杨梅不同部位单宁含量与结构研究  

Content and Structure of Tannins in Different Parts of Bayberry (Myrica rubra (Lour.) Sieb. et Zucc.)

作　　者：李敏[1] 向平[1] 杨志伟[1] 向成[1] 林鹏[1] 林益明[1] 

机构地区：[1]厦门大学生命科学学院,福建厦门361005

出　　处：《林产化学与工业》2008年第3期55-60,共6页Chemistry and Industry of Forest Products

基　　金：国家自然科学基金(40376026;30671646);教育部新世纪优秀人才支持计划(NCET-07-0725)

摘　　要：对杨梅的叶、枝和树皮的总酚含量与可溶缩合单宁含量进行了测定,并利用基质辅助激光解吸附飞行时间质谱(MALDI-TOFMS)详细研究了不同部位中缩合单宁的类型、聚合度及聚合物的分布情况。结果表明:树皮的总酚含量最高(43.56%),叶次之(34.69%),枝最低(18.53%);树叶的可溶缩合单宁含量最高(25.67%),皮次之(17.93%),枝最低(8.01%);3组分的缩合单宁都以(表)棓儿茶素-3-O-棓酸酯(EGCG/GCG)为基本结构单元的原翠雀定,且大部分聚合物的结构单元之间存在A型和B型两种连接方式,但其中叶和枝缩合单宁的聚合度要大于树皮。Contents of total phenolics and extractable condensed tannins in leaves, branches and bark of Myrica rubra （ Lour. ） Sieb. et Zucc. were determined. In addition, type of condensed tannins, degree of polymerization and distribution of polymer were characterized by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry （MALDI-TOF MS）. The results were showed as follows ： total phenolics content was the highest in bark （43.56 % ）, followed by leaves （34.69 % ）, and then branches（18.53 % ）; while extractable condensed tannins content was the highest in leaves （25.67 % ）, followed by bark （ 17.93 % ） , and then branches （ 8. O1% ）. Epigallocatechin-3-O-gallate was invariably the basic unit occurring in the three condensed tannins. A-type and B-type linkages were the common types among the structural units of polymers. Meanwhile tannins in leaves and branches had the larger highest polymerization degree than bark.

关 键 词：杨梅 多酚 缩合单宁 基质辅助激光解吸附飞行时间质谱 多聚物 

分 类 号：TQ943.2[化学工程]