Phenolic Acids in Jerusalem Artichoke ( L.): Plant Organ Dependent Antioxidant Activity and Optimized Extraction from Leaves.

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ID: 43065
2019
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Abstract
Phenolic acids including chlorogenic acids are major polyphenolic compounds found in Jerusalem artichoke ( L.). The plant itself is an emerging biorefinery crop due to the inulin-rich tubers, a bioethanol feedstock, but the aerial parts represent a rich source of bioactive compounds. We have determined the level of major phenolic acids in extracts of four plant organs: tuber, leaf, flower, and stem. Employing three heating conditions (20 °C, 60 °C, and microwaving), corrected total phenolic content (TPC) was highest in the leaves (4.5-5.7 mg gallic acid equivalents g dry substance), followed by flower (2.1-2.9), tuber (0.9-1.4), and lowest in stem extracts (0.1-0.2). A previously overlooked interference of the Folin-Ciocalteu assay, namely a signal contribution from ascorbic acid, caused overestimation of TPC in various organs ranging from 65% to 94%. Radical scavenging activity of extracts correlated significantly with TPC, both on corrected (R = 0.841) and uncorrected (R = 0.884) values. Out of the identified phenolic acids determined by quantitative HPLC-UV analysis, chlorogenic and dicaffeoylquinic acids accounted for 72-82% of corrected TPC in leaf and tuber extracts. Optimization of leaf extraction was tested in a 2-factorial Central Composite Face (CCF) design. Temperature was the most important model term, and a solvent strength of less than 50% ethanol promoted the highest TPC yields. Further developments in extraction processing of crop residues may open avenues for improving the utilization of Jerusalem artichoke in valuable products.
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showkat2019phenolicmolecules Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Showkat, Muhammad Mir;Falck-Ytter, Anne Bergljot;Strætkvern, Knut Olav;
Journal molecules
Year 2019
DOI
E3296
URL
Keywords
antioxidant activity ascorbic acid total phenolic content yield jerusalem artichoke chlorogenic acid

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