和尚蟹皮膜與人工幾丁聚醣膜之物性研究

Abstract

本研究針對幾丁聚醣（Chitosan）之物性量測進行探討，以和尚蟹（Mictyris brevidactylus）之皮膜為天然幾丁聚醣之來源，在不同去乙醯率（Degree of deacetylation）下，探討幾丁聚醣膜之拉力強度、含水率以及厚度間之關係，並與人工幾丁聚醣膜作比較。 結果發現，幾丁聚醣在去乙醯率48 % ∼ 55 % 時，具有最大膜厚及最小拉力強度。去乙醯率較低時，機械強度隨去乙醯率上升而減少；而去乙醯率較高時，機械強度隨去乙醯率提升而增加，而膜厚隨去乙醯率上升而減低。在不同去乙醯率下，膜厚與拉力強度之數值呈現高度負相關（R2 = 0.9547），且含水率與膜厚之數值呈正相關（R2 = 0.8665）。

In this study, measurement method and results for physical properties of chitosan membranes made from the carapace of the soldier crab Mictyris brevidactylus were discussed. Tensile strength, moisture and membrane thickness of chitosan membranes with various degree of deacelyation (DD) were measured. Besides, the physical properties of artificial chitosan membranes were further compared and discussed. Experimental results showed that the maximal membrane thickness and the minimal tensile strength were obtained by using various chitosan membranes with DD value about 48 % ~ 55 %. In chitosan membranes with lower DD, strength of membrane decreased during DD increase. However, in the chitosan membranes with higher DD, strength of membrane increased during DD increase, but membrane thickness decreased during DD increase. With various DD, a high negative correlation (R2 = 0.9547) was obtained between membrane thickness and tensile strength of chitosan membrane, and a positive correlation (R2 = 0.8665) was obtained between moisture and membrane thickness of chitosan membrane, respectively.