maleic acid


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maleic acid

(məlē`ĭk): see fumaric acidfumaric acid
or trans-butenedioic acid,
HO2CCH=CHCO2H, unsaturated dicarboxylic acid that melts at 287°C;. Maleic acid, or cis-butenedioic acid, is a geometric isomer of fumaric acid; it melts at about 140°C;.
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maleic acid

[mə′lā·ik ′as·əd]
(organic chemistry)
HOOCCH:CHCOOH A colorless, crystalline dibasic acid; soluble in water, acetone, and alcohol; melting point 130-131°C; used in textile processing, and as an oil and fat preservative.
References in periodicals archive ?
Rahimi, "The effect of sulfuric acid and maleic acid on characteristics of nano-cellulose produced from waste office paper," International Journal of Nano Dimension, vol.
For estimating the efficiency of poly maleic acid as a cross linking agent a comparative study should be made with samples made from standard cross linking agents.
The absorption band at 1710 [cm.sup.-1] is due to asymmetrical stretching for -COOH group of maleic acid. The substitution of MA was also confirmed by the absorption band observed at 1230 [cm.sup.-1] which indicates the -C-O-O-stretching vibrations of ester.
Louis, MO, USA) and maleic acid (MAL, Fluka Chemika, Steinheim, Switzerland) were added in doses of 8 mmol/L.
The FDA said food products containing maleic acid were illegal in the country according to various laws including the Consumer Act of the Philippines and the FDA Act of 2009.
He said Taiwanese food products contaminated with maleic acid were tested and reported by the Agri-Food and Veterinary Authority (AVA) of Singapore.
While maleic acid, the cis isomer, is a synthetic organic compound, its trans isomer, fumaric acid, is an organic acid widely found in nature (Felthhouse et al., 2001).
While the LUMO is principally on the maleic acid segment.
Hydrogels obtained from acrylamide, maleic acid, acrylic acid and octylmonoitaconate: synthesis, absorbent capacity and pH variations in copper sulfate solutions
The olefinically unsaturated monomer corresponds to one or more monomers selected from at least one olefinically unsaturated monomer selected from the group consisting of: a) mono- and di-esters of crotonic acid, cinnamic acid, fumaric acid, maleic acid, citraconic acid, and itaconic acid; b) carboxyfunctional monomers; c) N-vinyl caprolactam, vinyl phosphonates, N-vinyl formamides, N-vinyl acetamides, hydroxypropyl acrylates and methacrylates, monoacrylates and monomethacrylates of polyalkylene glycols, acrylates, methacrylates, acrylic acid and methacrylic acid amides containing amine groups; d) vinyl esters corresponding to general formula (I) CH2xCH--O--C(O)--R1, with R1=C11-21.
0.2 M acid Na maleate (8 g NaOH + 23.2 g maleic acid or 19.6 g maleic anhydride in 1000 mL)
Moreover, the stabilization due to multidentate binding is particularly apparent in the case of maleic acid (where [Cs.sup.+] can simultaneously interact with adjacent carbonyl oxygen atoms) with the CsCA 23.5 kcal/mol being almost 9 kcal/mol higher than in the case of fumaric acid for lack of this kind of stabilization.