Antibacterial and Antioxidant Activity of Rhodomyrtus Tomentosa and Cinnamomum Zeylanicum Crude Extracts

The aim of this study was to investigate the extraction method for R.to­mentosa and C.zeylanicum leaves and the evaluation of antibacterial and antioxidant activities of crude extracts.The results of the study showed that the active ingredients of crude extracts were clearly separated by Thin-layer chromatography and the presence of rhodomyrtone in R.tomentosa crude extract and cinnamaldehyde in C.zeylanicum crude ex­tract.R.tomentosa crude extract was antibacterial activity against Staph­ylococcus aureus with 13.1 mm of inhibition zone,but is not effective against Salmonella Typhimurium.C.zeylanicum leaf extract did not show antibacterial activity on both S.aureus and S.Typhimurium.At a dilution of 1/2 of the R.tomentosa crude extract can completely inhibit S.aureus growth.This study also indicated the presence of antioxidant compounds such as flavonoids,tannins,phenols and terpenoids in C.zeylanicum and R.tomentosa crude extracts.The results showed that R.tomentosa and C.zeylanicum crude extracts should be used as a biotherapy alternative to antibiotic therapy.However,further study would be needed to investigate the antibacterial activity of crude extracts in vivo.

A Simple Procedure for Extraction of Surface Protein of Salmonella Serotypes and Escherichia coli Strains Isolated from Poultry and Pigs

Salmonella and E.coli possess different surface protein structures that can induce protective immune responses.Identification of these proteins capacitates development of diverse applications in prevention and diagnosis that contribute to effectively control disease-causing enterobacteria pathogens such as Salmonella and E.coli.A simple procedure for obtaining protein complexes of Salmonella serotypes and E.coli is performed in this study.A sonication process with heat treatment of whole bacteria induced the release of protein complexes.Concentration of the protein extract was quantified using protein quantification Kits-Rapid,and protein complex profile was obtained by SDS-PAGE(Sodium dodecyl sulfate polyacrylamide gel electrophoresis)and silver staining.The concentrations of protein ranged from 29.45 to 45.35μg/mL in the Salmonella protein extracts,and from 25.35 to 36.72μg/mL in the E.coli protein extracts.Six major groups of proteins from E.coli(YfiO,NipB,OmpF,YfgL,Talc,YaeT)and four major groups of proteins from Salmonella(Flagellin,OmpA,Porin,SEF21)were preliminarily determined by a simple procedure of extraction based on the molecular weight.

Investigation of Two Precipitation Methods for Extracting Immunoglobulin Y(IgY)from Egg Yolks

Two groups of hens(control and immunization group)were arranged in an experimental design with an immunization schedule of 3 injections of BSA antigen.IgY antibodies were extracted from egg yolks by two precipitation processes(chloroform and polyethylene glycol precipitates)and quantified using a standard curve of protein concentration.The purification of IgY was confirmed by SDS-PAGE.Total protein extracted from egg yoks were less contaminated with yellow pigments(lutein and zeaxanthin)nd by using chloroform precipitate.The 2 week post-immunization,IgY-1 concentration increased respectively to 3903±726μg.ml(chloroform-1 extraction process)and 2937±294μg.ml(PEG extraction process)(P<rd 0.01).After 3 immunization,IgY level obtaining from in immunization group extracted by chloroform process(6633±1166μg.ml-1)increased 2.7 times higher than that in control group(2482±414μg.ml-1).Whereas IgY concentrations obtained from PEG extraction process were not significantly different between the experimental group and control group.Chloroform and PEG precipitation methods had the same protein profile on the SDS-PAGE.IgY antibody was identified by the presence of bands corresponding with IgY heavy chain(67-70 kDa)and IgY light chain(25 kDa)for both precipitation processes.