Corrosion inhibition of mild steel from Jatropha curcas stem bark was investigated using gravimetric method at 303K. The results showed that it contains 1.66% alkaloids and 1.53% tannins, these phytocompounds were found to inhibit corrosion process of mild steel in the test solutions and the inhibition efficiency depends on the concentration of alkaloids and tannins as well as the exposure time. The adsorption of both alkaloids and tannins on the mild steel was found to obey and Langmuir adsorption isotherms and this suggested that the inhibitor molecules have been spontaneously adsorbed onto the surface of mild steel through a physical adsorption mechanism. The inhibition efficiency is markedly higher in addition compared with that of tannins extracts. Corrosion inhibition is attributed to the spontaneous physical adsorption of the plant constituents on the surface of the mild steel.
Flavonoids represent a wide spread group of water soluble phenolic derivatives, known for their medicinal effect. This paper is focused on identifying the functional groups present in flavonoids of Blighia sapida stem bark and root sample. The percentage yield was higher with methanol extract of the stem bark compared to the root. The GC-MS of methanol extract shows carboxylic acid which might be attributed to presence of lipids. The isolation of flavonoids by TLC and the FITR revealed the functional group -OH, C=O,CH which are majorly responsible for the medicinal effect.
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