Laurel tree (Laurus nobilis L.) wood is a byproduct of the pruning of this tree widely cultivated for its aromatic leaves. The phenolic composition of laurel wood has not been reported yet. The aim of this work was to study the phenolic profile of an ethyl acetate extract of laurel wood in order to know its potential as a source of antioxidants and valuable compounds. Three flavan-3-ols, 4 dimeric B-type proanthocyanidins, and 2 trimeric A-type procyanidins were isolated by preparative column chromatography and semi-preparative HPLC, using a fast online post-column radical scavenging detection technique as guidance. All isolated compounds were fully characterized by spectroscopic (NMR, IR, UV) and spectrometric (MS) techniques. In addition, 17 minor proanthocyanidins were tentatively identified by liquid chromatography coupled to mass spectrometry (HPLC–ESI–MS). The extract was dominated by the presence of cinnamtannin B-1, a bioactive trimeric A-type procyanidin reported as a strong antioxidant of commercial value. According to the chemical composition found, it can be concluded that laurel wood is a renewable source of potential bioactive phenolic compounds.

中文翻译：

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月桂木中的酚类化合物：原花青素的新来源

月桂树 (Laurus nobilis L.) 木材是这种树修剪后的副产品，因其叶子芳香而广泛种植。月桂木的酚类成分尚未见报道。这项工作的目的是研究月桂木乙酸乙酯提取物的酚类成分，以了解其作为抗氧化剂和有价值化合物来源的潜力。以快速在线柱后自由基清除检测技术为指导，通过制备型柱色谱和半制备型 HPLC 分离出三种黄烷-3-醇、4 种二聚体 B 型原花青素和 2 种三聚体 A 型原花青素。通过光谱（NMR、IR、UV）和光谱（MS）技术对所有分离的化合物进行了充分表征。此外，通过液相色谱-质谱联用 (HPLC-ESI-MS) 初步鉴定了 17 种次要的原花青素。该提取物主要是肉桂单宁 B-1，一种生物活性三聚体 A 型原花青素，据报道是一种具有商业价值的强抗氧化剂。根据发现的化学成分，可以得出结论，月桂木是潜在生物活性酚类化合物的可再生来源。