Evaluation of the antimicrobial activity of crude extracts and isolated constituents from Chresta scapigera

Abstract

Crude extracts and eight isolated compounds from Chresta scapigera were evaluated for antibacterial and antifungal activities by the agar-well diffusion method. Twenty strains, including Gram-positive and Gramnegative bacteria and yeasts were used in the bioassay. Hexane extracts presented the best results while ethanol extracts did not indicate inhibition of the microbial growth. Amongst the evaluated compounds β-amyrin acetate, tiliroside and luteolin showed the strongest antimicrobial effect.

Phytochemical study and antioxidant, antimicrobial and anticancer activities of Melanelia subaurifera and Melanelia fuliginosa lichens

“…It was also observed that the tested extract was inactive against E.coli, whereas the isolated compound exhibited a antimicrobial effect. However, in several previous experiments (Schinor et al 2007;Dos Santos et al 2012) also it has been found that the extracts do not inhibit the grow of microorganisms, but their isolated compounds demonstrate an antimicrobial effect. This is because components are present in the extract act antagonistically and thus reduce the activity of the extract.…”

Phytochemical study and antioxidant, antimicrobial and anticancer activities of Melanelia subaurifera and Melanelia fuliginosa lichens

“…It was also observed that the tested extract was inactive against E.coli, whereas the isolated compound exhibited a antimicrobial effect. However, in several previous experiments (Schinor et al 2007;Dos Santos et al 2012) also it has been found that the extracts do not inhibit the grow of microorganisms, but their isolated compounds demonstrate an antimicrobial effect. This is because components are present in the extract act antagonistically and thus reduce the activity of the extract.…”

A Review on the Dietary Flavonoid Tiliroside

“…Tiliroside did not exert extraordinary activity against most pathogenic bacteria or fungi, such as various strains of Staphylococcus aureus, P. aeruginosa, C. albicans , and others mentioned in Table (Ferreira et al., ; Schinor, Salvador, Ito, & Dias, ). For MIC values, see Table .…”

Phytochemical Profile of the Ethanol Extract of Malvaviscus arboreus Red Flower and Investigation of the Antioxidant, Antimicrobial, and Cytotoxic Activities

“…At 4 × MIC concentration, the ERF showed a decrease in the amount of viable V. damsela at 8–24 h. The extent by which bacteria was inhibited by the plant extract by time varied greatly, as shown by killing analyses [ 33 ]. Therefore, the capacity of plant secondary metabolites to possess antibacterial characteristics may be taken into consideration, as well as their response to microbial infection [ 34 ].…”

Phytochemical study and antioxidant, antimicrobial and anticancer activities of Melanelia subaurifera and Melanelia fuliginosa lichens

“…It was also observed that the tested extract was inactive against E.coli, whereas the isolated compound exhibited a antimicrobial effect. However, in several previous experiments (Schinor et al 2007;Dos Santos et al 2012) also it has been found that the extracts do not inhibit the grow of microorganisms, but their isolated compounds demonstrate an antimicrobial effect. This is because components are present in the extract act antagonistically and thus reduce the activity of the extract.…”

A Review on the Dietary Flavonoid Tiliroside

“…Tiliroside did not exert extraordinary activity against most pathogenic bacteria or fungi, such as various strains of Staphylococcus aureus, P. aeruginosa, C. albicans , and others mentioned in Table (Ferreira et al., ; Schinor, Salvador, Ito, & Dias, ). For MIC values, see Table .…”

Phytochemical Profile of the Ethanol Extract of Malvaviscus arboreus Red Flower and Investigation of the Antioxidant, Antimicrobial, and Cytotoxic Activities

“…At 4 × MIC concentration, the ERF showed a decrease in the amount of viable V. damsela at 8–24 h. The extent by which bacteria was inhibited by the plant extract by time varied greatly, as shown by killing analyses [ 33 ]. Therefore, the capacity of plant secondary metabolites to possess antibacterial characteristics may be taken into consideration, as well as their response to microbial infection [ 34 ].…”

Phytochemical study and antioxidant, antimicrobial and anticancer activities of Melanelia subaurifera and Melanelia fuliginosa lichens

“…It was also observed that the tested extract was inactive against E.coli, whereas the isolated compound exhibited a antimicrobial effect. However, in several previous experiments (Schinor et al 2007;Dos Santos et al 2012) also it has been found that the extracts do not inhibit the grow of microorganisms, but their isolated compounds demonstrate an antimicrobial effect. This is because components are present in the extract act antagonistically and thus reduce the activity of the extract.…”

A Review on the Dietary Flavonoid Tiliroside

“…Tiliroside did not exert extraordinary activity against most pathogenic bacteria or fungi, such as various strains of Staphylococcus aureus, P. aeruginosa, C. albicans , and others mentioned in Table (Ferreira et al., ; Schinor, Salvador, Ito, & Dias, ). For MIC values, see Table .…”

Phytochemical Profile of the Ethanol Extract of Malvaviscus arboreus Red Flower and Investigation of the Antioxidant, Antimicrobial, and Cytotoxic Activities

“…At 4 × MIC concentration, the ERF showed a decrease in the amount of viable V. damsela at 8–24 h. The extent by which bacteria was inhibited by the plant extract by time varied greatly, as shown by killing analyses [ 33 ]. Therefore, the capacity of plant secondary metabolites to possess antibacterial characteristics may be taken into consideration, as well as their response to microbial infection [ 34 ].…”