竹笋采后涂膜保鲜对其木质化的影响

Effects of Coating Agent Treatment on Lignification Of Excised Bamboo Shoots

为了给竹笋采后保鲜和竹笋膳食纤维的加工提供理论指导,将采回的毛竹春笋的不同部位在3℃冷藏条件下,进行壳聚糖涂膜保鲜对竹笋中苯丙氨酸解氨酶(PAL)和过氧化物酶(POD)活性以及纤维素和木质素含量影响的研究.结果表明:从顶部到基部,竹笋各区段部位PAL和POD活性逐渐增强,纤维素和木质素含量增大;与对照相比,各种涂膜保鲜处理均显著降低竹笋的PAL和POD活性及纤维素和木质素的生成,加入亚硫酸钠能延缓竹笋的木质化进程.

In order to provide some theoretical guiding for the preservation of excised bamboo shoots and the processing of their edible cellulose, this paper made a study of the effects of coating agent treatment upon the activities of phenylalanine ammonia-lyase （PAL） and peroxidase （POD）, and the contents of cellulose and lignin, in excised bamboo shoots （Phyllostachys pubescens Mazel ex H. de Lehaie） by keeping their different parts at a low temperature （3 ℃ ）. The results show that from top to bottom, the PAL and POD activities of the shoots progressively increase and their contents of cellulose and lignin also accrete; that compared with the control, each coating agent treatment leads, without exception, to the decrease of the activities of PAL and POD, and of the formation of cellulose and lignin ; and that when the coating agent is supplemented with sodium sulfite, the process of lignification can be put off.