棉纤维中果胶与角质的附生关系

The Epiphytic Relationship between Pectin and Cutin in Cotton Fiber

对棉纤维中果胶和角质层的角质的附生关系进行假设,构建了4种模型:层层式、层层-分散式、树状-分散式和树状式.通过脱蜡前后染色和草酸铵抽提对棉纤的果胶含量加以测定,经过扫描电子显微镜(SEM)和衰减全反射傅里叶红外光谱(FTIR-ATR)分析得出:果胶与角质的附生关系符合层层式,角质中不含游离果胶,角质与果胶并无相互穿插、迭加或包覆,而是有着较为清晰的层次界限,角质在外层,果胶在内层,果胶将蜡状物质黏附于纤维素或半纤维素的表面.

A hypothesis of the epiphytic relationship between the pectin and the cutin of cuticle layer in cotton fiber was put forward, and four models including the namely layer style, the layer-dispersion style, the arborescence style and the arboreseence-dispersion style were built, respectively. The pectin content of cotton fiber was measured with copper salt dyeing method and ammonium oxalate extraction before and after removal of waxes. The scanning electron microscopy （SEM） and the Fourier transform infrared attenuated total reflectance spectroscopy （FTIR-ATR） analysis indicate that the model layer style provides the best correlation to the experimental results. The eutin in cotton fiber does not contain free pectin, and there is not any interpenetration, superposition and wrapping, but a rather clear interface between the cutin and the pectin. The cutin is on the outer layer, while the pectin is on the inner layer, which glues the waxy substances to the surface of the cellulose or hemicellulose.