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2.3 Chemical Structure of Curcuminoids and Turmerones The chemical structure of the curcuminoids (curcumin, desmethoxy-curcumin: DMC and bis- desmethoxy-curcumin: BDMC) responsible for the yellow color characteristic in the oilresin of turmeric (Srinavasan, 1953 Govindarajan, 1980) and the turmerones (turmerone and ar-turmerone), the major compounds of turmeric essential oil, responsible for the flavor characteristic of turmeric (Alexander and Rao, 1973), are shown in Figure 1. HO H3CO HO HO O OH Curcumin O OH Desmethoxy-curcumin O OH Bis-desmethoxy-curcumin O OH OCH 3 OH OCH 3 OH Turmerone Figure.1: Chemical structure of curcuminoids (Srinavasan, 1953 Govindarajan, 1980). and turmerones (Alexander and Rao, 1973). ar-Turmerone OPDF Image | SUPERCRITICAL CO2 EXTRACTION OF CURCUMINS
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