P. Shwethambika; J. Ishwara Bhat
Abstract
Theobroma cocoa dry bean extract (CDBE) was prepared by Soxhlet extraction method and was characterized for its chemical constituents using Fourier Transform-Infrared Spectroscopy (FT-IR), Gas chromatography-Mass spectroscopy (GC-MS) and also by Thermogravimetric Analysis-Differential Scanning Calorimetry ...
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Theobroma cocoa dry bean extract (CDBE) was prepared by Soxhlet extraction method and was characterized for its chemical constituents using Fourier Transform-Infrared Spectroscopy (FT-IR), Gas chromatography-Mass spectroscopy (GC-MS) and also by Thermogravimetric Analysis-Differential Scanning Calorimetry (TGA-DSC) techniques. FT-IR analysis gave information about the mostly like to be present functional groups in the extract. GC-MS analysis of the extract revealed the presence of important 07 chemical constituents with cis-13-octadecanoic acid as the major component. TGA-DSC study gave the idea about different stages of thermal decomposition of the chemical constituents present in the extract. CDBE was then tested for its ability to inhibit the corrosion rate of mild steel in 1.0M HCl solution medium by means of weight loss, Potentiodynamic polarization, and Electrochemical impedance spectroscopy (EIS) techniques. The weight loss experiments revealed the anticorrosive property of it on mild steel, which was found to increase with increase in the concentration of the inhibitor CDBE and decrease with an increase in temperature of corrosive medium. EIS results showed the adsorption of organic constituents present in the extract at the metal-solution interface. Potentiodynamic polarization studies revealed that CDBE functioned as a mixed type inhibitor. The surface morphological studies of mild steel surface were carried out by Scanning electron microscopy (SEM). The inhibition efficiency values obtained by electrochemical measurements were consistent with those from weight loss measurements and hence it can be proposed that CDBE as a potent inhibitor towards corrosion of mild steel under acidic conditions.
K. sumalatha; J. Ishwara Bhat
Abstract
The medicinal properties shown by different plants are due to phytochemicals present in the plant. These phytochemicals are the most vital source for the treatment of various diseases. Different phytochemicals have an extensive range of activities, which help to enhance the immune system and give resistance ...
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The medicinal properties shown by different plants are due to phytochemicals present in the plant. These phytochemicals are the most vital source for the treatment of various diseases. Different phytochemicals have an extensive range of activities, which help to enhance the immune system and give resistance to the body to protect against attack of harmful pathogens. It is well accepted fact that even areca plant seed is also a good source of phytochemicals and hence planned to examine the phytochemicals present in its different stages, that is, tender areca nut (TACN), mature areca nut (MACN) and dry areca nut (DACN). All the three stages of areca nut extract were examined for tannin, phenols, flavonoids, alcohols, acids, amines and nitro groups. They showed positive results for all the tests. Trace elements such as Cu, Fe, Zn, Cr, Ni, Pb are present in small amount when compared to Na and K, and are identified by Atomic Adsorption Spectroscopy. FTIR analysis revealed the presence of functional groups such as –OH. –NH, -CH, >C=O, >C=C<, >C-O-C and –NO groups in the areca nut extract. Extracts were investigated through GC-MS for identification of the chemical composition of extract, on comparison with results obtained from FTIR, and molecular mass nine, fourteen and five compounds were identified in TACN, MACN and DACN extracts, respectively.
