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Example sentences for: coumarins
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Scorpion venom when injected exerts a strong inflammatory response [ 11 ] . Many plant species used against stings contain compounds with antiinflammatory properties, flavonoids (rutin, hesperidin, quercetin), coumarins (bergapten), coumestans (wedelolactone), triterpenes, sterols and saponins [ 38 11 ] . The mechanism of action of the flavonoids is based on the inhibition of enzymatic steps in the arachidonic acid cascade [ 38 ] . Plant compounds that are immunostimulants at very low doses are some alkaloids, quinones, isobutylamides, phenolcarboxylic acid esters and terpenoids [ 39 ] . Other plant compounds with immunostimulatory effects are sesquiterpene lactones [ 40 ] . Many polysaccharides and glycoproteins enhance the unspecific immune system by activating the phagocytotic activity of granulocytes and macrophages, or by inducing cytokine production or influencing complement factors [ 39 ] .
The use of Justicia secunda for rashes has been previously recorded [ 52 ] . Different species have yielded steroids, lignans, betaine, triterpenoids, coumarins, dihydrocoumarin, umbelliferone and 3-(2-hydroxyphenyl) propionic acid alkaloids and flavonoids [ 90 91 92 ] . Coumarins and flavonoids have anti-inflammatory properties [ 38 11 ] . Wounds on Wistar rats treated with organic and aqueous extracts of Justicia pectoralis showed intermediate swelling in comparison to wounds treated with coumarin isolated from the plant extract (least swelling) and the controls [ 93 ] . This study supported local usage for wound-healing properties.
Crushed leaves of Nicotiana tabacum are applied to wounds in Guatemala [ 63 ] . The steam vapour was a general cure-all in Latin America and the Caribbean [ 16 104 ] . Historically, powdered tobacco was burnt on the blade of a paddle as a propitiatory offering to the local boa snake ( Constrictor orophias ) [ 16 ] . The plant contains nicotine, malic and citric acids, phenolic acids (chlorogenic, quinic, nicotinic), flavonoids (rutoside), coumarins and enzymes [ 81 ] . Presumably the nicotine in the dog's nose would act as a stimulant.
utilis) that produce a dose-related increase in the clotting time of blood induced by carpet viper venom ( Echis carinatus ) would be useful against bites from Bothrops species that cause haemorrhage at the point of injection due to the inhibition of the clotting mechanism [ 40 ] . Antivenom compounds so far isolated from plants include protocatechuic acid, a catechin-gallo-catechin tannin, caffeic acid derivatives (chlorogenic acid, cynarin), coumarins (bergapten), flavonoids (rutin, isoscutellarein, kaempferol, quercetin, hesperidin), ar-turmerone, alkaloids (aristolochic acid), triterpenoids, triterpenes, coumestans (wedelolactone), sterols (sitosterol, stigmasterol, beta-amyrin), triterpenoid glycosides, alkaloids (allantoin) and lignoflavonoids [ 43 40 44 42 ] . Many relevant compounds are widely distributed nitrogen-free, low molecular weight compounds (except aristolochic acid, an untypical non-basic, nitro-derivative) [ 38 ] . The structural similarities of certain plant chemicals found in plants used for snakebites are an isoflavone skeleton, acidic nature and dioxygenated functionality [ 44 ] .
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