Dear Md.Mazedul Islam,

Oxalis corniculata DOES possess Antibacterial, Antifungal, and Insecticidal activities.

It is also active against E. coli:

International Journal of Analytical Chemistry

Volume 2015 (2015), Article ID 842468, 5 pages

http://dx.doi.org/10.1155/2015/842468

Research Article

Antibacterial, Antifungal, and Insecticidal Potentials of Oxalis corniculata and Its Isolated Compounds

Azizur Rehman, Ali Rehman, and Ijaz Ahmad

Abstract

Oxalis corniculata is a common medicinal plant widely used against numerous infectious diseases. The agrochemical potential of methanolic extract, n-hexane, chloroform, ethyl acetate, and n-butanol fractions were assessed to measure the antibacterial, antifungal, and insecticidal activities of the plant. The crude, chloroform, and n-butanol soluble fractions showed excellent activities against Escherichia coli, Shigella dysenteriae,Salmonella typhi, and Bacillus subtilis but have no activity against Staphylococcus aureus. Similarly the crude, n-hexane, and chloroform fractions were also found to have significant activity against fungal strains includingFusarium solani, Aspergillus flexneri, and Aspergillus flavus and have no activity against Aspergillus niger. Chemical pesticides have shown very good results at the beginning, but with the passage of time the need was realized to use the natural plant sources for the safe control of insects. The current study will provide minor contribution towards it. High mortality rate was recorded for the crude extract and chloroform fraction againstTribolium castaneum. The two isolated compounds 5-hydroxy-6,7,8,4′-tetramethoxyflavone (1) and 5,7,4′-trihydroxy-6,8-dimethoxyflavone (2) were evaluated for antibacterial, antifungal, and insecticidal activities. The results showed that compound 2 was more active than compound 1 against the tested bacterial strains and insects.

PLEASE SEE TABLE 1 in the publication contained in the following link:

http://www.hindawi.com/journals/ijac/2015/842468/

Hoping this will be helpful,

Rafik

Dear Mr. Islam, 

According to the paper entitled, "Phytochemical analysis and antibacterial activity

of Oxalis corniculata ; a known medicinal plant" it possesses Antimicrobial activity. 

Abstract:

Oxalis corniculata Linn. (Family; Oxalidaceae) was tested for antibacterial activity against three important pathovars of Xan thomonas

and fourteen human pathogenic bacteria. Powdered

leaf material was extracted with different solvents viz., petroleum

ether, benzene, chloroform, methanol and ethanol using Soxhlet

apparatus. All the solvent extracts were evaporated to dryness

using rotary flash evaporator. Dry residue was dissolved in re-

spective solvents (1:10 w/v) and tested for antibacterial activity.

Among five solvents tested, methanol and ethanol extracts showed

significant antibacterial activity when compared with K-cycline

and Bact-805 for plant pathogens, Gentamicin and Streptomycin

for human pathogens. Phytochemical analysis of the leaf mate-

rial revealed that the antibacterial activity of the plant material

is because of the presence of phenolic compounds.

http://www.uni-mysore.ac.in/assets/publications/myscience/mysci-0601-05.pdf

Dear Mr. Islam,

According to the paper entitled,"Oxalis corniculata (Oxalidaceae) leaf extract exerts in vitro antimicrobial and in vivo anticolonizing activities against Shigella dysenteriae 1 (NT4907) and Shigella flexneri 2a (2457T) in induced diarrhea in suckling mice". it possesses Antimicrobial activity. 

abstract:In this study, the extract of a green leafy vegetable Oxalis corniculata (Oxalidaceae) was evaluated for its in vitro antibacterial and in vivo anti colonizing effect against common intestinal pathogenic bacteria. Methanolic extract (80%) of Oxalis corniculata (Oxalidaceae) leaf contained a polyphenol content of 910 mg gallic acid equivalent per gram of dry weight and the yield was 8%. The flavonoid content was 2.353 g quercetin equivalent per 100 g of the extract. In vitro studies indicated that the extract inhibited numerous pathogenic bacteria like Staphylococcus aureus (ATCC 25922), Escherichia coli (ATCC 25923), Shigella dysenteriae 1 (NT4907), Shigella flexneri 2a (2457T), Shigella boydii 4 (BCH612), and Shigella sonnie phase I (IDH00968). The minimum inhibitory concentration (MIC) against E. coli (ATCC 25923) was minimal (0.08 mg/mL), whereas MIC against S. flexneri 2a (2457T) was higher (0.13 mg/mL). A suckling mouse model was developed which involved challenging the mice intragastrically with S. flexneri 2a (2457T) and S. dysenteriae 1 (NT4907) to study the anticolonization activity. It was revealed that the extract was more potent against S. dysenteriae 1 (NT4907) as compared to S. flexneri 2a (2457T). It was also found that simultaneous administration of extract along with bacterial inoculums promoted good anticolonization activity. Significant activity was observed even when treated after 3 h of bacterial inoculation.

A number of studies have confirmed the antimicrobial efficacy of Oxalis corniculata. You may refer attached papers.