4 results about "Trans-Butenedioic acid" patented technology

The invention provides collagen composite gel for injection, and belongs to the technical field of biomedical materials. According to the invention, a modification method of the collagen is firstly constructed, the collagen with a specific sequence is mixed and then subjected to limited enzymolysis, a cross-linking reaction is carried out after enzyme deactivation, and the obtained collagen has better elasticity and proper viscosity. On the basis, sodium hyaluronate is dissolved in alkali liquor and reacts with 1, 4-butanediol diglycidyl ether and polyethylene glycol 400, and the modified sodium hyaluronate preparation is obtained. The collagen and the modified sodium hyaluronate are used as a skeleton, a cross-linking reaction is carried out in the environment of 1, 8-diazabicyclo [5.4. 0] undec-7-ene and fumaric acid, and the obtained collagen composite gel has a three-dimensional network structure and keeps good filling performance. Experimental verification shows that the collagen gel has remarkable collagen recovery capability, is good in filling performance and is not easy to calcify. The composition can be used for skin repair and regeneration.

The invention discloses a preparation method of a coordination polymer containing CuII and research on the inhibition effect of the coordination polymer on soil urease and nitrifying bacteria, and relates to the technical field of fertilizer.The preparation method comprises the steps that 3-aminopyridine and fumaric acid serve as raw materials to synthesize N1, N4-bis (3-pyridyl)-2-butenamide, then CuCl2. 2H2O and the synthesized N1, N4-bis (3-pyridyl)-2-butenamide are used for preparing the coordination polymer containing CuII. The novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is synthesized from N, N, N, N ', N'-bis (3-pyridyl)-2-butenamide and 5-hydroxyisophthalic acid by a hydrothermal method, and the crystal structure of the novel coordination polymer [Cu (3-bbpa) (5-HIPA). H2O] is analyzed to research the influence of the novel coordination polymer as an inhibitor on soil urease and nitrifying bacteria. The difunctional inhibitor is studied to delay the conversion process of urea from urea nitrogen to ammonium nitrogen and ammonium nitrogen to nitrate nitrogen, overcomes the defect of single inhibition capability of a traditional inhibitor, is strong in inhibition capability, low in toxicity, low in cost and simple in synthesis method, can effectively improve the utilization rate and stability of the fertilizer urea, and has a wide application prospect. Nitrogen loss in agricultural activities is reduced, the fertilization cost is reduced, and the grain yield is increased.

The invention discloses an ultra-fast and nondestructive testing method for solid cis-trans butenedioic acid, relates to the technical field of testing or analyzing materials by means of measuring chemical or physical properties of the materials, and is suitable for quality control of chemical raw materials and monitoring of an organic synthesis process. Comprising the following steps: taking mixed powder of a cis-isomer and a trans-isomer of butenedioic acid; sequentially carrying out ultrasonic mixing and tabletting forming on the mixed powder, and obtaining a characteristic peak area ratio of a cis-isomer to a trans-isomer of the butenedioic acid by adopting a Raman spectrum; establishing a prediction model; and based on the prediction model, predicting to obtain the mass ratio of the cis-isomer to the trans-isomer of the butenedioic acid in the pretreated powder. According to the method, the high-uniformity sample is constructed by screening to control the particle size and ultrasonic dry mixing, and meanwhile, precise measurement of the mass fraction of the cis-trans isomer mixture is realized by combining precise control of tabletting process parameter pressure.