ARC Centre of Excellence in Plant Cell Walls, Centre for Nutrition and Food Sciences, Queensland Alliance for Agriculture and Food Innovation, The University of Queensland, St. Lucia, QLD 4072, Australia.
Food Chem. 2012 Dec 15;135(4):2287-92. doi: 10.1016/j.foodchem.2012.07.004. Epub 2012 Jul 11.
Bacterial cellulose and cellulose-pectin composites were used as well-defined model plant cell wall (PCW) systems to study the interaction between phenolic acids (PA) derived from purple carrot juice concentrate (PCJC) and PCW components. Significant PA depletion from solution occurred, with pure cellulose initially (30s-1h) absorbing more than cellulose-pectin composites in the first hour (ca 20% cf 10-15%), but with all composites absorbing similar levels (ca 30%) after several days. Individual PAs bound to different relative extents with caffeic acid>chlorogenic acid>ferulic acid. Extrapolation of data for these model systems to carrot puree suggests that nutritionally-significant amounts of PAs could bind to cell walls, potentially restricting bioavailability in the small intestine and, as a consequence, delivering PAs to the large intestine for fermentation and metabolism by gut bacteria.
细菌纤维素和纤维素-果胶复合材料被用作明确定义的植物细胞壁（PCW）模型系统，以研究源自紫胡萝卜汁浓缩物（PCJC）的酚酸（PA）与 PCW 成分之间的相互作用。溶液中的 PA 大量耗尽，在最初的 30 秒至 1 小时内，纯纤维素（ca 20% cf 10-15%）比纤维素-果胶复合材料吸收的更多，但所有复合材料在几天后吸收的水平相似（ca 30%）。不同的 PA 与咖啡酸、绿原酸、阿魏酸结合的程度不同，阿魏酸>绿原酸>咖啡酸。将这些模型系统的数据外推到胡萝卜泥中表明，大量有营养意义的 PA 可能与细胞壁结合，从而限制其在小肠中的生物利用度，并因此将 PA 输送到大肠，由肠道细菌进行发酵和代谢。
