The Swartzia species are commonly known as bloodwood due to the red exudate released from the stem after injury. This exudate has aroused great interest, and an integrative study is essential to describe it in detail. Thus, this work aimed to identify the red exudate’s secreting-site in S. flaemingii and S. langsdorffii, and determine if it is a latex or a resin. Samples of the stem bark and the secondary xylem were prepared for histological analysis. Fresh exudates were dissolved in deuterated methanol and analyzed by ¹H-NMR; other samples were resuspended in MeOH:H₂O (9:1), partitioned with organic solvents and analyzed by direct infusion mass spectrometry. Total phenolic and total flavonoid contents were determined spectrophotometrically, and antioxidant capacity was determined using ferric reducing antioxidant power assay. The results showed that the exudate is a red latex produced by articulated laticifers located among the phloem cells. The latex is composed of sucrose, catechin glucosides, chlorophyll derivatives, and hederagenin-type saponins. Both samples of S. flaemingii and S. langsdorffii presented high amounts of phenolics and flavonoids, as well as a strong antioxidant capacity. The anatomical study showed that the secreting-site of the Swartzia red exudates were laticifers. This finding allows us to exclude other substances such as resin or oleoresin, generally produced by secretory cavities or ducts. Furthermore, since laticifers are rare in Fabaceae, this finding is significant, and represents an essential taxonomic feature. The showy red color is due to the large amounts of flavonoids. This latex probably has a protective role against microorganisms and photodamage. The bioactive potential of this exudate inspires further studies, which may boost the economic importance of Swartzia.

 由于受伤后从茎中释放出红色渗出物，Swartzia物种 通常被称为血木。这种渗出物引起了极大的兴趣，必须进行综合研究才能对其进行详细描述。因此，这项工作旨在确定S. flaemingii 和 S. langsdorffii中红色渗出物的分泌位点 ，并确定它是乳胶还是树脂。制备茎皮和次生木质部样品用于组织学分析。将新鲜渗出液溶解在氘代甲醇中并通过¹ H-NMR 进行分析；其他样品重新悬浮在 MeOH:H _2中O (9:1)，用有机溶剂分配，并通过直接注入质谱法进行分析。总酚和总黄酮含量采用分光光度法测定，抗氧化能力采用铁还原抗氧化能力测定法测定。结果表明，渗出液是由位于韧皮部细胞间的铰接式乳管产生的红色乳胶。乳胶由蔗糖、儿茶素葡糖苷、叶绿素衍生物和常春藤素型皂苷组成。S. flaemingii 和 S. langsdorffii的两个样品都含有大量的酚类物质和类黄酮，以及很强的抗氧化能力。解剖学研究表明， Swartzia的分泌部位红色渗出物是乳管。这一发现使我们能够排除通常由分泌腔或导管产生的其他物质，例如树脂或油性树脂。此外，由于乳管在豆科植物中很少见，这一发现意义重大，代表了一个重要的分类学特征。艳丽的红色是由于含有大量的类黄酮。这种乳胶可能对微生物和光损伤具有保护作用。这种渗出物的生物活性潜力激发了进一步的研究，这可能会提高Swartzia的经济重要性。