5 results about "Methyl phenylacetate" patented technology

This invention provides a flavoring agent for enhancing the honey-sweet aroma of tobacco, comprising the following raw materials and their mass percentages: 0.2-0.3% 2,3-pentanedione, 0.45-0.55% phenylacetic acid, 0.45-0.55% phenethyl acetate, 0.25-0.4% phenylethanol, 0.45-0.6% methyl phenylacetate, 0.45-0.6% ethyl phenylacetate, 0.5-0.6% menthyl acetate, 0.15-0.25% geraniol, and the balance being propylene glycol. This invention belongs to the field of tobacco flavoring technology. By combining 2,3-pentanedione, phenylacetic acid, and phenethyl acetate in a specific mass ratio and conducting testing and evaluation, a flavoring agent suitable for enhancing the honey-sweet aroma of tobacco has been successfully developed. The composition is clearly defined, significantly improving the honey-sweet aroma of tobacco products, with a rich and long-lasting aroma, and good taste harmony.

The invention discloses a chitosan-based membrane as well as a preparation method and application thereof, and belongs to the technical field of packaging materials. The chitosan-based film has a double-layer structure consisting of an inner layer and an outer layer, the outer layer is a water-blocking antibacterial layer formed by a silver complex, and the inner layer is an antibacterial antioxidant layer formed by polyphenol; the silver complex is a complex which is formed by the reaction of pyrrole-2-formaldehyde-g-chitosan and silver acetate; the polyphenol is formed by grafting 3, 4-dihydroxy methyl phenylacetate on the chitosan. The silver complex water-blocking antibacterial layer is constructed on the outer layer, and the polyphenol antibacterial anti-oxidation layer is constructed on the inner layer, so that the double fresh-keeping mechanism of external protection and internal maintenance is realized, and the comprehensive performance and application potential of the material are remarkably improved.

The invention provides a preparation method and application of methyl 2-hydroxyphenylacetate. The methyl 2-hydroxyphenylacetate is separated from a fermentation culture of streptomyces wetland 13-3 with the preservation number of CGMCC (China General Microbiological Culture Collection Center) No. 22830. According to the method, the compound methyl 2-hydroxyphenylacetate is obtained from streptomycete for the first time, verification proves that the methyl 2-hydroxyphenylacetate has broad-spectrum antibacterial activity on various plant pathogenic fungi, particularly, the inhibitory activity on aspergillus fumigatus, colletotrichum truncatum, rhizoctonia solani, verruca verrucosa and magnaporthe oryzae is higher than that of amphotericin B, and the methyl 2-hydroxyphenylacetate can be used for preparing antibacterial agent drugs and has broad-spectrum antibacterial activity. A novel natural antibacterial compound is provided for the fields of agriculture and medicine, and the method is simple and convenient to operate, high in purification efficiency and environment-friendly.

The invention provides a preparation method of 3-isochromone, and relates to the technical field of organic synthesis. Specifically, methyl phenylacetate and N, N-dimethylformamide are used as raw materials, and 3-isochromone is prepared through a Vilsmeier-Haack reaction; preferably, the methyl phenylacetate, the N, N-dimethylformamide and the phosphorus oxychloride are mixed, a Vilsmeier-Haack reaction is carried out, then an intramolecular condensation reaction is carried out, and the 3-isochromone is prepared. The method has the advantages of simple and easily available starting materials, short reaction steps and no use of highly toxic chemicals, provides a new route for expanding the synthesis method of 3-isochromone, and has a good application prospect.

The invention relates to the technical field of compound purification, and discloses a static melt crystallization purification method of 2-(((6-(trifluoromethyl)-2-pyridyl) oxy) methyl) methyl phenylacetate, which comprises the following steps: S1, first-stage static crystallization: the cooling rate is 0.5-5 DEG C / h, the crystallization temperature is 25-35 DEG C, the crystallization amount is controlled to be 60-90%, then segmental sweating purification is performed, and a product is extracted; and S2, secondary mother liquor recovery and crystallization: carrying out static crystallization at the cooling rate of 1-7 DEG C / h and the crystallization temperature of 20-35 DEG C, and then sweating and extracting a secondary crystallization product. According to the invention, through a gradient melt crystallization coupling segmented sweating technology, 94.6% of raw materials are purified to 99.7% or more (single impurity content is less than 0.1%, toluene residue content is less than 0.3%, and water content is less than 0.1%) at a single time; mother liquor is recycled, crystallized and purified to the raw material level and then reused, and the total yield breaks through 90% and is improved by 20% or above compared with solvent crystallization; and on the basis of residual liquid control of the lowest co-melting point, the waste liquid discharge amount is reduced by 50%. The method solves the problems of purity, yield and environmental protection bottlenecks of solvent crystallization within 12 hours, and is suitable for industrial continuous production.