Papers by Zuriati B Zakaria
The objective of this study was to develop a method for the determination of diuron (3-(3,4-dichl... more The objective of this study was to develop a method for the determination of diuron (3-(3,4-dichlorophenyl)-1,1-dimethyl urea) residue in crude palm oil (CPO) and crude palm kernel oil (CPKO) matrices. The method involves the extraction of the herbicide from the oil matrix using low temperature precipitation and solid phase extraction techniques, detected by high performance liquid chromatography-ultra violet (HPLC-UV). The HPLC separation was carried out on an Ascentis TM RP-Amide column and elution with acetonitrile (solvent A) and water-methanol (2:1, v/v) (solvent B) as a suitable solvent system, at ratio of 4:6 (v/v). The optimum volume of acetonitrile for the extraction of diuron was 30 mL and 4 mL was obtained as the optimum volume of the solvent for elution analyte through the SPE cartridge. A linear correlation was obtained for the concentration of diuron from 0.05-1.0 µg mL-1 with a correlation coefficient of 0.99. The recovery of diuron from CPO was 83.2-101.4% with a relative standard deviation of 1.4-9.9% and 79.4-87.9% with relative standard deviation of 0.9-5.6% for CPKO. The method detection limit and limit of quantification obtained were 0.018 µg g-1 and 0.058 µg g-1 , respectively. The method was used to determine diuron residues in palm oil from different refineries situated at different locations throughout Malaysia.
Molecules, 2011
Background and objective: Cassia fistula is widely used in traditional medicine to treat various ... more Background and objective: Cassia fistula is widely used in traditional medicine to treat various types of ailments. The evaluation of toxic properties of C. fistula is crucial when considering public health protection because exposure to plant extracts can result in undesirable effects on consumers. Hence, in this study the acute oral toxicity of C. fistula seeds extract was investigated in mice. Results: Oral administration of crude extract at the highest dose of 5000 mg/kg resulted in no mortalities or evidence of adverse effects, implying that C. fistula in nontoxic. Throughout 14 days of the treatment no changes in behavioural pattern, clinical sign and body weight of mice in both control and treatment groups. Also there were no any significant elevations observed in the biochemical analysis of the blood serum. Further, histopathological examination revealed normal architecture and no significant adverse effects observed on the kidney, heart, liver, lung and spleen. Conclusions: Overall, the results suggest that, the oral administration of C. fistula methanolic seeds extract did not produce any significant toxic effect in mice. Hence, the extract can be utilized for pharmaceutical formulations.
Bioresource Technology, 2012
Researchers, policymakers, academics, students and the broader community active in contributing s... more Researchers, policymakers, academics, students and the broader community active in contributing solutions to the myriad of environmental questions posed by the challenges facing environmental sustainability are the consistent participants of CESE series. CESE Series aim at making significant contribution to ''Sustainable Growth'' and this could only be possible if scientists and engineers were worked together. This will pave way for further interactions with other stakeholders who are as important as the previous two to find ways for complete solutions. Sustainable growth could only be achieved if the complex interactions among many processes were understood and the sustainability is considered in all those processes. Sustainability of fresh water and other resources as well as energy should be emphasized for sustainable growth. Better management of catchments and cleaner production are important criteria for the sustainability of fresh water and other resources. Sustainability of energy depends on innovative applications of renewable energy sources. CESE-2008 was the first of the series that was held at James Cook University, Townsville, Australia with a core group of international researchers some of whom were research collaborators and had come to participate in a workshop for a project funded to Jegatheesan and Shu by the Sugar Research and Development Corporation. Emeritus Professor Roger Ben Aim who was one of the research collaborators of the above mentioned project was instrumental in the initiation of CESE series and was made Honorary Chairman of the series. CESE-2011 kicked-off on the 25th of September with ''welcome drinks'' session in the evening. The conference began on the 26th of September, with the morning session dedicated to keynote speeches.
Environmental Conservation, 2014
SUMMARYThere is a need for coordinated research for the sustainable management of tropical peatla... more SUMMARYThere is a need for coordinated research for the sustainable management of tropical peatland. Malaysia has 6% of global tropical peat by area and peatlands there are subject to land use change at an unprecedented rate. This paper describes a stakeholder engagement exercise that identified 95 priority research questions for peatland in Malaysia, organized into nine themes. Analysis revealed the need for fundamental scientific research, with strong representation across the themes of environmental change, ecosystem services, and conversion, disturbance and degradation. Considerable uncertainty remains about Malaysia's baseline conditions for peatland, including questions over total remaining area of peatland, water table depths, soil characteristics, hydrological function, biogeochemical processes and ecology. More applied and multidisciplinary studies involving researchers from the social sciences are required. The future sustainability of Malaysian peatland relies on coor...
Digest Journal of Nanomaterials and Biostructures, 2016
Silver nanoparticles (Ag-NPs) have been successfully synthesized using ultrasound irradiation in ... more Silver nanoparticles (Ag-NPs) have been successfully synthesized using ultrasound irradiation in the sodium alginate media. AgNO3 and ultrasound irradiation have been used as silver precursor and physical reducing agent to accelerate the synthesis of Ag-NPs. The presence of Ag-NPs can be detected from the changing color of the suspensions. The silver ion reduction was confirmed through the surface plasmon resonance absorption at around 446 nm. The spherical shape and an average diameter of 24. 59 nm were observed by using Transmission Electron Microscopy. The XRD pattern was assigned that the sodium alginate/Ag-NPs is crystalline in nature with fcc planes. The FT-IR spectra shows that the Ag-NPs do not appear many different with sodium alginate due to van der Waal forces. Therefore, this Ag-NPs using sodium alginate can be an alternative in the metal nanoparticles synthesis due to green and speedy method. Moreover, these nanoparticles can apply in many applications such as anti-micr...
The Journal of general and applied microbiology, Jan 6, 2018
The emergence of antibiotic resistance among multidrug-resistant (MDR) microbes is of growing con... more The emergence of antibiotic resistance among multidrug-resistant (MDR) microbes is of growing concern, and threatens public health globally. A total of 129 Escherichia coli isolates were recovered from lowland aqueous environments near hospitals and medical service centers in the vicinity of Kuala Lumpur, Malaysia. Among the eleven antibacterial agents tested, the isolates were highly resistant to trimethoprim-sulfamethoxazole (83.7%) and nalidixic acid (71.3%) and moderately resistant to ampicillin and chloramphenicol (66.7%), tetracycline (65.1%), fosfomycin (57.4%), cefotaxime (57.4%), and ciprofloxacin (57.4%), while low resistance levels were found with aminoglycosides (kanamycin, 22.5%; gentamicin, 21.7%). The presence of relevant resistance determinants was evaluated, and the genotypic resistance determinants were as follows: sulfonamides (sulI, sulII, and sulIII), trimethoprim (dfrA1 and dfrA5), quinolones (qnrS), β-lactams (ampC and blaCTX-M), chloramphenicol (cmlA1 and cat...
Microbes and environments, Jan 28, 2018
A soil cooling system that prepares soil for temperate soil temperatures for the growth of temper... more A soil cooling system that prepares soil for temperate soil temperatures for the growth of temperate crops under a tropical climate is described herein. Temperate agriculture has been threatened by the negative impact of temperature increases caused by climate change. Soil temperature closely correlates with the growth of temperate crops, and affects plant processes and soil microbial diversity. The present study focuses on the effects of soil temperatures on lettuce growth and soil microbial diversity that maintains the growth of lettuce at low soil temperatures. A model temperate crop, loose leaf lettuce, was grown on eutrophic soil under soil cooling and a number of parameters, such as fresh weight, height, the number of leaves, and root length, were evaluated upon harvest. Under soil cooling, significant differences were observed in the average fresh weight (P<0.05) and positive development of the roots, shoots, and leaves of lettuce. Janthinobacterium (8.142%), Rhodoplanes (...
Bioscience, biotechnology, and biochemistry, Jan 6, 2017
The natural coagulant Moringa oleifera lectin (MoL) as cationic protein is a promising candidate ... more The natural coagulant Moringa oleifera lectin (MoL) as cationic protein is a promising candidate in coagulation process of water treatment plant. Introducing the gene encoding MoL into a host, Pichia pastoris, to secrete soluble recombinant protein is assessed in this study. Initial screening using PCR confirmed the insertion of MoL gene, and SDS-PAGE analysis detected the MoL protein at 8 kDa. Cultured optimization showed the highest MoL protein at 520 mg/L was observed at 28 °C for 144 h of culturing by induction in 1% methanol. Approximately, 0.40 mg/mL of recombinant MoL protein showed 95 ± 2% turbidity removal of 1% kaolin suspension. In 0.1% kaolin suspension, the concentration of MoL at 10 μg/mL exhibits the highest turbidity reduction at 68 ± 1%. Thus, recombinant MoL protein from P. pastoris is an effective coagulant for water treatment.
Journal of the Chemical Society Chemical Communications, 1979
J Essent Oil Res, 1990
ABSTRACT: The wood oil of Cinnamomum parthenoxylon of Malaysian origin, which was produced in 1 .... more ABSTRACT: The wood oil of Cinnamomum parthenoxylon of Malaysian origin, which was produced in 1 .O% yield, was found to contain methyl eugenol(45%) and safrole (20%). ... KEY WORD INDEX: Cinnamomum parthenoxylon, Lauraceae, wood oil com-position, phenyl ethers.
This paper discuss the application of amficial neural network (ANN) for the qualitative determina... more This paper discuss the application of amficial neural network (ANN) for the qualitative determination of fatty adds and p-carotene based on their pattem recognition of FTIR and UV-vis spectra. Six types of different fatty acids and 33 different concentrations of p-carotene samples were used in this study. For fatty acid analysis, FTIR spectra were measured at 400-4000 ct" while for p-carotene the wavelenght at 440-46Onm was selected. The ANN performance was very successful in predicting fatty add and p-carotene content, where good precision and accuracy results were obtained.
Sains …, 2012
Marine fungus Fusarium proliferatum derived from marine sponge collected along Pulau Tinggi, Mala... more Marine fungus Fusarium proliferatum derived from marine sponge collected along Pulau Tinggi, Malaysia was cultivated on Potato Dextrose Broth and incubated for 7 days at 30 o C. The liquid cultures were then extracted using ethyl acetate. The crude ...
Page 1. Implementation of a Water Vision - In the case of Langat River, Malaysia By: Line Madsen ... more Page 1. Implementation of a Water Vision - In the case of Langat River, Malaysia By: Line Madsen Maria Eva Hansen Maria Reumert Gjerding Signe Pedersen Malaysian supervisors: Professor Zuriati Zakaria and Dr. Maimon Abdullah ...
infosvr.moh.gov.my
Page 1. INSTITUT PENYELIDIKAN PERUBATAN I . M . R VOLUME 1 MALAYSIAN HERBAL MONOGRAPH IMR ____ In... more Page 1. INSTITUT PENYELIDIKAN PERUBATAN I . M . R VOLUME 1 MALAYSIAN HERBAL MONOGRAPH IMR ____ Institute for Medical Research____ Page 2. MALAYSIAN HERBAL MONOGRAPH Volume 1 Contributors Assoc. Prof. ...
Plant Protection …, 2008
Abstract: Persistence of carbofuran in two Malaysian soils namely the Bagan Datoh and Labu soils ... more Abstract: Persistence of carbofuran in two Malaysian soils namely the Bagan Datoh and Labu soils was studied under laboratory conditions at a constant temperature of 30 C. Air-dried soil was sieved and then spiked with 10 g g-1 of carbofuran at three different moisture levels, ...
The presence of geosmin and 2-methylisoborneol (2-MIB) becomes an increasing concern as they are ... more The presence of geosmin and 2-methylisoborneol (2-MIB) becomes an increasing concern as they are known to cause earthy or musty odor in freshwater environments. Geosmin and 2-MIB outbreaks in Malaysia are not well understood and since Malaysia has a stable temperature throughout the year, no information has been reported on effect of temperature to the odor production. In this study, 6 isolated strains were selected for study of the effect of temperature (20, 25, 30, 35, 40, 45 & 50°C) on geosmin and 2-MIB production. Preliminary results indicate that at temperature 30 °C, Strain 5 showed highest geosmin production (129.06 µg/L) and Strain 2 produced highest 2-MIB (19.89 µg/L). PCR band was obtained in a test whether these isolated strains had geoA gene or not.
The electrochemical degradation kinetics of diclofenac (DCF) using graphite–PVC composite as anod... more The electrochemical degradation kinetics of diclofenac (DCF) using graphite–PVC composite as anode was assessed in pure water and effluent wastewater. Effects of initial concentration of diclofenac, chloride ion (Cl −) loading, type of sample and applied voltage were determined to test and validate a kinetic model for the oxidation of diclofenac by the electrochemical oxidation process. The results revealed that the electrochemical oxidation rates of diclofenac followed pseudo first-order kinetics. The rate constant values ranged from 0.018 to 0.173 /min, depending on the operating parameters. However, 6 V and 4 g/L NaCl were selected for further experiments (96.9% removal of diclofenac and 0.0078 kWh/g diclofenac consumption energy) after 30 min and at 20 mg/L of diclofenac. High consumption energy (0.0303 kWh/g diclofenac) was accompanied with high applied voltage of 10 V so it was not considered in this study. Liquid chromatography time-of-flight mass spectrometry (LC–ToF/MS) was used for the elucidation of the main transformation products (TPs) which are resulted from the degradation of diclofenac (DCF) during the application of graphite–PVC composite as anode in aqueous matrices. The toxicity of DCF and its TPs was assessed against E. coli bacteria at different incubation time.
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Papers by Zuriati B Zakaria