In-vitro, antiviral, antimicrobial and antioxidant potential activity of Tomato pomace
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© 2015, Global Research Online. All rights reserved. This work aimed to evaluate the efficiency of different organic solvents such as, aqueous, ethanol and acetone for extraction of phenolic, flavonoid and tannin compounds (TPC, TFC and TTC, respectively) from the Tomato pomace powdered and their antiviral, antimicrobial and antioxidant activities. The aqueous extract showed the highest (p = 0.05) values for TPC. While, the acetone extract exhibited the highest values for TFC and TTC. Also, the results revealed that all extracts of the Tomato pomace exhibited variable antioxidant activity. Four methods were carried out to determine the antioxidant activity of Tomato pomace. Tomato pomace acetone extract exhibited greater DPPH· scavenging activity than those extracted by other solvents. The same trend was achieved by using the ABTS· < sup > + < /sup > , Fe < sup > 2+ < /sup > - chelating and reducing power assays. Some natural compounds were identified by HPLC in tomatoes pomace. Benzoic acid showed the major phenolic compounds presented of the Tomato pomace extracts. The aqueous Tomato pomace extract exhibited strong antimicrobial action in comparison with acetone and ethanol extracts. Increases in the concentration of extract resulted in an increase in its antimicrobial activities. As well, aqueous extract showed high antibacterial activity against gram-positive bacteria and yeast with MIC between 147 and 154 ppm. Aqueous extract had a dire effect on the biosynthesis of protein in cells of Bacillus subtilis, but the effect was slightly noted on the biosynthesis of nucleic acid. The results are of grand importance for improving the biological activity, fu nctionality and health impact of Tomato pomace extract that could be applied in special food. The three tested Tomato pomace extracts were showed moderate anti avian influenza A H5N1 activity with 71% peak activity for acetone extract at 400µg/µl concentration. The obtained results showed that, the solvent play a vital role in the extraction of the plant constituents and Tomato pomace is a very promising source of bioactive compounds and can be used or its extracts as antiviral, antimicrobial and antioxidant agent.
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