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The transfer of auxins to cultures of organisms that could be used to produce food colors was studied by radiochemical techniques. In all cases, cells producing pigments were selected for the studies. Cells of Phytolacca americana and Glycyrrhiza glabra were incubated with [2-14C] -2, 4-dichlorophenoxyacetic acid (2, 4-D) for 72hr and 33 days, respectively. Cells of Rubia tinctorum were incubated with [2-14C] indole-3-acetic acid (IAA) for 20 days. Distributions of radioactivity following the incubation of cultured cells were studied. The results may be summarized as follows.1) The uptake of 2, 4-D was faster than that of IAA.2) Even in the long-term studies, more than 40% of radioactivity derived from auxins remained in the tissues, though the proportion of metabolites increased.3) IAA was metabolized faster than 2, 4-D and a considerable amount of IAA metabolites was transferred to the cell residual fractions.4) Intracellular 2, 4-D or IAA is extracted with the solvent which is usually used for the extraction of the pigments.5) Since the extract of pigments contained auxins and their metabolites, it would be necessary to purify the extract before utilizing the pigments as food colors.

shokuhin eiseigaku zasshi/shokuhin eiseigaku zasshi

Uptake and Accumulation of Natural and Synthetic Auxins in Cultured Cells of Plants: Phytolacca americana L., Glycyrrhiza glabra L. and Rubia tinctorum L..