Sylvester Addai-Arhin
Kumasi Polytechnic, Pharmaceutical science, Faculty Member
- I am a very professional person who loves to learn, teach and researchedit
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Research Interests:
Sulfadoxine and pyrimethamine are often formulated together and used in the treatment of malaria especially in pregnant women serving as a prophylaxis. A new simple, precise and accurate reverse-phase high-performance liquid... more
Sulfadoxine and pyrimethamine are often formulated together and used in the treatment of malaria especially in pregnant women serving as a prophylaxis. A new simple, precise and accurate reverse-phase high-performance liquid chromatography (RP-HPLC) method has been developed for simultaneous identification and quantification of sulfadoxine and pyrimethamine in tablet dosage form. The analysis was carried out on Waters uBondapak C18 Column (39 × 300 mm, 3.6 µm) with acetonitrile: phosphate buffer (75:25 v/v) as the mobile phase at pH of 2.5, and a flow rate of 1.0 mL/min and a detection wavelength of 230 nm. Sulfadoxine and pyrimethamine eluted at mean times of 2.86 and 3.60 min, respectively. The method was linear with r2 values of 0.9976 and 0.9841 for sulfadoxine and pyrimethamine, respectively (range 31.25–500 µg/mL). The method was accurate (97.06 ± 2.23% and 99.81 ± 1.93% for sulfadoxine and pyrimethamine, respectively), precise, specific, robust, sensitive and cost effective. ...
Research Interests: Chemistry, Analytical Chemistry, Pharmacy, Chromatography, Pharmaceutical Chemistry, and 15 moreLinear models, Quality Control, Dosage Form, Pharmaceutical, Animals, Male, Rats, Reproducibility of Results, Food Sciences, Imidazoles, Flow Rate, Sensitivity and Specificity, Drug Stability, Pharmacology and pharmaceutical sciences, and limit of detection
A thesis submitted to the Department of Chemistry, Faculty of Physical Science, College of Science, Kwame Nkrumah University of Science and Technology in partial fulfilment for the requirements for the degree of Master of Philosophy in... more
A thesis submitted to the Department of Chemistry, Faculty of Physical Science, College of Science, Kwame Nkrumah University of Science and Technology in partial fulfilment for the requirements for the degree of Master of Philosophy in Analytical Chemistry, 2015
Research Interests:
Mercury (Hg), cadmium (Cd), and lead (Pb) concentrations in marketed cigarettes from South Korea, Vietnam, Japan, Indonesia, Taiwan, Thailand, the United Kingdom (UK), Belgium, Italy, Finland, and France were investigated. The cigarettes... more
Mercury (Hg), cadmium (Cd), and lead (Pb) concentrations in marketed cigarettes from South Korea, Vietnam, Japan, Indonesia, Taiwan, Thailand, the United Kingdom (UK), Belgium, Italy, Finland, and France were investigated. The cigarettes from Vietnam and Thailand had the highest trend of Hg. Meanwhile, Cd was found higher in cigarettes from Thailand, the UK, and Belgium. Pb concentrations in cigarettes from Belgium, the UK, and Korea were higher than others. The average of these heavy metals concentrated in cigarettes was in the order of Pb > Cd > Hg. Furthermore, the contents of these heavy metals in cigarette leaves were much higher than in filter and rolling paper. There was a significant positive correlation between Hg and Cd, but no correlation between Cd and Pb and between Hg and Pb. Significant positive correlations of nicotine with Hg and Cd but not Pb in the cigarette were observed. Activated carbon filters (Ce-C) absorb Cd and Pb from cigarette leaves and rolling pap...
Research Interests:
Urban dust has been contaminated with toxic heavy metals from various diffused sources. On August 28, 2019, the compact fluorescence lamp (CFL) factory that generates light for Rang Dong Light Source and Vacuum Flask in Hanoi City in... more
Urban dust has been contaminated with toxic heavy metals from various diffused sources. On August 28, 2019, the compact fluorescence lamp (CFL) factory that generates light for Rang Dong Light Source and Vacuum Flask in Hanoi City in Vietnam was accidentally fired. The assessment for Hg contamination and its human health impact 2 months after the incident was conducted in autumn 2019. The heavy Hg pollution is still found near CFL. Additionally, localized Hg pollution by air and wind direction was identified at sites in the northeast direction from CFL. Namely, in the area located downstream of the southwest monsoon wind, Hg had a trend higher than other directions. The hazard quotient (HQ) and the hazard index (HI) were evaluated by four routes of Hg exposure pathways. The HI values for children and adults in the most polluted site (Site 15) were 0.968 and 0.468, respectively. This meant that children who lived around this site and commuted to schools were the most at risk regardin...
Research Interests:
Chlorpheniramine maleate–paracetamol–caffeine tablet formulation is one of the common over-the-counter drugs used for the treatment of cold and cough. A reversed-phase high-performance liquid-chromatography method has been successfully... more
Chlorpheniramine maleate–paracetamol–caffeine tablet formulation is one of the common over-the-counter drugs used for the treatment of cold and cough. A reversed-phase high-performance liquid-chromatography method has been successfully developed for the simultaneous determination of chlorpheniramine maleate, paracetamol and caffeine in a drug formulation. The RP-HPLC method employed a Phenomenex C18 reversed phase column (Luna 5μ, 250 × 4.6 mm) with an isocratic mixture of methanol and 0.05 M dibasic phosphate buffer pH 4.0 in the ratio of (30:70; v/v) as the mobile phase. The column temperature was kept at 30 °C. The flow rate was 1.0 mL/min and detection was by means of a UV detector at wavelength of 215 nm. All the active components were successfully eluted with mean retention times of 2.4, 4.2, 7.2 min for chlorpheniramine maleate, paracetamol and caffeine respectively. The method was found to be linear (R2 > 0.99), precise (RSD < 2.0 %), accurate (recoveries 97.9–102.8 %), specific, simple, sensitive, rapid and robust. The validated method can be used in routine quality control analysis of fixed dose combination tablets containing chlorpheniramine maleate, paracetamol and caffeine without any interference by excipients.
Keywords: Chlorpheniramine maleate, Paracetamol, Caffeine, RP-HPLC, Tablet formulations, Cyanocobalamin,
Multi-component formulation
Keywords: Chlorpheniramine maleate, Paracetamol, Caffeine, RP-HPLC, Tablet formulations, Cyanocobalamin,
Multi-component formulation
Research Interests:
Acetylsalicylic acid and paracetamol are often formulated together in combination with caffeine, an adjuvant, for the relief of pain, fever and inflammations. A new RP-HPLC method with PDA detection has been developed and validated for... more
Acetylsalicylic acid and paracetamol are often formulated together in combination with caffeine, an adjuvant, for the relief of pain, fever and inflammations. A new RP-HPLC method with PDA detection has been developed and validated for the simultaneous estimation of acetylsalicylic acid, paracetamol and caffeine in fixed dose combination tablets. A Brownlee analytical column RP-C8 (5 µm, 150 x 4.6 mm) was used as the stationary phase and a mobile phase composed of acidic water/methanol mixture (60/40 v / v). Isocratic elution was employed. All the three components were eluted within 5.5 minutes with retention times of 2.05 ± 0.0062 for Paracetamol, 2.45 ± 0.0030 for Caffeine, and 5.03 ± 0.0140 for acetylsalicylic acid. The method was found to be accurate with mean recoveries of 99.39 ± 1.58 %, 99.69 ± 1.45 % and 100.56 ± 1.60 % for acetylsalicylic acid, paracetamol and caffeine respectively. It was also found to be linear (R 2 ˃ 0.99), precise (RSD ˂ 2.0), specific, robust, sensitive and cost effective. Two brands of tablets containing the three active ingredients were successfully assayed by the validated method. The validated method can be used in routine quality control analysis of fixed dose combination tablets containing these three active ingredients.