scholarly journals Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)

2019 ◽  
Author(s):  
Dung Van Nguyen ◽  
Pinthep Sethapokin ◽  
Harifara Rabemanolontsoa ◽  
Eiji Minami ◽  
Haruo Kawamoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Acid Catalyst ◽  
Cost Effective ◽  
Efficient Production ◽  
Acid Fermentation ◽  
Acid Yield ◽  
Moorella Thermoacetica ◽  
Nypa Fruticans ◽  
Hydrolysis Of

To valorize the underutilized nipa sap composed mainly of sucrose, glucose and fructose, acetic acid fermentation by Moorella thermoacetica was explored. Given that M. thermoacetica cannot directly metabolize sucrose, we evaluated various catalysts for the hydrolysis of this material. Oxalic acid and invertase exhibited high levels of activity towards the hydrolysis of the sucrose in nipa sap to glucose and fructose. Although these two methods consumed similar levels of energy for the hydrolysis of sucrose, oxalic acid was found to be more cost-effective. Nipa saps hydrolyzed by these two catalysts were also fermented by M. thermoacetica. The results revealed that the two hydrolyzed sap mixtures gave 10.0 g/L of acetic acid from the 10.2 g/L of substrate sugars in nipa sap. Notably, the results showed that the oxalic acid catalyst was also fermented to acetic acid, which avoided the need to remove the catalyst from the product stream. Taken together, these results show that oxalic acid hydrolysis is superior to enzymatic hydrolysis for the pretreatment of nipa sap. The acetic acid yield achieved in this study corresponds to a conversion efficiency of 98%, which is about 3.6 times higher than that achieved using the traditional methods. The process developed in this study therefore has high potential as a green biorefinery process for the efficient conversion of sucrose-containing nipa sap to bio-derived acetic acid.

scholarly journals Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)

2019 ◽  
Author(s):  
Dung Van Nguyen ◽  
Pinthep Sethapokin ◽  
Harifara Rabemanolontsoa ◽  
Eiji Minami ◽  
Haruo Kawamoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Acid Catalyst ◽  
Cost Effective ◽  
Efficient Production ◽  
Acid Fermentation ◽  
Acid Yield ◽  
Moorella Thermoacetica ◽  
Nypa Fruticans ◽  
Hydrolysis Of

To valorize the underutilized nipa sap composed mainly of sucrose, glucose and fructose, acetic acid fermentation by Moorella thermoacetica was explored. Given that M. thermoacetica cannot directly metabolize sucrose, we evaluated various catalysts for the hydrolysis of this material. Oxalic acid and invertase exhibited high levels of activity towards the hydrolysis of the sucrose in nipa sap to glucose and fructose. Although these two methods consumed similar levels of energy for the hydrolysis of sucrose, oxalic acid was found to be more cost-effective. Nipa saps hydrolyzed by these two catalysts were also fermented by M. thermoacetica. The results revealed that the two hydrolyzed sap mixtures gave 10.0 g/L of acetic acid from the 10.2 g/L of substrate sugars in nipa sap. Notably, the results showed that the oxalic acid catalyst was also fermented to acetic acid, which avoided the need to remove the catalyst from the product stream. Taken together, these results show that oxalic acid hydrolysis is superior to enzymatic hydrolysis for the pretreatment of nipa sap. The acetic acid yield achieved in this study corresponds to a conversion efficiency of 98%, which is about 3.6 times higher than that achieved using the traditional methods. The process developed in this study therefore has high potential as a green biorefinery process for the efficient conversion of sucrose-containing nipa sap to bio-derived acetic acid.

scholarly journals Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)

2019 ◽  
Author(s):  
Dung Van Nguyen ◽  
Pinthep Sethapokin ◽  
Harifara Rabemanolontsoa ◽  
Eiji Minami ◽  
Haruo Kawamoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Acid Catalyst ◽  
Cost Effective ◽  
Efficient Production ◽  
Acid Fermentation ◽  
Acid Yield ◽  
Moorella Thermoacetica ◽  
Nypa Fruticans ◽  
Hydrolysis Of

To valorize the underutilized nipa sap composed mainly of sucrose, glucose and fructose, acetic acid fermentation by Moorella thermoacetica was explored. Given that M. thermoacetica cannot directly metabolize sucrose, we evaluated various catalysts for the hydrolysis of this material. Oxalic acid and invertase exhibited high levels of activity towards the hydrolysis of the sucrose in nipa sap to glucose and fructose. Although these two methods consumed similar levels of energy for the hydrolysis of sucrose, oxalic acid was found to be more cost-effective. Nipa saps hydrolyzed by these two catalysts were also fermented by M. thermoacetica. The results revealed that the two hydrolyzed sap mixtures gave 10.0 g/L of acetic acid from the 10.2 g/L of substrate sugars in nipa sap. Notably, the results showed that the oxalic acid catalyst was also fermented to acetic acid, which avoided the need to remove the catalyst from the product stream. Taken together, these results show that oxalic acid hydrolysis is superior to enzymatic hydrolysis for the pretreatment of nipa sap. The acetic acid yield achieved in this study corresponds to a conversion efficiency of 98%, which is about 3.6 times higher than that achieved using the traditional methods. The process developed in this study therefore has high potential as a green biorefinery process for the efficient conversion of sucrose-containing nipa sap to bio-derived acetic acid.

scholarly journals Efficient Production of Acetic Acid from Nipa (Nypa fruticans) Sap by Moorella thermoacetica (f. Clostridium thermoaceticum)

2019 ◽  
Author(s):  
Dung Van Nguyen ◽  
Pinthep Sethapokin ◽  
Harifara Rabemanolontsoa ◽  
Eiji Minami ◽  
Haruo Kawamoto ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Oxalic Acid ◽  
Acid Catalyst ◽  
Cost Effective ◽  
Efficient Production ◽  
Acid Fermentation ◽  
Acid Yield ◽  
Moorella Thermoacetica ◽  
Nypa Fruticans ◽  
Hydrolysis Of

To valorize the underutilized nipa sap composed mainly of sucrose, glucose and fructose, acetic acid fermentation by Moorella thermoacetica was explored. Given that M. thermoacetica cannot directly metabolize sucrose, we evaluated various catalysts for the hydrolysis of this material. Oxalic acid and invertase exhibited high levels of activity towards the hydrolysis of the sucrose in nipa sap to glucose and fructose. Although these two methods consumed similar levels of energy for the hydrolysis of sucrose, oxalic acid was found to be more cost-effective. Nipa saps hydrolyzed by these two catalysts were also fermented by M. thermoacetica. The results revealed that the two hydrolyzed sap mixtures gave 10.0 g/L of acetic acid from the 10.2 g/L of substrate sugars in nipa sap. Notably, the results showed that the oxalic acid catalyst was also fermented to acetic acid, which avoided the need to remove the catalyst from the product stream. Taken together, these results show that oxalic acid hydrolysis is superior to enzymatic hydrolysis for the pretreatment of nipa sap. The acetic acid yield achieved in this study corresponds to a conversion efficiency of 98%, which is about 3.6 times higher than that achieved using the traditional methods. The process developed in this study therefore has high potential as a green biorefinery process for the efficient conversion of sucrose-containing nipa sap to bio-derived acetic acid.

Synthesen von Heterocyclen, CC Reaktionen mit cyclischen Oxalylverbindungen, XVIII Zur Reaktion von 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dion mit Η-aktiven Nucleophilen. / Syntheses of Heterocycles, CC Reactions of Cyclic Oxalyl Compounds, XVIII The Reaction of 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dione with Η-active Nucleophiles

1976 ◽  
Vol 31 (11) ◽  
pp. 1511-1514 ◽  
Author(s):  
Gert Kollenz ◽  
Erich Ziegler ◽  
Walter Ott ◽  
Herwig Igel
Keyword(s):  
Acetic Acid ◽  
Acrylic Acid ◽  
Oxalic Acid ◽  
Ethyl Ester ◽  
Acid Ethyl Ester ◽  
The Other ◽  
Other Hand ◽  
Hydrolysis Of ◽  
Acid Anilides

Hydrolysis of 4-Benzoyl-5-phenyl-2,3-dihydrofuran-2,3-dione (1) in water (ethanol) gives dibenzoylmethane and oxalic acid (ethyl ester). 1 reacts with aniline or p-toluidine yielding the 2-pyrrolones (2), which on the other hand are synthesized by addition of the corresponding anilines to the pyrrol-2,3-diones (8). 3 a adds methanol to give the 2-pyrrolone (4), which with aniline can be converted into 2 a. 2 a, b show fragmentation to oxalic acid anilides by heating (2 b) or treating with diazomethane (2 a). The reaction of 1 with p-nitroaniline leads via the furanone-derivative 6 to oxalic acid-di-p-nitroanilide. 1 and N-methylaniline combine to acrylic acid-N-methylanilide (7), which by heating gives the dibenzoyl acetic acid-N-methylanilide

scholarly journals Homolactic Acid Fermentation by the Genetically Engineered Thermophilic Homoacetogen Moorella thermoacetica ATCC 39073

2017 ◽  
Vol 83 (8) ◽  
Author(s):  
Yuki Iwasaki ◽  
Akihisa Kita ◽  
Koichiro Yoshida ◽  
Takahisa Tajima ◽  
Shinichi Yano ◽  
...  
Keyword(s):  
Wild Type Strain ◽  
Genetically Engineered ◽  
Efficient Production ◽  
Acetate Production ◽  
Acid Fermentation ◽  
Content Type ◽  
Moorella Thermoacetica ◽  
Double Deletion ◽  
Dehydrogenase Gene ◽  
Acetate Formation

ABSTRACT For the efficient production of target metabolites from carbohydrates, syngas, or H2-CO2 by genetically engineered Moorella thermoacetica, the control of acetate production (a main metabolite of M. thermoacetica) is desired. Although propanediol utilization protein (PduL) was predicted to be a phosphotransacetylase (PTA) involved in acetate production in M. thermoacetica, this has not been confirmed. Our findings described herein directly demonstrate that two putative PduL proteins, encoded by Moth_0864 (pduL1) and Moth_1181 (pduL2), are involved in acetate formation as PTAs. To disrupt these genes, we replaced each gene with a lactate dehydrogenase gene from Thermoanaerobacter pseudethanolicus ATCC 33223 (T-ldh). The acetate production from fructose as the sole carbon source by the pduL1 deletion mutant was not deficient, whereas the disruption of pduL2 significantly decreased the acetate yield to approximately one-third that of the wild-type strain. The double-deletion (both pduL genes) mutant did not produce acetate but produced only lactate as the end product from fructose. These results suggest that both pduL genes are associated with acetate formation via acetyl-coenzyme A (acetyl-CoA) and that their disruption enables a shift in the homoacetic pathway to the genetically synthesized homolactic pathway via pyruvate. IMPORTANCE This is the first report, to our knowledge, on the experimental identification of PTA genes in M. thermoacetica and the shift of the native homoacetic pathway to the genetically synthesized homolactic pathway by their disruption on a sugar platform.

scholarly journals Sintesis Asam Oksalat Dari Limbah Serbuk Kayu Jati (Tectona Grandis L.F.) Dengan Proses Hidrolisis Alkali

2018 ◽  
Vol 2 (1) ◽  
pp. 17
Author(s):  
Mufid Mufid ◽  
Agung Ari Wibowo ◽  
Ade Sonya Suryandari ◽  
An Nisaa’ Fithriasari ◽  
Pravianti Anindita Nastiti
Keyword(s):  
Oxalic Acid ◽  
Sodium Hydroxide ◽  
Tectona Grandis ◽  
Raw Material ◽  
Hydrolysis Time ◽  
Coarse Powder ◽  
Acid Yield ◽  
Hydrolysis Of Cellulose ◽  
Teak Wood ◽  
Hydrolysis Of

Selulosa adalah polisakarida rantai panjang penyusun serat pada tumbuhan. Hidrolisis selulosa dengan alkali kuat menghasilkan asam oksalat, asam asetat dan asam formiat. Limbah serbuk kayu jati berpotensi untuk dijadikan bahan baku pembuatan asam oksalat karena kandungan selulosa yang cukup tinggi. Hidrolisis yang dilakukan pada penelitian ini menggunakan natrium hidroksida (NaOH) sebagai zat penghidrolisis. Purifikasi asam oksalat dilakukan dengan penambahan kalsium klorida dan asam sulfat. Penelitian ini mempelajari pengaruh konsentrasi natrium hidroksida dan waktu reaksi terhadap yield asam oksalat. Produk tertinggi dengan yield 20% dicapai pada penggunaan serbuk kayu jati kasar dengan waktu hidrolisis 60 menit dan konsentrasi NaOH 1 N.Cellulose is a long chain fiber polysaccharide contained in plants. Hydrolysis of cellulose with strong alkali produces oxalic acid, acetic acid and formic acid. Waste from teak wood in powder formhas the potential to be used as raw material for the manufacture of oxalic acid because the content of cellulose is high enough. Sodium hydroxide (NaOH) as a hydrolysis agent was used in this study. Purification of formed oxalic acid was carried out by addition of calcium chloride and sulfuric acid. Our research studied the effect of sodium hydroxide concentration and reaction time on oxalic acid yield. The highest product with a yield of 20% was achieved on the use of coarse powder of teak wood waste with a hydrolysis time of 60 minutes and the concentration of NaOH 1 N.

scholarly journals Fed-batch fermentation of nipa sap to acetic acid by Moorella thermoacetica (f. Clostridium thermoaceticum)

2017 ◽  
Vol 23 (4) ◽  
pp. 507-514 ◽  
Author(s):  
Dung Nguyen ◽  
Harifara Rabemanolontsoa ◽  
Shiro Saka
Keyword(s):  
Acetic Acid ◽  
Batch Fermentation ◽  
Feeding Rate ◽  
Acetic Acid Concentration ◽  
Fed Batch ◽  
Clostridium Thermoaceticum ◽  
Acid Yield ◽  
Moorella Thermoacetica ◽  
Batch Technique ◽  
Fed Batch Fermentation

An efficient process for conversion of nipa sap to acetic acid was developed. Nipa sap was hydrolyzed with invertase and provided glucose as well as fructose as main sugars. Batch fermentation of glucose and fructose was inadequate with increased substrate concentration. By contrast, fed-batch technique on hydrolyzed nipa sap with high feeding rate drastically increased acetic acid concentration and productivity to be 42.6 g/L and 0.18 g/(L/h), respectively. All the sugars in hydrolyzed nipa sap were consumed, with acetic acid yield of 0.87 g/g sugar. Overall, nipa sap as hydrolyzed with invertase was efficiently fermented to acetic acid, which is a valuable chemical and a potential biorefinery intermediate.

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