111-56-8Relevant academic research and scientific papers
Adsorption of Metal Ions to Surface-Template Resins Prepared with Amphiphilic Styrene Monomers Bearing Amino Carboxylic Acid
Koide, Yoshifumi,Tsujimoto, Keigo,Shosenji, Hideto,Maeda, Mizuo,Takagi, Makoto
, p. 789 - 796 (1998)
Monomer-type functional surfactants, 2-(p-vinylbenzylamino)alkanoic acid (RnAc) and N,N-dialkyl derivatives (RRnNAc), have been used as both a ligand and an emulsifier for the preparation of surface-template resins. The surfactants adsorbed at the toluene-water interface and emulsified divinylbenzene-styrene in a Cu2+ or Zn2+ solution. Emulsion polymerization using a K2S2O8 initiator (80 °C) or by irradiation with γ-rays gave fine particles of 200-800 nm in diameter. Metal-imprinted resins prepared with RnNAc and RRnNAc showed a high adsorptive capacity for the metal ion (surface-template effect). Cu-imprinted resins prepared with R8NAc were 2.69-times as effective for Cu2+ in competitive sorption from a Cu2+-Zn2+ mixture and Zn-imprinted resins were 1.84-times as effective for Zn2+, compared with unimprinted resins. Because of the great emulsifying power, metal-imprinted resins prepared with R8NAc showed the most metal-selective adsorption and the largest capacity among resins prepared with RnNAc and RRnNAc.
Synthesis and Surface-Active Properties of a Homologous Series of Star-Like Triple-Chain Anionic Surfactants Derived from 1,1,1-Tris(hydroxymethyl)ethane
Li, Xu,Xing, Fenglan,Xu, Qun,Sun, Xiaolong,Wang, Yuping,Wang, Liyan,Wang, Pinglang
, p. 129 - 135 (2016/01/09)
A novel homologous series of trimeric anionic surfactants, 3C n TE3CNa (where n is a fatty acid chain length of 7, 10, or 12), with three hydrocarbon chains and three carboxylate heads connected via tri-etheric bonds were synthesized from long-chain α-bromo fatty acids and a triol, 1,1,1-tris(hydroxymethyl)ethane. The obtained trimeric carboxylic acids were esterified and purified by silica gel column chromatography, then hydrolyzed with dilute sodium hydroxide solution to form a series of trimeric carboxylate surfactant products. All prepared compounds were analyzed by IR, 1H NMR, and 13C NMR spectroscopy to confirm their chemical structures. Their surface-active properties were investigated. The critical micelle concentrations (cmc) of 3C n TE3CNa were in the range of 0.12-0.71 mmol/L, and the surface tensions at the cmc (γ cmc) were 29.3-34.8 mN/m.
Synthesis and biological evaluation of novel N-α-haloacylated homoserine lactones as quorum sensing modulators
Syrpas, Michail,Ruysbergh, Ewout,Stevens, Christian V.,De Kimpe, Norbert,Mangelinckx, Sven
, p. 2539 - 2549 (2015/02/19)
Novel N-α-haloacylated homoserine lactones, in which a halogen atom was introduced at the α-position of the carbonyl function of the N - acyl chain, have been studied as quorum sensing (QS) modulators and compared with a library of natural N - acylated homoserine lactones (AHLs). The series of novel analogues consists of α-chloro, α-bromo and α-iodo AHL analogues. Furthermore, the biological QS activity of the synthetic AHL analogues compared to the natural AHLs was evaluated. Halogenated analogues demonstrated a reduced activity in the Escherichia coli JB523 bioassay, with the α-iodo lactones being the less active ones and the α-chloro AHLs the most potent QS agonists. Most of the α-haloacylated analogues did not exhibit a significant reduction when tested in the QS inhibition test. Therefore, these novel analogues could be utilized as chemical probes for QS structure-activity studies.
Long-chain acyl-homoserine lactones from Methylobacterium mesophilicum: Synthesis and absolute configuration
Pomini, Armando M.,Cruz, Pedro L. R.,Gai, Claudia,Araujo, Welington L.,Marsaioli, Anita J.
supporting information; experimental part, p. 2125 - 2129 (2010/04/05)
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.
Mesoionic 5-alkyl-1,3-dithiolium-4-thiolates: Synthesis and brine shrimp toxicity
De Almeida, Paulo Afonso,Da Silva, Tania Maria Sarmento,Echevarria, Aurea
, p. 593 - 600 (2007/10/03)
A series of twelve 1,3-dithiolium-4-thiolate mesoionic compounds were synthesized and characterized. The synthetical approach starting from α-bromoalkanoic acids to obtain the corresponding 2-N-morpholino-dithiocarbamoyl-carboxylic acids that by on-pot reaction with carbon disulfide and acetic anhydride in triethylamine formed not isolate intermediates, 1,3-dithiolium-4-olates. After, the 2-N-morpholino-5-alkyl-1,3-dithiolium-4-thiolates were obtained by retro 1,3-dipolar addition reactions. The alkyl moiety linked to C-5 of heterocyclic ring permitted the increase of the hydrophobic character and this effect was evaluated on Artemia salina lethality. The results indicated a bell-shaped relationship between the number of carbon of side chain in mesoionic derivatives and LD50 in brine shrimp toxicity assays.
Synthesis and Application of Long-Chain Carboxylate Crown-Ether Ionophores for Transport of Metal Cations
Jane, Yih-Song,Shih, Jeng-Shong
, p. 719 - 728 (2007/10/03)
Alkyl-substituted sym-dibenzo-16-crown-5-oxyacetic acid and sym-dibenzo-16-crown-5-oxydodecanic acid were synthesized and applied as ion transport carriers in liquid and film membranes.Increasing crown-ether lipophilicity decreased acid dissociation constants and solubilities of crown-ether carboxylic acids in water but enhanced the solubility and transport ability of the carboxylic anion-K+ complex through a liquid organic (CH2Cl2) membrane.Transport phenomena of the cations alkali-metal ions, alkaline-earth metal ions and transition-metal ions through liquid membranes based on these crown-ether carriers were investigated.Effects of anions, crown-ethers and pH on ion transport are discussed.A mechanism of ion transport through a crown-ether membrane is proposed to include -> and +> in both source and target layers.Ion transport through a polymer/crown-ether film membrane was more efficient than through a liquid membrane. - Key Words: Crown ethers; Ion Transport; Metal Ion; Liquid Membrane; Carrier; Polymer film membrane; Ionophore.
Syntheses of 2-(2-Hydroxyethylamino) Fatty Acids
Xianxian, Du
, p. 123 - 124 (2007/10/02)
Eight 2-(2-hydroxyethylamino) fatty acids, 2-(2-hydroxyethylamino)decanoic, -undecanoic, -dodecanoic, -tetradecanoic, -hexadecanoic, -octadecanoic, -nonadecanoic, and docosanoic acid, were synthesized by reacting 2-bromo fatty acids with more than 3 mol of 2-aminoethanol.The surface tension and the critical micelle concentration were determined for these compounds.
