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Vanillin.

Abstract：

:Vanillin (4-hydroxy-3-methoxybenzaldehyde) is an important flavour and aroma molecule, but is also of interest because of its biogenetic relationship to the phenylpropanoid pathway and to other molecules of physiological significance, notably salicylate. Recent progress towards characterisation of the biosynthesis of vanillin is reviewed. In Vanilla, there is some evidence that the route to vanillin-beta-D-glucoside may proceed from 4-coumaric acid via 4-hydroxybenzaldehyde, with glucoside formation occurring not necessarily as the final step, and possibly with the involvement of 4-hydroxybenzyl alcohol beta-D-glucoside tartrate bis-esters as "shunt" metabolites. This appears to be given tentative support by the recent partial characterisation of a 4-hydroxybenzaldehyde synthase from Vanilla. On the other hand, a well-characterised, CoA-dependent, non-oxidative chain-shortening mechanism to produce vanillin from ferulic acid, occurring as part of a pathway of hydroxycinnamate degradation in Pseudomonas, may not be representative of hydroxycinnamate chain-shortening mechanism(s) occurring in Vanilla and other plants. Nevertheless, by expression of the Pseudomonas enzyme 4-hydroxycinnamoyl-CoA hydratase/lyase (HCHL), attempts have been made to introduce a direct capacity for vanillin formation into model plants by diversion of the phenylpropanoid pathway. The results obtained have emphasised the obstacles to achieving the desired oxidation level (aldehyde) and ring substitution (4-hydroxy-3-methoxyphenyl), even when a substantial metabolic diversion is successfully achieved. Finally, the significance of the latest biosynthetic and biotechnological developments is reviewed briefly in relation to authentication of vanillin.

journal_name

Phytochemistry

journal_title

Phytochemistry

authors

Walton NJ,Mayer MJ,Narbad A

doi

10.1016/s0031-9422(03)00149-3

subject

Has Abstract

pub_date

2003-07-01 00:00:00

pages

505-15

issue

5

eissn

0031-9422

issn

1873-3700

pii

S0031942203001493

journal_volume

63

pub_type

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