Polyphenols in Acacia mangium and Acacia auriculiformis heartwood with reference to heart rot susceptibility
Polyphenols in Acacia mangium and Acacia auriculiformis heartwood with reference to heart rot susceptibility
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DOI：
10.1007/s10086-005-0707-x
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发表时间：
2005-01-01
影响因子：
2.9
通讯作者：
Mohammed, CL
中科院分区：
文献类型：
--
作者：
Barry, KM;Mihara, R;Mohammed, CL
马占相思心材易发生心腐病，这是首次研究心材抽提物在其易感性中的作用。以大叶相思和大叶相思为对照。因为它很少与心脏腐烂有关。结果表明，两种植物心材提取物中主要含有3种黄酮类化合物（2，3-trans-3，4 '，7，8-tetrahydroxyflavanone，teracacidin和4'，7，8-trihydroxyflavanone），并通过核磁共振波谱对其进行了分离纯化和鉴定。后一种化合物在A. mangium和melacacidin的证据也是最近报道的。给出了这些化合物的质谱（MS）行为，例如，teracacidin不会通过电喷雾电离或大气压化学电离形成分子离子。金合欢单宁的性质进行了比较，白坚木单宁（组成的profisetinidins）使用氧化裂解，使MS检测，但获得了阴性反应，这表明金合欢单宁也可能是5-脱氧原花色素类型。黄烷酮的含量在A.马占木心材腐烂，但原花色素的量仅略微减少，因此这些化合物可能更能抵抗心腐真菌的降解。结果表明，A. auriculiformis是A. mangium，并且，虽然初步，这提供了酚类提取物在这些金合欢属物种的心腐抗性中所起作用的证据。
The heartwood of Acacia mangium is vulnerable to heart rot and this is the first study to investigate the role of heartwood extractives in its susceptibility. Acacia auriculiformis was compared with A. mangium because it is rarely associated with heart rot. The heartwood extracts of both species were dominated by three flavonoids (2,3-trans-3,4',7,8-tetrahydroxyflavanone, teracacidin, and 4',7,8,-trihydroxyflavanone), which were purified and identified by nuclear magnetic resonance spectroscopy. The latter compound has not been previously reported in A. mangium and evidence for melacacidin is also newly reported. The mass spectrometric (MS) behavior of these compounds is given, for example teracacidin does not form molecular ions by either electrospray ionization or atmospheric-pressure chemical ionization. The nature of Acacia tannins was compared to quebracho tannin (composed of profisetinidins) using oxidative cleavage to enable MS detection but a negative reaction was obtained for both, which suggests the Acacia tannins may also be of the 5-deoxy proanthocyanidin type. The concentration of flavanones was less when A. mangium heartwood was decayed but the amount of proanthocyanidins was only slightly reduced and therefore these compounds may be more resistant to degradation by heart rot fungi. We found that the total phenol content of A. auriculiformis was about fivefold that of A. mangium, and, while preliminary, this provides evidence for a role played by phenolic extractives in heart rot resistance of these Acacia species.