A common synthesis route for PEEK is the reaction between 4,40-difluoro benzophenone and the disodium salt of hydroquinone in a polar solvent such as diphenyl sulphone
at 300 8C.
The reactive dyes are by far the surest and safest option for cotton clothing but research is supportive of producing new products with Vinyl Sulphone
chemistry than to counterpart of reactive dyes based on reactive groups consisting of Chlorine and Florine, AOX compounds.
Li, "A novel all-purpose epoxy-terminated hyperbranched polyether sulphone
toughener for an epoxy/amine system," Polymer, vol.
Cystine and methionine were measured as cysteic acid and methionine sulphone
, respectively, by performic acid oxidation before hydrolysis with 6 N-HCl .
The dietary levels of methionine and cystine were estimated with the use of the Biochrom 20 plus amino acid analyzer, Biochrom amino acid analysis reagents (Biochrom Ltd., Cambridge, England), and the following standards for amino acid analysis offered by Sigma-Aldrich: Amino Acid Standard Solution (AASS-18), L-methionine sulphone
, L-cysteic acid.
Methionine and cysteine were determined as methionine sulphone
and cysteic acid using an AA Analyzer (Hitachi L-8900, Japan) after cold performic acid oxidation overnight and hydrolyzing with 7.5 N HCl at 110[degrees]C for 24 h.
The sulfur aminoacids such as Met and Cys are highly susceptible to oxidation in the presence of oxidized lipid products which lead to the formation of a variety of compounds such as sulphone
, sulfoxides, and disulfide derivatives .
The crude extract was obtained by centrifugation and sequential filtrations through Whatman paper Number 42 and 0.45 and 0.22 [micro]m polyether sulphone
membranes (Pall Corp, Port Washington, NY, USA).
Dye Class 1 Acid red 27 Monoazo sulphone
2 Acid blue 74 Indigoid 3 Acid red 2(MR) ** Acid monoazo 4 Acid red 52 Acid sulphone
monoazo 5 Acid orange 7 Vinylsulphone monoazo 6 Acid black 210 Vinyl sulphone
triazo 7 Direct yellow 12 Diazo sulphone
8 Reactive red 195 Diazo sulphone
9 Reactive black 5 Vinyl sulphone
diazo 10 Reactive yellow 145 Monoazo sulphone
Dapsone (4, 4'-diamino-diphenyl sulfone, DDS) is a sulphone