crotonic acid


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crotonic acid

[krō′tän·ik ′as·əd]
(organic chemistry)
C3H5COOH An unsaturated acid, with colorless, monoclinic crystals, soluble in water; used in the preparation of synthetic resins, plasticizers, and pharmaceuticals.
References in periodicals archive ?
Here, especially the crotonic acid which is produced in an unzipping reaction at the end of the polymer chains, strongly accelerates the degradation and therefore an immense weight loss takes place.
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.
10 The chamber (right in photo) is next heated to 300[degrees]C, breaking down the PHB into a chemical called crotonic acid.
This complex is also prepared by the same procedure as above with molar ratio of CdCO3, 1 g, 0.006 mol: crotonic acid, 3.44 g, 0.04 mol: hydrazine hydrate, 2.5 mL, 0.05 mol.
The viscosity measurements table 3, show that the incorporation of crotonic acid with acrylic acid with a quantity going from 0.5 g to 2.0 g decreases the overall molecular weights of the copolymers and makes fall the molecular weight from 54000 to 25000 g/mol, i.e.
Table 5 -- unsaturated and saturated fatty acids Unsaturated Saturated Crotonic acid Butyric acid Oleic acid Caproic acid Vaccenic acid Caprylic acid Linoleic acid Capric acid Linolenic acid Lauric acid Erucid acid Myristic acid Palmitic acid Stearic acid
In this study, Oleic acid, Crotonic acid and acrylic acid as well as 3-Phenyl-2-propenoic acid were purchased either from SHANG HAI BOER CHEMICAL REAGENT CO., LTD or from Tianjin No.3 Chemical Reagent Factory.
Ruminal VFA were quantified using gas chromatography (Agilent Technologies 7890A; Santa Clara, CA, USA) with crotonic acid as an internal standard and a capillary column (30 mx0.32 mmx0.5 m; Phenomenex Inc., Torrance, CA, USA) by using flame ionization detection.
P(NIPAAm-co-AAm) and p(NIPAAm-co-AAm)/XA hydrogels that contain crotonic acid (CA) exhibit a lover critical solution temperature (LCST) at 28[degrees]C, whereas p(NIPAAm-ce;-AAm)/IA, and P(NIPAAm-co-AAm)/ACA hydrogels exhibit a lover critical solution temperature at 30.7[degrees]C and 34.4[degrees]C, respectively.
Keywords: Bioplymers poly-AY-hydroxybutyrate Bacillus thuringiensis strain crotonic acid high performance liquid chromatography.
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.
The accumulated PHA was extracted by direct addition of sodium dodysyl sulphate in the culture medium, which yielded 52.3+-0.56 ug/l and 136.21+-0.45 ug/l PHA respectively when assayed with Crotonic acid. The PHA detection medium (PDM) provided nutrient limitation condition which favored accumulation of PHA granules.