Na2HPO4-modified NaY nanocrystallites: efficient catalyst for acrylic acid production through lactic acid dehydration

2014 ◽  
Vol 4 (5) ◽  
pp. 1376-1385 ◽  
Author(s):  
Junfeng Zhang ◽  
Yuling Zhao ◽  
Xinzhen Feng ◽  
Min Pan ◽  
Jing Zhao ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Acid Production ◽  
Surface Acidity ◽  
Formation Rate ◽  
Structural Features ◽  
Efficient Catalyst ◽  
Acid Yield

An acrylic acid yield of 74.3% and a formation rate of 12.0 mmol gcat−1 h−1 have been achieved at 340 °C by lactic acid dehydration over Na2HPO4-modified NaY nanocrystallites (NaY-n) due to appropriate surface acidity together with the unique structural features of NaY-n.

scholarly journals Lanthanum phosphate: an efficient catalyst for acrylic acid production through lactic acid dehydration

2020 ◽  
Author(s):  
Nagaraju Nekkala ◽  
Putrakumar Balla ◽  
Srinivasa Rao Ginjupalli ◽  
Prem Kumar Seelam ◽  
Hussain S.K. ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Acid Production ◽  
Efficient Catalyst ◽  
Lanthanum Phosphate

scholarly journals Use of wheat straw and chicken feather hydrolysates as a complete medium for lactic acid production

2018 ◽  
Vol 36 (No. 2) ◽  
pp. 146-153 ◽  
Author(s):  
Gharwalová Lucia ◽  
Paulová Leona ◽  
Patáková Petra ◽  
Branská Barbora ◽  
Melzoch Karel
Keyword(s):  
Lactic Acid ◽  
Wheat Straw ◽  
Acid Production ◽  
Low Cost ◽  
Lactic Acid Production ◽  
Nitrogen Sources ◽  
Batch Process ◽  
Complete Medium ◽  
Biotechnological Production ◽  
Acid Yield

Biotechnological production of lactic acid has experienced a boom that is hindered only by the lack of low-cost, abundant material that might be used as a substrate for lactic acid bacteria. Such material should contain not only carbon but also complex nitrogen sources, amino acids and vitamins necessary for the balanced growth of the bacteria. Here, for the first time, a combination of hydrolysates of wheat straw and chicken feathers was used as a complete waste cultivation medium for lactic acid production. It was shown to be a promising substrate for lactic acid production, reducing the medium price by 73% compared with MRS broth, providing more than 98% lactic acid yield and high productivity (2.28 ± 0.68 g/l/h) in a fed-batch process using Lactobacillus reuterii LHR14.

Nonstoichiometric calcium pyrophosphate: a highly efficient and selective catalyst for dehydration of lactic acid to acrylic acid

RSC Advances ◽  
2014 ◽  
Vol 4 (63) ◽  
pp. 33319-33326 ◽  
Author(s):  
Vidhya C. Ghantani ◽  
Mohan K. Dongare ◽  
Shubhangi B. Umbarkar
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Catalyst Surface ◽  
Calcium Pyrophosphate ◽  
Calcium Lactate ◽  
Acid Yield ◽  
Selective Catalyst ◽  
Highly Efficient

Lactic acid dehydration using a non-stoichiometric calcium pyrophosphate catalyst (Ca/P ratio 0.78) has resulted in 78% acrylic acid yield due to formation of calcium lactate as an intermediate on the catalyst surface.

scholarly journals Selection of the StrainLactobacillus acidophilusATCC 43121 and Its Application to Brewers’ Spent Grain Conversion into Lactic Acid

2015 ◽  
Vol 2015 ◽  
pp. 1-9 ◽  
Author(s):  
Rossana Liguori ◽  
Carlos Ricardo Soccol ◽  
Luciana Porto de Souza Vandenberghe ◽  
Adenise Lorenci Woiciechowski ◽  
Elena Ionata ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Yeast Extract ◽  
Acid Production ◽  
Lactic Acid Production ◽  
Synthetic Medium ◽  
Glucose Consumption ◽  
Acid Yield ◽  
Aqueous Ammonia Soaking ◽  
Spent Grain ◽  
Selection Of

SixLactobacillusstrains were analyzed to select a bacterium for conversion of brewers’ spent grain (BSG) into lactic acid. Among the investigated strains,L. acidophilusATCC 43121 showed the highest yield of lactic acid production (16.1 g/L after 48 hours) when grown in a synthetic medium. It was then analyzed for its ability to grow on the hydrolysates obtained from BSG after acid-alkaline (AAT) or aqueous ammonia soaking (AAS) pretreatment. The lactic acid production byL. acidophilusATCC 43121 through fermentation of the hydrolysate from AAS treated BSG was 96% higher than that from the AAT treated one, although similar yields of lactic acid per consumed glucose were achieved due to a higher (46%) glucose consumption byL. acidophilusATCC 43121 in the AAS BSG hydrolysate. It is worth noting that adding yeast extract to the BSG hydrolysates increased both the yield of lactic acid per substrate consumed and the volumetric productivity. The best results were obtained by fermentation of AAS BSG hydrolysate supplemented by yeast extract, in which the strain produced 22.16 g/L of lactic acid (yield of 0.61 g/g), 27% higher than the value (17.49 g/L) obtained in the absence of a nitrogen source.

Magnesium Hydrogen Phosphate: An Efficient Catalyst for Acrylic Acid Production from Biorenewable Lactic Acid

2021 ◽  
Vol 21 (3) ◽  
pp. 1537-1548
Author(s):  
Nagaraju Nekkala ◽  
Putrakumar Balla ◽  
Srinivasarao Ginjupalli ◽  
Harisekher Mitta ◽  
S. K. Hussain ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Acrylic Acid ◽  
Biomass Conversion ◽  
Catalytic Performance ◽  
Hydrogen Phosphate ◽  
Efficient Catalyst ◽  
Synthetic Process ◽  
Calcination Temperatures ◽  
Lewis Acidic Sites ◽  
Acidic Sites

A series of Magnesium hydrogen phosphate (MgHP) catalysts with different magnesium to phosphorous (Mg/P) mole ratios at varying calcination temperatures has been synthesised, bearing in mind the effectiveness as well as the stability of MgHP to catalyse acrylic acid (AA) production from biorenewable lactic acid (LA), a synthetic process applicable to biomass conversion. The physicochemical properties of the MgHP catalysts have been thoroughly characterised and the formation of Mg(NH4)PO4, MgHPO4 and Mg2P2O7 with different structural and acidic properties have been reported. The high catalytic performance of MgHP catalysts with high AA yields (100% conversion and 85% selectivity) at high space velocities (WHSVLA = 3.13 h−1) have been achieved at 360 °C. NH3-Temperature programmed desorption (TPD) and pyridine FTIR have shown that the effectiveness of a catalyst is accounted for not primarily by the actual strength of acidic sites, but is due to the presence of Lewis acidic sites compared to Bronsted sites.

scholarly journals Microbial Interactions between Amylolytic and Non-Amylolytic Lactic Acid Bacteria Strains Isolated during the Fermentation of Pozol

2021 ◽  
Author(s):  
Sandra Bolaños-Nuñez ◽  
Jorge A. Santiago-Urbina ◽  
Jean-Pierre Guyot ◽  
Gloria Díaz-Ruiz ◽  
Carmen Wacher
Keyword(s):  
Growth Rate ◽  
Lactic Acid ◽  
Specific Growth Rate ◽  
Kinetic Parameters ◽  
Acid Production ◽  
Specific Growth ◽  
Lactic Acid Production ◽  
Amylolytic Activity ◽  
Specific Rate ◽  
Acid Yield

Pozol is a Mexican beverage prepared from fermented nixtamalized maize dough. To contribute to understanding its complex microbial ecology, the effect of inoculating on MRS-starch pure and mixed cultures of amylolytic Sii-25124 and non-amylolytic W. confusa 17, isolated from pozol, were studied on their interactions and fermentation parameters. These were compared with L. plantarum A6, an amylolytic strain isolated from cassava. Microbial growth, kinetic parameters, amylolytic activity, lactic acid production, and hydrolysis products from starch fermentation were measured. The population dynamics were followed by qPCR. L. plantarum A6 showed higher enzymatic activity, lactic acid, biomass production, and kinetic parameters than pozol LAB in pure cultures. Mixed culture of each pozol LAB with L. plantarum A6 showed a significant decrease in amylolytic activity, lactic acid yield, specific growth rate, and specific rate of amylase production. The interaction between Sii-25124 and W. confusa 17 increased the global maximum specific growth rate (µ), the lactic acid yield from starch (Ylac/s), lactic acid yield from biomass (Ylac/x), and specific rate of lactic acid production (qlac) by 15, 30, 30, and 40%, respectively compared with the pure culture of Sii-25124. Interactions between the two strains are essential for this fermentation.

scholarly journals Efficient lactic acid production from dilute acid-pretreated lignocellulosic biomass by a synthetic consortium of engineered Pseudomonas putida and Bacillus coagulans

2021 ◽  
Vol 14 (1) ◽  
Author(s):  
Lihua Zou ◽  
Shuiping Ouyang ◽  
Yueli Hu ◽  
Zhaojuan Zheng ◽  
Jia Ouyang
Keyword(s):  
Lactic Acid ◽  
Pseudomonas Putida ◽  
Lignocellulosic Biomass ◽  
Acid Production ◽  
Levulinic Acid ◽  
Lactic Acid Production ◽  
Value Added ◽  
Bacillus Coagulans ◽  
Lignocellulosic Hydrolysate ◽  
Acid Yield

Abstract Background Lignocellulosic biomass is an attractive and sustainable alternative to petroleum-based feedstock for the production of a range of biochemicals, and pretreatment is generally regarded as indispensable for its biorefinery. However, various inhibitors that severely hinder the growth and fermentation of microorganisms are inevitably produced during the pretreatment of lignocellulose. Presently, there are few reports on a single microorganism that can detoxify or tolerate toxic mixtures of pretreated lignocellulose hydrolysate while effectively transforming sugar components into valuable compounds. Alternatively, microbial coculture provides a simpler and more efficacious way to realize this goal by distributing metabolic functions among different specialized strains. Results In this study, a novel synthetic microbial consortium, which is composed of a responsible for detoxification bacterium engineered Pseudomonas putida KT2440 and a lactic acid production specialist Bacillus coagulans NL01, was developed to directly produce lactic acid from highly toxic lignocellulosic hydrolysate. The engineered P. putida with deletion of the sugar metabolism pathway was unable to consume the major fermentable sugars of lignocellulosic hydrolysate but exhibited great tolerance to 10 g/L sodium acetate, 5 g/L levulinic acid, 10 mM furfural and HMF as well as 2 g/L monophenol compound. In addition, the engineered strain rapidly removed diverse inhibitors of real hydrolysate. The degradation rate of organic acids (acetate, levulinic acid) and the conversion rate of furan aldehyde were both 100%, and the removal rate of most monoaromatic compounds remained at approximately 90%. With detoxification using engineered P. putida for 24 h, the 30% (v/v) hydrolysate was fermented to 35.8 g/L lactic acid by B. coagulans with a lactic acid yield of 0.8 g/g total sugars. Compared with that of the single culture of B. coagulans without lactic acid production, the fermentation performance of microbial coculture was significantly improved. Conclusions The microbial coculture system constructed in this study demonstrated the strong potential of the process for the biosynthesis of valuable products from lignocellulosic hydrolysates containing high concentrations of complex inhibitors by specifically recruiting consortia of robust microorganisms with desirable characteristics and also provided a feasible and attractive method for the bioconversion of lignocellulosic biomass to other value-added biochemicals.

scholarly journals Effective D-lactic acid production from corncobs by simultaneous saccharification and fermentation using metabolically engineered Lactobacillus plantarum

2021 ◽  
Author(s):  
Jun-ichi Horiuchi ◽  
Syuka Naito ◽  
Yoichi Kumada ◽  
Kenji Okano ◽  
Akihiko Kondo ◽  
...  
Keyword(s):  
Lactic Acid ◽  
Lactobacillus Plantarum ◽  
Acid Production ◽  
Simultaneous Saccharification And Fermentation ◽  
Lactic Acid Production ◽  
Enzymatic Saccharification ◽  
Optical Purity ◽  
Acid Yield ◽  
Corncob Hydrolysate ◽  
Simultaneous Saccharification

A metabolically engineered Lactobacillus plantarum mutant, which could produce D-lactic acid from both glucose and xylose, was applied for the production of optically pure D-lactic acid from corncobs by simultaneous saccharification and fermentation (SSF). Using a corncob hydrolysate obtained by a combination of dilute acid treatment using 1.5% H2SO4 followed by enzymatic saccharification, the L. plantarum mutant completely assimilated both glucose and xylose in the corncob hydrolysate within 20 hours, resulting in the successful production of D-lactic acid with high optical purity in a batch culture. To improve the performance of D-lactic acid production from corncobs, SSF experiments from 100 to 250 g/L of acid-hydrolyzed corncobs using 1.5% H2SO4 were performed, and 49.7 to 101 g/L of D-lactic acid with 96.8-98.6% of optical purity was successfully produced. The D-lactic acid yield from corncobs (YL/C) was approx. 0.61 when 100-150 g/L of acid-hydrolyzed corncobs was used; however, the YL/C decreased to 0.49 as the concentration of acid-hydrolyzed corncobs because of insufficient acid hydrolysis of the corncobs. Therefore, by increasing the H2SO4 concentration to 3.5%, D-lactic acid production from corncobs significantly increased to 134 g/L with YL/C of 0.63 and 2.88 g/(L･h) of productivity from 250 g/L of acid-hydrolyzed corncobs.

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