金姚杰 傅科杰 保琦蓓 唐志荣 周文龙 马明波
摘要:天然棕色棉与普通白棉化学成分和结构十分接近,常规的鉴别方法难以快速、方便地鉴别两者。根据天然棕色棉色素的化学性质,利用芳香醛与纤维中的多酚色素反应改变纤维的颜色,可快速鉴别天然棕色棉。本研究选择了对二甲基氨基肉桂醛作为反应试剂,研究了反应试剂质量分数、盐酸体积分数、温度、时间对天然棕色棉纤维颜色的影响。结果表明:在50 ℃,盐酸体积分数3%,对二甲基氨基肉桂醛质量分数0.05%的条件下反应2 min,即可有效鉴别真假天然棕色棉纤维。
关键词:天然彩色棉;对二甲基氨基肉桂醛;酚醛反应;显色反应;定性鉴别
中图分类号:TS190.2文献标志码:A文章编号:1009-265X(2018)03-0062-04Color Development Reaction Characteristics of 2Dimethylaminocinnamaldehyde
with Naturally Brown Cotton Fiber
JIN Yaojie1, FU Kejie2, BAO Qibei2, TANG Zhirong1, ZHOU Wenlong1, MA Mingbo1,3
(1.College of Materials and Textiles, Zhejiang SciTech University, Hangzhou 310018, China;
2.Textile Inspection Center, Ningbo Entry Exit Inspection and Quarantine Bureau, Ningbo
315000, China; 3.Hubei Key Laboratory of Biomass Fibers and Ecodyeing &
Finishing, Wuhan Textile University, Wuhan 430073, China)Abstract:Since chemical components and structure of naturally brown cotton (NBC) and the common white cotton are quite similar, it is hard to identify the two by using common method. Based on the chemical characteristics of the pigments of NBC, aromatic aldehydes could react with the polyphenolic pigments of NBC to change the color of fiber, which could be used to identify the NBC. In this study, 2Dimethylaminocinnamaldehyde was used as the reagent to study the effects of reagent concentration, HCl concentration, reaction temperature and reaction time on the color on color of NBC. The results show that NBC could be effectively identified under the following conditions: reaction temperature 50 ℃, 3% HCl and 0.05% 2Dimethylaminocinnamaldehyde, time 2 min.
Key words:naturally colored cotton; 2Dimethylaminocinnamaldehyde; phenolicaldehyde reaction; color development reaction; qualitative identification
通信作者:馬明波,Email:mamingbo@zstu.edu.cn天然彩色棉本身带有色彩,无需染色,具有健康环保优势。其还具有一些普通纺织纤维所没有的特性,比如抗菌性能、抗氧化性能和紫外线防护性能[13]。天然彩色棉产品受消费者欢迎,其销售价格较高。天然彩色棉易于被染色棉假冒,出于商业利益,利用染色棉冒充天然彩色棉原料和产品的行为时有发生。天然彩色棉的商业鉴别工作的重要性不言而喻,然而,真假天然彩色棉主要的化学成分、结构和性能十分相似[45],给天然彩棉原料和产品的检测、鉴别带来了挑战。目前报道了许多检测方法,如核磁共振法、紫外可见漫反射光谱法虽然可有效鉴别真假天然彩色棉[67],但是仪器昂贵,制样较复杂,限制了这些方法的应用。……