Screening and characterization of a novel reversible 4-hydroxyisophthalic acid decarboxylase from Cystobasidium slooffiae HTK3

2021 ◽  
Author(s):  
Riku Aono ◽  
Tomoya Yoshihara ◽  
Hotaka Nishida ◽  
Kuniki Kino
Keyword(s):  
Carboxylic Acids ◽  
Building Block ◽  
Acid Production ◽  
Dicarboxylic Acids ◽  
Acid Decarboxylase ◽  
Hydroxybenzoic Acid ◽  
Monocarboxylic Acids ◽  
Aromatic Dicarboxylic Acids

Abstract Owing to carboxylation activity, reversible decarboxylases can use CO2 as a C1-building block to produce useful carboxylic acids. Although many reversible decarboxylases can synthesize aromatic monocarboxylic acids, only a few reversible decarboxylases have been reported to date that catalyze the synthesis of aromatic dicarboxylic acids. In the present study, a reversible 4-hydroxyisophthalic acid decarboxylase was identified in Cystobasidium slooffiae HTK3. Furthermore, recombinant 4-hydroxyisophthalic acid decarboxylase was prepared, characterized, and used for 4-hydroxyisophthalic acid production from 4-hydroxybenzoic acid.

Synthesis and characterization of new cardo poly(ether amide)s containing 9(10H)-anthrone units

2020 ◽  
Vol 32 (9) ◽  
pp. 1001-1009
Author(s):  
Yi-Sheng Luo ◽  
Qiu-Ying Wang ◽  
Xue-Chun Mao ◽  
Shou-Ri Sheng
Keyword(s):  
Room Temperature ◽  
Dicarboxylic Acids ◽  
Synthesis And Characterization ◽  
Aromatic Diamine ◽  
Polar Solvents ◽  
Glass Transition Temperatures ◽  
Flexible Films ◽  
Step Procedure ◽  
Aromatic Dicarboxylic Acids

A new aromatic diamine, 10,10-bis[4-(4-aminophenoxy)phenyl]-9(10 H)-anthrone (BAPA) has been synthesized from anthrone via three-step procedure. Direct phosphorylation polycondensation of BAPA with various aromatic dicarboxylic acids produced a series of cardo poly(ether amide)s with inherent viscosities of 0.97–1.29 dL g−1. All the polymers were readily soluble in polar solvents such as N-methyl-2-pyrrolidone, N, N-dimethylacetamide (DMAc), and pyridine at room temperature, and afforded transparent, strong, and flexible films upon casting from DMAc solvent. The resulting poly(ether amide)s had glass transition temperatures of 254–316°C, 10% weight loss temperatures of 495–524°C, and char yields of 55–70% at 800°C in nitrogen. These polymers were amorphous and their films exhibited tensile strengths of 81.6–104.7 MPa, tensile moduli of 1.8–2.4 GPa, and elongations at break of 8–15%.

scholarly journals Historic records of organic compounds from a high Alpine glacier: influences of biomass burning, anthropogenic emissions, and dust transport

2016 ◽  
Vol 16 (2) ◽  
pp. 1029-1043 ◽  
Author(s):  
C. Müller-Tautges ◽  
A. Eichler ◽  
M. Schwikowski ◽  
G. B. Pezzatti ◽  
M. Conedera ◽  
...  
Keyword(s):  
Carboxylic Acids ◽  
Organic Compounds ◽  
Ice Core ◽  
Dicarboxylic Acids ◽  
Anthropogenic Emissions ◽  
Hydroxybenzoic Acid ◽  
Dust Transport ◽  
Highly Correlated ◽  
Pinic Acid

Abstract. Historic records of α-dicarbonyls (glyoxal, methylglyoxal), carboxylic acids (C6–C12 dicarboxylic acids, pinic acid, p-hydroxybenzoic acid, phthalic acid, 4-methylphthalic acid), and ions (oxalate, formate, calcium) were determined with annual resolution in an ice core from Grenzgletscher in the southern Swiss Alps, covering the time period from 1942 to 1993. Chemical analysis of the organic compounds was conducted using ultra-high-performance liquid chromatography (UHPLC) coupled to electrospray ionization high-resolution mass spectrometry (ESI-HRMS) for dicarbonyls and long-chain carboxylic acids and ion chromatography for short-chain carboxylates. Long-term records of the carboxylic acids and dicarbonyls, as well as their source apportionment, are reported for western Europe. This is the first study comprising long-term trends of dicarbonyls and long-chain dicarboxylic acids (C6–C12) in Alpine precipitation. Source assignment of the organic species present in the ice core was performed using principal component analysis. Our results suggest biomass burning, anthropogenic emissions, and transport of mineral dust to be the main parameters influencing the concentration of organic compounds. Ice core records of several highly correlated compounds (e.g., p-hydroxybenzoic acid, pinic acid, pimelic, and suberic acids) can be related to the forest fire history in southern Switzerland. P-hydroxybenzoic acid was found to be the best organic fire tracer in the study area, revealing the highest correlation with the burned area from fires. Historical records of methylglyoxal, phthalic acid, and dicarboxylic acids adipic acid, sebacic acid, and dodecanedioic acid are comparable with that of anthropogenic emissions of volatile organic compounds (VOCs). The small organic acids, oxalic acid and formic acid, are both highly correlated with calcium, suggesting their records to be affected by changing mineral dust transport to the drilling site.

Methods for the Synthesis of Polyethereketone

2018 ◽  
Vol 935 ◽  
pp. 27-30
Author(s):  
K.T. Shakhmurzova ◽  
Zh.I. Kurdanova ◽  
Arthur E. Baikaziev ◽  
Karina Kh. Teunova ◽  
Azamat A. Zhansitov ◽  
...  
Keyword(s):  
Molecular Weight ◽  
Aromatic Hydrocarbons ◽  
Electrophilic Substitution ◽  
Methylene Chloride ◽  
Dicarboxylic Acids ◽  
Polynuclear Aromatic Hydrocarbons ◽  
Low Molecular Weight ◽  
Monocarboxylic Acids ◽  
Synthesis Time ◽  
Aromatic Dicarboxylic Acids

The data on the methods for the preparation of polyetherketones by electrophilic and nucleophilic methods are considered and generalized. It is shown that polyetherketones by electrophilic substitution are carried out as homopolycondensation aromatic monocarboxylic acids and their halides and polycondensation of polynuclear aromatic hydrocarbons with aromatic dicarboxylic acids or their halides, and phosgene in organic solvents (1,2-dichloroethane, methylene chloride, nitrobenzene and etc.) in the presence of Ziegler-Natt catalysts. However, this process has not found an industrial application in view of such disadvantages as low yield of the desired product, the formation of a polymer with low molecular weight, synthesis time (15-40 hours), the use of large amounts of catalyst, the complexity of polymer purification of it.

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