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- W18034537 abstract "Caffeic acid (3,4-dihydroxycinnamic acid) has been found in numerous plant species and tissues since its original isolation from coffee in 1867 [1–3]. Although the free acid occurs sometimes in small amounts, most commonly caffeic acid has been isolated as a conjugate (ester, amide or glycoside) and, as such, is a member of a large and varied family of hydroxycinnamoyl conjugates which also includes p-coumaric and ferulic acid derivatives. A unique feature of the caffeoyl derivatives is the ease with which the dihydroxyphenyl moiety can be oxidized to a reactive ortho-quinone species either through spontaneous air oxidation or enzyme (polyphenol oxidase) catalysis [4]. Ortho-quinones will react rapidly with nucleophiles such as thiol or amino functions on polypeptides, or with other dihydroxyphenyl units, to form covalently linked products. The impact of caffeoyl oxidation on protein structure and the ubiquitous distribution of hydroxycinnamoyl esters and amides in the plant kingdom have led to the suggestion that these compounds may be part of a pre-existing chemical defence system in plant cells. In the hypersensitivity response, mobilization of the system would involve either passive or active release of stored phenolic derivatives from the vacuolar storage compartment as a result of some challenge to the cell’s integrity, followed by oxidation of the released compounds. While this response would ultimately be suicidal for the challenged cell, it is proposed that it would also deter advance of a pathogenic organism [5]." @default.
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- W18034537 date "1985-01-01" @default.
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- W18034537 title "Metabolism of Caffeoyl Derivatives in Plant Cell Cultures" @default.
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- W18034537 doi "https://doi.org/10.1007/978-3-642-70717-9_16" @default.
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