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Insoluble-Bound Phenolics in Food

Department of Biochemistry, Memorial University of Newfoundland, St. John’s, NL A1B 3X9, Canada
Author to whom correspondence should be addressed.
Academic Editors: Luis Cisneros-Zevallos and Daniel Jacobo-Velazquez
Molecules 2016, 21(9), 1216;
Received: 10 August 2016 / Revised: 31 August 2016 / Accepted: 5 September 2016 / Published: 11 September 2016
(This article belongs to the Special Issue Recent Advances in Plant Phenolics)
PDF [1545 KB, uploaded 20 September 2016]


This contribution provides a review of the topic of insoluble-bound phenolics, especially their localization, synthesis, transfer and formation in plant cells, as well as their metabolism in the human digestive system and corresponding bioactivities. In addition, their release from the food matrix during food processing and extraction methods are discussed. The synthesis of phenolics takes place mainly at the endoplasmic reticulum and they are then transferred to each organ through transport proteins such as the ATP-binding cassette (ABC) and multidrug and toxic compound extrusion (MATE) transporter at the organ’s compartment membrane or via transport vesicles such as cytoplasmic and Golgi vesicles, leading to the formation of soluble and insoluble-bound phenolics at the vacuole and cell wall matrix, respectively. This part has not been adequately discussed in the food science literature, especially regarding the synthesis site and their transfer at the cellular level, thus this contribution provides valuable information to the involved scientists. The bound phenolics cannot be absorbed at the small intestine as the soluble phenolics do (5%–10%), thus passing into the large intestine and undergoing fermentation by a number of microorganisms, partially released from cell wall matrix of foods. Bound phenolics such as phenolic acids and flavonoids display strong bioactivities such as anticancer, anti-inflammation and cardiovascular disease ameliorating effects. They can be extracted by several methods such as acid, alkali and enzymatic hydrolysis to quantify their contents in foods. In addition, they can also be released from the cell wall matrix during food processing procedures such as fermentation, germination, roasting, extrusion cooking and boiling. This review provides critical information for better understanding the insoluble-bound phenolics in food and fills an existing gap in the literature. View Full-Text
Keywords: bound phenolics; localization and transfer of phenolics; bioactivity; release from cell wall matrix bound phenolics; localization and transfer of phenolics; bioactivity; release from cell wall matrix

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Shahidi, F.; Yeo, J. Insoluble-Bound Phenolics in Food. Molecules 2016, 21, 1216.

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