Phenylpropanoids definition

As a result, these authors proposed in 1997 a new definition based on the metabolic origin of these substances. Concerning the plant phenols, and consequently the flavonoids, it may be considered as those compounds originating in the shikimate and phenylpropanoid pathways Notwithstanding, the flavonoids, as a differentiate subgroup inside the phenolic compounds, show a characteristic metabolic intermediate, the naringeninchalcone, from which all the bioflavonoids originate. 

While the results of the growth reversal experiments in the "supercomplex systems" described above had stimulated investigations at the level of "defined systems" (i.e. the examination of certain metabolic reactions in cell-free systems), no definitive answers as to the biochemical mode of action of glyphosate had been obtained. Based on our experience with inhibitors of phenylalanine ammonia-lyase (see below), we included the "complex system" level (i.e. the examination of a metabolic pathway jsi vivo) in our strategy in order to define the limits more closely. Hypocotyls from etiolated buckwheat seedlings provided a system in which the rapid synthesis of phenylalanine-derived products, such as anthocyanin and other phenylpropanoid compounds, can be very simply induced by illumination. Anthocyanins, in particular, can be conveniently extracted and quantified and, at least in buckwheat, are not subject to measurable turnover within... 

Lignans are a widespread class of phenylpropanoid metabolites, which according to our definition, can be linked via a large number of different coupling modes (e.g., 8,8 8,5 etc.). 

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