Results 171 to 180 of about 18,468 (228)
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Electrochemical detection of dipeptides and dipeptide amides
Journal of Chromatography A, 1990A postcolumn reagent is used to create electroactive species from non-electroactive peptides. The reagent, based on the classical biuret reagent, consists of Cu(II), tartrate, bicarbonate and base. The detection is by dual electrode electrochemical detection. N-Acetylated dipeptides are oxidized at pH 12 and low potential.
H Y, Tsai, S G, Weber
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Dipeptides as Microporous Materials
Angewandte Chemie International Edition, 2004The synthesis and characterization of hydrophobic porous frameworks designed for a variety of applications has attracted significant research efforts over the last few years. The key idea in such studies is to design building elements which allow for controllable assembly and disassembly, and which may be extensively replaced and modified to give ...
Soldatov, Dmitriy V. +2 more
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Biochemical and Biophysical Research Communications, 1994
The surprising change of selectivity induced by the change of chirality in peptides containing the tetrahydro-3-isoquinoline carboxylic acid (Tic) in second position, interpreted as a conformational preference induced on the Tyr-Xaa-Phe domain, can instead be attributed to the Tyr-Tic message domain.
P. A. TEMUSSI +8 more
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The surprising change of selectivity induced by the change of chirality in peptides containing the tetrahydro-3-isoquinoline carboxylic acid (Tic) in second position, interpreted as a conformational preference induced on the Tyr-Xaa-Phe domain, can instead be attributed to the Tyr-Tic message domain.
P. A. TEMUSSI +8 more
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Determination of dipeptides in urine
Clinica Chimica Acta, 1974Abstract The urine of a patient suffering from dermatological purpura was examined for dipeptides by combined gas chromatography—mass spectrometry. Several dipeptides were identified and all were of the general formula, R proline, where R is one of the amino acids, glycine, alanine, leucine, isoleucine, valine, phenylalanine, glutamic acid, aspartic ...
R A, Johnstone +5 more
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Biopolymers, 1969
AbstractThe amide bond in L,L‐ and L,D‐α‐chloropropionylalanine methyl ester is shown to be trans by molar polarization and infrared spectroscopy. In these dipeptide diastereoisomer analogues, therefore, differences in physical properties, i.e., melting points, crystalline forms, gas chromatographic mobilities, etc., depend on preferred molecular ...
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AbstractThe amide bond in L,L‐ and L,D‐α‐chloropropionylalanine methyl ester is shown to be trans by molar polarization and infrared spectroscopy. In these dipeptide diastereoisomer analogues, therefore, differences in physical properties, i.e., melting points, crystalline forms, gas chromatographic mobilities, etc., depend on preferred molecular ...
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A silaproline-containing dipeptide
Acta Crystallographica Section C Crystal Structure Communications, 2000The silaproline-containing dipeptide N-(3, 3-dimethyl-1-pivaloyl-1-aza-3-sila-5-cyclopentylcarbonyl)-L- alanine isopropylamide, C(17)H(33)N(3)O(3)Si, has two independent molecules in the asymmetric unit and each adopts a beta-II folded conformation, where the amide on the terminal C interacts intramolecularly with the pivaloyl O atom. The five-membered
B, Vivet +5 more
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Related dipeptide and characteristic dipeptide of optimal pH in α-amylase
Biochemical and Biophysical Research Communications, 2002Alpha-amylase is an enzyme of great significance to industry, but most alpha-amylases are unstable at lower pH. In this paper, we have studied the related dipeptide and characteristic dipeptide of optimal pH in alpha-amylase. On analysis, it gives the explicit results as follows: (1) Ten dipeptides are associated with alpha-amylase's optimal pH. AH, DV,
Ge-Xin, Zhang, Wei-Jiang, Li
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The effect of dipeptide structure on dipeptide and amino acid clearance in rats
Metabolism, 1994The kinetics of disappearance from the blood of GlyTyr, TyrArg, AlaTyr, TyrAla, GlnGly, GlyGln, GlnAla, and AlaGln and their constituent amino acids was assessed in anesthetized (pentabarbitone) Sprague-Dawley rats (n = 5 for each peptide). Catheters were inserted into both internal jugular veins.
A J, Kee +4 more
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Regulation of AChE by a dipeptide
Trends in Pharmacological Sciences, 1989On the basis of an exciting series of experiments, George Koelle (TPS, September 1988)’ puts forward a hypothesis for the mechanism of neurotrophic regulation of acetylcholinesterase in the mammalian sympathetic ganglion by glycyl-Lglutamine (Gly-Gin), a dipeptide that is naturally derived from the post-~~slation~ processing of l3-endorphin*.
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