Department of Food Chemistry and Phytochemistry, Karlsruhe Institute of Technology (KIT), Adenauerring 20A, 76131 Karlsruhe, Germany.
J Agric Food Chem. 2022 Sep 21;70(37):11704-11714. doi: 10.1021/acs.jafc.2c03782. Epub 2022 Sep 12.
Flavonoid based proanthocyanidins and cinnamyl alcohol based lignins are chemically complex phenolic oligomers/polymers that are found in food plants. Although structurally very different, these two biopolymers are often not distinguished, for example, in the (quantitative) compositional analysis of cell walls and dietary fiber. Here, we analytically distinguish lignin and proanthocyanidins in dietary fiber samples by using degradative and nondegradative techniques and provide information about their occurrence, abundance, and structural characteristics in seeds of chokeberries, cranberries, raspberries, red currants, and grapes. These data revealed that the seeds of botanically diverse fruits largely differ in terms of their phenolic fiber polymers. The mostly hardened tissue of the seeds is not necessarily based on lignified cell walls. For example, red currant and chokeberry seeds almost exclusively contain proanthocyanidins, and raspberry seeds were clearly lignified (G-H-lignin) but did not contain proanthocyanidins. Our data also allows for estimating the bias of proanthocyanidins on different approaches of lignin analysis.
基于类黄酮的原花青素和肉桂醇基木质素是存在于植物性食物中的化学结构复杂的酚类低聚物/聚合物。尽管在结构上有很大的不同，但这两种生物聚合物通常没有被区分，例如在细胞壁和膳食纤维的（定量）组成分析中。在这里，我们通过使用降解和非降解技术在膳食纤维样品中分析木质素和原花青素，并提供其在越橘、蔓越橘、树莓、红醋栗和葡萄种子中的存在、丰度和结构特征的信息。这些数据表明，在酚类纤维聚合物方面，不同植物科的水果种子存在很大差异。种子的大部分硬化组织不一定基于木质化的细胞壁。例如，红醋栗和黑加仑种子几乎只含有原花青素，而覆盆子种子明显木质化（G-H-木质素）但不含有原花青素。我们的数据还可以估计在木质素分析的不同方法中对原花青素的偏差。
