Hexane Extract Of Bark Research Articles

GC-MS Profiling and Anti-quorum Sensing Screening of Leaf and Bark Extracts and Fractions of Acacia ferruginea: A Threatened Medicinal Plant

The present study was carried out to screen the anti-quorum sensing property of the possible bioactive fractions and valuable secondary metabolites from the hexane extract of bark and leaves of Acacia ferruginea. Solvent extraction of the plant material using hexane followed by preparative thin layer separation and centrifugal thin layer separation of the extract using silica gel yields 12 and 5 fractions, respectively. Spectral characterization (UV, FT-IR) and anti-QS screening were done for the fractions. GC-MS was done for both nonpolar extracts and cyclograph fractions. The active moieties from bark and leaves fractions were established on the basis of UV, FT-IR and GC-MS. From the anti-QS screening studies, the active fractions were determined. A total of 17 fractions were obtained from the hexane extract of bark and leaves of Acacia ferruginea. Among these fractions, 5 fractions were shown to exhibit activity against Chromobacterium violaceum, while 2 fractions showed moderate activity.

ISOLATION OF SECONDARY METABOLITE COMPOUNDS AND ANTIBACTERIAL ACTIVITIES TESTS FROM HEXANE EXTRACT OF STEM BARK MELOCHIA UMBELLATA (HOUTT) STAPF VAR. DEGRABRATA K

Objectives: This research aims to determine the content of secondary metabolite compounds and antibacterial activity of stem bark extract Melochia umbellata (Houtt) Stapf var. degrabrata.Methods: M. umbellata stem bark was extracted by maceration using methanol solvent. Separation and purification were done by partitioning, fractionation with chromatography, and recrystallization. Antibacterial activity test of hexane extract and third isolate from the bark of M. umbellata was done by agar diffusion method against bacterium Bacillus subtilis, Staphylococcus aureus, Escherichia coli, and Pseudomonas aeruginosa.Results: Phytochemical test showed that the hexane extracts of bark M. umbellata containing alkaloids and triterpenoids. Isolate D is a triterpenoid group compound, while FKa and FKb are steroid group compound. The hexane extract had the highest antibacterial activity against B. subtilis bacteria with inhibitory zone diameter 12.0 mm. Isolate D has a weak inhibitory effect on all test bacteria. The highest diameters inhibition zone of isolated FKa compound against B. subtilis and S. aureus bacteria was 18.0 mm and 13.0 mm, respectively, whereas, the highest diameter inhibition of zone FKb compound against B. subtilis bacteria with inhibitory zone was 12.0 mm.Conclusion: The FKa compound from the bark of M. umbellata has the potential to be antibacterial because the compound is able to inhibit bacterial growth with ˃14 mm obstacle zone, especially against B. subtilis bacteria.

Antibacterial effects of 18 medicinal plants used by the Khyang tribe in Bangladesh

Context: The resistance of bacteria to antibiotics is raising serious concern globally. Asian medicinal plants could improve the current treatment strategies for bacterial infections. The antibacterial properties of medicinal plants used by the Khyang tribe in Bangladesh have not been investigated.Objective: The present study examines the antibacterial properties of 18 medicinal plants used by the Khyang tribe in day-to-day practice against human pathogenic bacteria.Materials and methods: Leaves, bark, fruits, seeds, roots and rhizomes from collected plants were successively extracted with hexane, ethyl acetate and ethanol. The corresponding 54 extracts were tested against six human pathogenic bacteria by broth microdilution assay. The antibacterial mode of actions of phytoconstituents and their synergistic effect with vancomycin and cefotaxime towards MRSA was determined by time-killing assay and synergistic interaction assay, respectively.Results and discussion: Hexane extract of bark of Cinnamomum cassia (L.) J. Presl. (Lauraceae) inhibited the growth of MRSA, Enterococcus faecalis, Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae and Acinetobacter baumannii with MIC values below 100 µg/mL. From this plant, cinnamaldehyde evoked at 4 × MIC in 1 h an irreversible decrease of MRSA count Log10 (CFU/mL) from 6 to 0, and was synergistic with vancomycin for MRSA with fractional inhibitory concentration index of 0.3.Conclusions: Our study provides evidence that the medicinal plants in Bangladesh have high potential to improve the current treatment strategies for bacterial infection.

Bioresource of Antioxidant and Potential Medicinal Compounds from Waste Biomass of Spruce

The bark of Norway spruce (Picea abies) has been a source of medications for centuries. Despite that, bark is a waste biomass produced by wood industry in million tons annually. The most abundant compounds obtained from hexane extracts of bark were sterols and terpenes subjected to in silico analysis. Their absorption, distribution, metabolism and excretion properties and possible types of biological activities were predicted. Abietic acid, dehydroabietic acid and β-caryophyllene oxide originated from bark of Norway spruce had most likely antihypercholesterolemic, mucomembranous protecting and antineoplastic activity, respectively. An important discovery was estimation of their pharmaceutically relevant properties. Isolated fractions that were rich in these compounds (contained them up to 30%) displayed excellent trolox equivalent antioxidant capacity (15 mM/mg dm), which was 2.5 times greater than the source of powerful antioxidant, pycnogenol. Antioxidant activity of extracts and fractions determined us...

Gastroprotective effect from Calophyllum brasiliense Camb. bark on experimental gastric lesions in rats and mice

In order to establish the pharmacological basis for the ethnomedicinal use of stem bark extracts of Calophyllum brasiliense Camb. in gastrointestinal affections, this study examined the effects of a dichloromethane fraction (DCMF), obtained from the hexane extract of bark, on ethanol, indomethacin and hypothermic restraint stress-induced gastric lesions in mice and rats, respectively. Oral administration of DCMF at doses ranging from 12.5–250 mg/kg significantly inhibited the development of gastric lesions in all the three test models. It caused significant decreases of the pyloric-ligation and bethanechol-stimulated gastric secretion, and also the free and total acidities. Besides, DCMF offered protection against ethanol-induced depletion of stomach wall mucus and reduction in nonprotein sulfhydryl concentration. The results indicate that DCMF from C. brasiliense possesses antisecretory, antiulcer and cytoprotective properties.