scholarly journals Robust, site-specifically immobilized phenylalanine ammonia-lyases for the enantioselective ammonia addition to cinnamic acids

2021 ◽  
Author(s):  
Krisztina Boros ◽  
Mădălina Elena Moisă ◽  
Csaba Levente Nagy ◽  
Csaba Paizs ◽  
Monica Ioana Tosa ◽  
...  
Keyword(s):  
Cinnamic Acid ◽  
Ammonia Concentration ◽  
Reverse Reaction ◽  
Cinnamic Acids ◽  
Oxidative Deamination ◽  
High Ammonia ◽  
Ammonia Addition

Phenylalanine ammonia-lyases (PALs) catalyse the non-oxidative deamination of L-phenylalanine to trans-cinnamic acid, while in the presence of high ammonia concentration the synthetically attractive reverse reaction occurs. Although intensively studied, the...

Effect of Aeration on Fresh and Aged Municipal Solid Waste in a Simulated Landfill Bioreactor

2004 ◽  
Vol 39 (3) ◽  
pp. 223-229 ◽  
Author(s):  
Mostafa A. Warith ◽  
Graham J. Takata
Keyword(s):  
Municipal Solid Waste ◽  
Solid Waste ◽  
Ammonia Concentration ◽  
Air Injection ◽  
Bioreactor Landfills ◽  
Time To Stabilization ◽  
High Ammonia ◽  
Simulated Landfill ◽  
Term Monitoring

Abstract Municipal solid waste (MSW) is slow to stabilize under conventional anaerobic landfill conditions, demanding long-term monitoring and pollution control. Provision of aerobic conditions offers several advantages including accelerated leachate stabilization, increased landfill airspace recovery and a reduction in greenhouse gas emissions. Air injection was applied over 130 days to bench-scale bioreactors containing fresh and aged MSW representative of newly constructed and pre-existing landfill conditions. In the fresh MSW simulation bioreactors, aeration reduced the average time to stabilization of leachate pH by 46 days, TSS by 42 days, TDS by 84 days, BOD5 by 46 days and COD by 32 days. In addition, final leachate concentrations were consistently lower in aerated test cells. There was no indication of a gradual decrease in the concentration of ammonia, and it is likely this high ammonia concentration would continue to be problematic in bioreactor landfill applications. This study focussed only on biodegradability of organics in the solid waste. The concentrations of the nonreactive or conservative substances such as chloride and/or heavy metals remain in the bioreactor landfills due to the continuous recirculation of leachate. The results of this study demonstrate the potential for air injection to accelerate stabilization of municipal solid waste, with greatest influence on fresh waste with a high biodegradable organic fraction.

scholarly journals Overcoming ammonia inhibition in anaerobic blackwater treatment with granular activated carbon: the role of electroactive microorganisms

2019 ◽  
Vol 5 (2) ◽  
pp. 383-396 ◽  
Author(s):  
Anna Patrícya Florentino ◽  
Ahmed Sharaf ◽  
Lei Zhang ◽  
Yang Liu
Keyword(s):  
Activated Carbon ◽  
Hydrogen Exchange ◽  
Granular Activated Carbon ◽  
Ammonia Concentration ◽  
Anaerobic Digesters ◽  
Ammonia Inhibition ◽  
High Ammonia

Methanogenesis and enrichment of microorganisms capable of interspecies electron and/or hydrogen exchange was investigated with addition of granular activated carbon (GAC) to batch anaerobic digesters treating vacuum collected blackwater with high ammonia concentration.

METABOLISM OF PHENYLPROPANOID COMPOUNDS IN SALVIA: II. BIOSYNTHESIS OF PHENOLIC CINNAMIC ACIDS

1959 ◽  
Vol 37 (1) ◽  
pp. 537-547 ◽  
Author(s):  
D. R. McCalla ◽  
A. C. Neish
Keyword(s):  
Caffeic Acid ◽  
Phenolic Acids ◽  
Cinnamic Acid ◽  
Shikimic Acid ◽  
Sinapic Acid ◽  
Coumaric Acid ◽  
Cinnamic Acids ◽  
Phenyllactic Acid ◽  
Salvia Splendens ◽  
Specific Activities

p-Coumaric, caffeic, ferulic, and sinapic acids were found to occur in Salvia splendens Sello in alkali-labile compounds of unknown constitution. A number of C14-labelled compounds were administered to leafy cuttings of salvia and these phenolic acids were isolated after a metabolic period of several hours and their specific activities measured. Cinnamic acid, dihydrocinnamic acid, L-phenylalanine, and (−)-phenyllactic acid were found to be good precursors of the phenolic acids. D-Phenylalanine, L-tyrosine, and (+)-phenyllactic acid were poor precursors. A kinetic study of the formation of the phenolic acids from L-phenylalanine-C14 gave data consistent with the view that p-coumaric acid → caffeic acid → ferulic acid → sinapic acid, and that these compounds can act as intermediates in lignification. Feeding of C14-labelled members of this series showed that salvia could convert any one to a more complex member of the series but not so readily to a simpler member. Caffeic acid-β-C14 was obtained from salvia after the feeding of L-phenylalanine-β-C14 or cinnamic acid-β-C14, and caffeic acid labelled only in the ring was obtained after feeding generally labelled shikimic acid.

scholarly journals Design and Effects of the Cinnamic Acids Chemical Structures as Organocatalyst on the Polymerization of Benzoxazines

Polymers ◽  
2020 ◽  
Vol 12 (7) ◽  
pp. 1527
Author(s):  
Rocío B. Rodríguez ◽  
Daniela Iguchi ◽  
Rosa Erra-Balsells ◽  
M. Laura Salum ◽  
Pablo Froimowicz
Keyword(s):  
Acid Derivative ◽  
Cinnamic Acid ◽  
Catalytic Effect ◽  
Geometric Isomers ◽  
Cinnamic Acids ◽  
Cinnamic Acid Derivative ◽  
Chemical Structures ◽  
Methoxycinnamic Acid

This study focuses on the catalytic effect of the two geometric isomers of a cinnamic acid derivative, E and Z-forms of 3-methoxycinnamic acid (3OMeCA), analyzing the influence of their chemical structures. E and Z-3OMeCA isomers show very good catalytic effect in the polymerization of benzoxazines, decreasing by 40 and 55 °C, respectively, the polymerization temperatures, for catalyst contents of up to 10% w/w. Isothermal polymerizations show that polymerizations are easily realized and analyzed at temperatures as low as 130 °C and at much shorter times using Z-3OMeCA instead of E-3OMeCA. Thus, both cinnamic acids are good catalysts, with Z-3OMeCA being better. The molecular reasons for this difference and mechanistic implications in benzoxazine polymerizations are also presented.

Visible-light promoted oxidative cyclization of cinnamic acid derivatives using xanthone as the photocatalyst

2021 ◽  
Author(s):  
Bin Zhao ◽  
Bo Xu
Keyword(s):  
Double Bond ◽  
Visible Light ◽  
Cinnamic Acid ◽  
Oxidative Cyclization ◽  
Coumarin Derivatives ◽  
Cinnamic Acids ◽  
Cinnamic Acid Derivatives ◽  
Double Bond Isomerization ◽  
Photocatalytic Synthesis

We have developed an efficient photocatalytic synthesis of coumarin derivatives via a tandem double bond isomerization/oxidative cyclization of cinnamic acids.

scholarly journals N-alkylimidazolium Salts Functionalized with p-Coumaric and Cinnamic Acid: A Study of Their Antimicrobial and Antibiofilm Effects

Molecules ◽  
2019 ◽  
Vol 24 (19) ◽  
pp. 3484
Author(s):  
Oscar Forero-Doria ◽  
Ramiro Araya-Maturana ◽  
Anggela Barrientos-Retamal ◽  
Luis Morales-Quintana ◽  
Luis Guzmán
Keyword(s):  
Antibacterial Activity ◽  
Cinnamic Acid ◽  
Bacterial Infections ◽  
Bacterial Resistance ◽  
Good Alternative ◽  
Antibiofilm Activity ◽  
Coumaric Acid ◽  
Cinnamic Acids ◽  
Gram Positive Bacteria ◽  
Therapeutic Alternatives

The bacterial resistance to antibiotics has compromised the therapies used for bacterial infections. Nowadays, many strategies are being carried out to address this problem. Among them, the use of natural compounds like cinnamic and p-coumaric acids stands out. Nevertheless, their utilization is limited because of their unfavorable physicochemical properties. Due to the lack of new therapeutic alternatives for bacterial infections, novel strategies have emerged, such as the use of ionic liquids; given that they can show a broad spectrum of antibacterial activity, this is why we herein report the antibacterial and antibiofilm activity of a series of N-alkylimidazolium salts functionalized with p-coumaric and cinnamic acids. The results from this study showed better antibacterial activity against Gram-positive bacteria, with a predominance of the salts derived from coumaric acid and a correlation with the chain length. Additionally, a lower efficacy was observed in the inhibition of biofilm formation, highlighting the antibiofilm activity against Staphylococcus aureus, which decreased the production of the biofilm by 52% over the control. In conclusion, we suggest that the salts derived from p-coumaric acid are good alternatives as antibacterial compounds. Meanwhile, the salt derived from cinnamic acid could be a good alternative as an antibiofilm compound.

scholarly journals Alp Inhibitors: Vanadyl(IV) Complexes Of Ferulic And Cinnamic Acid

2005 ◽  
Vol 60 (3) ◽  
pp. 305-311 ◽  
Author(s):  
Evelina G. Ferrer ◽  
María V. Salinas ◽  
María J. Correa ◽  
Fernanda Vrdoljak ◽  
Patricia A. M. Williams
Keyword(s):  
Alkaline Phosphatase ◽  
Cinnamic Acid ◽  
Alkaline Phosphatase Activity ◽  
Elemental Analysis ◽  
Diffuse Reflectance ◽  
Quinic Acid ◽  
Inhibitory Effect ◽  
Cinnamic Acids ◽  
Ir And Raman Spectroscopies ◽  
Ir And Raman

Two new vanadyl(IV) carboxylate complexes have been obtained: Na2[VO(Fer)2(CH3OH)2] and Na2[VO(Cin)2(CH3O)2] and characterized by elemental analysis and UV-vis, diffuse reflectance and IR and Raman spectroscopies (FerH2 = ferulic acid, CinH= cinnamic acid). The thermal behavior was also investigated. The inhibitory effect on alkaline phosphatase activity was tested for the compounds and ferulic and cinnamic acids as well as for the vanadyl(IV) complex of quinic acid for comparison. The ferulic complex together with the free ligands exhibited the lowest inhibitory effect, while the VO/quinic and VO/cinnamic complexes showed an intermediate inhibition potential

Photocatalytic Degradation of High Ammonia Concentration Water Solutions by TiO2

2005 ◽  
Vol 95 (5) ◽  
pp. 335-343 ◽  
Author(s):  
Sandro Maria Murgia ◽  
Antonio Poletti ◽  
Roberta Selvaggi
Keyword(s):  
Photocatalytic Degradation ◽  
Ammonia Concentration ◽  
Water Solutions ◽  
High Ammonia
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