Английская Википедия:Grapefruit seed extract
Шаблон:Short description Шаблон:Distinguish Grapefruit seed extract (GSE), also known as citrus seed extract, is a liquid extract derived from the seeds, pulp, and white membranes of grapefruit.[1] GSE is prepared by grinding the grapefruit seed and juiceless pulp, then mixing with glycerin.[1] Commercially available GSEs sold to consumers are made from the seed, pulp, and glycerin blended together.[1] GSE is sold as a dietary supplement and is used in cosmetics.[2]
Grapefruit history
The grapefruit is a subtropical citrus tree grown for its fruit which was originally named the "forbidden fruit" of Barbados.[3] The fruit was first documented in 1750 by Rev. Griffith Hughes when describing specimens from Barbados.[4] All parts of the fruit can be used. The fruit is mainly consumed for its tangy juice.[5] The peel can be processed into aromatherapy oils[6] and is also a source of dietary fiber.[7] The seed and pulp, as byproducts of the juice industry, are retrieved for GSE processing[8] or sold as cattle feed.[9]
Efficacy
Despite claims that GSE has antimicrobial effects,[10] there is no scientific evidence that GSE has such properties.[11][8] Some evidence indicates that the suspected antimicrobial activity of GSE was due to the contamination or adulteration of commercial GSE preparations with synthetic antimicrobials or preservatives.[1][2][12] These chemicals were not present in grapefruit seed extracts prepared in the laboratory, and GSE preparations without the contaminants were found to possess no detectable antimicrobial effect.[1] Although citrus seed extract is sold in health food markets,[12] there is no good evidence for any antimicrobial activity.[1]
Phytochemicals
Analysis shows the phytochemicals of the seed extract and pulp are flavonoids,[13][14] ascorbic acid (vitamin C), tocopherols, citric acid, limonoids,[15][16] sterols, and minerals.[17]
Preparations
GSE is prepared by grinding the grapefruit seed and juiceless pulp, then mixing with glycerin.[1] Commercially available GSE is made from the seed, pulp, glycerin, and synthetic preservatives all blended together.[1]
Health claims and safety concerns
Although various health claims for using GSE are marketed in the dietary supplement industry, there is no scientific evidence from high-quality clinical research that it has any health effects, as of 2018.[8][11] Phytochemicals in grapefruit seeds, particularly furanocoumarins and flavonoids, may cause adverse effects on health resulting from grapefruit–drug interactions that influence the intended therapeutic effects of some 85 prescription drugs.[11][18] The main safety concern about GSE is inhibition of the liver enzyme, cytochrome P450, which controls liver metabolism of drugs; consequently, its inhibition by GSE unpredictably increases the blood concentrations of prescribed drugs.[18]
References
- ↑ 1,0 1,1 1,2 1,3 1,4 1,5 1,6 1,7 Шаблон:Cite journal
- ↑ 2,0 2,1 Шаблон:Cite journal
- ↑ Шаблон:Cite book
- ↑ Michael Quinion. World Wide Words: Questions & Answers; Grapefruit. 2009.
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite book
- ↑ Шаблон:Cite journal
- ↑ 8,0 8,1 8,2 Шаблон:Cite web
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ 11,0 11,1 11,2 Шаблон:Cite web
- ↑ 12,0 12,1 Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ Шаблон:Cite journal
- ↑ 18,0 18,1 Шаблон:Cite journal
