Abstract:
A method for preparing a microbead of a hyaluronic acid derivative is provided to produce the microbead of the hyaluronic acid derivative efficiently through a high efficient reaction and a simple recovery process using a small amount of a crosslinking agent, the microbead showing excellent bio-compatibility, excellent swellability and excellent physical stability, thereby the microbead being usefully used as a filler, an implant, a drug delivery matrix, a cell carrier, a scaffold, and an agent for improving joint function. To prepare a microbead of a hyaluronic acid derivative, a hyaluronic acid or an alkaline aqueous solution of a salt thereof is crosslinked with an oil layer using 1,4-butandiol diglycidyl ether(BDDE) as a crosslinking agent with mixing. A microbead of hyaluronic acid derivatives for medical purpose is prepared by the method and is able to be sterilized at a temperature of 121 deg.C. Further, the oil is natural oil, synthesis oil or mineral oil, and has 10 to 500 cP of viscosity.
Abstract:
PURPOSE: An anti-adhesion agent containing hyaluronic acid epoxide derivative hydrogel and a method for manufacturing the same are provided to prevent adhesion between tissues without side effects. CONSTITUTION: An anti-adhesion agent contains hyaluronic acid epoxide derivative hydrogen. The particle size of the hydrogel is 100-300 um. The viscosity and crosslinking density of the hydrogel are 100,000 cP (0.02 Hz)-6,000,000 cP (0.02 Hz) and 0.2 mol%-100 mol%, respectively. The hydrogel is prepared by reacting hyaluronic acid and epoxide crosslinking agent in NaOH solution or crossliking 0.1-200 weight parts of crosslinking agent based on 100 weight parts of repeat unit of the hyaluronic acid.
Abstract:
PURPOSE: A novel transformation system in Sebekia benihana is provided to express homo or hetero protein or polypeptide and to transform physiologically active material. CONSTITUTION: A method for transforming Sebekia benihana strain comprises: a step of culturing Sebekia benihana for 3-7 days to form spore; a step of performing heat shock at 40-60 °C fkor 15-25 minutes and inducing germination of mycelium; a step of cooling at room temperature; a step of preparing transformed E.coli with an expression vector; a step of mixing the mycelium and E.coli and culturing for 16-18 hours; a step of selecting Sebekia benihana.
Abstract:
본 발명은 히알루론산 에폭사이드 유도체 하이드로겔을 포함하는 유착방지제 및 이의 제조 방법에 관한 것이다. 보다 상세하게는, 본 발명은 수술 후 조직 간의 유착 방지 등의 용도로 사용되는 히알루론산 에폭사이드 유도체 하이드로겔을 포함하는 유착방지제 및 이의 제조 방법에 대한 것이다. 유착방지제
Abstract:
A hyaluronic acid and a carboxy methyl cellulose composite derivative film is provided to have trachea reducing adhesion property, excellent biodegradation property and property absorbed by being completely disassembled after preventing adhesion phenomenon. An N-acylation urea pendant form and an auto-cross-linking form are mixed in hyaluronic acid and carboxy methyl cellulose composite derivative film. The N-acylation urea pendant form and an auto-cross-linking form are made by reacting crosslink activity agent and cross linkage activity supplement at hyaluronic acid and carboxy methyl cellulose complex film surface. The derivative film with the N-acylation urea pendant form is formed by using the crosslink activity agent 0.01 ~ 500 parts by weight and the cross linkage activity supplement 0.01 ~ 200 parts by weight based on compound of the carboxy methyl cellulose and hyaluronic acid 100 parts by weight. The derivative film with the auto-cross-linking form is formed by using the crosslink activity agent 0.01 ~ 500 parts by weight and the cross linkage activity supplement 40 ~ 1000 parts by weight.
Abstract:
PURPOSE: A novel transformation system in Tolypocladiium niveum is provided to enhance cyclosporine A productivity and to industrially and medically use. CONSTITUTION: A method for preparing transformed Tolypocladium niveum comprises: a step of forming protoplast of Tolypocladium niveum; a step of preparing a recombinant vector in which foreign gene is introduced; a step of transforming by mixing PEG and the recombinant vector together with the protoplast; and a step of selecting Tolypocladium niveum using a selection marker. The transformed Tolypocladium niveum produces cyclosporine A of high concentrate.
Abstract:
A method for preparing hyaluronic acid derivatives is provided to produce three-dimensionally porous hyaluronic acid derivatives having characteristics usable as a cell delivery carrier through wet spinning. A method for preparing hyaluronic acid derivatives includes a step of producing the derivatives of hyaluronic acid or salts thereof having excellent biocompatibility and biodegradability usable as a cell delivery carrier of a cell treatment agent comprising stem cells through wet spinning. The biocompatible hyaluronic acid threads by wet spinning are produced by using a proper mixture solution of dimethylsulfoxide and distilled water as a solvent of a spinning solution for the hyaluronic acid or salt thereof, and using ethanol, dimethylformamide, or a mixture solution thereof as a solidifying solvent.