Onsøyen E, Skaugrud O
Protan A/S, Drammen, Norway.
J Chem Technol Biotechnol. 1990;49(4):395-404. doi: 10.1002/jctb.280490410.
Chitosan is a natural polycationic polymer which possesses valuable properties as a metal recovering and water purifying agent. Applications are waste water treatment for heavy metal and radio isotope removal and valuable metal recovery, potable water purification for reduction of unwanted metals, agriculture--controlled release of trace metals essential to plant growth, food--complex binding of iron in precooked food to reduce 'warmed-over flavour'. The interactions of metals with chitosan are complex, probably simultaneously dominated by adsorption, ion-exchange and chelation. To study this it is of utmost importance to work with well characterized chitosans. This has been a problem as available characterizing methodology is limited. Degree of polymerization and deacetylation and the distribution of acetyl groups along the polymer chain is of crucial importance for chitosan metal interacting characteristics. Making chemical derivatives is a way to alter the metal interacting characteristics of chitosan. Chitosan possesses general coagulant/flocculant characteristics towards bio-molecules and surfaces.
壳聚糖是一种天然的聚阳离子聚合物，作为金属回收和水净化剂具有宝贵的特性。其应用包括用于去除重金属和放射性同位素以及回收有价金属的废水处理、用于减少有害金属的饮用水净化、农业——控制释放植物生长必需的微量金属、食品——在预煮食品中与铁形成络合物结合以减少“回锅味”。金属与壳聚糖的相互作用很复杂，可能同时受吸附、离子交换和螯合作用主导。为了研究这一点，使用特性良好的壳聚糖至关重要。但这一直是个问题，因为可用的表征方法有限。聚合度、脱乙酰度以及乙酰基沿聚合物链的分布对于壳聚糖与金属的相互作用特性至关重要。制备化学衍生物是改变壳聚糖与金属相互作用特性一种方法。壳聚糖对生物分子和表面具有一般的凝聚/絮凝特性。
