沒食子酸烷基酯化合物對紙張防黴性之改善效果

Improvements of Alkyl Gallates on the Anti-mildew Property of Paper

宋子萱(Tzu-Hsuan Sung)

指導教授 ： 張惠婷

國立臺灣大學/生物資源暨農學院/森林環境暨資源學研究所/碩士(2010年)

https://doi.org/10.6342/NTU.2010.01201

摘要

本研究目的為評估三種沒食子酸烷基酯化合物，沒食子酸丙酯、沒食子酸辛酯、沒食子酸月桂酯，以及丁基化羥基甲苯等抗氧化劑對於紙張防黴性的改善效果以及紙張性質的保護效果，其中以沒食子酸辛酯之改善效果最佳，當濃度為200 μg/cm2時，對Aspergillus terreus 和A. niger 生長面積的抑制率為85~90%，對於Chaetomiun globosum、Myrothecium verrucaria 和 Penicillium citrinum之抑制效果最為顯著，當濃度降低至25 μg/cm2時，仍可完全抑制黴菌之生長，且以沒食子酸辛酯處理紙張不會改變紙張原有性質。當沒食子酸辛酯處理濃度為100 μg/cm2時，即可有效改善黴菌對纖維素之降解，維持紙張之結晶度與熱穩定性等性質，避免紙張纖維素聚合度下降導致紙張物理性質降低，仍可維持原有的引張強度、撕裂強度與耐折度；且可預防黴菌於紙張表面留下難以修復的黴斑，對於紙張表面顏色、化學性質與物理性質皆具良好的保護效果。結合沒食子酸辛酯與百里香酚處理可使紙張的防黴活性大幅提升，當沒食子酸辛酯與百里香酚加乘處理濃度各為50 μg/cm2時，即可完全抑制C. globosum，對於A.niger與A.terreus亦有95%以上的抑制效果，比起單一藥劑處理濃度為100 μg/cm2時之抑制效果更佳。經過加速老化試驗後發現，沒食子酸辛酯處理濾紙仍保有優異的抗黴菌效果，百里香酚處理濾紙則普遍失去活性，顯示沒食子酸辛酯處理濾紙之耐久性較為良好。綜合上述結果可知，沒食子酸辛酯處理濾紙擁有優良的耐久性，在不影響紙張性質之前提下，能有效改善紙張之防黴性，抑制紙張黴害後的性質變化，以預防之觀點來說，相當符合理想防黴藥劑應具備有的條件，是非常值得後續研究與開發應用的防黴劑。

關鍵字

沒食子酸烷基酯化合物 ； 防黴性 ； 沒食子酸辛酯 ； 紙 ； 百里香酚

並列摘要

In this study, the inhibitory effects of three alkyl gallates, including propyl gallate, octyl galate, dodecyl gallate and butylated hydroxytoluene against mildew and the protective effects of paper properties were evaluated. In aspect of inhibitory effect against mildew, octyl gallate possessed the best anti-mildew activity and butylated hydroxytoluene couldn’t inhibit any mildew. At a concentration of 200 μg/cm2, the inhibition percentage of octyl gallate against Aspergillus terreus and A. niger were 85~90%, and octyl gallate could completely inhibit Chaetomiun globosum, Myrothecium verrucaria and Penicillium citrinum at a concentration of 25 μg/cm2. At a concentration of 100 μg/cm2, octyl gallate could maintain original crystallinity, thermal stability, degree of polymerization, tensile strength, tearing strength and folding endurance of paper materials. In addition, octyl gallate effectively prevents surface color, chemical and mechanical properties of paper from changing by mildew. Furthermore, the synergistic effect of octyl gallate and thymol against mildew was outstandingly enhanced. C. globosum was completely inhibited when combined octyl gallate and thymol at each concentration of 50 μg/cm2. And the inhibition percentage of treatment combined octyl gallate and thymol against A. niger and A. terreus were above 95%, which is much better than those of treating alone at a concentration of 100 μg/cm2. After accelerating aging, octyl gallate still owned excellent anti-mildew activity, but thymol lost the activity completely. The durability of octyl gallate is much better than thymol. Overall, octyl gallate could inhibit the growth of mildew and protect the paper properties from changing by mildew without affecting the original paper properties. Therefore, octyl gallate is an ideal environmentally benign anti-mildew reagent that is worthy of further research and application.

並列關鍵字

Alkyl gallates ； anti-mildew activity ； octyl gallate ； paper ； thymol

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