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1. A liquid food wherein said liquid food has a shelf life extender at a concentration of 1 ppb to 10% wherein said shelf life extender is selected from the group consisting of an isothiocyanate selected from the group consisting of: methyl isothiocyanate, benzyl isothiocyanate, isopropyl isothiocyanate, isobutyl isothiocyanate, propyl isothiocyanate, benzoyl isothiocyanate, cyclohexyl isothiocyanate, ethyl isothiocyanate, butyl isothiocyanate, fluorescein isothiocyanate), ethoxycarbonyl isothiocyanate, phenyl isothiocyanate, phenyl isothiocyanate, 3-iodophenyl isothiocyanate, 4-chlorophenyl isothiocyanate, 2-phenylethyl isothiocyanate, 3-bromophenyl isothiocyanate, fluorescein 5-isothiocyanate, 3-pyridyl isothiocyanate, 1-adamantyl isothiocyanate, 1-naphthyl isothiocyanate, 2-methoxyphenyl isothiocyanate, 4-nitrophenyl isothiocyanate, 4-methoxyphenyl isothiocyanate, fluorescein isothiocyanate dextran, 4-bromophenyl isothiocyanate, fluorescein 6-isothiocyanate, 2-chlorophenyl isothiocyanate, 4-cyanophenyl isothiocyanate, 4-fluorophenyl isothiocyanate, 2-fluorophenyl isothiocyanate, 3-fluorophenyl isothiocyanate, 2-chloroethyl isothiocyanate, 3,4-dimethoxyphenyl isothiocyanate, 2,4-difluorophenyl isothiocyanate, 4-(trifluoromethyl) phenyl isothiocyanate, 2-(trifluoromethyl) phenyl isothiocyanate, 3,4-dichlorophenyl isothiocyanate, 3-(trifluoromethyl) phenyl isothiocyanate, 3,5-dimethylphenyl isothiocyanate, 3-(methylthio) propyl isothiocyanate, 4-(trifluoromethoxy) phenyl isothiocyanate, 2,4-dimethylphenyl isothiocyanate, 3,4-difluorophenyl isothiocyanate, 2,4-dimethoxyphenyl isothiocyanate, 2,3-dichlorophenyl isothiocyanate, 2,4-dichlorophenyl isothiocyanate, sec-butyl isothiocyanate, n-octyl isothiocyanate, 4-penten-1-yl isothiocyanate, p-tolyl isothiocyanate, o-tolyl isothiocyanate, 3-buten-1-yl isothiocyanate, 4-dimethylamino-1-naphthyl isothiocyanate, 4-(dimethylamino) azobenzene 4′-isothiocyanate, m-tolyl isothiocyanate, 2,4,6-trimethylphenyl isothiocyanate, 3,5-bis(trifluoromethyl) phenyl isothiocyanate, 4-tert-butylphenyl isothiocyanate, 5-fluoro-o-tolyl isothiocyanate, 2,3,4,6-tetra-o-benzoyl-β-d-glucopyranosyl isothiocyanate, 2,3,4,6-tetra-o-acetyl-β-d-glucopyranosyl isothiocyanate, 4-isothiocyanato-2-(trifluoromethyl) benzonitrile, ethyl isothiocyanatoacetate, dansylamino-pitc, dl-sulforaphane, isothiocyanatocyclopropane, 1-isothiocyanato-3-nitrobenzene, 1,3-diisopropyl-2-isothiocyanatobenzene and erucin; a boronic acid, a non-aromatic cyclic ketone, a chelate ligand or their precursor, or mixtures thereof as a shelf-life extender wherein said liquid food is a liquid, semi-solid or gel selected from the group consisting of milk, yogurt, liquid food thickener, fruit and vegetable juices, extracts of fresh and dried herbs, soft drinks, and alcoholic drinks.
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