154-92-7Relevant articles and documents
Study the effect of trypsin enzyme activity on the screening of applying frontal affinity chromatography
Qian, JunQing,Zhao, ChangYan,Tong, Jun,Jiang, ShengLan,Zhang,Lu, ShiYong,Guo, Hui
, p. 740 - 751 (2019)
Frontal affinity chromatography (FAC) combined with enzyme has been widely used for drug screening. In this paper, the effect of target enzyme activity on screening of bioactive compounds was studied through applying FAC. Trypsin with different degree of inactivation were prepared as target enzyme by thermal denaturation. Their primary structure was identified by sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) and use Fourier transform infrared (FTIR) and ultraviolet-visible (UV–vis) spectroscopy to detect group structure. Ultimately, it was found that the main structure of enzyme with decreased activity remained unchanged. The oxymatrine and matrine which can interact with trypsin were selected to study their binding to trypsin with different activities in FAC. The results showed that oxymatrine and matrine had a significant difference in the breakthrough volume among seven kinds of columns prepared by trypsins with different activities, at the different concentration. It indicated that trypsins with different activities in FAC could combine with oxymatrine and matrine. The binding constant (Kd) variation between oxymatrine, matrine and trypsin with different activities are 5.520 ± 0.038 and 3.577 ± 0.071, within error range, which indicated that the activity of target enzyme with primary unchanged structure has no effect on screening of bioactive components by FAC.
Biocatalytic synthesis, antimicrobial properties and toxicity studies of arginine derivative surfactants
Fait, M. Elisa,Garrote, Graciela L.,Clapés, Pere,Tanco, Sebastian,Lorenzo, Julia,Morcelle, Susana R.
, p. 1465 - 1477 (2015)
Abstract Two novel arginine-based cationic surfactants were synthesized using as biocatalyst papain, an endopeptidase from Carica papaya latex, adsorbed onto polyamide. The classical substrate N α-benzoyl-arginine ethyl ester hydrochloride for the determination of cysteine and serine proteases activity was used as the arginine donor, whereas decyl- and dodecylamine were used as nucleophiles for the condensation reaction. Yields higher than 90 and 80 % were achieved for the synthesis of N α-benzoyl-arginine decyl amide (Bz-Arg-NHC10) and N α-benzoyl-arginine dodecyl amide (Bz-Arg-NHC12), respectively. The purification process was developed in order to make it more sustainable, by using water and ethanol as the main separation solvents in a single cationic exchange chromatographic separation step. Bz-Arg-NHC10 and Bz-Arg-NHC12 proved antimicrobial activity against both Gram-positive and Gram-negative bacteria, revealing their potential use as effective disinfectants as they reduced 99 % the initial bacterial population after only 1 h of contact. The cytotoxic effect towards different cell types of both arginine derivatives was also measured. Bz-Arg-NHCn demonstrated lower haemolytic activity and were less eye-irritating than the commercial cationic surfactant cetrimide. A similar trend could also be observed when cytotoxicity was tested on hepatocytes and fibroblast cell lines: both arginine derivatives were less toxic than cetrimide. All these properties would make the two novel arginine compounds a promising alternative to commercial cationic surfactants, especially for their use as additives in topical formulations.
Time-resolved dynamic nuclear polarization enhanced NMR spectroscopy
Bowen, Sean,Hilty, Christian
, p. 5235 - 5237 (2008)
(Chemical Presented) The sensitive touch: Sensitivity constraints in NMR spectroscopy typically call for long measurement times. Hyperpolarization can enhance the time resolution of NMR spectroscopy by removing the need for signal averaging. Reactions such as enzyme catalysis can be followed in real time by hyperpolarized NMR spectroscopy through reduction in the intensity of the substrate resonance as well as the appearance of product resonances (see picture).
Synthetic approaches to a challenging and unusual structure—an amino-pyrrolidine guanine core
Rippel, Rafael,Pinheiro, Luís,Lopes, Mónica,Louren?o, Ana,Ferreira, Luísa M.,Branco, Paula S.
, (2020/02/25)
The synthesis of an unreported 2-aminopyrrolidine-1-carboxamidine unit is here described for the first time. This unusual and promising structure was attained through the oxidative decarboxylation of amino acids using the pair of reagents, silver(I)/peroxydisulfate (Ag(I)/S2O82?) followed by intermolecular (in the case of L-proline derivative) and intramolecular trapping (in the case of acyl L-arginine) by N-nucleophiles. The L-proline approach has a broader scope for the synthesis of 2-aminopyrrolidine-1-carboxamidine derivatives, whereas the intramolecular cyclization afforded by the L-acylarginines, when applied, results in higher yields. The former allowed the first synthesis of cernumidine, a natural alkaloid isolated in 2011 from Solanum cernuum Vell, as its racemic form.
