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M Prudel et al.
Die Nahrung, 29(4), 381-389 (1985-01-01)
A HPLC method for the determination of Usal (Aspartame hydrochloride, L-aspartyl-L-phenylalanine methyl ester hydrochloride) and its decomposition products was elaborated. Aspartic acid, phenylalanine, phenylalanine methyl ester, aspartyl-phenylalanine, phenylalanyl-aspartic acid, 5-benzyl-3,6-dioxo-2-piperazineacetic acid (DOP) and Usal were separated on Separon SI C-18.
Shengrong Liao et al.
European journal of medicinal chemistry, 83, 236-244 (2014-06-25)
Non-protected 2,5-diketopiperazine derivatives have poor solubility thus with negative impact on their bioavailability. In the present study, twenty-one novel soluble mono-protected, and three non-protected 2,5-diketopiperazine derivatives were designed and synthesized. Their anticancer activity to ten cell lines were evaluated by
J Haginaka et al.
The Journal of pharmacy and pharmacology, 38(3), 225-226 (1986-03-01)
A sensitive, high-performance liquid chromatographic method has been developed for the determination of piperazine-2,5-dione, a new metabolite of ampicillin, in human urine. Piperazine-2,5-dione was separated from human urine on a C18-column using phosphate buffer-methanol (pH 3.5) as eluent. Subsequently, the
R Shukla et al.
Peptides, 15(8), 1471-1474 (1994-01-01)
Central administration of exogenous cyclo(His-Pro) (CHP) is known to produce hypothermia in rodents. In the present study, we examined the role of endogenous CHP in cold-induced hypothermia in the desert rat, Mastomys natalensis. The results of these studies show that
Liyun Zhang et al.
Amino acids, 43(1), 279-287 (2011-09-16)
Cyclic dipeptides, due to their chemical properties and various bioactivities, are very attractive for medicinal chemistry. Fragmentations of three simple cyclic dipeptides including cyclo(Gly-Gly), cyclo(Ala-Ala) and cyclo(Gly-Val) in the gas-phase are determined with synchrotron vacuum ultraviolet (VUV) photoionization mass spectrometry
S Capasso et al.
International journal of peptide and protein research, 45(6), 567-573 (1995-06-01)
The kinetics of the spontaneous formation of 2,5-dioxopiperazines from peptides containing the Tic (1,2,3,4-tetrahydroisoquinoline-3-carboxylic acid) residue in the 2-position of the sequence has been studied in DMSO and water solution. The reaction is first order in Tic-peptide and subject to
Da Wang et al.
Journal of the American Society for Mass Spectrometry, 22(7), 1197-1203 (2011-09-29)
We present infrared multiple photon dissociation (IRMPD) spectra in the hydrogen stretching region of the simplest b fragment, b(2) from protonated triglycine, contrasted to that of protonated cyclo(Gly-Gly). Both spectra confirm the presence of intense, diagnostic vibrations linked to the
A K Szardenings et al.
Journal of medicinal chemistry, 41(13), 2194-2200 (1998-06-19)
The discovery of a novel series of heterocyclic matrix metalloproteinase (MMPs) inhibitors is described. Published crystal structures of peptidyl hydroxamates bound to MMPs were the basis for the rational design of diketopiperazine (DKP) inhibitors. Combinatorial libraries were prepared and evaluated
Yi Sun et al.
Physical chemistry chemical physics : PCCP, 22(1), 107-113 (2019-12-07)
The non-enzymatic cleavage rates of amide bonds located in peptides in aqueous solution is pH-dependent and involves two distinct mechanisms: direct hydrolysis (herein termed "scission") and intramolecular aminolysis by the N-terminal amine (herein termed "backbiting"). While amide bond cleavage has
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