Abstract
Limonoids represent a group of chemically related triterpenes found in the Rutaceae and Meliaceae. Bitterness due to limonoids in a variety of citrus juices is a major problem in the citrus industry. Among 38 limonoids isolated from Citrus and its hybrids, limonin, a bitter member of the group, occurs widely in citrus juices and is the major cause of the bitterness. Recently, limonoids have been shown to be present as glucoside derivatives in the Rutaceae1–6. These glucosides are one of the major secondary metabolites present in Citrus 7–9. Limonoids have also been found to possess biological activities, such as anticarcinogenic activity in laboratory animals10–12 and antifeedant activity against insects13–19. Recently, the biochemistry of limonoids in Citrus 20–21 and the removal of bitter limonoids from citrus juices by adsorption22–24 and biological means24–25 have been reviewed. This review summarizes the biosynthetic pathways of the major limonoids in Citrus and the alternative pathways occurring in Ichang Chie (C. ichangensis), sour orange (C. aurantium) and calamondin (C. reticulata x Fortunella sp). Also included is a review of the sites of biosynthesis in citrus tissues and information on when limonoids are biosynthesized during fruit growth and maturation.
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© 1992 Springer Science+Business Media New York
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Hasegawa, S., Herman, Z. (1992). Biosynthesis of Limonoids in Citrus . In: Petroski, R.J., McCormick, S.P. (eds) Secondary-Metabolite Biosynthesis and Metabolism. Environmental Science Research, vol 44. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-3012-1_21
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