scholarly journals Evaluation of antimicrobial activity and phytochemical composition of some fractions of methanol stem bark extract of Diospyros mespiliformis

2018 ◽  
Vol 11 (1) ◽  
pp. 47-51
Author(s):  
H.M.G. Abubaka ◽  
H Usman ◽  
Y Karumi
Keyword(s):  
Antimicrobial Activity ◽  
Streptococcus Pyogenes ◽  
Inhibition Zone ◽  
Stem Bark ◽  
Bark Extract ◽  
Active Components ◽  
Column Fraction ◽  
Phytochemical Composition ◽  
Stem Bark Extract ◽  
Micro Organisms

The aim of this study was to determine the active phytochemical(s) most probably responsible for microbial inhibitions, following a bioassay guided protocol. Column chromatographic fractions (AG) obtained from n-Butanol partitioned portion of stem bark extract of Diospyros mespiliformis were analyzed for phytochemical composition. These were subjected to antimicrobial activity tests on clinical isolates of Staphylococcus aureus, Streptococcus pyogenes, Pseudomonas aeruginosa, Klebsiella pneumoniae and Candida albicans. Phytochemical screening conducted on the column fraction E revealed the presence of tannins, free anthraquinones, cardiac glycosides, saponins, terpenoids, and flavonoids. The anti-microbial test results from fractions A, B, F and G, obtained showed no inhibition against most of the micro-organisms tested, while fractions C, D and E showed significant (P<0.05) activities with diameters of inhibition zone of inhibition ranging from 15.00±1.00 mm to 13.00±6.67 mm against Streptococcus pyogenes at all the concentrations tested (50, 12.5, 6.25 mg/ml equivalent to 3, 1.5 and 0.75 mg/disc). The column fraction E showed the highest inhibition zones with broader concentration dependent pattern with MIC at 12.5 mg/ml. The findings from this study showed the presence of bio-active components against Streptococcus pyogenes with relative higher potency in fraction E. Based on this findings, it can be surmised that Fraction E with significant dose-dependent activity is expected to revealed a potent broad-spectrum antimicrobial agent and thus recommended for further purification stages towards compound(s) isolation of a novel antimicrobial agent.Keywords: Antimicrobial, Diospyros mespiliformis, Phytochemical, Potency, Stem Bark

scholarly journals Antimalarial Activity, Phytochemical Composition and Acute Toxicity Tests of Ethanolic Stem Bark Extract of Alstonia boonei De Wild

2020 ◽  
pp. 55-63
Author(s):  
Chidiebere A. Otuu ◽  
Rose N. N. Obiezue ◽  
Chris I. Okoye ◽  
Innocent C. J. Omalu ◽  
Ada Q. A. Otuu ◽  
...  
Keyword(s):  
Acute Toxicity ◽  
Antimalarial Activity ◽  
Stem Bark ◽  
Scientific Basis ◽  
Negative Control ◽  
Toxicity Tests ◽  
Bark Extract ◽  
Phytochemical Composition ◽  
Body Weights ◽  
Stem Bark Extract

Many modern medicines are derived from the chemicals available in plants. The utilization of plants against diseases by traditional medical practitioners is common in many parts of the world and several researches have been carried out to determine the scientific basis for the use of such plants. Alstonia boonei is one of the many medicinal plants found in Nigeria. The plant parts have been traditionally used to treat various ailments including malaria. This study was carried out to evaluate the antimalarial activity, phytochemical composition and toxicity of ethanolic stem bark extract of Alstonia boonei. The extract showed substantial dose dependent antimalarial activity as indicated by the recorded suppressive (45.67%, 58.53% and 74.68% for 100, 200 and 400 mgkg-1 body weights) prophylactic (33.57%, 45.64% and 61.23% for 100, 200 and 400 mgkg-1 body weights) and curative effects (62.35%, 68.57% and 79.63% for 100, 200 and 400 mgkg-1 body weights) on Plasmodium berghei infected white albino mice. The results of the antimalarial tests were significantly different compared to the negative control at P < 0.05. The phytochemical evaluation showed that the plant contained important chemical compounds including tannins, flavonoids, steroids, phenols, alkaloids, saponins, glycosides and terpenoids. The acute toxicity test showed that the extract is safe as observed on the tested mice. It was concluded that the extract contains important active antimalarial compounds that are safe and should be further investigated for antimalarial drug development.

scholarly journals Anticandidal Potential of Stem Bark Extract from Schima superba and the Identification of Its Major Anticandidal Compound

Molecules ◽  
2019 ◽  
Vol 24 (8) ◽  
pp. 1587 ◽  
Author(s):  
Chun Wu ◽  
Hong-Tan Wu ◽  
Qing Wang ◽  
Guey-Horng Wang ◽  
Xue Yi ◽  
...  
Keyword(s):  
Inhibition Zone ◽  
Stem Bark ◽  
New Drugs ◽  
Diffusion Method ◽  
Bark Extract ◽  
Ergosterol Biosynthesis ◽  
Membrane Composition ◽  
Schima Superba ◽  
Stem Bark Extract ◽  
Promising Source

Plant-derived extracts are a promising source of new drugs. Schima superba is traditionally used in China for heat clearing, detoxification, and treatment of furuncles. In this study, the anticandidal properties and mechanism of action of S. superba (SSE) were explored using a stem bark extract. SSE possessed high polyphenol and saponin contents of 256.6 ± 5.1 and 357.8 ± 31.5 µg/mg, respectively. A clear inhibition zone was observed for C. albicans growth through the disc diffusion method and the 50% inhibition of C. albicans by SSE was 415.2 µg/mL. Transcriptomic analysis in C. albicans treated with different doses of SSE was conducted through RNA-seq. Average values of 6068 genes and 20,842,500 clean reads were identified from each sample. Among these samples, 1680 and 1956 genes were differentially expressed genes (DEGs) from the SSE treatments of 0.2 and 0.4 mg/mL, respectively. C. albicans growth was inhibited by the changes in gene expression associated with the cell wall and membrane composition including the regulation of chitin degradation and ergosterol biosynthesis. This result could be reflected in the irregularly wrinkled morphology of the ruptured cell as revealed through SEM analysis. ESI-MS and NMR analyses revealed that the major compound purified from SSE was sasanquasaponin III and the 50% inhibition of C. albicans was 93.1 µg/mL. In summary, the traditional Chinese medicine S. superba can be applied as an anticandidal agent in complementary and alternative medicine.

scholarly journals The Hydroethanolic Stem Bark Extract of Tieghemella heckelii (A.Chev.) Pierre ex Dubard (Sapotaceae) Produced N-Methyl-D-Aspartate (NMDA) Receptor-Dependent Analgesia and Attenuates Acute Inflammatory Pain via Disruption of Oxidative Stress

2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Emmanuel K. Kumatia ◽  
Regina Appiah-Opong
Keyword(s):  
Oxidative Stress ◽  
Nmda Receptor ◽  
Stem Bark ◽  
Bark Extract ◽  
Analgesic Action ◽  
Hot Plate ◽  
Phytochemical Composition ◽  
Stem Bark Extract ◽  
Anti Inflammatory ◽  
Inflammatory Effect

Background. Tieghemella heckelii stem bark is used in African traditional medicine to treat inflammatory pain conditions. However, these biological actions of the plant have not been proven. This study investigates the phytochemical composition and the mechanisms of analgesic and anti-inflammatory actions of the hydroethanolic stem bark extract of T. heckelii (THBE). Methods. Phytochemical composition of THBE was investigated using qualitative and quantitative phytochemical analyses. Anti-inflammatory activity was evaluated using the carrageenan-induced paw oedema assay. Analgesic activity was evaluated using hot plate and acetic acid-induced writhing assays. Mechanism of analgesic action was determined using pharmacological antagonist such as naloxone, atropine, flumazenil, nifedipine, or ketamine. Test agents were administered orally as follows: Tween 80 (5%) (control), diclofenac sodium (DS) 10/tramadol 9 mg/kg (standard), or THBE 10, 100, and 450 mg/kg. Glutathione peroxidase (GPx), superoxide dismutase (SOD), and lipid peroxidation levels were also measured. Results. THBE which contained 58.45% saponins, 229.04 ± 0.049 GAE mg/g phenolic compounds,and 0.482 ± 0.0028 QE mg/g flavonoids produced ( p  < 0.5) anti-inflammatory effect of 56.22% and analgesia of 330 ± 72% and 50.4% in the hot plate and writhing assays, respectively, at 10 mg/kg and inhibited oxidative stress by GPx and SOD elevation in rats during inflammation. Ketamine significantly blocked the analgesia of THBE, indicating NMDA receptor-dependent analgesic action. Whereas, naloxone, atropine, nifedipine, and flumazenil could not antagonize the analgesic action of THBE. Conclusion. These results show that THBE produced potent anti-inflammatory effect via disruption of oxidative stress and also generated NMDA receptor-dependent analgesia.

scholarly journals Phytochemical Screening and Antimicrobial Activities of Lannea acida (a. rich) Stem Bark Extract

2020 ◽  
pp. 21-26
Author(s):  
O. A. Olatunji ◽  
C. I. Ihediuche ◽  
O. W. Bolaji ◽  
A. O. Akala ◽  
S. E. Edet ◽  
...  
Keyword(s):  
Cardiac Glycosides ◽  
Stem Bark ◽  
Antimicrobial Activities ◽  
Bark Extract ◽  
Klebsiella Pneumonia ◽  
Continuous Extraction ◽  
Antimicrobial Drugs ◽  
Stem Bark Extract ◽  
Plant Stem ◽  
Micro Organisms

The persistent resistance of micro-organisms necessitates the need to intensify studies on the use of possible strategies for proper control of pathogens using extracts from natural products. The stem bark of Lannea acida was extracted by two methods of extraction: Cold and Soxhlet (continuous) extraction. The extract of the stem bark was screened to confirm the presence of alkaloids, flavonoids, saponins, tannins and cardiac glycosides in all the samples of ethanol and hexane/acetone/methanol mixture extracts. The phytochemicals examined varied among the stem bark extracts of other solvents (hexane, chloroform, acetone, and methanol). The result of the antimicrobial test shows that the stem bark extracts exhibited efficacy against some microbes (Bacillus cereus, Escherichia coli, Klebsiella pneumonia, Pseudomonas aeruginosa Staphylococcus aureus and Streptococcus pyogenes) that were employed for the study by exhibiting clear inhibition/clearance zones against these microbes which ranges from 06 mm -21 mm. The plant stem bark could therefore be seen as a potential natural source for useful antimicrobial drugs.

scholarly journals Antimicrobial activity and phytochemistry of methanolic stem bark extract of Melia azedarach (Linn.)

2020 ◽  
Vol 12 (1) ◽  
pp. 407-411
Author(s):  
M. Ahmed ◽  
A.H. Bukar ◽  
M.Y. Amuda ◽  
A. Babagana
Keyword(s):  
Antimicrobial Activity ◽  
Developing Countries ◽  
Traditional Medicine ◽  
Stem Bark ◽  
Bark Extract ◽  
Melia Azedarach ◽  
Human Pathogens ◽  
Zone Of Inhibition ◽  
Medicinal Uses ◽  
Stem Bark Extract

The use of traditional medicine is increasing and gaining popularity throughout the developed and developing countries. About 80 % of the people in developing countries rely on traditional medicine for primary health care. The present study was carried out to evaluate the phytochemical constituents and antimicrobial activity of the stem bark of Melia azedarach extracted using methanol as solvent. Phytochemical screening revealed that methanolic stem bark extract contain alkaloid, cardiac glycoside, flavonoids, saponins, steroid, tannin and terpenoid. Antimicrobial efficiency were tested against four human pathogens: Staphylococcus aureus, Escherichia coli, Pseudomonas aeruginosa and Streptococcus spp. The diameter of zone of inhibition (ZOI) was measured and it was found that the extract showed a maximum zone of inhibition against Gram negative and Gram positive pathogens and the zone of inhibition was found to be concentration dependent. The result obtained in this study may be indication that alcoholic extracts of this plant could be a possible source of obtaining new and effective herbal medicine to treat infections which justify the ethno    medicinal uses of Melia azedarach against infectious diseases agents.  Key words: Melia azedarach, antimicrobial, activity, traditional medicine, extract

scholarly journals Antimicrobial activities of extracts from stem bark of Tagetes minuta

Food Research ◽  
2020 ◽  
Vol 4 (6) ◽  
pp. 2089-2094
Author(s):  
M.K. Pillai ◽  
L.I. Santi ◽  
S.B. Mekbib
Keyword(s):  
Escherichia Coli ◽  
Inhibition Zone ◽  
Stem Bark ◽  
Antimicrobial Activities ◽  
Diffusion Method ◽  
Bark Extract ◽  
Bacterial Isolates ◽  
Tagetes Minuta ◽  
Food And Beverage ◽  
Stem Bark Extract

Tagetes minuta hexane stem bark extract (TMHESB), chloroform stem bark extract (TMCHSB), ethyl acetate stem bark extract (TMEASB) and methanolic stem bark extract (TMMESB) were evaluated for their antimicrobial activities using hole-plate diffusion method. Six bacterial isolates viz. Staphylococcus aureus, Listeria monocytogenes, Escherichia coli (wild), Escherichia coli (O157:H7), Pseudomonas aeruginosa and Serratia marcescens and two fungal isolates viz. Candida albicans and Penicillium digitatum were used for this study. The inhibition zones were found to be in the ranges of 10.0±1.6 to 15.5±1.9 mm against bacterial isolates and 11.3±2.1 to 13.4±1.2 mm against P. digitatum. However, these extracts did not exhibit any visible inhibition zone against C. albicans. Additionally, the minimum inhibitory concentrations (MICs) of these extracts were also determined and was found to be in the range of <31.25 to 1000 µg/mL. From this study, we concluded that extracts of the stem bark of T. minuta showed a moderate to significant antimicrobial activities. T. minuta has been used in food and beverage industries as preservative, coloring and flavoring agents. T. minuta also finds therapeutic applications in the traditional medicine.

scholarly journals Antimicrobial Study of Oil and Stem Bark Extracts of Pentaclethra Macrophylla Benth on Six Selected Pathogens

2016 ◽  
Vol 3 (1) ◽  
pp. 7-10
Author(s):  
A. M. Yusuf Babatunde ◽  
L. S. Kasim ◽  
Adegbite A. Ayoade
Keyword(s):  
Staphylococcus Aureus ◽  
Antimicrobial Activity ◽  
Minimum Inhibitory Concentration ◽  
Inhibitory Concentration ◽  
Stem Bark ◽  
Diffusion Method ◽  
Bark Extract ◽  
Haemolytic Streptococcus ◽  
Stem Bark Extract ◽  
Oil Extract

The antimicrobial activity of oil and stem bark extracts of pentaclethra macrophylla benth was determined against staphylococcus aureus, streptococcus pneumonia, Eschericia coli, Haemophilus influenza, α-Haemolytic Streptococcus and Yeast, using hole diffusion method. The results revealed that the most inhibitory zone (25.0mm) was recorded in hexane oil extract against staphylococcus aureus and α-Haemolytic Streptococcus. The minimum inhibitory concentration (MIC) of the oil extract ranges between 7.8125-62.5mg/ml on all the test organisms and aqueous stem bark extract inhibited only Eschericia coli with minimum, inhibitory concentration (MIC) of 62.5mg/ml. However, the oil extract possessed more antimicrobial activity than the stem bark extract. These findings lend more knowledge to the use of pentaclethra macrophylla benth for medicinal purposes.  

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