摘要
4月份出笋期挖取毛竹春笋和高节竹笋,测定了笋体从基部向顶部0、5、10、15、20、25cm各位段的苯丙氨酸解氨酶(PAL)和过氧化物酶(PO)活性,以及纤维素和木质素含量。竹笋在25℃放置96h自然老化,测定了24、48、72、96h,5、10、15、20、25cm各位段的苯丙氨酸解氨酶和过氧化物酶活性,以及10cm位段24、48、72、96h纤维素和木质素含量的变化。结果表明:PAL和PO活性以及纤维素和木质素的含量从基部向顶部逐渐降低,呈梯形分布,木质化进程是从基部向顶部推进的;竹笋离体后,PAL和PO活性大幅度增高,纤维素和木质素含量大量增加加速了老化进程。讨论了PAL和PO在竹笋老化过程中的活性变化,及其在竹笋老化过程中的作用。
The activities of phenylalanine ammonialyase (PAL) and peroxidase (PO) and contents of cellulose and lignin in new digging bamboo shoot of phyllostachys pubescens and P. prominens were measured. The PAL and PO activities were progressively reduced from shoot base to top. contents of cellulose and lignin decreased from base to top. Bamboo shoots were placed at 25 ℃ for 4 day in room. The changes in PAL and PO activity and in cellulose and lignin contents were studied. The results indicated that the activities in PAL and PO and contents in cellulose and lignin increased by a big margin, and the course of lignification was moved forward from shoot base to top. Lignification resulted in loss of edibility.
出处
《林业科学研究》
CSCD
北大核心
2002年第6期687-692,共6页
Forest Research
基金
2001 2003年国家攻关项目"竹副产品加工技术研究