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Mahasen A. Radwan*, Iman Y. Zaghloul and Nayira A. Abd Elbaky
Abstract: An accurate, sensitive and simple high-performance liquid chromatography (HPLC) assay with UV detection has been developed and validated for the simultaneous determination of etoricoxib and its internal standard (IS) flurbiprofen in plasma has been developed. After plasma samples clean up by protein precipitation, followed by solvent evaporation and reconstitution with the mobile phase, an aliquot of the resulted solution were injected into the chromatograph. Peaks were eluted from a Novapak-C8 column using a mobile phase consisting of acetic acid: triethylamine: acetonitrile: water (0.02: 0.01: 41: 59.97, v/v), pH 4.0 at flow rate of 1 ml/min. The detection wavelength was 245 nm with a limit of detection of 50 ng/ml, with a coefficient of variation of 9.8%. Small volumes of plasma were required (200 µL) for etoricoxib determination. The run time was 10 min with etoricoxib and IS eluted in 3.8 and 7.2 min, respectively. The standard curve for the drug was linear in the range of 100 - 5,000 ng/ml for etoricoxib with correlation coefficient > 0.997. This method has been fully validated and shown to be specific, accurate and precise. The assay was selective, where the drug peak was well resolved with no interference from different drugs which could be given concomitantly. The extraction procedure was simple and rapid producing good recovery and a clean baseline, and providing excellent resolution and peak shape for all analytes. The assay was applied to determine the pharmacokinetics of etoricoxib in rats after 15 mg/kg oral dose. Etoricoxib plasma concentrations time profile follows two-compartmental open model with fast distribution and slow elimination phases. This assay is being utilized in determining etoricoxib pharmacokinetics in animals to monitor its interactions with other drugs or food supplements in our laboratory.[...] Read More.
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A. A. Aliero* and S. H. Wara
Abstract: Leptadenia hastata (Pers.) Decne is a wild plant used as vegetable by many African populations and medicine due to its nutritive and therapeutic properties for the treatment of wounds and stomach upset in children. Acetone, methanol and aqueous extracts from its leaves were investigated against five selected bacterial species and two fungal species. Aqueous extract markedly inhibited the growth of Salmonella paratyphi and Escherichia coli at 30 mg/ml and Pseudomonas aeruginosa at 60 mg/ml. The activity exhibited by the methanol extract was generally low and acetone extract did not show any activity against the tested organisms. The result of antimycotic assay showed that methanol extract suppressed the growth of Fusarium oxysporum and Aspergillus niger at 80 mg/ml with inhibition percentages ranging from 58.89 to 73.30%. The activity of acetone extract was low with 40 and 50% inhibition on the growth of A. niger and F. oxysporum respectively. The result obtained in this study has provided a scientific support for the claimed ethnomedical uses of aqueous extracts of L. hastata in the treatment of bacterial diseases and suggest the potential of methanol extract as a source of antifungal agent. Keywords: Leptadenia hastata, antibacterial, antifungal, wild vegetable, ethnomedicine.[...] Read More.
Keywords: Leptadenia hastata, antibacterial, antifungal, wild vegetable, ethnomedicine.
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Rajinder Singh Gujral*, Sk Manirul Haque and Sanjeev Kumar
Abstract: A simple isocratic reversed phase HPLC method was developed and validated for the analysis of pregabalin in bulk, pharmaceutical formulations and human urine samples, the separation was accomplished on a C18 5 µm ODS hypersil column (250 mm × 4.6 mm) using a methanol acetonitrile - 0.02 M di - potassium hydrogen orthophosphate (K 2HPO 4) (pH - 7.00) (3: 1: 16, v/v/v) mobile phase. The compound eluted isocratically at a flow rate of 1.0 ml /min. The UV detector was set at 210 nm for the detection of pregabalin. The method was linear over the range of 0.75 - 6.00 µg/ml. The method was validated with respect to accuracy, precision, linearity, ruggedness, limit of detection and limit of quantitation. Robustness testing was also conducted to evaluate the effect of minor changes to the chromatographic system and to establish appropriate system suitability parameters. This method was used successfully for the quality assessment of 5 pregabalin drug products and human urine samples with good precision and accuracy.[...] Read More.
Keywords: Pregabalin, isocratic system, validation, high performance liquid chromatography, pharmaceutical formulations, human urine samples.
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Jean Koudou*, Louis-Clément Obame, Brice S. Kumulungui, Prosper Edou, Gilles Figueredo, Jean –Claude Chalchat and Alfred S. Traore
Abstract: The essential oil isolated from the resin of Aucoumea klaineana Pierre (Burseraceae) by Hydrodistillation was analyzed by capillary gas chromatography (GC) and combined Gas Chromatography/Mass Spectrometry (GC/MS). The analysis led to the identification of 28 components. This oil contained mainly monoterpenoids (96.06%) in which p-acetyl anisole is the single benzenic compound (0.18%). The predominant constituents in the essential oil were -3-carene (72.31%), p-cymene (3.76%), limonene (4.04%), terpinolene (6.28%) and -terpineol (4.34%). The essential oil showed antioxidant and weak DPPH radical scavenging activities and it displayed the inhibition of lipid peroxidation.[...] Read More.
Keywords: Aucoumea klaineana, Burseraceae, essential oil, antioxidant activity.
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Amole Olufemi Olatokunboh*, Yemitan Omoniyi Kayode and Oshikoya Kazeem Adeola
Abstract: The anticonvulsant activity of the aqueous leaf extract of Rauvolfia vomitoria (Afzel) was investigated by testing the effects of the extract on strychnine-, picrotoxin and pentylenetetrazole induced seizures in mice. Experiments were carried out on male albino mice and the animals were randomly allotted to the different control and test groups. The extract, at a dose of 200 mg/kg, prolonged the onset of seizures from strychnine, picrotoxin and pentylenetetrazole in the animals. Acute toxicity testing produced a medial lethal dose of 17.5 g/kg. Phytochemical screening of the plant reveals the presence of alkaloids, saponins, tannins and reducing sugars. The results indicate a possible efficacy potential of the aqueous leaf extract of R. vomitoria in convulsions.[...] Read More.
Keywords: Rauvolfia vomitoria, convulsion, phytochemical, acute toxicity.
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Md. Mokarram Hossain*, Israt Jahan Biva, Rumana Jahangir and Md. Mynol Islam Vhuiyan
Abstract: In the present study, we have investigated the possible CNS (Central Nervous System) depressant and analgesic action of the methanol extract of Aphanamixis polystachya leaf. Its CNS depressant activity was evaluated by using thiopental sodium- induced sleeping time, hole cross and open field tests. The analgesic activity was also investigated for its central and peripheral pharmacological actions using hot plate and tail immersion test and acetic acid -induced writhing test in mice respectively. The extract decreased the motor activity and exploratory behavior of mice in hole cross and open field test (p < 0.001). Moreover, the extract significantly maximized the duration of sleeping time when administered with thiopental sodium (p < 0.001). The extract, at the dose of 250 and 500 mg/kg, produced a significant (p < 0.05, p < 0.001) increase in pain threshold both in hotplate and tail immersion methods in a dose dependent manner. The results were comparable to the reference standard Nalbuphine. In acetic acid-induced writhing test, the extract (500 mg/kg) produced a maximum of 75.9% inhibition (p < 0.001) of writhing reaction compared to the reference drug Diclofenac-Na (10 mg/kg) (78.1%). These results suggest that the extract possesses strong CNS depressant and analgesic activity in mice.[...] Read More.
Keywords: Aphanamixis polystachya, CNS depressant activity, analgesic activity.
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M. Moshahid A. Rizvi*, Irshad M., Gamal El Hassadi and Salaem Ben Younis
Abstract: Cassia fistula Linn, a semi-wild Indian labrum has been used in the treatment of various diseases in different parts of the world since time immemorial. In Indian literature there has been multiple descriptions regarding its usefulness in the treatment of various diseases. Some authors have reported its antibacterial, antioxidant, hepatoprotective and hypoglycemic potentials. Many other authors have indicated towards the free radical scavenging and antioxidant potential of C. fistula both in vitro as well as in vivo. Despite this valuable available information on this plant there appears a vast virgin area of research on this plant to find out the real natural treasure. The antioxidant and hepatoprotective nature of Cassia fistula seems to depend on the total phenolic, proanthocyanidin and flavanoid contents of this labrum. This paper reviews all the experimental studies so far performed on C. fistula. This is likely to have important implications on designing any future research on this plant for their potential utility in herbal drug system or in nutritional supplements.[...] Read More.
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Keji Tang*, Ruixin Nie, Longjun Jing, and Quansheng Chen
Abstract: To study the anti- athletic fatigue effects of saponins from American ginseng (SAG), male Kunming mice were randomized into 4 groups equally based on body weight after one week adoption, and they are: C group (control mice given distilled water for 14 days), LS group (mice treated SAG with 50 mg/kg for 14 days), MS group (mice treated SAG with 100 mg/kg for 14 days) and HS group (mice treated SAG with 200 mg/kg for 14 days). The C group was given distilled water and LS, MS; HS groups were given various doses of SAG (50, 100, 200mg/kg) for 14 consecutive days. The levels of lactate, serum urea nitrogen, liver glycogen, muscle glycogen, the swimming endurance time and body weight were determined before and after swimming test. Different doses of SAG significantly lengthened the swimming endurance time and increased the levels of liver glycogen and muscle glycogen, while reducing the levels of lactate significantly compared with control group, especially in the MS group. Our data demonstrated SAG has noticeable anti-athletic fatigue effect on mice. These effects were dose-dependent, and the strongest effect on most biomarkers was seen with 100 mg/kg dose.[...] Read More.
Keywords: Saponins, American ginseng, anti-athletic fatigue activity.
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O. A. Aiyegoro, A. J. Afolayan and A. I. Okoh*
Abstract: This study has been done to evaluate the interactions between acetone, chloroform, ethyl acetate and methanol extracts of Helichrysum longifolium in combination with six first-line antibiotics comprising of Penicillin G sodium, Amoxicillin, Chloramphenicol, Oxytetracycline, Erythromycin and Ciprofloxacin using both the time-kill and the chequerboard methods and against a panel of bacterial isolates comprised of referenced, clinical and environmental strains. The time-kill method revealed the highest bactericidal activity exemplified by a 6.7 Log 10 reduction in cell density against Salmonella spp. when the extract and Penicillin G are combined at ½ × MIC. Synergistic response constituted about 65%, while indifference and antagonism constituted about 28.33% and 6.67% in the time kill assay, respectively. The chequerboard method also revealed that the extracts improved bactericidal effects of the antibiotics. About 61.67% of all the interactions were synergistic, while indifference interactions constituted about 26.67% and antagonistic interactions was observed in approximately 11.66%. These suggest that the crude extracts of the leaves of H. longifolium could be potential source of broad spectrum antibiotics resistance modifying compounds.[...] Read More.
Keywords: Synergism, antibiotics, extracts, chequerboard, time-kill.
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Victor de Andrade*, Katijah Khoza-Shangase* and Fatima Hajat*
Abstract: This project sought to obtain information regarding the perceptions of oncologists with regards to the ototoxic effects of cancer chemotherapy. Ten oncologists from 2 public hospitals in Gauteng participated in this project. Data were collected from self- administered questionnaires completed by participants. Using a qualitative and quantitative paradigm, data analysis utilized content analysis and descriptive statistics. Only 50% of the participants reported referring patients for audiological management during the chemotherapeutic process. None of the respondents reported having protocols in place for ototoxicity monitoring. Therefore, it appears as though ototoxicity and the role of the audiologist are not fully realized within the sample in the current study. Furthermore, it would seem as though oncologists need to be aware of ototoxicity; the role of the audiologist; and the need to include an audiologist in the oncology team. Results from the current study highlight the need for establishment and implementation of protocols and ototoxicity monitoring programmes in government hospitals in Gauteng.[...] Read More.
Keywords: South Africa, cancer, chemotherapy, ototoxicity, sensory neural hearing loss.
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