initial yeast extract (5 g l−1), half the concentration supplied in the one-step process. In the two-stage chemostat system, with the first stage at pH
5.5 and 37 °C and a second stage at pH 6.0, a temperature change from 40 °C to 45 °C in the second stage resulted in a 100%
substrate consumption at an overall dilution rate of 0.05 h−1. To increase the cell mass in the system, an adhesive strain of L. casei was used to inoculate two packed-bed reactors, which operated with two mixed feedstock streams at the optimal conditions
found above. Lactic acid fermentation started after a lag period of cell growth over foam glass particles. No significant
amount of free cells, compared with those adhering to the glass foam, was observed during continuous lactic acid production.
The extreme values, 57.5 g l−1 for lactic acid concentration and 9.72 g l−1 h−1 for the volumetric productivity, in upflow packed-bed reactors were higher than those obtained for free cells (48 g l−1 and 2.42 g l−1 h−1) respectively and the highest overall l(+)-lactic acid purity (96.8%) was obtained in the two-chemostat system as compared with the immobilized-cell reactors (93%).
Received: 4 December 1997 / Received revision: 23 February 1998 / Accepted: 14 March 1998 相似文献
15.
Lactic acid production was investigated for batch and repeated batch cultures of Enterococcus faecalis RKY1, using wood hydrolyzate and corn steep liquor. When wood hydrolyzate (equivalent to 50 g l−1 glucose) supplemented with 15–60 g l−1 corn steep liquor was used as a raw material for fermentation, up to 48.6 g l−1 of lactic acid was produced with, volumetric productivities ranging between 0.8 and 1.4 g l−1 h−1. When a medium containing wood hydrolyzate and 15 g l−1 corn steep liquor was supplemented with 1.5 g l−1 yeast extract, we observed 1.9-fold and 1.6-fold increases in lactic acid productivity and cell growth, respectively. In this case, the nitrogen source cost for producing 1 kg lactic acid can be reduced to 23% of that for fermentation from wood hydrolyzate using 15 g l−1 yeast extract as a single nitrogen source. In addition, lactic acid productivity could be maximized by conducting a cell-recycle repeated batch culture of E. faecalis RKY1. The maximum productivity for this process was determined to be 4.0 g l−1 h−1. 相似文献
16.
Teodoro JC Baptista-Neto A Cruz-Hernández IL Hokka CO Badino AC 《Applied microbiology and biotechnology》2006,72(3):450-455
First, the effect of different levels of nitrogen source on clavulanic acid (CA) production was evaluated in batch cultivations utilizing complex culture medium containing glycerol and three different levels of soy protein isolate (SPI). Cellular growth, evaluated in terms of the rheological parameter K, was highest with a SPI concentration of 30 g.L−1 (4.42 g.L−1 N total). However, the highest production of CA (380 mg.L−1) was obtained when an intermediate concentration of 20 g.L−1 of SPI (2.95 g.L−1 total N) was used. To address this, the influences of volumetric flow rate (F) and glycerol concentration in the complex feed medium (CsF) in fed-batch cultivations were investigated. The best experimental condition for CA production was F=0.01 L.h−1 and CsF=120 g.L−1, and under these conditions maximum CA production was practically twice that obtained in the batch cultivation. A single empirical equation was proposed to relate maximum CA production with F and CsF in fed-batch experiments. 相似文献
17.
The potential use of spin filter device to retainPropionibacterium acidipropionici in the bioreactor under continuous mode of fermentation and improve propionic acid productivity, was examined. The yield
of propionic acid based on lactose concentration was 51% in batch and 54% in continuous (dilution rate=0.05 h−1) operation. The yield in continuous fermentation with cell retention using spin filter of 10 micron size (dilution rate=0.05
h−1) was even higher at 70% (w/w). The volumetric productivity under batch and continuous mode of operation were 0.312 g L−1 h−1 and 0.718 g L−1 h−1 respectively. Continuous fermentation with cell retention demonstrated even higher volumetric productivities at 0.98 g L−1 h−1 with out clogging problems It could be used for utilization of cheese whey to produce propionic acid at higher yield and
productivities. 相似文献
18.
Jie Chen Heming Chen Xiangchen Zhu Yinghua Lu Shang-Tian Yang Zhinan Xu Peilin Cen 《Applied microbiology and biotechnology》2009,82(2):241-248
The production of recombinant glycoproteins in Dictyostelium discoideum by conventional cell culture methods was limited by low cell density as well as low growth rate. In this work, cotton towel
with a good adsorption capability for D. discoideum cells was used as the immobilization matrix in an external fibrous bed bioreactor (FBB) system. With batch cultures in the
FBB, the concentration of immobilized cells in the cotton fiber carrier increased to 1.37 × 108 cells per milliliter after 110-h cultivation, which was about tenfold higher than the maximal cell density in the conventional
free-cell culture. Correspondingly, a high concentration of soluble human Fas ligand (hFasL; 173.7 μg l−1) was achieved with a high productivity (23 μg l−1 h−1). The FBB system also maintained a high density of viable cells for hFasL production during repeated-batch cultures, achieving
a productivity of 9∼10 μg l−1 h−1 in all three batches studied during 15 days. The repeated-batch culture using immobilized cells of D. discoideum in the FBB system thus provides a good method for long-term and high-level production of hFasL. 相似文献
19.
Metabolic engineering of Mannheimia succiniciproducens for succinic acid production based on elementary mode analysis with clustering
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Mannheimia succiniciproducens, a capnophilic gram‐negative rumen bacterium, has been employed for the efficient production of succinic acid. Although M. succiniciproducens metabolism was previously studied using a genome‐scale metabolic model, more metabolic characteristics are to be understood. To this end, elementary mode analysis accompanied with clustering (‘EMC’ analysis) is used to gain further insights on metabolic characteristics of M. succiniciproducens allowing efficient succinic acid production. Elementary modes (EMs) generated from the central carbon metabolic network of M. succiniciproducens are clustered to systematically analyze succinic acid production routes. Based on the results of EMC analysis, zwf gene is identified as a novel overexpression target for the improved succinic acid production. This gene is overexpressed in a previously constructed succinic acid‐overproducing M. succiniciproducens LPK7 strain. Heterologous NADPH‐dependent mdh is later intuitively selected for overexpression to synergistically improve succinic acid production by utilizing abundant NADPH pool mediated by the overexpressed zwf. The LPK7 strains co‐expressing mdh alone and both zwf and mdh genes are subjected to fed‐batch fermentation to better examine their succinic acid production performances. Strategies of EMC analysis will be useful for further metabolic engineering of M. succiniciproducens and other microorganisms to improve production of succinic acid and other chemicals of interest. 相似文献
20.
Sirisansaneeyakul S Luangpipat T Vanichsriratana W Srinophakun T Chen HH Chisti Y 《Journal of industrial microbiology & biotechnology》2007,34(5):381-391
Production of lactic acid from glucose by immobilized cells of Lactococcus lactis IO-1 was investigated using cells that had been immobilized by either entrapment in beads of alginate or encapsulation in
microcapsules of alginate membrane. The fermentation process was optimized in shake flasks using the Taguchi method and then
further assessed in a production bioreactor. The bioreactor consisted of a packed bed of immobilized cells and its operation
involved recycling of the broth through the bed. Both batch and continuous modes of operation of the reactor were investigated.
Microencapsulation proved to be the better method of immobilization. For microencapsulated cells at immobilized cell concentration
of 5.3 g l−1, the optimal production medium had the following initial concentrations of nutrients (g l−1): glucose 45, yeast extract 10, beef extract 10, peptone 7.5 and calcium chloride 10 at an initial pH of 6.85. Under these
conditions, at 37 °C, the volumetric productivity of lactic acid in shake flasks was 1.8 g l−1 h−1. Use of a packed bed of encapsulated cells with recycle of the broth through the bed, increased the volumetric productivity
to 4.5 g l−1 h−1. The packed bed could be used in repeated batch runs to produce lactic acid. 相似文献