Abstract:
The present invention relates to a double ion pH-sensitive copolymer which performs micelle/demicellizaiton according to pH change, a manufacturing method thereof, and micelles including the same. A block copolymer according to the present invention is able to not only form micelles but also break micelles by controlling pH since the block copolymer has pH sensitivity and is able to selectively discharge drugs and the like to an affected area with low pH when injecting micelles formed by the block copolymers into a body by sealing treatment drugs, a contrast medium, a molecular imaging indicator and the like in the inner space of the micelles, thereby being applicable as a drug carrier for the diagnosis and/or treatment of disease.
Abstract:
PURPOSE: A multi-block copolymer is provided to have biodegradability sensitive not to only temperature, but pH, and to able to retrain initial burst release phenomenon of drugs. CONSTITUTION: A multi-block copolymer comprises a first block having an ester bond, a second block combining a urethane bond, and an ethylene glycol based third block. The first block having an ester bond is poly(β-aminoester). The second block formed of polyurethanes which has alkyl diisocyanate as a starting material. A manufacturing method of the multi-block copolymer comprises a step of polymerizing poly(β-aminoester), a polyethylene glycol based compound, and alkyl diisocyanate which is one starting material of polyurethane based oligomer.
Abstract:
PURPOSE: A temperature and pH-sensitive star-shaped block copolymer with excellent bioadhesion is provided to ensure safety in vivo and to diagnose diseases. CONSTITUTION: A temperature and pH-sensitive star-shaped block copolymer with excellent bioadhesion contains 4-arm polyethylene-based compounds and poly(beta-amino ester)-based oligomers. The oligomers are bonded with the 4-arm polyethylene glycol by Michael reaction. The poly(beta-amino ester)-based oligomers are formed by polymerization of dioldiacrylate compounds and amine compounds in a molar ratio of 1 : 0.5-1:2. An injectable hydrogel type drug delivery system contains the block copolymers or hydrogel and physiologically active materials.
Abstract:
PURPOSE: A manufacturing method of pH-sensitive polymersome is provided to accept hydrophobic and hydrophilic drug at the same time. CONSTITUTION: A manufacturing method of pH-sensitive polymersome comprises: a step of forming a poly(β-aminoester) by reacting a bisacrylate compound, and an amine based compound having hydroxy group; a step of forming hydroxyl group in the side chain of the poly (β - amino ester) compound; a step of polymerizing the (β - amino ester) compound, and the lactide; a step of copolymerizing the polyethylene glycol compound to the polymer.
Abstract:
본 발명은 질환의 진단 및 치료를 위한 다양한 진단제와 다양한 치료제 전달을 위한 전달체로서 사용 가능할 수 있는 pH 민감성 공중합체, 이의 제조방법 및 이를 이용한 폴리머좀(polymersome) 약물 조성물에 관한 것으로서, 보다 상세하게는 pH에 따라 물에 대한 용해도 특성을 갖는 폴리(β-아미노 에스터) 화합물에 원래 가지고 있는 pH 민감성기외에 측쇄로 하이드록실기를 갖도록 분자설계한 후에 락타이드를 개환중합을 통해 공중합시켜 소수성 블록을 형성시킨 후에 친수성 블록으로말단이 카르복실기로 치환된 폴리에틸렌글리콜 화합물을 공중합시킴으로써, 소수성 및 친수성 약물 양쪽다 전달이 가능한 pH 민감성 폴리(β-아미노 에스터)-폴리락틱산-폴리에틸렌글리콜 공중합체 및 이의 제조방법, 상기 공중합체를 포함하는 폴리머좀형 진단제 및 약물� ��달을 위한 조성물을 제공하는 것이다.
Abstract:
본 발명은 기존의 폴리우레탄 하이드로젤의 단점이었었던 생분해성을 획기적으로 개선코자 생분해성이 우수한 폴리(β-아미노 에스터) 계열의 출발물질을 미첼반응(Michael reaction)을 시켜 형성된 폴리(β-아미노 에스터) 올리고머(A)에 폴리에틸렌글리콜 계열 화합물(B)과 폴리우레탄 계열의 출발물질(C)을 혼합하여 우레탄반응을 통하여 제조한 폴리(β-아미노에스터 우레탄)-폴리에틸렌 다중블록 공중합체인 하이드로젤로서, 온도 민감성인 친수성과 소수성기를 동시에 지닌 양친성(兩親性) 특성과 주변환경의 pH에 따라 이온화 특성이 변화하는 pH 민감 특성을 통해 고분자 하이드로젤 구조를 형성할 수 있으며, 이를 통해 인체 내 주사시 체내 pH 변화에 따른 장기 서방성 약물 전달체로 사용될 수 있는 폴리(β-아미노에스터 우레탄)-폴리에틸렌글리콜 공중합체 및 이의 제조방법과 이를 이용한 약물전달체를 제공한다.
Abstract:
PURPOSE: A pH-sensitive copolymer and a polymersome using the same are provided to express sustained release according to pH condition in human body. CONSTITUTION: A pH-sensitive polymersome contains copolymers including 10-70 wt% of poly(beta-amino ester), 30-80 wt% of polylactic acid-based compounds, and 1-10 wt% of polyethylene glycol-based compounds. The molar ratio of the poly(beta-amino ester) compounds, polylactic acid-based compounds, and polyethylene glycol-based compounds is 10:24:1-10:5:1. The polymersomes contain copolymers including biocompatible and pH-sensitive compounds(A), hydrophilic and biodegradable compounds(B), and hydrophobic and biodegradable compounds(C).