Laboratory of Natural Products, Institute of Bioscience, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
Department of Food Science, Faculty of Food Science and Technology, Universiti Putra Malaysia, 43400 Serdang, Malaysia.
Molecules. 2017 Sep 25;22(10):1612. doi: 10.3390/molecules22101612.
Gaharu (agarwood, Lamk.) is a valuable tropical rainforest product traded internationally for its distinctive fragrance. It is not only popular as incense and in perfumery, but also favored in traditional medicine due to its sedative, carminative, cardioprotective and analgesic effects. The current study addresses the chemical differences and similarities between gaharu samples of different grades, obtained commercially, using ¹H-NMR-based metabolomics. Two classification models: partial least squares-discriminant analysis (PLS-DA) and Random Forests were developed to classify the gaharu samples on the basis of their chemical constituents. The gaharu samples could be reclassified into a 'high grade' group (samples A, B and D), characterized by high contents of kusunol, jinkohol, and 10-epi-γ-eudesmol; an 'intermediate grade' group (samples C, F and G), dominated by fatty acid and vanillic acid; and a 'low grade' group (sample E and H), which had higher contents of aquilarone derivatives and phenylethyl chromones. The results showed that ¹H- NMR-based metabolomics can be a potential method to grade the quality of gaharu samples on the basis of their chemical constituents.
沉香（agarwood，Lamk.）是一种具有国际交易价值的热带雨林产品，因其独特的香味而备受追捧。它不仅是香薰和香水的热门原料，还因其具有镇静、化积、心脏保护和镇痛作用而受到传统医学的青睐。本研究使用基于 1H-NMR 的代谢组学方法，研究了不同等级的沉香样品之间的化学差异和相似性。基于化学组成，建立了偏最小二乘判别分析（PLS-DA）和随机森林两种分类模型，对沉香样品进行分类。这些沉香样品可以根据其化学组成重新分为“高等级”组（样品 A、B 和 D），其特征是含有较高的库苏诺尔、金霍醇和 10-表-γ-桉叶醇；“中等级”组（样品 C、F 和 G），以脂肪酸和香草酸为主；“低等级”组（样品 E 和 H），则含有较高的沉香呋喃衍生物和苯乙基色酮。结果表明，基于 1H-NMR 的代谢组学可以作为一种潜在的方法，根据其化学组成对沉香样品进行质量分级。
