关键词: 香蕉皮, 干燥方式, 植物色素, 稳定性, 色牢度

Abstract: The aim of this study was to obtain a yellow-brown natural dyestuff and to improve the utilization of banana peel by-products,in the phase of growing environmental concerns.Banana peel was dried by three different methods:freeze drying,vacuum drying and blast drying.A dyestuff was extracted from the processed peels via ultrasonic wave and dyed with a wool fabric.The results showed that banana peel had good thermal stability,the FT-IR spectra of the banana peel powders with different drying methods did not reveal significant change;the initial decomposition temperatures for banana peel powder in the air and nitrogen atmospheres were both 170 ℃;banana peel powder at 105 ℃ in nitrogen atmosphere for 120 min did not show significant decomposition.Different absorbance curves and wool fabric’s color characteristic values were obtained with the three drying methods,the vacuum drying 105 ℃ powder extract colorants dyed with wool fabric deepest,which was more suitable for banana peel dry,and had good color fastness to wash with soap,rubbing,light and hot pressing and graded above 3 in total.

Key words: banana peel, drying methods, natural dyestuff, stability, color fastness