Chemical constituents and mechanisms of discoloration of Taiwania (Taiwania cryptomerioides Hayata) heartwood -: 1.: The structure reconfirmation and conversion mechanism of taiwanin A

被引:30
作者
Chang, ST
Wang, SY
Su, YC
Huang, SL
Kuo, YH
机构
[1] Natl Taiwan Univ, Dept Forestry, Taipei 10764, Taiwan
[2] Taiwan Forestry Res Inst, Taipei, Taiwan
[3] Natl Taiwan Univ, Dept Chem, Taipei 10764, Taiwan
关键词
Taiwania cryptomerioides; color substances; taiwanin A; conversion mechanism; taiwanin C; taiwanin E;
D O I
10.1515/HF.1999.023
中图分类号
S7 [林业];
学科分类号
0829 ; 0907 ;
摘要
One of the color substances, taiwanin A, was isolated from Taiwania (Taiwania cryptomerioides Hayata) heartwood. According to the C-13-NMR, H-1-NMR, HSQC, HMBC, and NOE difference spectroscopy analyses, the diene structure of taiwanin A was reconfirmed to be the trans-trans formulation. In addition, it was proven that deep orange crystalline taiwanin A changed to white and pare yellow compounds, taiwanin C and taiwanin E, after light irradiation. The conversion mechanism of taiwanin A into taiwanin C and taiwanin E is also proposed and discussed in this study.
引用
收藏
页码:142 / 146
页数:5
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