Table 2

Concentration of 6′,7′-dihydroxybergamottin in grapefruit juice from various sources

ProductNMean Conc. (μM)Range (μM)
Florida white grapefruit commercially squeezed (Tropicana Golden)528.515.3–43.3
Florida white grapefruit fresh squeezed by hand923.114.0–33.6
Florida pink grapefruit commercially squeezed (Tropicana Ruby Red)512.910.8–14.5
Florida pink grapefruit fresh squeezed by hand816.41.4–45.2
Texas Rio Star Grapefruit fresh squeezed by hand519.64.6–30.9
Frozen concentrated grapefruit juice reconstituted (various brands)644.433.1–58.4
  • The concentration of 6′,7′-dihydroxybergamottin was determined by HPLC in methylene chloride extracts of commercially prepared grapefruit juices and juices hand squeezed from fruits obtained at local markets.N = number of different lots (commercially squeezed juices), sources of fruit (fresh squeezed juices), or brands (frozen concentrate).