Value-added lipid production from brown seaweed biomass by two-stage fermentation using acetic acid bacterium and thraustochytrid

2014 ◽  
Vol 98 (22) ◽  
pp. 9207-9216 ◽  
Author(s):  
Kim Hazel V. Arafiles ◽  
Hiroaki Iwasaka ◽  
Yuri Eramoto ◽  
Yoshiko Okamura ◽  
Takahisa Tajima ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Lipid Production ◽  
Brown Seaweed ◽  
Value Added ◽  
Acetic Acid Bacterium ◽  
Two Stage ◽  
Seaweed Biomass

Extracting value-added products before pulping: Hemicellulosic ethanol from Eucalyptus globulus wood

Holzforschung ◽  
2012 ◽  
Vol 66 (5) ◽  
pp. 591-599 ◽  
Author(s):  
Julio Rodríguez-López ◽  
Aloia Romaní ◽  
María J. González-Muñoz ◽  
Gil Garrote ◽  
Juan C. Parajó
Keyword(s):  
Acetic Acid ◽  
Eucalyptus Globulus ◽  
Value Added ◽  
Pichia Stipitis ◽  
Two Stage ◽  
Stage Process ◽  
Hot Compressed Water ◽  
Fermentation Media ◽  
Value Added Products ◽  
Membrane Concentration

Abstract Xylose solutions have been produced from Eucalyptus globulus wood by autohydrolysis (with hot, compressed water) and post-hydrolysis (in presence of sulfuric acid). This two-stage process led to solids enriched in cellulose and lignin (suitable as a substrate for pulping) and liquors containing xylose as the major component. The liquid phase from post-hydrolysis also contained other sugars (glucose, arabinose) and acetic acid. Neutralized liquors (as obtained, or after membrane concentration), were employed (directly or after detoxification by ion exchange) as fermentation media for the production of hemicelluosic bioethanol with the yeast Pichia stipitis CECT 1922T. Under the best conditions assayed (fermentation of neutralized, concentrated and detoxified two-stage hydrolysis liquors), bioconversion took place at nearly stoichiometric yield, with a volumetric productivity of 0.37 g l-1·h-1.

scholarly journals Acetobacter sacchari sp. nov., for a plant growth-promoting acetic acid bacterium isolated in Vietnam

2019 ◽  
Vol 69 (11) ◽  
pp. 1155-1163 ◽  
Author(s):  
Huong Thi Lan Vu ◽  
Pattaraporn Yukphan ◽  
Van Thi Thu Bui ◽  
Piyanat Charoenyingcharoen ◽  
Sukunphat Malimas ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Plant Growth ◽  
Acetic Acid Bacterium ◽  
Plant Growth Promoting ◽  
Growth Promoting

scholarly journals Effectiveness of a two-stage strategy with HPV testing followed by visual inspection with acetic acid for cervical cancer screening in a low-income setting

2014 ◽  
Vol 136 (6) ◽  
pp. E743-E750 ◽  
Author(s):  
Pierre-Marie Tebeu ◽  
Joël Fokom-Domgue ◽  
Victoria Crofts ◽  
Emmanuel Flahaut ◽  
Rosa Catarino ◽  
...  
Keyword(s):  
Cervical Cancer ◽  
Acetic Acid ◽  
Cancer Screening ◽  
Cervical Cancer Screening ◽  
Low Income ◽  
Visual Inspection ◽  
Hpv Testing ◽  
Two Stage ◽  
Low Income Setting

scholarly journals Valorization of secondary feedstocks from the agroindustry by selective catalytic oxidation to formic and acetic acid using the OxFA process

2021 ◽  
Author(s):  
Sebastian Ponce ◽  
Stefanie Wesinger ◽  
Daniela Ona ◽  
Daniela Almeida Streitwieser ◽  
Jakob Albert
Keyword(s):  
Acetic Acid ◽  
Formic Acid ◽  
Reaction System ◽  
Value Added ◽  
Industrial Wastes ◽  
Raw Material ◽  
Gaseous Oxygen ◽  
Water As Solvent ◽  
Selective Catalytic Oxidation ◽  
Major Interest

AbstractThe selective oxidative conversion of seven representative fully characterized biomasses recovered as secondary feedstocks from the agroindustry is reported. The reaction system, known as the “OxFA process,” involves a homogeneous polyoxometalate catalyst (H8PV5Mo7O40), gaseous oxygen, p-toluene sulfonic acid, and water as solvent. It took place at 20 bar and 90 °C and transformed agro-industrial wastes, such as coffee husks, cocoa husks, palm rachis, fiber and nuts, sugarcane bagasse, and rice husks into biogenic formic acid, acetic acid, and CO2 as sole products. Even though all samples were transformed; remarkably, the reaction obtains up to 64, and 55% combined yield of formic and acetic acid for coffee and cocoa husks as raw material within 24 h, respectively. In addition to the role of the catalysts and additive for promoting the reaction, the influence of biomass components (hemicellulose, cellulose and lignin) into biogenic formic acid formation has been also demonstrated. Thus, these results are of major interest for the application of novel oxidation techniques under real recovered biomass for producing value-added products. Graphical abstract

scholarly journals Cheese whey recycling in traditional dairy food chain: effects of vinegar from whey in dairy cow nutrition

2013 ◽  
Vol 2 (1s) ◽  
pp. 8 ◽  
Author(s):  
Giuseppe Lustrato ◽  
Elisabetta Salimei ◽  
Gabriele Alfano ◽  
Claudia Belli ◽  
Francesco Fantuz ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Milk Yield ◽  
Cheese Whey ◽  
Nutrient Recycling ◽  
Dietary Treatment ◽  
Experimental Tests ◽  
Acetic Acid Bacterium ◽  
Acetobacter Aceti ◽  
Acetic Acid Production ◽  
Acid Yield

Selected yeast (<em>Kluyveromyces marxianus</em> Y102 strain) and an acetic acid bacterium (<em>Acetobacter aceti</em>, DSM-G3508 strain) were used as inocula respectively in cheese whey for alcoholic and acetic fermentations. The experimental tests were carried out at both laboratory and pilot plant (20 L and 2000 L) levels. The data from the trials (working period 28 days) show increased ethanol production, increased acetic acid yield, and greater fermentation stability with biomass recycling (18.6 g L<sup>&ndash;1</sup>). Batch and fed-batch fermentation tests resulted in increased and standardized alcoholic fermentation, and allowed acetic acid recovery (average lactose consumption 56%, ethanol 6.7 g L<sup>&ndash;1</sup> d<sup>&ndash;1</sup> and acetic acid production 4.35 g L<sup>&ndash;1</sup> d<sup>&ndash;1</sup>). The effects administration were then investigated on milk yield and composition, nutritional status of dairy cows and physical characteristics of total mixed ration (TMR). Twenty Holstein cows were divided into two groups; group C, receiving the traditional TMR, and group W, receiving the TMR plus 10 L wheynegar. The dietary treatment, lasted 35 days, did not affect milk yield and composition except for the urea content, significantly lowered in group W. The selection of coarse (&lt;19 mm), medium (8-19 mm) and fine (&lt;8 mm) dietary particles was not influenced by the wheynegar administration however a tendential lower selection against coarse particles was noted in W. The results highlight that microbial biotechnologies may significantly contribute to both the valorization of whey and the development of a stable nutrient recycling system as a ingredient in dairy cattle diet.

scholarly journals Catalytic valorization of hardwood for enhanced xylose-hydrolysate recovery and cellulose enzymatic efficiency via synergistic effect of Fe3+ and acetic acid

2019 ◽  
Vol 12 (1) ◽  
Author(s):  
Kaixuan Huang ◽  
Lalitendu Das ◽  
Jianming Guo ◽  
Yong Xu
Keyword(s):  
Acetic Acid ◽  
Synergistic Effect ◽  
Paper Industry ◽  
Enzymatic Saccharification ◽  
Value Added ◽  
Lewis Acid Site ◽  
Aqueous Acetic Acid ◽  
Xylan Degradation ◽  
Hydrolysis Process ◽  
Xylonic Acid

Abstract Background Poplars are considered suitable dedicated energy crops, with abundant cellulose and hemicellulose, and huge surplus biomass potential in China. Xylan, the major hemicellulosic component, contributes to the structural stability of wood and represents a tremendous quantity of biobased chemicals for fuel production. Monomeric xylose conversion to value-added chemicals such as furfural, xylitol, and xylonic acid could greatly improve the economics of pulp-paper industry and biorefinery. Acetic acid (HAc) is used as a friendly and recyclable selective catalyst amenable to xylan degradation and xylooligosaccharides production from lignocellulosic materials. However, HAc catalyst usually works much feebly at inert woods than agricultural straws. In this study, effects of different iron species in HAc media on poplar xylan degradation were systematically compared, and a preferable Fe3+-assisted HAc hydrolysis process was proposed for comparable xylose-hydrolysate recovery (XHR) and enzymatic saccharification of cellulose. Results In presence of 6.5% HAc with 0.17–0.25 wt% Fe3+, xylose yield ranged between 72.5 and 73.9%. Additionally, pretreatment was effective in poplar delignification, with a lignin yield falling between 38.6 and 42.5%. Under similar conditions, saccharification efficiency varied between 60.3 and 65.9%. Starting with 100 g poplar biomass, a total amount of 12.7–12.8 g of xylose and 18.8–22.8 g of glucose were harvested from liquid streams during the whole process of Fe3+-HAc hydrolysis coupled with enzymatic saccharification. Furthermore, the enhancement mechanism of Fe3+ coupled with HAc was investigated after proof-of-concept experiments. Beechwood xylan and xylose were treated under the same condition as poplar sawdust fractionation, giving understanding of the effect of catalysts on the hydrolysis pathway from wood xylan to xylose and furfural by Fe3+-HAc. Conclusions The Fe3+-assisted HAc hydrolysis process was demonstrated as an effective approach to the wood xylose and other monosaccharides production. Synergistic effect of Lewis acid site and aqueous acetic acid provided a promising strategy for catalytic valorization of poplar biomass.

scholarly journals Effect of Corrosive Media on the Chemical and Mechanical Resistance of IPS e.max® CAD Based Li2Si2O5 Glass-Ceramics

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 365
Author(s):  
Anna Švančárková ◽  
Dagmar Galusková ◽  
Aleksandra Ewa Nowicka ◽  
Helena Pálková ◽  
Dušan Galusek
Keyword(s):  
Wear Resistance ◽  
Acetic Acid ◽  
Prolonged Exposure ◽  
Glass Ceramics ◽  
Mechanical Resistance ◽  
Two Stage ◽  
Lithium Metasilicate ◽  
Dynamic Conditions ◽  
One Stage ◽  
Stage Process

The influence of 4% acetic acid (pH~2.4) and an alkaline solution of NaOH (pH~10) on the corrosion resistance and micromechanical properties of disilicate crystals containing glass-ceramics (LS2-GC’s) is studied. Partially crystallized lithium metasilicate crystal containing glass-ceramics (LS-GC’s) are annealed to fully LS2-GC’s using a one stage and a two-stage heating to induce nucleation. Materials with various chemical and wear resistance are prepared. The content of the crystalline phase in the material annealed in the two-stage process A is 60.0% and increases to 72.2% for the material heated in the one-stage process B. The main elements leached in the acidic medium are lithium and phosphorus, while lithium, silicon, and phosphorus leached into the alkaline environment. Material B exhibits better chemical resistance to the corrosive influence of 4% acetic acid under quasi-dynamic conditions. In the alkaline corrosion medium, silicon is leached from material A faster compared to the material B. After prolonged exposure to acidic or basic environments, both materials show evidence of surface structural changes. A decrease of the sliding wear resistance is observed after corrosion in the acidic environment under dynamic conditions. In both materials, the wear rate increases after corrosion.

scholarly journals Optimization of H2 Production through Minimization of CO2 Emissions by Mixed Cultures of Purple Phototrophic Bacteria in Aqueous Samples

Water ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 2015
Author(s):  
I.A. Vasiliadou ◽  
J.A. Melero ◽  
R. Molina ◽  
D. Puyol ◽  
F. Martinez
Keyword(s):  
Acetic Acid ◽  
Carbon Dioxide Emissions ◽  
Co2 Emission ◽  
Production Efficiency ◽  
Reducing Power ◽  
Value Added ◽  
H2 Production ◽  
Phototrophic Bacteria ◽  
Mixed Cultures ◽  
Production Of Hydrogen

One of the current challenges in the treatment of wastewater is the recovery and/or transformation of their resources into high value-added products, such as biohydrogen. The aim of the present study was to optimize the production of hydrogen by mixed cultures of purple phototrophic bacteria (PPB), targeting in low CO2 emission. Batch assays were conducted using different carbon (malic, butyric, acetic acid) and nitrogen (NH4Cl, Na-glutamate, N2 gas) sources by varying the chemical oxygen demand to nitrogen ratio (COD:N 100:3 to 100:44), under infrared radiation as sole energy source. Malate-glutamate (COD:N 100:5.5) and malate-NH4-N (COD:N 100:3) fed cultures, exhibited high H2 production rates of 2.3 and 2.5 mLH2/Lh, respectively. It was observed that the use of glutamate decreased the CO2 emission by 74% (13.4 mLCO2/L) as compared to NH4-N. The H2 production efficiency achieved by organic carbon substrates in combination with glutamate, was in the order of malic (370 mLH2/L) > butyric (145 mLH2/L) > acetic acid (95 mLH2/L). These substrates entailed partitioning of reducing power into biomass at 64%, 50% and 48%, respectively, whereas reductants were derived to biohydrogen at 5.8%, 6.1% and 2.1%, respectively. These results suggest that nitrogen source and carbon dioxide emissions play an important role in the optimization of hydrogen production by PPB.

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