Labeled content of two furanocoumarins in dietary supplements correlates with neither actual content nor CYP3A inhibitory activity

Karen M VanderMolen; Garrett R Ainslie; Mary F Paine; Nicholas H Oberlies

doi:10.1016/j.jpba.2014.05.038

Back

Labeled content of two furanocoumarins in dietary supplements correlates with neither actual content nor CYP3A inhibitory activity

Journal article

Open access

Peer reviewed

Labeled content of two furanocoumarins in dietary supplements correlates with neither actual content nor CYP3A inhibitory activity

Karen M VanderMolen, Garrett R Ainslie, Mary F Paine and Nicholas H Oberlies

Journal of pharmaceutical and biomedical analysis, Vol.98, pp.260-265

09/2014

DOI: https://doi.org/10.1016/j.jpba.2014.05.038

Handle:

https://hdl.handle.net/2376/105627

PMCID: PMC4180667

PMID: 24951959

Files and links (1)

url

https://doi.org/10.1016/j.jpba.2014.05.038View

Published (Version of record) Open

Abstract

Dietary supplement

Bergamottin

Furanocoumarin

Dihydroxybergamottin

Grapefruit juice

•A rapid validated method for the quantitation of two furanocoumarins was developed.•Bergamottin and 6′,7′-dihydroxybergamottin were quantified in dietary supplements.•Despite labeling claims, furanocoumarins were undetected in most supplements.•Supplements exhibited in vitro CYP3A inhibition despite low furanocoumarin content. Dietary supplements are a multi-billion dollar business, with yearly profit increases. Allegedly safe, these supplements are marketed to a variety of niches, encompassing claims from immune support to weight loss. Six sports nutrition supplements were acquired that were labeled to contain the furanocoumarin(s) bergamottin and/or 6′,7′-dihydroxybergamottin (DHB), both of which are potent irreversible inhibitors of the prominent drug metabolizing enzyme cytochrome P450 3A (CYP3A). Both furanocoumarins are typically present in grapefruit juice, which has been shown to inhibit intestinal CYP3A, perpetrating an increase in the systemic exposure of certain concomitant ‘victim’ drugs. The acquired supplements were analyzed using ultra-performance liquid chromatography coupled to both a photodiode array (PDA) detector and a triple quadrupole mass spectrometer (MS). Contrary to the product labeling, four of the supplements contained no detectable quantities of either furanocoumarin (LOD 0.060μg/capsule), while two of the supplements contained minimal amounts (one contained 12.13 (±0.23) μg bergamottin and 65.51 (±0.64) μg DHB per capsule; the other contained 2.705 (±0.069) μg bergamottin per capsule and no detectable quantities of DHB). A CYP3A inhibition bioassay was used to assess whether the actual content of the furanocoumarins correlated with CYP3A inhibitory activity. Despite the low amounts of bergamottin and DHB, CYP3A inhibition by the supplements was greater than could be accounted for by the two furanocoumarins. The additional activity suggests the presence of other potent or highly abundant CYP3A inhibitors.

Metrics

9 Record Views

Details

Title: Labeled content of two furanocoumarins in dietary supplements correlates with neither actual content nor CYP3A inhibitory activity
Creators: Karen M VanderMolen - Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, PO Box 26170, Greensboro, NC 27402, USA
Garrett R Ainslie - Washington State University, College of Pharmacy, PBS 341, PO Box 1495, Spokane, WA 99210-1495, USA
Mary F Paine - Washington State University, College of Pharmacy, PBS 341, PO Box 1495, Spokane, WA 99210-1495, USA
Nicholas H Oberlies - Department of Chemistry and Biochemistry, University of North Carolina at Greensboro, PO Box 26170, Greensboro, NC 27402, USA
Publication Details: Journal of pharmaceutical and biomedical analysis, Vol.98, pp.260-265
Academic Unit: Pharmaceutical Sciences, Department of
Publisher: Elsevier B.V
Identifiers: 99900547071701842
Language: English
Resource Type: Journal article