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Histamine release is involved in developing wakefulness and activation of cortex. The purpose of the study was to find an alternative to these antihistamines by inhibiting the enzyme histidine decarboxylase which is responsible for the production of histamine. Histamine brings about the allergic response due to mast cell degranulation. It is also necessary that the enzyme is not completely inhibited as it plays a role as a neurotransmitter and also regulates gastric acid secretion. In the present study, the methanolic extract of commercially available fennel seeds were examined for its inhibitory activity on the purified extract of bacterial histidine decarboxylase. The methanolic extract of fennel was analyzed to check the presence of various phytochemical constituents. The spice extract was quantified to estimate the presence of flavonoids. The extract was subjected to purification by thin layer chromatography and HPLC in order to isolate and identify the flavonoids present in spice extract. The HPLC results with reference to the standard indicated the presence of ellagic acid and quercetin. The spice extracts were subjected to inhibitory studies at increasing concentrations. The fennel extract at concentration of 0.625 moles was found to be inhibiting histidine decarboxylase which was determined using the Dixon plot. The identified flavonoids were then subjected to software’s like Molinspiration and Swiss ADME in order to study the molecular properties, drug likeliness and pharmacokinetics.
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