Pectic Arabinans in Quinoa Seeds (Chenopodium quinoa Willd.) Are Acylated with p-Coumaric Acid

摘要

A modified digestion method was used to hydrolyze large amounts of quinoa meal to study polysaccharide-bound phenolic acids. Besides the well-characterized oligosaccharide Omicron-(2-Omicron-trans-feruloyl-alpha-L-arabinofuranosyl)-(1 -> 5)-L-arabinofuranose, Omicron-(2-Omicron-trans-coumaroyl-alpha-L-arabinofuranosyl)-(1 -> 5)-L-arabinofuranose was isolated from the hydrolysate and identified by LC-MS, GC-MS, and NMR experiments. This study demonstrates for the first time that p-coumaric acid can be linked to pectic side chains of dicotyledonous plants.