干燥方法对几种植物染色能力的影响

Effect of Drying Methods on Dyeing Capacity of Various Plants

本文研究了蓝桉树皮和洋葱皮干燥方法对化学浆染色能力的影响。这些植物材料含有丰富的多酚类化合物,如单宁酸、花青素和其他黄酮类化合物,是天然的着色剂。本文研究了不同条件下的自然干燥、空气干燥和冷冻干燥三种方法。此外,还研究了提取条件对两种植物样本染色能力的影响。自然干燥的植物样本与空气干燥和冷冻干燥的植物样本相比,呈现出很弱的染色能力。空气干燥和冷冻干燥具有相似的染色结果。在空气干燥实验中,在低温(T=30℃)和高湿度(95%RH)条件下干燥可以获得很强的染色能力。而对于提取条件,染色能力主要取决于提取温度,而停留时间对染色能力影响甚微。

This paper presents a study on the effect of drying methods of Eucalyptus globulus L. bark and Allium cepa L. peels on their dyeing capacity of chemical pulp.These plant materials are rich in polyphenolic compounds such as tannins, anthocyanins and other flavonoids, which are natural colorants. In the frames of this work, three different drying methods were examined, the natural, the air and the freeze drying method, in various conditions. Moreover, the effects of extraction conditions on the dyeing capacity of both plant samples were also examined. The plant materials that were dried naturally show weak dyeing result in comparison with the air and freeze dried ones. Moreover, freeze drying gave similar dyeing result with air drying. In the case of air drying, the stronger dyeing capacity were achieved from plant materials that were dried at low temperature and high relative humidity （T = 30 ℃ and 95% RH）. Referring to the extraction conditions, the dyeing capacity depends primarily on the extraction temperature while the residence time shows minor impact.