10 research outputs found
Ecofriendly Synthesis in Aqueous Medium: An Expeditious Approach to New N,N-Diethyl Amide Bearing Benzenemethanesulfonamides
An highly expeditious synthetic approach for the synthesis of benzenemethanesulfonamides (1a-k) and their new corresponding N,N-diethyl substituted amido moieties (2a-k) has been achieved in aqueous medium at room tem-perature. The reaction condition was thoroughly optimized thereby allowing significant rate enhancement and resulting into excellent yields. The chemical structures of the successful candidates were confirmed using elemental analytical and spectroscopic data such as IR, 1H NMR, 13C NMR and some selected mass spectral dat
Synthesis and Antibacterial Activity of N,N-Diethyl-3-substituted-2-(4-methyl-phenylsulfonamido)alkanamides and their Arylsulfonamide Precursors
A series of N,N-diethyl-3-substituted-2-(4-methylphenylsulfon amido)alkanamides (8a-k) and their arylsulfonamide precursors (7a-k) have been synthesized via facile approach. The chemical structures of the synthesized compounds were confirmed by analytical data and spectroscopic means. The in vitro antibacterial screening of these compounds along with streptomycin, showed N,N-diethyl-2-(4-methylphenylsulfonamido) -3-phenylpropanamide (8j) to be the most active agent on Escherichia coli at MIC of 12.5 μg/mL and on Staphylococcus aureus at MIC of 25 μg/mL
Cholinesterase and microbial inhibitory activities of Tetrapleura tetraptera
The cholinesterase and microbial inhibitory activities of different parts of Tetrapleura tetraptera plant were evaluated due to their local applications. The cholinesterase results revealed that the extracts showed some levels of inhibitory effects depending on the solvents used. Tetrapleura tetraptera leaves had better inhibitory effects with maximum inhibitory activity of 70.0% at a concentration of 1.00mg/l for the water extract. Tetrapleura tetraptera bark showed highest inhibitory effect of 71.05% and (84.34%) for the ethanol and chloroform extracts at concentrations of 0.5mg/l and 1.0 mg/l respectively. While for petroleum ether, T. tetraptera bark recorded 74.34% inhibitory effect at concentration of 2.0 mg/l and also showed continuous increase in inhibitory activity as the concentration increases for aqueous methanol. The results of the antimicrobial activities showed that among all the test organisms, theethanol and water extracts of the leaves, stem, bark and root of the plants had promising activity against Escherichia coli, Staphylococcus aureus, Proteus mirabilis, Pseudomonas aeruginosa and Klebsiella pneumonia bacteria and Aspergillus fumigatus and Rhizopus species fungi. There was no activity shown by the ethanol and water extracts ofthe parts of the plants with Fugarium oxysporum, Penicillium chrysogenum and Mucor species fungi. The bacteria strains were more sensitive to the tested extracts than the fungi strains
Phytochemical Screening and Antimicrobial Studies of Stem and Root Extracts of Crateva adansonii
Aim: This study was designed to explore the phytochemical and antimicrobial screening of the
stem and root extracts of Crateva adansonii.
Place and Duration of Study: Sample: Iyesi village, Ota, Ogun State, and analysis carried out at
Department of Chemistry and Department of Biological Sciences, Covenant University, Ota, Ogun
State and for duration of three months (November 2016 to February 2017).
Methodology: Standard universal procedures were employed for both phytochemical and
antimicrobial analysis.
Results: The result obtained from the stem and root extracts of Crateva adansonii indicated the
presence of flavonoids, terpenoids, alkaloids, and cardiac glycosides. Root extract was found to be
richer in source of phytochemicals when compared to the stem extract. However, the highest antibacterial activity was observed against selected bacteria by both stem and root extracts. The
potency of the root extract was observed to be higher than the stem extract against Bacillus cereus,
Staphylococcus aureus, Aspergillus niger and Serratia spp.
Conclusion: The preliminary studies on the stem and the root of Crateva adansonii extracts
revealed their antimicrobial potential which could be further investigated for global utilization in
pharmaceutical treatment, natural therapies, food preservation and cosmetic applications
Phytochemical Screening and Antimicrobial Studies of Crateva adansonii Leaf Extract
Diverse challenges of microbial infections and upsurge of multi-drug
resistant microbes informed the investigation into the phytochemical and
antibacterial properties of Crateva adansonii. Cold extraction was carried out
using methanol solvent. The crude extract of Crateva adansonii was fractionated
into the n-hexane, methanol and chloroform layers successively. The
phytochemical screening indicated the presence of alkaloids, saponins, terpenoids,
flavonoids and cardiac glycosides. The antimicrobial assay showed that, for
Bacillus spp, the organism was sensitive to the chloroform fraction of leaf extract
at 1.562 mg/ml. For Microccocus varians, result showed organism was sensitive to
the crude extract at 3.125 mg/ml. According to the result of antifungal screening,
the n-hexane fraction and crude extract showed activity against Aspergillus niger
at 12.500 mg/ml and 3.125 mg/ml respectively. From these results, the crude
extract of the leaf of Crateva adansonii shows activity against both bacteria and
Fungi; hence, it may might be a good source of new drug for treating infections
caused by these pathogen
Pinus glabra: As a Potential Source of Anti- Mycobacterium tuberculosis Agent: Phytochemical and antimicrobial Studies of its Stem Extracts
With the increasing incidence of tuberculosis and
rated second to HIV-AIDS by the World Health Organisation as
a leading cause of death from infectious disease and increased
resistance to drugs currently in use, there is therefore the need
for alternative sources of drugs for the treatment of this disease.
Pinus glabra presents as a potential candidate for such drugs
discovery. Concoctions derived from the plant have been used to
treat cases of rheumatism, cough, piles and catarrh. Sample
extraction was performed by soaking the stem samples in ethanol
for 172 h, which gave reddish-yellow oil after removal of the
ethanol solvent. The oil was partitioned between 1:1
water/chloroform mixture. The aqueous layer was further
partitioned separately with ethyl acetate and hexane. The
phytochemical screening of the crude ethanol extract revealed
the presence of alkaloids, saponins, tannins and flavonoids.
Antimicrobial tests were performed on the crude ethanol extract,
ethyl acetate and hexane fractions against clinical isolates
Escherichia coli, Staphylococcus aureus, Pseudomonas aeruginosa
and Klebsiella sp. by measurement of zones of inhibition. All test
samples exhibited significant antimicrobial activity against the
organisms albeit to different extent
In-vitro Anti-Microbial Studies and GC/MS Analysis of the Leaf Extract and Fractions of Polyalthia longifolia (Engl. & Diels) Verde
Extensive studies show that secondary metabolites in plants, used for centuries in
traditional medicine, offer new sources of drugs. In the traditional setting, extracts from
various parts of the plant Polyalthia longifolia (mast tree) are used in treating several
ailments but the components of these extracts, which would allow for meaningful dosage,
are not known. We therefore decided to examine the antimicrobial activity by testing on
selected microorganisms and identify the volatile components by gas chromatography-mass
spectrometry of the leaf extracts of Polyalthia longifolia (mast tree). The crude leaf extract
and fractions derived from the crude exhibited anti-microbial activity against two (2)
bacteria and two (2) fungi. The chloroform fraction was very active against Salmonella
typhi (13.00±0.82) when compared to fractions in other solvents. The GC-MS analysis
showed that the extracts were composed fatty acids and their ester along with some long
chain aldehydes, like hexadecenal and tetradecenal, and Caryophyllene and
Aromandendrene. These chemical constituents may be responsible for the pharmacological
and therapeutic activities of this plan