Abstract
Citral (3, 7-dimethyl-2, 6-octadienal)was hydro distilled from lemon grass and 3, 7-dimethyl-2, 6-octadienal acetals (Citral acetals) were synthesized from it. The latter was redistilled under vacuum and collected fractions at constant temperature. Para toluene sulphonic acid catalyst was used for the preparation of citral ethylene glycol acetal and citral propylene glycol acetal which are used in perfumery, flavor, for fortifying lemon oil. GC, IR of synthesized product is recorded and graphs were determined.
Highlights
Citral is present in several plant oils like lemon myrtle, Litsea citrata, lemon grass, lemon tea tree, Ocmum gratissimum and lemon balm etc., [1]
Citral is used as a flavour and for fortifying lemon oil
Lemon grass leaves were obtained from PCSIRBotanical garden and dried under shade for two days and cut into small pieces for distillation
Summary
Citral is present in several plant oils like lemon myrtle, Litsea citrata, lemon grass, lemon tea tree, Ocmum gratissimum and lemon balm etc., [1]. The E-isomer is known as geranial or citral A. The Z-isomeris known as neral or citral B [3] (Figure 1). Commercial Citral, invariably, is a mixture of two isomers due to cis–trans isomerism at the C=C bond nearly the aldehyde group obtained from essentials oils of plant sources. Citral is used as a flavour and for fortifying lemon oil. It has strong anti-microbial qualities [4] and pheromonal effects in insects [5]. Citrals are basic intermediate for synthesis of flavouring and fragrance components such as Ionones, methyl ionones and vitamins A and E [6,7]
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