title: Screening of furanocoumarin derivatives in citrus fruits by enzyme-linked immunosorbent assay.
abstract: This paper reports a sensitive and specific enzyme-linked immunosorbent assay for screening of furanocoumarin derivatives as cytochrome P450 3A4 inhibitors in citrus fruits. Anti-6',7'-dihydroxybergamottin antibody was obtained by immunizing rabbits with 6',7'-dihydroxybergamottin conjugated with bovine serum albumin using the N-succinimidyl ester method. An enzyme marker was similarly prepared by coupling 6',7'-dihydroxybergamottin with beta-D-galactosidase. The enzyme-linked immunosorbent assay is capable of detecting as little as 800 pg/ml of 6',7'-dihydroxybergamottin and 4 ng/ml of bergamottin. Cross-reactivity data showed that the antibody well recognizes both the furanocoumarin and 6,7-dihydroxy-3,7-dimethyloct-2-enyloxy moieties of the 6',7'-dihydroxybergamottin, and is thus specific to the structure of furanocoumarin derivatives containing geranyloxy side chain as the cytochrome P450 3A4 inhibitors in grapefruit juice. The antibody was, therefore, used for screening a large number of citrus fruits for furanocoumarin derivatives such as 6',7'-dihydroxybergamottin. Fifteen citrus fruits were examined and significant reactivity was observed in 8 of these: red pummelo, sweetie, melogold, banpeiyu pummelo, hassaku, sour orange, lime and natsudaidai. This enzyme-linked immunosorbent assay may be a powerful tool for screening for furanocoumarin derivatives as cytochrome P450 3A4 inhibitors in grapefruit juice.
authors.affiliation: Department of Pharmacy, Saga University Hospital, Japan. saita@post.saga-med.ac.jp
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Saita
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Fujito
authors.forename: Masato
authors.initials: M
authors.lastname: Mori
mesh_terms: D001628:Beverages / Q000032:analysis*; D002957:Citrus / Q000201:enzymology*; D004305:Dose-Response Relationship, Drug; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods; D005638:Fruit / Q000201:enzymology*; D011564:Furocoumarins / Q000737:chemistry / Q000302:isolation & purification*
chemical_list: D011564:Furocoumarins