crotonic acid


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crotonic acid

/cro·ton·ic ac·id/ (kro-ton´ik) an unsaturated fatty acid found in croton oil.
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Traditionally, crotonic acid assay was rapid and easy way to quantify PHB but presently, characterization and quantification of various PHA can also be accomplished using advanced analytical techniques like FTIR (Fourier transform infrared spectroscopy) [8].
SEL2 was analyzed by more advance and accurate techniques such as TEM, Crotonic acid assay, GC/ MS, FTIR and 1H NMR.
A standard curve was established with the standard 99% pure crotonic acid (SigmaAldrich) for the determination of the quantity of crotonic acid produced by bacterial strains.
N-isopropyl acrylamide (NIPAAm) (Aldrich, Milwaukee, USA), acrylamide (AAm) (Merck Darmstadt, Germany), crotonic acid (CA) (Sigma, St.
10 The chamber (right in photo) is next heated to 300[degrees]C, breaking down the PHB into a chemical called crotonic acid.
The viscosity measurements table 3, show that the incorporation of crotonic acid with acrylic acid with a quantity going from 0.
Keywords: Bioplymers poly-AY-hydroxybutyrate Bacillus thuringiensis strain crotonic acid high performance liquid chromatography.
The concentrations of VFA in the fermentation fluid were determined by gas chromatography (Filipek and Dvorak, 2009) using crotonic acid as the internal standard with a gas chromatograph (model GC-2010; SHIMADZU Corporation, Kyoto, Japan).
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.
Copolymers of vinyl esters and crotonic acid present as film-forming agents or binders in hair sprays and hair setting lotions very frequently present the drawback that they still contain residual unreacted monomers and impurities.