Abstract:
Método de producción de un péptido mediante un método de síntesis en fase líquida, que comprende etapas de: etapa A: una etapa de hacer reaccionar un éster activo de un componente de ácido con un componente de amina para obtener un compuesto condensado; etapa B: una etapa de hidrolizar el éster activo sin reaccionar del componente de ácido poniendo en contacto la mezcla de reacción obtenida en la etapa A dos veces o más con una base y manteniendo una condición básica hasta que la cantidad del éster activo sin reaccionar restante del componente de ácido disminuye hasta el 1% o menos, y luego purificar el compuesto condensado eliminando impurezas solubles en agua incluyendo el producto descompuesto del éster activo del componente de ácido llevando a cabo extracción y lavado con una disolución acuosa; etapa C: una etapa de retirar un grupo protector para un grupo amino N-terminal del compuesto condensado obtenido en la etapa B; y etapa D: una etapa de purificar el compuesto condensado desprotegido en el grupo amino N-terminal eliminando una impureza en una mezcla de reacción obtenida en la etapa C, si es necesario; y en el que, en la etapa A, el componente de ácido es un aminoácido o un péptido, protegido en un grupo amino N-terminal mediante un grupo protector retirable en una condición ácida; y el componente de amina es un aminoácido o un péptido, protegido en un grupo carboxilo C-terminal mediante un grupo protector estable en una condición ácida.
Abstract:
The present invention is related to a method of producing a peptide, characterized in contacting a reaction mixture with a base after a condensation reaction to hydrolyze while a basic condition is maintained until a ratio of a remaining unreacted active ester of an acid component is decreased to 1% or less in a liquid phase peptide synthesis method. According to the invention, a target peptide of high purity can be simply and efficiently produced by a continuous liquid phase synthesis method. Further, the present invention is related to a method of producing a peptide, characterized in using an amide-type solvent immiscible with water in a liquid phase peptide synthesis method. According to the invention, various peptides can be produced by the liquid phase synthesis method without being restricted by the amino acid sequence of the target peptide.
Abstract:
The objective of the present invention is to provide to a method for easily producing high-performance porous cellulose beads having high mechanical strength. Also, the objective of the present invention is to provide an adsorbent produced from the high-performance porous cellulose beads. According to the present invention, high-performance porous cellulose beads can be easily produced from porous cellulose beads, and an adsorbent having high strength and high adsorption amount can be easily produced from the high-performance porous cellulose beads.
Abstract:
The objective of the present invention is to provide a method for easily and efficiently producing cellulose beads which have pore shape suitable for an adsorbent and of which adsorption performance is excellent without using highly toxic and highly corrosive auxiliary raw material and without industrially disadvantageous cumbersome step. The method for producing porous cellulose beads according to the present invention is characterized in comprising (a) the step of preparing a fine cellulose dispersion by mixing a low temperature alkaline aqueous solution and cellulose, (b) the step of preparing a mixed liquid by adding a crosslinking agent to the fine cellulose dispersion, (c) the step of preparing an emulsion by dispersing the mixed liquid in a dispersion medium, (d) the step of contacting the emulsion with a coagulating solvent.