scholarly journals Formations of (5-Hydroxy)indoleS-(–)-lactic Acid,N-Acetyl-5-hydroxy-L-tryptophan, and (5-Hydroxy)indole Carboxylic Acid in the Metabolism of Tryptophan and 5-Hydroxytryptophan byChromobacterium violaceum

1993 ◽  
Vol 57 (9) ◽  
pp. 1609-1610 ◽  
Author(s):  
Tsutomu Hoshino ◽  
Masahiro Yamamoto ◽  
Takeo Uchiyama
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acid ◽  
Indole Carboxylic Acid

THE TRANSMISSION OF POLAR EFFECTS: IV. THE KINETICS OF ESTERIFICATION WITH DIAZODIPHENYLMETHANE OF SUBSTITUTED HETEROCYCLIC CARBOXYLIC ACIDS

1966 ◽  
Vol 44 (13) ◽  
pp. 1493-1499 ◽  
Author(s):  
Keith Bowden ◽  
D. C. Parkin
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Rate Coefficients ◽  
Relative Ability ◽  
Indole Carboxylic Acid ◽  
Kinetics Of ◽  
Electron Effects

The rate coefficients for the reaction with diazodiphenylmethane, in ethanol at 30.0°, of a number of substituted indole-2-carboxylic acids, indole-3-carboxylic acids, coumarin-3-carboxylic acids, coumarilic acids, and N-phenylglycines have been determined. The effect of substitution is assessed by use of adapted Hammett and Dewar–Grisdale relations. The relations give good correlations for oxygen-ring heterocyclic systems, and the relative ability of the systems to transmit π-electron effects has been determined. An anomalous perturbing effect appears to operate in the indole-carboxylic acid systems.

Star-shaped poly(lactic acid) with carboxylic acid terminal groups via poly-condensation

Polymer ◽  
2012 ◽  
Vol 53 (18) ◽  
pp. 3842-3848 ◽  
Author(s):  
Atsushi Abiko ◽  
Shin-ya Yano ◽  
Makoto Iguchi
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acid ◽  
Poly Lactic Acid ◽  
Poly Condensation

Thermal Degradation of Hydroxyl-Terminated Poly(L-Lactic Acid) Oligomer into L-Lactide

2010 ◽  
Vol 152-153 ◽  
pp. 222-228 ◽  
Author(s):  
Jun Shen ◽  
Rong Qing Wei ◽  
Ying Liu ◽  
Xiao Ning Liu ◽  
Yu Zhong
Keyword(s):  
Lactic Acid ◽  
High Temperature ◽  
Carboxylic Acid ◽  
Thermal Degradation ◽  
Adipic Acid ◽  
Degradation Mechanism ◽  
Practical Approach ◽  
Condensation Polymerization ◽  
Speed Up ◽  
Degradation Behaviors

This study investigates the thermal degradation of poly(L-lactic acid) (PLLA) oligomers into L-lactide（LA）by modification of the oligomer terminal groups. Pure PLLA oligomer (OLLA) was synthesized by condensation polymerization of L-lactic acid. Poly-hydroxyl-terminated OLLA (OLLAPOH) and two-carboxylic acid-terminated OLLA (OLLACOOH) were prepared by adding a small amount of polyfunctional substance, such as 1,4-butanediol, pentaerythritol, or adipic acid, to L-lactic acid. The thermal degradation behaviors of these oligomers were compared at 210-220 °C under 0.3-0.5 kPa. The results show that OLLAPOH has a 10-20% higher yield than OLLA and OLLACOOH. The order of decreasing yield is as follows: OLLAPOH>OLLA >OLLACOOH. The hydroxyl ends of the chains induce the reaction. OLLAPOH simultaneously starts depolymerization from each hydroxyl end to speed up the reaction, to shorten the time the substance remains at high temperature, and to reduce the byproducts. This results in an increased L-lactide yield. A practical approach for L-lactide production by thermal degradation of OLLAPOH is adopted by using a degradation mechanism, which is an unzipping reaction beginning from the hydroxyl ends of the chains.

scholarly journals Indole carboxylic acid esters of melampomagnolide B are potent anticancer agents against both hematological and solid tumor cells

2017 ◽  
Vol 136 ◽  
pp. 393-405 ◽  
Author(s):  
Shobanbabu Bommagani ◽  
Jessica Ponder ◽  
Narsimha R. Penthala ◽  
Venumadhav Janganati ◽  
Craig T. Jordan ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Tumor Cells ◽  
Solid Tumor ◽  
Anticancer Agents ◽  
Indole Carboxylic Acid ◽  
Acid Esters

scholarly journals Accumulation of Carboxylic Acids From Glucose by the Pre-Implantation Mouse Embryo

1969 ◽  
Vol 22 (3) ◽  
pp. 701 ◽  
Author(s):  
RG Wales
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Mouse Embryo ◽  
Subsequent Development ◽  
Mouse Embryos ◽  
Partition Chromatography ◽  
Lactate Accumulation ◽  
The One

The accumulation of carboxylic acids from glucose was measured by incubat-ing pre-implantation mouse embryos in [U-14C]glucose and separating the carboxylic acids by liquid-liquid partition chromatography. Lactic acid was the main carboxylic acid accumulated. The one-cell zygote produced five times as much lactate as the unfertilized ovum, and during subsequent development lactate accumulation increased substantially.

Versatile synthesis of comb-shaped poly(lactic acid) copolymers with poly(acrylic acid)-based backbones and carboxylic acid end groups

2017 ◽  
Vol 111 ◽  
pp. 79-87 ◽  
Author(s):  
Pavel Kucharczyk ◽  
Jiri Zednik ◽  
Petr Humpolicek ◽  
Zdenka Capakova ◽  
Vladimir Sedlarik
Keyword(s):  
Lactic Acid ◽  
Carboxylic Acid ◽  
Acrylic Acid ◽  
Poly Lactic Acid ◽  
End Groups ◽  
Poly Acrylic Acid

Antimicrobial Activity of 2-Pyrrolidone-5-Carboxylic Acid Produced by Lactic Acid Bacteria

1997 ◽  
Vol 60 (7) ◽  
pp. 786-794 ◽  
Author(s):  
ZHENNAI YANG ◽  
TARJA SUOMALAINEN ◽  
ANNIKA MÄYRÄ-MÄKINEN ◽  
EINE HUTTUNEN
Keyword(s):  
Antimicrobial Activity ◽  
Lactic Acid ◽  
Carboxylic Acid ◽  
Lactic Acid Bacteria ◽  
Antimicrobial Agent ◽  
Pseudomonas Fluorescens ◽  
Ammonium Hydroxide ◽  
Enterobacter Cloacae ◽  
Spoilage Bacteria

Thirteen Lactobacillus and five Pediococcus strains were shown to produce an antimicrobial agent, 2-pyrrolidone-5-carboxylic acid (PCA). PCA inhibited many spoilage bacteria, particularly Enterobacter cloacae 1575, Pseudomonas fluorescens KJLG, and P. putida 1560-2. The antimicrobial activity of PCA did not change at higher temperatures. However, the activity was destroyed rapidly by neutralization with ammonium hydroxide. PCA showed slightly lower antimicrobial activity than lactic acid.

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