Topic
Sodium sulfide
About: Sodium sulfide is a research topic. Over the lifetime, 2851 publications have been published within this topic receiving 27733 citations. The topic is also known as: disodium sulfide.
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TL;DR: The addition of sodium sulfide to disulfide-containing proteins dissolved in 0.01 N NaOH produces an absorption in the range of 320–350 nm similar to that exhibited by cystine or cystamine treated under the same conditions.
Abstract: The addition of sodium sulfide to disulfide-containing proteins dissolved in 0.01 N NaOH produces an absorption in the range of 320–350 nm similar to that exhibited by cystine or cystamine treated under the same conditions. Proteins free of cystine and cysteine and proteins containing disulfide bonds which have been reduced with sodium borohydride do not produce this absorbance. Urea and guanidine at 6 M concentration increase the rate of production of the absorbance while sodium dodecyl sulfate at concentration of 0.02 M has an inhibitory effect both on the rate and the extent of the absorbance. The effect of pH, concentration of reagents and of the additions of cyanide and hypotaurine has been studied. The 320–350 nm absorbance as been related to the production of persulfide groups (R-SSH) as a result of the cleavage of disulfide bonds by sulfide. Attempts to prepare a purified model protein containing persulfide groups have failed owing to the instability of the persulfide group in conditions far from those used for its preparation.
89 citations
TL;DR: In this article, a scheme for the mechanism of hydrosulfide ions catalytic oxidation was proposed, and a chain-radical reaction initiated on the surface of colloidal CuS nanoparticles and propagating further in the bulk of a solution.
Abstract: Photophysical characteristics of colloidal CuS nanoparticles synthesized in various conditions and stabilized in aqueous solutions with sodium polyphosphate (SPP) were studied. A correlation between the band gap of CuS nanoparticles and their average diameter was established. Catalytic activity of colloidal CuS nanoparticles in sodium sulfide air oxidation in aqueous solutions at atmospheric pressure and room temperatures was established and thoroughly investigated. Kinetics of HS − oxidation and the nature of principal products of this reaction (thiosulfate and sulfate ions) were elucidated. A scheme for the mechanism of hydrosulfide ions catalytic oxidation was proposed. Accordingly to the scheme, HS − oxidation is a chain-radical reaction initiated on the surface of CuS nanoparticles and propagating further in the bulk of a solution.
89 citations
TL;DR: A sensitive and reliable method was developed for the determination of hydrogen sulfide and acid-labile sulfur (ALS) in animal tissues using gas chromatography with flame photometric detector (GC-FPD) and ion chromatography (IC).
88 citations
TL;DR: An efficient aqueous synthesis of thioamides through aldehydes, sodium sulfide, and N-substituted formamides has been developed and the late-stage modification of bioactive molecules and derivatives through this protocol has been established.
86 citations
TL;DR: Long term leachability tests under ambient conditions at pH 7 showed the produced precipitate to be essentially insoluble, and the removal/precipitation of selenium with sodium sulfide from initially weakly acidic sulfate solutions containing 300 mg/L of Selenium(IV) at 23 °C was studied.
86 citations