Screening of Yemeni medicinal plants for antibacterial and cytotoxic activities

Ali, Nasser A. Awadh; Jülich, Wolf-Dieter; Kusnick, C.; Lindequist, Ulrike

doi:10.1016/s0378-8741(00)00364-0

Cited by 281 publications

(163 citation statements)

References 8 publications

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“…From the results obtained, it appears that the antibacterial action of the extracts is more pronounced on gram-negative than on gram-positive bacteria in most cases or is even equal. These findings do not correlate with the observations of previous screenings of medicinal plants for antimicrobial activity, where most of the active plant extracts showed activity against Gram-positive strains only [56][57][58][59] . Because Gram-negative organisms were reported to be less susceptible to the action of antibacterials, since they possess an outer membrane surrounding the cell wall, which restricts diffusion of hydrophobic compounds through its lipopolysaccharide covering [60][61][62][63][64][65][66][67] .…”

Section: Discussioncontrasting

confidence: 99%

See 1 more Smart Citation

Anti–bacterial activity and brine shrimp lethality bioassay of methanolic extracts of fourteen different edible vegetables from Bangladesh

Ullah

Haque

Urmi

et al. 2013

Asian Pacific Journal of Tropical Biomedicine

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Section: Discussioncontrasting

confidence: 99%

“…These findings do not correlate with the observations of previous screenings of medicinal plants for antimicrobial activity, where most of the active plant extracts showed activity against Gram-positive strains only [56][57][58][59].…”

Section: Related Reportscontrasting

confidence: 99%

Anti–bacterial activity and brine shrimp lethality bioassay of methanolic extracts of fourteen different edible vegetables from Bangladesh

Ullah

Haque

Urmi

et al. 2013

Asian Pacific Journal of Tropical Biomedicine

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“…According to TORTORA et al 41 , the cell wall of Gram-negative bacteria acts as a barrier to a number of substances, including antibiotics. This would also explain why medicinal plants tend to be more effective against Gram-positive than Gramnegative cultures 5,26,33 .…”

Section: Resultsmentioning

confidence: 99%

Antibacterial effect (in vitro) of Moringa oleifera and Annona muricata against Gram positive and Gram negative bacteria

Viera

Mourão

Ângelo

et al. 2010

Rev. Inst. Med. trop. S. Paulo

144

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SUMMARYAntibacterial effects of aqueous and ethanolic extracts of seeds of moringa (Moringa oleifera) and pods of soursop (Annona muricata) in the concentration of 1:5 and 1:10 in volumes 50, 100, 150 and 200 μL were examined against Staphylococcus aureus, Vibrio cholerae, Escherichia coli (isolated from the organism and the aquatic environment) and Salmonella Enteritidis. Antibacterial activity (inhibition halo > 13 mm) against S. aureus, V. cholerae and E. coli isolated from the whiteleg shrimp, Litopenaeus vannmaei, was detected in aqueous and ethanolic extracts of moringa. E. coli isolated from tilapiafish, Oreochromis niloticus, was sensitive to the ethanolic extract of moringa. The aqueous extracts of soursop showed an antibacterial effect against S. aureus and V. cholerae, but the antibacterial activity by the ethanol extracts of this plant was not demonstrated.

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“…The extracts were tested six times and the diameters of the halos were expressed as mean standard deviation of the results obtained in six repetitions. Halos equal and greater than 10 mm were considered significant antimicrobial activity (Awadh Ali et al 2001;Bakshu et al, 2001, Khan et al, 2001, Chowdhury et al 2002, Ferronatto et al, 2007, Silva et al, 2007, Nascimento et al, 2007, Aguiar et al, 2008.…”

Section: Evaluation Of Antimicrobial Activitymentioning

confidence: 99%

Influence of gamma radiation on the antimicrobial activity of crude extracts of Anacardium occidentale L., Anacardiaceae, rich in tannins

Santos¹,

Silva²,

Silva³

et al. 2011

Rev. bras. farmacogn.

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Anacardium occidentale L. Anacardiaceae, known as cashew, commonly found in northeastern of Brazil, has high levels of secondary metabolites, particularly tannins, used as raw material for herbal medicines. An effi cient alternative to decontaminate plant products is the total sterilization or reduction of the initial microbial count, the process of gamma irradiation with 60 Co. The objective of this study was to analyze the antimicrobial activity of crude extracts of bark and leaves of A. occidentale, based on the quantifi cation of total phenols and tannins, before and after exposure to gamma radiation from 60 Co. The extracts were obtained in the laboratory by cold maceration in ethanol, fi ltered and dryness. They were divided into non-irradiated control group (0 kGy) and irradiated: groups exposed to gamma radiation at doses of 5, 7.5 and 10 kGy. The total phenols was obtained by the Folin-Ciocalteau method and tannins, by the precipitation of casein. The antimicrobial potential activities of these extracts were also evaluated. The results showed that gamma radiation doses employed in this study did not infl uence statistically the percentage of total phenols and tannins in the bark extracts, at levels ranging from 5.73±0.14 and 5.20±0.14, respectively. The levels of metabolites in the leaves were statistically (p<0.05) infl uenced by radiation, observed average total phenols between 3.13±0.04 (0 kGy) and 3.50±0.08 (10 kGy), and tannin between 2.47±0.06 (0 kGy) and 2.93±0.04 (10 kGy). The extracts of bark and leaves were active against Staphylococcus aureus, Micrococcus luteus, Bacillus subtilis, Enterococcus faecalis, Mycobacterium smegmatis, Candida albicans. Gamma radiation caused an increase in antimicrobial activity of extracts against Staphylococcus aureus (Gram positive), with average inhibition zones for shells: 14.33±058 (0 kGy) and 22.33±0.58 (10 kGy), and leaves: 11.33±0.58 (0 kGy) and 19.00±1.00 (10 kGy). Exposure to radiation caused changes in physical and chemical constituents of phenolic extracts of leaves of cashew, increasing levels of tannins.

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Screening of Yemeni medicinal plants for antibacterial and cytotoxic activities

Cited by 281 publications

References 8 publications

Anti–bacterial activity and brine shrimp lethality bioassay of methanolic extracts of fourteen different edible vegetables from Bangladesh

Anti–bacterial activity and brine shrimp lethality bioassay of methanolic extracts of fourteen different edible vegetables from Bangladesh

Antibacterial effect (in vitro) of Moringa oleifera and Annona muricata against Gram positive and Gram negative bacteria

Influence of gamma radiation on the antimicrobial activity of crude extracts of Anacardium occidentale L., Anacardiaceae, rich in tannins

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