Purpose: Passionflower has long been widely used as a herbal therapy for mental and neurological disorders. Passionflower has mild hypnotic, sedative and anti-anxiety properties, and has been used to relieve hysteria/neurosis and alleviate/resolve insomnia. In Western Europe, Passionflower is still widely used in phytotherapy today. In 2000, Passionflower was listed in European Pharmacopoeia (EP) and British Pharmacopoeia (BP), and its standards and test methods were specified. Therefore, this time, the author investigates the specifications and test methods of the passive flora listed in EP and BP. The chemical and pharmacologically/biologically active effects of various C-glycosylflavone components contained in Passionflower reported therein were investigated using scientific literature on the Passionflower and its components. The author then discusses the involvement of Passionflower-containing C-glycosylflavone in the hypnotic, sedative, and anxiolytic effects of Passionflower. In addition, the author discusses the development of future pharmaceuticals (crude drugs) based on Passionflower-containing C-glycosylflavone.
Method: 1) The author investigated the specifications and test methods of the Passionflower listed in EP3.0 (2000) to EP10.3 (2021) and BP2000 to BP2022. 2) The author used J-Global to search for scientific information on various C-glycosylflavone components contained in Passionflower standards and test methods listed in EP and BP. Among them, scientific literature on various C-glycosylflavones was extracted. The author then investigated scientific information such as the biological activity effect of various C-glycosylflavones contained in Passionflower.
Results: 1) In EP and BP, it is specified that various C-glycosylflavones such as vitexin, isovitexin, orientin, isoorientin, and swertisin were detected as passive flora-containing components through qualitative analysis using thin-layer chromatography. 2) A recent study reported that Passionflower can be divided into two chemical species (types) based on their chemical component consistency: conventional isovitexin species and swertisin species. 3) C-glycosylflavone belongs to the flavonoids class of polyphenols. Therefore, it is considered that the antidepressant and anti-anxiety effects of Passionflower correspond to the 1) anti-inflammatory action, 2) antioxidant action, and 3) antioxidative-stress action of the C-glycosylflavone component present. The anti-anxiety effect of Passionflower is thought to be due to specific binding to benzodiazepine receptors in the central nervous system. Furthermore, the sedative effect of Passionflower is thought to be due to activation of GABA by binding to GABA receptors in the brain.
Conclusion: The author was able to obtain detailed knowledge of various C-glycosylflavones contained in Passionflower through investigating the specifications and test methods for Passionflower listed in EP and BP in 2000. Passionflower exhibits tranquilizing effects such as antidepressant, anti-anxiety, and anti-stress effects. It is believed that this is due to the mutual effect of the biological activities of various C-glycosylflavone components found in Passionflower. Furthermore, it is thought that a wide variety of bioutilities can be derived from Passionflower based on its biologically active effects of 1) to 3). It is expected that Passionflower can contribute to the maintenance of human health and homeostasis. In the future, the author hopes that Passionflower will be further developed as a pharmaceutical (crude drug).
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