카르복시메틸셀룰로오스의 화학적 성질

Cellulose derivatives with carboxymethyl substituents are prepared by treating cellulose with sodium hydroxide to form alkali cellulose, and then reacting with monochloroacetic acid. The glucose unit that constitutes cellulose has three replaceable hydroxyl groups, so products with different degrees of substitution can be obtained. 1mmol of carboxymethyl is introduced into the solution of water and dilute acid per 1g of dry weight, but it can swell and be used for ion exchange chromatography. Carboxymethyl pKa is about 4 in pure water and about 3.5 in 0.5mol/L NaCl. It is a weak acidic cation exchanger and is usually used for the separation of neutral and basic proteins when pH>4. 카르복시메틸로 대체된 수산기의 40% 이상이 물에 용해되어 안정한 고점도 콜로이드 용액을 형성할 수 있습니다.