Long-Chain Acyl-Homoserine Lactones from Methylobacterium mesophilicum: Synthesis and Absolute Configuration
摘要:
The acyl-homoserine lactones (acyl-HSLs) produced by Methylobacterium mesophilicum isolated from orange trees infected with the citrus variegated chlorosis (CVC) disease have been studied, revealing the occurrence of six long-chain acyl-HSLs, i.e., the saturated homologues (S)-N-dodecanoyl (1) and (S)-N-tetradecanoyl-HSL (5), the uncommon odd-chain N-tridecanoyl-HSL (3), the new natural product (S)-N-(2E)-dodecenoyl-HSL (2), and the rare unsaturated homologues (S)-N-(7Z)-tetradecenoyl (4) and (S)-N-(2E,7Z)-tetradecadienyl-HSL (6). The absolute configurations of all HSLs were determined as 3S. Compounds 2 and 6 were synthesized for the first time. Antimicrobial assays with synthetic acyl-HSLs against Gram-positive bacterial endophytes co-isolated with M. mesophilicum from CVC-infected trees revealed low or no antibacterial activity.
Long-Chain Acyl-Homoserine Lactones from Methylobacterium mesophilicum: Synthesis and Absolute Configuration
摘要:
The acyl-homoserine lactones (acyl-HSLs) produced by Methylobacterium mesophilicum isolated from orange trees infected with the citrus variegated chlorosis (CVC) disease have been studied, revealing the occurrence of six long-chain acyl-HSLs, i.e., the saturated homologues (S)-N-dodecanoyl (1) and (S)-N-tetradecanoyl-HSL (5), the uncommon odd-chain N-tridecanoyl-HSL (3), the new natural product (S)-N-(2E)-dodecenoyl-HSL (2), and the rare unsaturated homologues (S)-N-(7Z)-tetradecenoyl (4) and (S)-N-(2E,7Z)-tetradecadienyl-HSL (6). The absolute configurations of all HSLs were determined as 3S. Compounds 2 and 6 were synthesized for the first time. Antimicrobial assays with synthetic acyl-HSLs against Gram-positive bacterial endophytes co-isolated with M. mesophilicum from CVC-infected trees revealed low or no antibacterial activity.
Synthesis and biological evaluation of novel <i>N</i>-α-haloacylated homoserine lactones as quorum sensing modulators
作者:Michail Syrpas、Ewout Ruysbergh、Christian V Stevens、Norbert De Kimpe、Sven Mangelinckx
DOI:10.3762/bjoc.10.265
日期:——
N-alpha-haloacylated homoserine lactones, in which a halogen atom was introduced at the alpha-position of the carbonyl function of the N-acyl chain, have been studied as quorumsensing (QS) modulators and compared with a library of natural N-acylated homoserine lactones (AHLs). The series of novel analogues consists of alpha-chloro, alpha-bromo and alpha-iodo AHL analogues. Furthermore, the biological QS activity of
Cosmetic Compositions Containing Esters Based on 2-Propylheptanol
申请人:Cognis IP Management GmbH
公开号:US20140121394A1
公开(公告)日:2014-05-01
Esters of 2-propylheptanol with linear or branched, saturated or unsaturated C
5
-C
36
carboxylic acids and C
4
-C
36
dicarboxylic acids, compositions comprising these esters, and to the use of esters of 2-propylheptanol with linear or branched, saturated or unsaturated C
5
-C
35
-carboxylic acids and/or C
4
-C
36
-dicarboxylic acids in cosmetic and/or topical pharmaceutical preparations.
.alpha.-Iodination of some aliphatic acids. Substituent effect and optimum conditions
作者:Yoshiro Ogata、Shinya Watanabe
DOI:10.1021/jo01302a016
日期:1980.7
SYSTEM AND METHOD FOR VISUALIZING CHEMICAL REACTIONS IN REAL TIME
申请人:Maye Mathew
公开号:US20180284086A1
公开(公告)日:2018-10-04
A nanoparticle based assay for monitoring chemical reactions in real-time, ion concentrations in solution, and oxidation potential of ions in solution is describe. The assay is based on use of photoluminescent perovskite nanoparticles with the composition XYZ
3
. The XYZ
3
nanoparticles are added to a reaction or a solution to be analyzed, and the optoelectronic response of the nanoparticle is proportional to the chemical kinetics of the reaction or concentration of target. The resulting color changes can be qualitatively monitored by eye or quantitatively by spectroscopy. The assays may serve as a compliment or replacement for routine chemical analysis performed over the course of a reaction.