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N-acethyl cysteine

Roberto Biondi, Stefano Brancorsini, Giulia Poli, Maria Giulia Egidi, Enrico Capodicasa, Livio Bottiglieri, Sandro Gerli, Eleonora Brillo, Gian Carlo Di Renzo, Dragos Cretoiu, Romeo Micu, Nicolae Suciu
Hydroxyl radical (.OH) is highly reactive, and therefore very short-lived. Finding new means to accurately detect .OH, and testing the ability of known .OH scavengers to neutralize them in human biological fluids would leverage our ability to more effectively counter oxidative (.OH) stress-mediated damage in human diseases. To achieve this, we pursued the evaluation of secondary products resulting from .OH attack, using a detection system based on Fenton reaction-mediated D-phenylalanine (D-Phe) hydroxylation...
May 1, 2018: Talanta
Yuta Mutaguchi, Taketo Ohmori, Hirofumi Akano, Katsumi Doi, Toshihisa Ohshima
Levels of free D-amino acids were compared in 11 vinegars produced from different sources or through different manufacturing processes. To analyze the D- and L-amino acids, the enantiomers were initially converted into diastereomers using pre-column derivatization with o-phthaldialdehyde plus N-acethyl-L-cysteine or N-tert-butyloxycarbonyl-L-cysteine. This was followed by separation of the resultant fluorescent isoindol derivatives on an octadecylsilyl stationary phase using ultra-performance liquid chromatography...
2013: SpringerPlus
Ricardo M Heguilén, Amador A Liste, Miguel Payaslian, Martin Gabriel Ortemberg, Lautaro Martin Albarracín, Amelia Rita Bernasconi
BACKGROUND: The occurrence of contrast-induced acute kidney injury (CIAKI) has paralleled the increased number of diagnostic interventions requiring radiographic contrast media (CM). Several strategies aimed at preventing renal injury following iodine have been carried out over the last several years. The aim of this study was to evaluate the impact of three different strategies aimed at preventing CIAKI in patients with renal dysfunction (serum creatinine >1.25 mg/dl or estimated creatinine clearance <45 ml/min) receiving low osmolar CM for diagnostic-therapeutic procedures...
June 2013: Clinical and Experimental Nephrology
Bojidarka Koleva, Michael Spiteller, Tsonko Kolev
Method of linear polarized vibrational (both IR- and Raman) spectroscopy of oriented colloids in nematic host is applied on N-acetyl-L-cysteine, L-cysteine, L-cystine and L-ascorbic acid with a view to obtain experimental bands assignment and local structural elucidation in solid-state. Structural results are compared with available crystallographic data for all of the systems studied. Scopes and limitations of the polarized method are shown. Discussion on the correlation between polarized spectroscopic data and the space group type as well as the number of the molecules in the unit cell (Z) is performed...
January 2010: Amino Acids
C Cháfer-Pericás, R Herráez-Hernández, P Campíns-Falcó
A new method is presented for the determination of DMA in water as its 9-fluorenylmethyl chloroformate (FMOC) derivative using solid-phase microextraction (SPME) and liquid chromatography. The method is based on the employment of SPME fibres coated with carbowax-templated resin (CW-TR) for analyte extraction and derivatization. The fibres were successively immersed in the samples, in a solution of o-phthalaldialdehyde and N-acethyl-l-cysteine (OPA-NAC) and finally, in a solution of FMOC. OPA-NAC reacted on the fibre with possible primary aliphatic amines present in the samples, particularly with PA which is a direct interferent in the determination of DMA with FMOC...
June 15, 2005: Talanta
K K Cruz, S G Fonseca, M C Monteiro, O S Silva, V M Andrade, F Q Cunha, P R T Romão
Glutathione (GSH) has an important dual role in parasite-host relationship in Leishmania major infection. Our previous studies showed that both antioxidant systems, glutathione and trypanothione/trypanothione reductase, participate in the protection of Leishmania against the toxic effect of nitrogen-derived reactive species. On the other hand, GSH also is very important to the modulation of the effective immune response, inducting NO production and leishmanicidal activity of macrophages. In the present study, we investigated the role of host GSH during the course of L...
March 2008: Parasite Immunology
M A Murina, D I Roshchupkin, N S Belakina, S V Filippov
The effect of some scavengers of thiol nature, which eliminate all reactive oxygen species and oxidants with reactive chlorine, on the luminol-enhanced chemiluminescence of polymorphonuclear leukocytes was studied. The use of two scavengers of this type (penetrating and not penetrating into the cell) made it possible to separate the luminescence of cell structures from the luminescence generated by oxidants in the surrounding medium. It was found that about a half of luminol luminescence is due to its oxidation in the medium surrounding the cell, and it is completely inhibited by the nonpenetrating reduced glutathione...
November 2005: Biofizika
D Baba, H Ishii, S Higashiya, K Fujisawa, T Fuchigami
Anodic fluorination of N-benzoyl, N-acethyl-, and N-formylthiazolidine derived from L-cysteine was carried out in dimethoxyethane (DME) and acetonitrile containing various supporting fluoride salts using an undivided cell. Highly regioselective fluorination proceeded to provide the corresponding 5-monofluorinated thiazolidine derivatives in good yields in DME, and the diastereoselectivitiy was moderate to high regardless of the supporting fluoride salts. The diastereoselectivitiy of the fluorination was greatly affected by the bulkyness of the subsitituent on the nitrogen atom, and N-benzoylthiazolidine gave much higher diastereoselectivity compared with N-formyl derivative...
October 19, 2001: Journal of Organic Chemistry
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