Glyoxal


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glyoxal

[glī′äk‚sal]
(organic chemistry)
(CHO)2 Colorless, deliquescent powder or liquid with mild odor, melting point 15°C, boiling point 51°C; used to insolubilize starches, cellulosic materials, and proteins, in embalming fluids, for leather tanning, and for rayon shrinkproofing.

Glyoxal

 

the simplest dialdehyde, OHC—CHO. In the crystalline and liquid states it is yellow; the vapor is green. Melting point, 15° C; boiling point, 50.4° C; density, 1.4 g/cm3 (20° C); index of refraction nD20.5 1.3826.

Glyoxal is prepared by dehydrogenation of ethylene glycol, HOCH2—CH2OH, over a copper catalyst or by treating tetrachloroethane, Cl2CH—CHCl2, with oleum, followed by hydrolysis of the resultant glyoxal sulfate,

Glyoxal is readily soluble in water, alcohol, and ether; it polymerizes readily during storage, particularly in the presence of traces of water. Polymeric glyoxal can be de-polymerized to the monomeric form by distilling over phosphorus pentoxide. In the presence of alkali it undergoes the intramolecular Cannizzaro reaction, yielding glycolic acid. Treatment with ammonia gives imidazole, and with aromatic o-diamines it gives pyrazine derivatives.

References in periodicals archive ?
Further the property of gelatin film can improve by the chemical treatment, for example films reticulated with formaldehyde and glyoxal have higher tensile strengths, opacity, lower water vapor permeability, and good color differences than the untreated films [121].
Glyoxal and methylglyoxal levels in diabetic patients: quantitative determination by a new GC/MS method.
The scientists did not see any effect of diacetyl, glyoxal or methylglyoxal on the development of brown discoloration.
and South America, 40 [euro]/MT increase in Europe and $100/MT increase in Asia for glyoxal.
Investigative studies with the skin coloring agents dihydroxyacetone and glyoxal.
Eka PZC 5000 Potassium Based No Ammonia odor Recommended Dosage: Other features same as 4-8% on dry binder AZCOTE Eka RC 5550 High Potency product Can replace most Recommended Dosage: glyoxal based 5-10% on dry binder crosslinkers using lower dosages Best Starch Insolubilizer Gives best overall starch insolubilization.
Glyoxal in wassriger Losung als Additiv zur Schadstoffemissionssenkung bei fossiler Brennstoffen.
An aromatic component (Diacetyl) is one of the identified mutagens, as is the closely related methyl glyoxal, which is highly mutagenic in bacteria,
Ramsay and co-workers have obtained rotational constants and structures for cis and trans glyoxal in the ground state and in singlet and triplet excited states.
2015 Market Research Report on Global Glyoxal Industry : The report introduces Glyoxal basic information including definition, classification, application, industry chain structure, industry overview, policy analysis, and news analysis, etc.
Tenders are invited for Laboratory Surface Instrument Cleanser, With Didecyl Dimethyl Ammonium Chloride,Glutaral, Glyoxal.
Ch composites are prepared by blending it with polymers and by adding crosslinking reagents like glyoxal, formaldehyde, glutaraldehyde, epichlorohydrin, ethylene glycon diglycidyl ether, and isocyanates that can be used to improve Ch's adsorbent performance [16, 24, 25].