Relevant bibliographies by topics / Acidi succinici

Academic literature on the topic 'Acidi succinici'

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Published: 11 March 2023

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Journal articles on the topic "Acidi succinici"

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Jung, Yui Jung. "The Influence of Organic Acid on Color Retention after Dyeing - Focusing on succinic acid and tartaric acid." Journal of Health and Beauty 16, no. 2 (August 31, 2022): 163–72. http://dx.doi.org/10.35131/ishb.2022.16.2.163.

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Levchyck, N. Ya. "BIOLOGICAL ACTIVITY OF SUCCINIC ACIDS." Biotechnologia Acta 10, no. 6 (December 2017): 53–60. http://dx.doi.org/10.15407/biotech10.06.053.

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Lee, Jae Young, and Lynn M. Hildemann. "Comparisons between Hygroscopic Measurements and UNIFAC Model Predictions for Dicarboxylic Organic Aerosol Mixtures." Advances in Meteorology 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/897170.

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Hygroscopic behavior was measured at 12°C over aqueous bulk solutions containing dicarboxylic acids, using a Baratron pressure transducer. Our experimental measurements of water activity for malonic acid solutions (0–10 mol/kg water) and glutaric acid solutions (0–5 mol/kg water) agreed to within 0.6% and 0.8% of the predictions using Peng’s modified UNIFAC model, respectively (except for the 10 mol/kg water value, which differed by 2%). However, for solutions containing mixtures of malonic/glutaric acids, malonic/succinic acids, and glutaric/succinic acids, the disagreements between the measurements and predictions using the ZSR model or Peng’s modified UNIFAC model are higher than those for the single-component cases. Measurements of the overall water vapor pressure for 50 : 50 molar mixtures of malonic/glutaric acids closely followed that for malonic acid alone. For mixtures of malonic/succinic acids and glutaric/succinic acids, the influence of a constant concentration of succinic acid on water uptake became more significant as the concentration of malonic acid or glutaric acid was increased.
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Kang, In-Sook, and Hyun-Sook Bae. "Mechanical Properties of Cotton Fabric Treated with Succinic Acid - Tear Strength -." Textile Coloration and Finishing 21, no. 3 (June 27, 2009): 1–9. http://dx.doi.org/10.5764/tcf.2009.21.3.001.

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Dey, Swapan, Dibyendu Sain, Ashish Kumar, and Chanda Kumari. "A series of ditopic receptors for succinic acid binding." RSC Adv. 4, no. 93 (2014): 51486–95. http://dx.doi.org/10.1039/c4ra07537d.

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Three ditopic-abiotic receptors (R1, R2 and R3) have been designed and synthesised. The receptors have been applied for the recognition of dicarboxylic acids viz. malonic, succinic, glutaric and adipic acids. Among them, succinic acid shows the highest binding efficiency to all receptors. Recognition of succinic acid is very important due to its various adverse effects on human health upon prolonged exposure.
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Kvaratskhelia, E., and R. Kurtanidze. "THE ELECTROLYTIC DISSOCIATION OF METHYLENE SUCCINIC ACID." Chemical Problems 17, no. 3 (2019): 408–12. http://dx.doi.org/10.32737/2221-8688-2019-3-408-412.

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Lee, Sang Jun, Hyohak Song, and Sang Yup Lee. "Genome-Based Metabolic Engineering of Mannheimia succiniciproducens for Succinic Acid Production." Applied and Environmental Microbiology 72, no. 3 (March 2006): 1939–48. http://dx.doi.org/10.1128/aem.72.3.1939-1948.2006.

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ABSTRACT Succinic acid is a four-carbon dicarboxylic acid produced as one of the fermentation products of anaerobic metabolism. Based on the complete genome sequence of a capnophilic succinic acid-producing rumen bacterium, Mannheimia succiniciproducens, gene knockout studies were carried out to understand its anaerobic fermentative metabolism and consequently to develop a metabolically engineered strain capable of producing succinic acid without by-product formation. Among three different CO2-fixing metabolic reactions catalyzed by phosphoenolpyruvate (PEP) carboxykinase, PEP carboxylase, and malic enzyme, PEP carboxykinase was the most important for the anaerobic growth of M. succiniciproducens and succinic acid production. Oxaloacetate formed by carboxylation of PEP was found to be converted to succinic acid by three sequential reactions catalyzed by malate dehydrogenase, fumarase, and fumarate reductase. Major metabolic pathways leading to by-product formation were successfully removed by disrupting the ldhA, pflB, pta, and ackA genes. This metabolically engineered LPK7 strain was able to produce 13.4 g/liter of succinic acid from 20 g/liter glucose with little or no formation of acetic, formic, and lactic acids, resulting in a succinic acid yield of 0.97 mol succinic acid per mol glucose. Fed-batch culture of M. succiniciproducens LPK7 with intermittent glucose feeding allowed the production of 52.4 g/liter of succinic acid, with a succinic acid yield of 1.16 mol succinic acid per mol glucose and a succinic acid productivity of 1.8 g/liter/h, which should be useful for industrial production of succinic acid.
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N, Hema, and K. P. Sreenath. "Screening for Isolation of Succinic Acid Producing Microbes." Biosciences, Biotechnology Research Asia 15, no. 2 (June 7, 2018): 327–33. http://dx.doi.org/10.13005/bbra/2636.

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Succinic acid has emerged as one of the most competitive bio-based chemicals. Present study intended to isolate potential strains for the production of succinic acid. More than 90 isolates were obtained from various sources using anaerobic techniques. All the strains were screened for succinic acid production through bromocresol green media, thin layer chromatography and HPLC methods. 74 isolates showed colour change in bromocresol green media indicating the production of organic acids, of which 14 isolates showed succinic acid production determined by thin layer chromatography which were quantified through HPLC. The isolates which yielded succinic acid ranged from 0.24g/l (MGC) to 4.69g/l (RFC-P3).
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Mello, Karine Gargioni Pereira Correa de, Leandra de Cássia Bernusso, Ronaldo Nogueira de Moraes Pitombo, and Bronislaw Polakiewicz. "Synthesis and physicochemical characterization of chemically modified chitosan by succinic anhydride." Brazilian Archives of Biology and Technology 49, no. 4 (July 2006): 665–68. http://dx.doi.org/10.1590/s1516-89132006000500017.

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The N-succinil-chitosan is a chemically modified derivative of the biopolymer chitosan. The succinic anhydride attached to the free amino groups presented along the chitosan's polymer chain imparts to the molecule different physicochemical properties not exhibited before the modification. These chemical modifications enhance chitosan's solubility in slightly acid, neutral and alkaline media. These properties are related to the long alkyl chains attached to hydrophilic parts. In this case the hydrophilic part of D-glucosamine promotes stronger interactions with the water molecules, and consequently, enhances the solubility of the chitosan polymer. Non-modified free chitosan is soluble only in acidic medium (pH < 5.5). These modifications made possible new applications of chitosan in biotechnological area since the solubility in neutral or slightly alkaline solutions is very important in a biological field.
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OH, MYEONGGEUN, JOONGJAE LEE, YOONHWA JEONG, and MISOOK KIM. "Synergistic Antilisterial Effects of Mixtures of Lysozyme and Organic Acids." Journal of Food Protection 79, no. 12 (December 1, 2016): 2184–89. http://dx.doi.org/10.4315/0362-028x.jfp-16-156.

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ABSTRACT We investigated the synergistic effects of lysozyme combined with organic acids to inhibit the growth of Listeria monocytogenes. The antilisterial effects of the combination of lysozyme and acetic acid, citric acid, lactic acid, malic acid, or succinic acid were evaluated using the checkerboard method and time-kill assay. The MIC was 25,000 mg/liter for lysozyme, 625 mg/liter for acetic acid, and 1,250 mg/liter for the other acids. The MBC was 10,000 mg/liter for all of the tested organic acids. The combination of lysozyme and each organic acid showed synergistic effects via the checkerboard method; however, the time-kill assay showed synergistic effects for only three combinations of 1,250 mg/liter lysozyme with succinic acid (312 and 625 mg/liter) or malic acid (625 mg/liter). The results of this study indicate that the combination of lysozyme and malic acid or succinic acid can be effectively used as a food preservative to control L. monocytogenes.
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Dissertations / Theses on the topic "Acidi succinici"

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Venneri, Cesare Daniele. "Sintesi stereoselettiva mediata da enzimi di analoghi lineari e ciclici dell'acido Ÿ- amminobutirrico." Doctoral thesis, Università degli studi di Trieste, 2010. http://hdl.handle.net/10077/3517.

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2008/2009
E’ stata sviluppata una sintesi enantioselettiva facile e rapida di una serie di analoghi del GABA beta-sostituiti e beta,beta’-disostituiti potenzialmente utili, a partire da precursori gamma-nitro esterei racemi facilmente disponibili, attraverso la loro risoluzione cinetica enzimatica. L'applicazione della procedura descritta al substrato che reca in posizione beta il raggruppamento isobutilico consente di ottenere il composto terapeuticamente utile (S)-(+)-Pregabalina e la sua controparte enantiomerica; la medesima strategia sintetica applicata al substrato beta,beta’-disostituito con i gruppi metile e isobutile conduce all’analogo tetrasostituito della stessa Pregabalina, mentre il substrato recante in beta,beta’ il gruppo 3-metilcicloesile permette l’ottenimento di un analogo chirale della Gabapentina (Neurontin®) e del suo enantiomero. L’interesse verso la sintesi di gamma-amminoacidi beta,beta’-sostituiti risiede non solo nella potenziale attività biologica dei composti target, analoghi chirali della Gabapentina, ma è anche in relazione al problema sintetico connesso con l’ottenimento di composti chirali in cui l’atomo di carbonio asimmetrico è quaternario. I risultati ottenuti sono di notevole interesse anche alla luce della nota riluttanza delle comuni idrolasi a riconoscere e trasformare substrati in cui il centro chirale adiacente alla funzione idrolizzabile è completamente sostituito. La medesima procedura rappresenta inoltre una strategia sintetica alternativa per acidi 2-alchilsuccinici otticamente attivi, che possono essere così ottenuti in condizioni relativamente blande. Infatti la trasformazione di un nitrocomposto primario in un acido carbossilico, nota come reazione di Victor Meyer, richiede condizioni drastiche, cioè trattamento a riflusso con acidi minerali, oppure laboriose procedure di sintesi. Gli acidi succinici, oltre a manifestare varie attività a livello biologico, sono utili intermedi sintetici per importanti building blocks omochirali come beta-lattami, beta- e gamma-lattoni, succinimidi, anidridi succiniche. Nell’ambito della sintesi degli analoghi del GABA beta,beta’-sostituiti, inoltre, parallelamente al lavoro con gli enzimi è stata sviluppata un’addizione coniugata diretta e altamente enantioselettiva di un nitroalcano ad un’aldeide alfa,beta-insatura usando difenilprolinol silil etere come organocatalizzatore, per ottenere un intermedio prontamente convertito nell’amminoacido target. Questa concisa, pratica ed efficiente procedura sintetica si ritiene possa trovare ampia applicabilità nella sintesi stereoselettiva di altri composti recanti un carbonio quaternario chirale, di difficile ottenimento, e, in particolare, di altri gamma-amminoacidi beta,beta-dialchilati enantiopuri di interesse chimico e farmaceutico. Si presenta infine un’efficiente sintesi dell’acido 2-carbossi-3-pirrolidinacetico, gamma-amminoacido conformazionalmente costretto e importante agonista del recettore NMDA (N-metil-D-aspartato) che costituisce lo scheletro degli acidi kainici, dotati, fra le varie azioni biologiche, di attività neuroeccitatoria. La strategia sintetica proposta conduce ad elevati eccessi enantiomerici e rese soddisfacenti.
XXII Ciclo
1981
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2

De, Klerk Jean-Louis. "Succinic acid production by wine yeasts." Thesis, Stellenbosch : University of Stellenbosch, 2010. http://hdl.handle.net/10019.1/4228.

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Thesis (MScAgric (Viticulture and Oenology))--University of Stellenbosch, 2010.
ENGLISH ABSTRACT: One of the most striking qualities of wine is its tart, sour taste. The sensory perception of sourness is mainly attributed to the presence of hydrogen ions (protons) at high concentrations. Large amounts of weak carboxylic acids (organic acids) are the main sources of these ions within wine. Once wine enters a person's mouth, the dissociable protons of the weak organic acids within wine are partially neutralized or, in other words, titrated by the saliva secreted inside one's mouth. This explains why the duration and intensity of a wine's sourness is related to its titratable acidity content. The sour taste of wine is usually considered refreshing and it helps balance wine flavour. In fact, wines become watery when its titratable acidity content is too low. After alcoholic fermentation, the titratable acidity of wine will usually be less than that of the grape juice from which was made due to ethanol-induced precipitation of potassium bitartrate crystals and partial consumption of malic acid by fermenting wine yeasts. Occasionally however, increases in titratable acidity are observed during alcoholic fermentation. If wine is produced from grape juice with optimum levels of titratable acidity, unforeseen increases in titratable acidity during alcoholic fermentation can be detrimental to the quality of the final product. Although the net production of malic acid by wine yeasts contributes to increases in titratable acidity seen during grape juice fermentations, the production of succinic acid is regarded as the primary contributor. In fact, succinic acid accounts for approximately 90% of the non-volatile acids produced during fermentation of grape juice. Between 0.5 and 1.5 g/L succinic acid is normally found in wine, but higher concentrations thereof (up to 3.0 g/L) have been detected within certain red wines. Acidity adjustments should preferably be carried out before the onset of alcoholic fermentation to allow better integration of the added compound(s) and to ensure that conditions during fermentation favour the quality and microbial stability of the final product. In doing so unfortunately, winemakers run the risk of ending up with wines that may taste too sour if they are unable to accurately predict and take into consideration the amount of succinic acid produced during alcoholic fermentation. Knowledge with regard to the factors involved in succinic acid's production by fermenting wine yeasts is therefore required in order to manage the titratable acidity of wines more accurately. Ever since Louis Pasteur first noticed succinic acid amongst the by-products of alcoholic fermentation, attempts have been made to determine the metabolic pathways and factors involved in its production by fermenting wine yeasts. Up until now however, it remains unclear why wines sometimes end up with exceptionally high levels of succinic acid. For these reasons it was decided to investigate the possible causes of very high succinic acid concentrations within wine. Due to complexity of grape juice's chemical composition and the problems associated with sterilizing grape juice, fermentation experiments were conducted within a chemically defined grape juice-like medium. Succinic acid production by nine different industrial wine yeast strains was studied under various conditions with regard to the nutrient status of the synthetic grape juice, temperature and availability of molecular oxygen during alcoholic fermentation. The amount of succinic acid produced during alcoholic fermentation was found to depend on the yeast strain, fermentation temperature and chemical composition of the synthetic grape juice. Out of the nine commercial yeast strains selected for this study, strain WE372 produced the largest amount of succinic acid in synthetic grape juice at 28°C. Strain WE372 produced significantly smaller amounts of acetic acid than the other yeast strains of this study and very little acetic acid at 28°C, which indicated that strain WE372 may have less acetaldehyde dehydroganase activity than the other yeast strains of this study under the conditions tested. The effect this has on NAD: NADH balance is the probable cause for its ability to form more glycerol, succinic and malic acid than the other strains. Results from our study show that succinic acid production is influenced primarily by the metabolizable fraction of YAN, which we termed metabolically available nitrogen (MAN). Succinic acid production by fermenting yeasts will be favoured by moderate to high fermentation temperatures (20°C to 28°C) in grape juice with a nicotinic acid and/ or nicotinamide deficiency, high sugar content (200 g/L to 240 g/L), moderate amounts of metabolically available nitrogen (300 ± 50 mg/L MAN), the presence of flavonoids and large supplies of unsaturated long-chain fatty acids. Even higher concentrations of succinic acid were produced when oxygen was made available to fermenting yeasts by aerating the fermenting grape juice. Fermentation temperatures below 18°C, too much metabolizable nitrogen (> 450 mg/L MAN), very high concentrations of fermentable sugar (> 240 g/L), lipid deficiencies and a lack of pantothenic acid, thiamine, biotin or pyridoxine will decrease the amount of succinic acid produced fermenting yeasts.
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3

Andersson, Christian. "Succinic acid production using metabolically engineered Escherichia coli." Licentiate thesis, Luleå : Luleå University of Technology, 2007. http://epubl.ltu.se/1402-1757/2007/12/.

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Brown, Samantha Jayne. "Novel fluorinated succinic acid derivatives from HCFC-133a." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396808.

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Maharaj, Karishma. "Continuous succinic acid fermentation using immobilised Actinobacillus succinogenes." Diss., University of Pretoria, 2013. http://hdl.handle.net/2263/40818.

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Actinobacillus succinogenes cells were grown on Poraver® support particles in a packed-bed reactor. Dilution rates (D) of 0.054–0.72 h-1 were investigated. Glucose was used as substrate. CO2 (g) was bubbled into a complex medium to satisfy the fixation requirements and maintain anaerobic conditions. At D ≥ 0.31 h-1, an initial glucose concentration of 35 g.L-1 was used; at lower dilution rates, this was increased to 60 g.L-1 in order to avoid substrate limitations. By-product formation included acetic and formic acids. A maximum productivity of 10.7 g.L-1 was obtained at D = 0.7 h-1. It was found that the system provided repeatable results at a given D. The longest steady state period was maintained for about 97 h at D = 0.31 h-1. Steady state stability was maintained for > 72 h at D < 0.31 h-1. For periods longer than 75 h, however, inhibitory acid titres resulted in a gradual decline in productivity. At higher dilution rates, long-term stability could not be maintained. The low acid titres produced significant biofilm sloughing following aggressive biofilm growth, resulting in oscillatory system behaviour. For fermentation times < 115 h, the dilution rate was secondary to the attachment area in determining the total biomass at steady state. Total biomass values were then used to determine specific rates. A clear trend was observed, with the specific glucose consumption rate, and specific acid production rates, increasing with increasing D. This was explained by assuming a maintenance-driven system at all Ds studied. A product analysis indicated that at ΔS < 15 g.L-1, pyruvate formate lyase was the preferred oxidative route. A shift to the pyruvate dehydrogenase pathway occurred at higher ΔS values, so that the highest YSS values obtained exceeded 0.85 g.g-1. A decrease in C3 by-product formation resulted in high YSS values being maintained, indicating an additional, unknown source of nicotinamide adenine dinucleotide (NADH). It is recommended that any process utilising immobilised A. succinogenes cells should operate at an intermediate D, in order to maintain long-term reactor stability, high productivities and good yields.
Dissertation (MEng)--University of Pretoria, 2013.
gm2014
Chemical Engineering
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Vlysidis, Anestis. "Sustainable biodiesel biorefineries for the green succinic acid production." Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/sustainable-biodiesel-biorefineries-for-the-green-succinic-acid-production(03cedd62-6e30-4719-b9ff-e6776583b733).html.

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There is a huge global challenge to establish alternative forms of energy in order to cope with the increasing worldwide energy demand, currently based on finite fossil fuel reserves. In the transportation sector, renewable liquid fuels, such as bio-ethanol and biodiesel which are made from biomass and are substitutes for the petroleum-derived gasoline and diesel, have received increasing interest. In spite of their recent development, the biofuel industries cannot compete with conventional liquid fuels because of their higher costs. Decisive changes are required to improve their economic sustainability, such as the establishment of novel processes that utilize their by-products for the production of value-added chemicals. In this study, the bioconversion of glycerol, which is the main by-product of the biodiesel industry, to succinic acid by using the bacterium Actinobacillus succinogenes has been investigated both experimentally and computationally. Initially, the cells were adapted to accept a glycerol rich environment by performing a series of experiments. Cells from the best experiment from each run were used as inocula for the next experiment. Batch fermentations were then performed in small scale anaerobic reactors (SARs) and in lab-scale bench top reactors (B-TRs) by using the new ‘adapted’ strain. The maximum succinic acid yield, productivity and final concentration obtained from this bioprocess were found to be 1.29 g/g, 0.27 g/L/h and 29.3 g/L, respectively. Moreover, cells have also grown successfully in both synthetic and biodiesel-derived crude glycerol, indicating that it is not necessary to remove the impurities that biodiesel-derived glycerol contains. Subsequently, an unstructured model that accounts for substrate and product inhibition was developed in order to predict the behaviour of experiments starting from different initial conditions. Model predictions were found to be in good agreement with experimental data obtained for both systems (SARs and B-TRs). Batch and fed-batch systems were optimized using the developed model to obtain high succinic acid productivity. Optimization results showed that productivity increased by 31% for batch and 79% for fed-batch systems. The corresponding optimal values were computed to be equal to 0.356 g/L/h for batch and 0.488 g/L/h for fed-batch systems. A semi-mechanistic model for the fungal fermentation on solid state rapeseed meal (i.e. the other main by-product of the biodiesel industry) was also constructed for small scale tray bioreactors. This fermentation targets to increase the nutrient factor of the rapeseed meal by decomposing its macromolecules to simple compounds which can then be used as a generic medium. The developed model effectively predicts the fungal growth, the temperature fluctuations and the moisture content inside the bed and the produced extracellular enzymes that break the complex compounds of rapeseed meal (i.e. proteins) to free amino acids. The economic sustainability of biodiesel production was investigated by the construction of a plant model of an integrated biodiesel biorefinery for the production of fuels (biodiesel) and chemicals (succinic acid) in Aspen Plus®. For a biodiesel plant with capacity of 7.8 ktons per year, it was found that the plant’s profitability can be increased by 60% (considering a 20 years plant life and an interest rate of 7%) if a fermentation and recovery process for producing succinic acid is added. The integrated biorefinery scheme demonstrated the highest profits (€ 9.95 M.) when compared with other scenarios which either purified or disposed of the glycerol. These results illustrate the critical role of glycerol when it is utilized as a key renewable building block for the production of commodity chemicals. It is clear, based on this work, that future studies targeting the sustainable development of biodiesel biorefineries should focus their investigation on novel bio-processes, like the succinic acid fermentation, supplementing the production of fuels with the co-production of platform chemicals.
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Mokwatlo, Sekgetho Charles. "Analysis of succinic acid-producing biofilms of Actinobacillus succinogenes." Diss., University of Pretoria, 2020. http://hdl.handle.net/2263/76114.

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Biofilms of the bovine rumen bacterium Actinobacillus succinogenes have demonstrated their exceptional capabilities as biocatalysts for high productivity, titre and yield production of succinic acid (SA). Succinic acid is set to become a significant building block chemical in the biobased economy. Although substantial progress has been made towards understanding the productive aspect of this microorganism with regard to its metabolic limits and performance on unrefined biorefinery stream substrates, more research is still required to address other challenges. One aspect is to understand how the biofilm biocatalyst is affected by bioreactor conditions, which would help in developing stable and highly active biofilms. For this reason the aim of this thesis was (i) to characterise how the accumulation of acid metabolites in continuous operation impacts A. succinogenes biofilms with respect to biofilm development, biofilm structure and cell activity within the biofilm, (ii) to show how shear conditions in the fermenter can be used to manipulate the biofilm structure and viable cell content of biofilms, leading to improved cell-based succinic acid productivities, and lastly (iii) to investigate the internal mass transfer effects on biofilm performance, further showing the role played by differences in shear and acid accumulation conditions in this respect. The first part of the study addressed the interaction between the biofilm and the accumulation of metabolites produced. The results showed that biofilms of A. succinogenes develop rapidly and with high activity when cultivated under low product accumulation (LPA) conditions (< 10 g L-1 SA). High product accumulation (HPA) conditions considerably slowed down biofilm development, and increased cell mortality. Under HPA conditions some cells exhibited severe elongation while maintaining a cross-sectional diameter like the rod/cocci-shaped cells predominantly found in LPA conditions. The elongated cells formed in HPA conditions were found to be more viable and thus more resistant than the clusters of rod-shaped or cocci-shaped cells. The global microscopic structure of the HPA biofilms also differed significantly from that of the LPA biofilms. Although both exhibited shedding after 4 days of growth, the LPA biofilms were more homogenous (less patchy), thicker and had high viability throughout the biofilm depth. In the second part of the study, two custom-designed bioreactors were used to evaluate the effect of shear on the biofilms. The first bioreactor allowed for in situ removal of small biofilm samples used for microscopic imaging. The second bioreactor allowed for complete removal of all biofilm and was used to analyse biofilm composition and productivity. Results clearly indicated that high shear biofilm cultivation in LPA conditions has beneficial morphological, viability and cell-based productivity characteristics. The smooth, low-porosity biofilms obtained under high shear and LPA conditions had an average cell viability of 79% (over a 3-day cultivation period) compared with the low shear value of 57%, also developed under LPA conditions. The EPS content of the high shear biofilm was 58% compared with 7% of the low shear equivalent. The cell-based (EPS excluded) succinic acid productivity for the high shear biofilm was 2.4 g g-1DCW h-1 compared with the 0.8 g g-1DCW h-1 for the low shear biofilm. This threefold increase in productivity obtained from the second bioreactor corresponded to the cell viability differences obtained from the first bioreactor. Clear evidence was provided for shear-induced shaping of the biofilm which resulted in improved volumetric glucose turnover attributes within the biofilm matrix. The last section of the study investigated internal mass transfer effects in biofilm fermentations of Actinobacillus succinogenes by performing batch fermentations using attached and resuspended biofilms as biocatalysts. In the latter, the biofilms were resuspended after initial development to simulate mass transfer-free fermentations. Intrinsic kinetics for succinic acid production obtained from resuspended fermentations predicted faster production rates than for the attached biofilm runs (biofilm thicknesses in the range of 120–200 µm), indicating internal mass transfer limitations. A developed biofilm reaction diffusion model gave good prediction of attached biofilm batch operation results by accounting for internal mass transfer in the biofilm. Biofilm effectiveness factors ranged from 75% to 97% for all batches at the inception of batch conditions, but increased with the progression of batch operation due to the increased succinic acid titres which inhibited the production rates. Analysis of pseudo-steady-state continuous fermentation data from the literature, as well as from the second part of the study, using the model developed, showed that active biofilm thickness and effectiveness factors were dependent on the shear conditions and succinic acid titres in the biofilm reactors. A simplified algorithm was developed to estimate the pseudo-steady-state glucose penetration and biofilm effectiveness of A. succinogenes biofilms without the requirement to solve the overall mass transfer model. The results clearly showed that internal mass transfer needs to be considered in biofilm fermentations involving A. succinogenes as high biomass concentrations may not always equate to increased productivities if mass transfer effects dominate.
Thesis (PhD)--University of Pretoria, 2020.
NRF
Chemical Engineering
PhD
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8

Andersson, Christian. "Biobased production of succinic acid by Escherichia coli fermentation /." Luleå : Luleå University of Technology, 2009. http://pure.ltu.se/ws/fbspretrieve/2578562.

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Abou, Hamdan Marwa. "Hydrogenation of succinic acid and carbon dioxide over molybdenum carbide catalysts." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSE1065.

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Ce travail de thèse porte sur la synthèse de carbures de molybdène sur support afin de tester leurs performances catalytiques dans des réactions d’hydrogénation. Dans ce but, la conversion d'acide succinique en phase aqueuse dans un réacteur discontinu et du dioxyde de carbone en phase gazeuse dans un réacteur à flux continu, ont été effectuées. Les catalyseurs ont été préparés par la méthode de carburation par réduction en température programmée, pendant laquelle des paramètres ont été modifiés conduisant à différents rapports molybdène/carbone. Les différents catalyseurs testés dans cette réaction étaient actifs pour la conversion de l'acide succinique en gamma-butyrolctone et, plus remarquablement, en acide butyrique, ce dernier n'était pas obtenu en quantités significatives avec des catalyseurs à base de métaux précieux. L’augmentation de la conversion d’acide succinique avec une sélectivité plus élevée en acide butyrique a été faite avec les catalyseurs contenant plus de carbone, préparés en augmentant la vitesse spatiale horaire gazeuse. Les intermédiaires ont été ensuite convertis en tétrahydrofurane, butanol, 1,4-butanediol et butane. La désactivation observée lors de recyclage du catalyseur a été principalement attribuée à une diminution de la quantité de molybdène et de carbone carbidique, démontrée par l'analyse XPS. Des essais préliminaires de ces catalyseurs dans l'hydrogénation du dioxyde de carbone ont montré qu'ils fonctionnaient principalement en tant que catalyseurs pour la réaction du gaz à l’eau inverse, et l'excès de carbone entrave l'activité catalytique d'une manière opposée à la réaction en phase aqueuse. Le support semble jouer un rôle dans la réactivité des catalyseurs, la conversion du dioxyde de carbone ainsi que la sélectivité en méthane et méthanol, qui ont augmenté dans l'ordre suivant: carbure de molybdène sur support DT51 TiO2> P25 TiO2 ˜ ZrO2
This work focuses on the synthesis of supported molybdenum carbides and evaluating their catalytic performance in succinic acid hydrogenation reactions in aqueous phase using batch reactor and carbon dioxide hydrogenation in gas phase using continuous flow reactor. The catalysts were prepared by the temperature programmed reduction carburization method, where the parameters were modified leading to different molybdenum to carbon ratios. The different catalysts tested were active in converting succinic acid to gamma butyrolctone and more remarkably butyric acid which is not reported in significant quantities in this reaction with precious metal based catalysts. The catalysts containing more carbon contents that were prepared by increasing the gas hourly space velocity showed higher activity in converting succinic acid and higher selectivity to butyric acid. The intermediates were then converted to tetrahydrofuran, butanol, 1,4-butanediol and butane gas. The deactivation observed while recycling the catalyst was mainly attributed to a decrease in the amounts of carbidic molybdenum and carbidic carbon, as demonstrated by XPS analysis. Preliminary tests for these catalysts in carbon dioxide hydrogenation showed that they functioned mainly as reverse water gas shift catalysts, and the excess of carbon hinders the catalytic activity in an opposite manner of the reaction in aqueous phase. The support seems playing a role in the reactivity of the catalysts, carbon dioxide conversion as well as methane and methanol selectivity increased in the order: molybdenum carbide supported on DT51 TiO2 > P25 TiO2 ˜ ZrO2
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Lo, Enlin. "Sustainable Production of Bio-based Succinic Acid from Plant Biomass." Scholar Commons, 2018. https://scholarcommons.usf.edu/etd/7693.

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Succinic acid is a compound used for manufacturing lacquers, resins, and other coating chemicals. It is also used in the food and beverage industry as a flavor additive. It is predominantly manufactured from petrochemicals, but it can also be produced more sustainably by fermentation of sugars from renewable feedstocks (biomass). Bio-based succinic acid has excellent potential for becoming a platform chemical (building block) for commodity and high-value chemicals. In this study, we focused on the production of bio-based succinic acid from the fiber of sweet sorghum (SS), which has a high fermentable sugar content and can be cultivated in a variety of climates and locations around the world. To avoid competition with food feedstocks, we targeted the non-edible ‘bagasse’, which is the fiber part after extracting the juice. Initially, we studied various conditions of pretreating SS bagasse to remove most of the non-fermentable portions and expose the cellulose fibers containing the fermentable sugars (glucose). Concentrated (83%) phosphoric acid was utilized at mild temperatures of 50-80 °C for 30-60 minutes at various bagasse loadings (10-15%) using a partial factorial experimental design. After pretreatment, the biomass was subjected to enzymatic hydrolysis with commercial cellulase enzyme (Cellic® Ctec2) to identify the pretreatment conditions that lead to the highest glucose yield that is critical for the production of succinic acid via fermentation with the bacterium Actinobacillus succinogenes. As the pretreatment temperature and duration increased, the bagasse color changed from light brown to dark brown-black, indicating decomposition, which ranged from 15% to 72%. The pretreatment results were fitted with an empirical model that identified 50 °C for 43 min at 13% solids loading as optimal pretreatment conditions that lead to the highest glucose release from sweet sorghum bagasse. Biomass pretreated at those conditions and subjected to separate enzymatic hydrolysis and fermentation with A. succinogenes yielded almost 18 g/L succinic acid, which represented 90% of the theoretical yield, a very promising performance that warranties further investigation of bio-based succinic acid production from sweet sorghum bagasse, as a more sustainable alternative to succinic acid produced from fossil sources, such as oil.
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Books on the topic "Acidi succinici"

1

Aminov, S. N. Poverkhnostno-aktivnye proizvodnye alkileni͡a︡ntarnykh kislot. Tashkent: Izd-vo "Fan" Uzbekskoĭ SSR, 1986.

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Gibson, K. Michael, Cornelis Jakobs, and Philip L. Pearl. Succinic Semialdehyde Dehydrogenase Deficiency. Oxford University Press, 2016. http://dx.doi.org/10.1093/med/9780199972135.003.0029.

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Succinic semialdehyde dehydrogenase (SSADH) deficiency presents with intellectual disability, disproportionate deficit in expressive language, hypotonia, ataxia, and seizures.1,2 (1 Pearl et al 2011; 2 Vogel et al 2012). A diagnosis of autism spectrum disorder frequently occurs, correlated with neuropsychiatric morbidity (ADHD, OCD, PDD). 1,3 The biochemical hallmark, γ‎-hydroxybutyric acid (GHB), is elevated in physiological fluids, as is γ‎-aminobutyrate (GABA) in cerebrospinal fluid (CSF).4,5 Both species are neuroactive. Clinical manifestations are universally present in early childhood, although diagnosis delayed to adulthood has been reported.6 Acute decompensation or complications relate primarily to seizures, intercurrent illnesses sometimes associated with respiratory dysfunction in the setting of hypotonia, or adverse medication responses. Diagnostic confirmation requires urine organic acid analysis (increased GHB) with confirmation via enzyme assay (white cells) and/or molecular characterization of the aldehyde dehydrogenase 5a1 (ALDH5A1) gene.
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Kaul, Arvind. Remediation of heavy-metal contaminated soils using succinic acid. 1992.

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Kaul, Arvind. Remediation of heavy-metal contaminated soils using succinic acid. 1992.

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Kirk-Othmer. Kirk-Othmer Encyclopedia of Chemical Technology, Silicon Compounds to Succinic Acid and Succinic Anhydride (Encyclopedia of Chemical Technology). 4th ed. Wiley-Interscience, 1997.

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Pearl, Phillip L., and William P. Welch. Pediatric Neurotransmitter Disorders. Oxford University Press, 2017. http://dx.doi.org/10.1093/med/9780199937837.003.0059.

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The pediatric neurotransmitter disorders represent an enlarging group of neurological syndromes characterized by inherited abnormalities of neurotransmitter synthesis, metabolism, and transport. Disorders involving monoamine synthesis include guanosine triphosphate cyclohydrolase deficiency (Segawa disease or classical Dopa-responsive dystonia as the heterozygous form), aromatic amino acid decarboxylase deficiency, tyrosine hydrolase deficiency, sepiapterin reductase deficiency, and disorders of tetrahydrobiopterin synthesis. These disorders can be classified according to whether they feature elevated serum levels of phenylalanine. Disorders of γ-amino butyric acid (GABA) metabolism include succinic semialdehyde dehydrogenase deficiency and GABA-transaminase deficiency. Glycine encephalopathy is typically manifested by refractory neonatal seizures due to a defect in the glycine degradative pathway. Pyridoxine-responsive seizures have now been associated with deficiency of α-aminoadipic semialdehyde dehydrogenase as well as a variants requiring therapy with pyridoxal-5-phosphate and folinic acid.
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Book chapters on the topic "Acidi succinici"

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Cleaves, Henderson James. "Succinic Acid." In Encyclopedia of Astrobiology, 1614–15. Berlin, Heidelberg: Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-11274-4_1532.

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Bährle-Rapp, Marina. "Succinic Acid." In Springer Lexikon Kosmetik und Körperpflege, 537. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_10166.

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Gooch, Jan W. "Succinic Acid." In Encyclopedic Dictionary of Polymers, 710. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11373.

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Cleaves, Henderson James. "Succinic Acid." In Encyclopedia of Astrobiology, 2404. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-662-44185-5_1532.

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Ahn, Jung Ho, Yu-Sin Jang, and Sang Yup Lee. "Succinic Acid." In Industrial Biotechnology, 505–44. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527807833.ch17.

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Litsanov, Boris, Melanie Brocker, Marco Oldiges, and Michael Bott. "Succinic Acid." In Bioprocessing of Renewable Resources to Commodity Bioproducts, 435–72. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118845394.ch16.

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Cleaves, Henderson James. "Succinic Acid." In Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-27833-4_1532-3.

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Cleaves, Henderson James. "Succinic Acid." In Encyclopedia of Astrobiology, 1. Berlin, Heidelberg: Springer Berlin Heidelberg, 2022. http://dx.doi.org/10.1007/978-3-642-27833-4_1532-4.

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Carlson, Alfred, Bill Coggio, Kit Lau, Christopher Mercogliano, and Jim Millis. "Industrial Production of Succinic Acid." In Chemicals and Fuels from Bio-Based Building Blocks, 173–90. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2016. http://dx.doi.org/10.1002/9783527698202.ch7.

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Bährle-Rapp, Marina. "PPG-7/Succinic Acid Copolymer." In Springer Lexikon Kosmetik und Körperpflege, 451. Berlin, Heidelberg: Springer Berlin Heidelberg, 2007. http://dx.doi.org/10.1007/978-3-540-71095-0_8466.

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Conference papers on the topic "Acidi succinici"

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Başoǧlu, Adil, Davut Avci, and Yusuf Atalay. "A Theoretical Investigation of Succinic Acid." In SIXTH INTERNATIONAL CONFERENCE OF THE BALKAN PHYSICAL UNION. AIP, 2007. http://dx.doi.org/10.1063/1.2733297.

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Lazareva, I. V., L. N. Kharlamova, and L. N. Krikunova. "SUCCINIC ACID USE DIRECTIONS IN FERMENTATION INDUSTRY." In Current issues in the beverage industry. Author-online, 2019. http://dx.doi.org/10.21323/978-5-6043128-4-1-2019-3-143-146.

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Daowu Wang, Jinlong Zheng, Hong Liu, and Long Zhang. "Natural medicine echinocystic modified by acid succinic anhydride." In 2011 International Conference on Remote Sensing, Environment and Transportation Engineering (RSETE). IEEE, 2011. http://dx.doi.org/10.1109/rsete.2011.5965961.

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Izepchenko, U. A., I. V. Puhteeva, M. L. Levin, and N. V. Gerasimovich. "INFLUENCE OF SUCCINIC ACID DERIVATIVES ON LYMPHOCYTE MEMBRANES." In SAKHAROV READINGS 2021: ENVIRONMENTAL PROBLEMS OF THE XXI CENTURY. International Sakharov Environmental Institute, 2021. http://dx.doi.org/10.46646/sakh-2021-1-258-261.

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It was found that after the use of the preparation of succinic acid, a decrease in the polarity of the lipid bilayer was noted, but in the region of the annular lipid, no significant differences were found between similar indicators. At the same time, a significant decrease in the microviscosity of the annular lipid was noted, and the microviscosity of the lipid bilayer increased 2.7 times compared with the control value.
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Dhivya, R., R. Ezhil Vizhi, and D. Rajan Babu. "Nucleation kinetics of urea succinic acid –ferroelectric single crystal." In NANOFORUM 2014. AIP Publishing LLC, 2015. http://dx.doi.org/10.1063/1.4918048.

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HONG, Y. K., Y. S. HUH, and W. H. HONG. "REMOVAL OF ACETIC ACID FROM AQUEOUS SOLUTIONS CONTAINING SUCCINIC ACID AND ACETIC ACID BY AMINE EXTRACTANTS." In Proceedings of the 4th International Conference. WORLD SCIENTIFIC, 2004. http://dx.doi.org/10.1142/9789812702623_0140.

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Zhao, Jinfang, Bowen Hua, Yongze Wang, Zao Liu, Jinhua Wang, and Shengde Zhou. "Fermentation characteristics of engineered Escherichia coli for succinic acid production." In 2013 International Conference on Materials for Renewable Energy and Environment (ICMREE). IEEE, 2013. http://dx.doi.org/10.1109/icmree.2013.6893836.

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Cardenas Almena, Maria Dolores, Octavio Lucio Esperilla, Francisco Martin Manzanero, Yolanda Murillo Duarte, Luis Carlos Quintero Toscano, and Guillermo Wolff. "Internal Diesel Injector Deposits: Sodium Carboxylates of C12 Succinic Acids and C16 and C18 Fatty Acids." In SAE 2012 International Powertrains, Fuels & Lubricants Meeting. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2012. http://dx.doi.org/10.4271/2012-01-1689.

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Manteghi, Faranak, and Hamidreza Panahi. "Succinic acid as a precursor for synthesis of nano cerium oxide." In The 17th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2013. http://dx.doi.org/10.3390/ecsoc-17-a025.

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Oqilov, B. R., M. S. Botalov, V. N. Rychkov, E. V. Kirillov, D. V. Smyshlyaev, A. S. Malyshev, A. O. Taukin, and A. R. Yuldashbaeva. "Study of scandium leaching from the red mud by succinic acid." In THE 2ND INTERNATIONAL CONFERENCE ON PHYSICAL INSTRUMENTATION AND ADVANCED MATERIALS 2019. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0032359.

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Reports on the topic "Acidi succinici"

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Shmorhun, Mark. BER-Myriant Succinic Acid Biorefinery. Office of Scientific and Technical Information (OSTI), December 2015. http://dx.doi.org/10.2172/1333678.

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Davison, B. H., and J. Nghiem. Production of Succinic Acid for Lignocellulosic Hydrolysates. Office of Scientific and Technical Information (OSTI), June 2002. http://dx.doi.org/10.2172/940388.

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MBI International. Succinic Acid as a Byproduct in a Corn-based Ethanol Biorefinery. Office of Scientific and Technical Information (OSTI), December 2007. http://dx.doi.org/10.2172/921598.

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Donal F. Day. Sugar-Based Ethanol Biorefinery: Ethanol, Succinic Acid and By-Product Production. Office of Scientific and Technical Information (OSTI), March 2009. http://dx.doi.org/10.2172/950487.

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Chinthapalli, Raj, Ángel Puente, Pia Skoczinski, Achim Raschka, and Michael Carus. Succinic acid: From a promising building block to a slow seller – what will a realistic future market look like? Nova-Institut GmbH, October 2019. http://dx.doi.org/10.52548/serb5106.

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Zeikus, J. G. Molecular Physiology of Succinic Acid Based Fermentation In Anaerobes: Control of Chemical Yield by CO2 Fixation and Electron Donors. Office of Scientific and Technical Information (OSTI), May 2003. http://dx.doi.org/10.2172/1183577.

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Biologically produced succinic acid: A new route to chemical intermediates. Office of Scientific and Technical Information (OSTI), January 1995. http://dx.doi.org/10.2172/10108674.

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Biologically produced succinic acid: A new route to chemical intermediates. Office of Scientific and Technical Information (OSTI), September 1995. http://dx.doi.org/10.2172/116685.

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