Iridoids

Iridoids are found in advanced dicotyledonous plants; saffron (Crocus sativus L.) and cape jasmine fruit (Gardenia jasminoids Ellis) are the best-known iridoid-containing plants. However, a large number of iridoid compounds have been identified from different sources. Iridoids are not considered to have particular relevance as food colorants. However, their range of colors goes from green to yellow; thus, iridoids may produce red and blue colors. In addition, their stability has attracted the attention of food formulators. The structures of gardenia iridoids are shown in Figure 9.10; geniposide is the main constituent. Geniposidic acid has been prepared

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