Fazlena Hamzah

Fazlena Hamzah
Universiti Teknologi MARA | UiTM · department of Bioprocess

About

73
Publications
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589
Citations
Citations since 2017
47 Research Items
451 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100

Publications

Publications (73)
Article
Full-text available
Biodiesel is increasingly being considered as an alternative to the fossil fuel as it is renewable, nontoxic, biodegradable, and feasible for mass production. Biodiesel can be produced from various types of vegetable oils. Calophyllum inophyllum seed oil (CSO) is among the prospective nonedible vegetable oils considered as a raw material for biodie...
Article
Full-text available
Carbon dioxide (CO2) released from fossil fuel industries into the atmosphere had contributed to the global warming effect and climate change. The development of CO2 separation process through membrane technology had been introduced to capture CO2 from the flue gas. Integration between membrane technology with the biological approach using carbonic...
Article
Full-text available
This research aims to formulate a disinfectant from citrus waste-infused used cooking oil through the conventional process and evaluate its effectiveness in microbial elimination. Fourier Transform Infrared Spectroscopy (FTIR) and Gas Chromatography-Mass Spectrometry (GC-MS) were utilized to characterize citrus waste-infused used cooking oil. Two p...
Article
This paper presents the utilization of bamboo residue from the chopstick industry as modified carbon (AC) for supercapacitor application. Bamboo activated carbon (BAC) was activated using Potassium hydroxide (KOH) and assisted with microwave ultrasonic (Mw-U) irradiation to enhance the properties of bamboo activated carbon (BAC). Different microwav...
Article
Full-text available
Application of essential oils (EOs) in food preservation and products is not a virgin trend owing to its bio-functional properties such as antioxidants, antimicrobials, medicinal values, and aromatic functionalities. However, EOs are prone to degrade upon exposure to different environmental surroundings, eventually losing their bio-functional activ...
Article
Full-text available
Nyamplung seed (Calophyllum inophyllum L.) oil is a prospective non-edible vegetable oil as biodiesel feedstock. However, it cannot be directly used in the alkaline catalysed transesterification reaction since it contains high free fatty acid (FFA) of 19.17%. The FFA content above 2% will cause saponification reaction, reducing the biodiesel yield....
Article
Ocean Thermal Energy Conversion (OTEC) harnesses thermal energy stored at different seawater depths via power generation from a thermodynamic closed-loop cyclical system. Apart from its consistent energy generation, it could be diversified into other side industries, making OTEC an attractive and sustainable source of renewable energy. However, the...
Article
Full-text available
In this research, TiO2 thin films were prepared using a simple sol-gel spin coating process. The films were characterized using Field Emission Scanning Electron Microscopy (FE-SEM), Energy Dispersive Ray (EDX), X-ray diffraction (XRD) and Ultraviolet–visible Spectrophotometer in order to investigate the influence of different annealing temperatures...
Conference Paper
Biopolymer films have attracted interest in food preservation and packaging. Moisture content is a necessity to determine product stability at different storage conditions. In order to understand the behavior of film at different environmental conditions, moisture sorption isotherm at various water activity should be performed. The moisture sorptio...
Article
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Eco Processed Pozzolan (EPP) is derived from Spent Bleaching Earth (SBE) by the calcination process via heat treatment in the palm oil refining industry. EPP can be used as a partial replacement of cement as it contains a high amount of silica and has pozzolanic properties. Besides its properties, the sustainable production of EPP in the palm oil i...
Article
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Pancreatic lipase inhibitory compounds (gallic acid and quercetin) and their inhibition properties were determined in the crude extract of matured leaves from widely grown Aquilaria spp. in Malaysia, which are Aquilaria malaccensis and Aquilaria subintegra. The leaves were dried at 60 °C for 24 hours and undergone a pre-treatment method by using ul...
Article
Full-text available
Gallic acid and quercetin equivalent were determined in the crude extract of matured leaves Aquilaria malaccensis and Aquilaria subintegra. The leaves of both Aquilaria species were dried at 60 °C for 24 hours, ground and sieved into particle size of 250, 300, 400, 500, and 1000 µm. Then, each particle size of leaves was soaked in distilled water w...
Article
Full-text available
Biodiesel is fatty acid methyl ester that commonly derived from vegetable oils and animal fats that can be produced through enzymatic transesterification using lipase. In this study, three different types of lipase were used, which are Lipase Immobilized Pseudomonas cepacia, PcL, Thermomyces lanuginosus, TLIM, and Candida Antarctica A (recombinant...
Article
Full-text available
The study was done to determine the effect of Tacca starch loading on production of amylolytic enzyme from Ragi Tapai. In this study, Ragi Tapai was used as a starter to produce amylolytic enzyme. The fermentation was done in a solid state fermentation with the presence of Tacca leontopetaloides starch as the carbon source. The analysis of total su...
Article
Empty fruit bunches fibre (EFB) consisting of 44 % cellulose, 16 % lignin and 35 % hemicelluloses component was treated using microwave-alkali (Mw-A) agitated pre-treatment so as to disrupt the recalcitrant structures in the fibre. Morphology and chemical changes of treated EFB were used as indicators to the effectiveness of Mw-A treatment. The res...
Article
The objective of this paper was to formulate chitosan-starch edible coatings incorporate with turmeric essential oil and plasticized with glycerol using the dip coating technique. The effect of starch on surface tension and turmeric essential oil amounts on firmness and weight loss of the strawberries were studied. The adhesion properties of coatin...
Article
Until recently, the rib of the leaflets of the oil palm tree was only used for making brooms due to its stiffness and durability. However, the mechanical properties of this fibre are unknown. Due to the geometrical variation of the cross-section of the fibres along their length, this study divided them into 4-categories. The result of this study re...
Article
Biopolymer film has attracted interest in food preservation and packaging. In order to obtain biopolymer film of good characteristics, rheological properties of film forming solution is important. In this study, the rheological properties of cassava starch film forming solution incorporated with kaffir lime oil were determined. The flow behavior me...
Article
Full-text available
Rheology of film solution is important to determine the final characteristics of biopolymer film as packaging material. In this study, the dynamic rheological properties of cassava starch-kaffir lime oil film solution were determined. The rheology measurement was made at frequency of 0.1 to 10 Hz and 1 % strain at 25 °C. The storage modulus (G’), l...
Article
Full-text available
Simulated Body Fluid (SBF) solution has been used in biomimetic apatite coating. In some cases, the apatite formation on the metallic surface may take up to 4 weeks in SBF solution. Increasing the concentration of SBF seems to work in shortening the period of apatite formation yet the high concentration of unstable SBF solution is not easy to handl...
Article
Full-text available
Transesterification of waste cooking oil (WCO) for fatty acid methyl ester synthesis using calcium oxide (CaO) as a catalyst with absence and presence of free fatty acid (FFA) pretreatment (untreated and pretreated) prior to reaction have been investigated. The preliminary study was started from theoretical stoichiometric amount molar ratio of meth...
Article
Full-text available
Edible coating is a thin layer on the surface that is used to extend shelf life of the fruit. The characteristics of the materials used and the properties of each substance in the coating solution will affect the quality of the edible coating. In this study, the use of chitosan at different concentrations has been assessed to produce an effective e...
Article
Biodiesel is fatty acid methyl ester derived from vegetable oils and/or animal fats that react with acyl acceptor. Biodiesel has beneficial in sustaining the healthy environment because of its biodegradable properties, renewable and non-toxic. Biodiesel is produced by transesterification process either with or without the catalyst. Transesterificat...
Article
Full-text available
Curcuma longa L. is one of the commercially planted herbs in Malaysia for its phytochemical benefits. In this study, the effect of chitosan-starch at different concentration of Curcuma longa L. (CUR) were examined. The application of edible coating by using dipping technique has been analysed for their effectiveness in extending shelf life of fruit...
Article
This study aimed to characterize the modified Polysulfone-TiO2 membrane via hydrophilic character, the molecular weight cutoff of the membrane and surface morphology of the membrane. Flat sheet modified Polysulfone membrane was prepared by using the phase inversion technique. N-methylene-2-pyrrolidone (NMP) was used as a solvent to dilute Polysulfo...
Conference Paper
Titanium dioxide (TiO2) powder was synthesized via sol-gel technique using Titanium tetraisopropoxide (TTIP) and ethanol as precursors. Acetylacetone, distilled water, polyethylene glycol (PEG) and stabilizers (glacial acetic acid and nitric acid) were then added to the solution. The solution was left for ageing for 24 hours and then dried into pow...
Conference Paper
Titanium dioxide (TiO2) is a well-known materials and being extensively investigated due to the stability of the chemical structure, optical, physical, and electrical properties, also its biocompatibility. There are a lot of efforts have been done to synthesis TiO2 since the previous years by using different kind of methods. In this review paper, w...
Article
Full-text available
Colorant is one of the additives to give a better appearance or improve the colour of the product. Synthetic colorant has been widely used in industrial due to its readiness in the market and its colour stability. However the arising issues related to the safety, nutrition and also the therapeutic effect has encouraged users to become more concern...
Article
Full-text available
Titanium dioxide (TiO2) thin films were prepared via sol gel method using different concentration of glacial acetic acid and nitric acid. The deposition of TiO2 gel on the ITO substrate was conducted using spin coating techniques at a rate of 3,000 rpm for 30 s and was calcinated at 500oC for 10 minutes. The study was conducted to determine the sur...
Article
Full-text available
Commercialised calligraphy inks are currently formulated for general purposes and is not to be practiced solely for the writings of Al-Quran. Thus the usage on Al-Quran is uncertain due to the unknown ingredients used. The virtue of this work is to develop halal and genuine formulations of black inks for calligraphy purpose in the production of Al-...
Article
Full-text available
Heating value has been one of the important properties of gasoline surrogate fuel being investigated for thermal conversion system inside combustion cylinder. Alternative fuel yielded from biomass is expected to have lower energy content than baseline fuel (gasoline), as several factors were analysed such as molecular structure and carbon contents....
Conference Paper
Full-text available
The effect of N, S Co-doped TiO2 concentration on photocatalytic degradation of phenol was investigated. The photocatalyst were prepared using sol-gel method with different concentration of dopant ranging from 0.5% to 1.0%. The precursor of titania was Titanium (IV) isopropoxide (TTIP) while the sources of nitrogen and sulfur were ammonium nitrate...
Article
Full-text available
p>The aim of this paper is to discuss on the preservation of bioactive compound by using microencapsulation techniques. Microencapsulation is a process of building a functional barrier between the core and wall material to prevent any chemical or physical reactions. Microencapsulation provides an important technique in various food, pharmaceutical...
Article
Full-text available
Carbonic Anhydrase (CA) was immobilized onto Amberlite XAD 7 and was used in carbon dioxide sequestration purposes. The catalytic activities for free and immobilized CA were estimated by using para-Nitrophenyl Acetate (p-NPA) as the substrate in Tris-buffer containing 10% of acetonitrile. Lineweaver-Burk plot was employed to estimate the Michaelis-...
Article
Full-text available
The ability of chitosan-starch based coating to extend shelf life of strawberry were studied. The main objectives of this paper is to study the effects of different concentrations (20, 15, 10 and 5 µL) of Curcuma longa L. (CUR) essential oil into chitosan-based edible coating on surface tension in order to increase the effectiveness of the coating....
Article
Full-text available
The study on the effect of catalyst loading of photocatalytic degradation of phenol by using N, S co-doped TiO2 was investigated. The precursor of titania was Titanium (IV) isopropoxide (TTIP), while the sources of Nitrogen and Sulfur were ammonium nitrate and thiourea respectively. The photocatalyst were prepared by using dopant concentration at 1...
Article
In present study, the activated carbon was produced from carbonaceous material which are bamboo and rubber seed shell. The sample were prepared with different type of chemical agents; phosphoric acid (H3PO4) and potassium hydroxide (KOH), sulphuric acid (H2SO4) and potassium hydroxide (KOH) for Rubber Seed Shell (RSS) and Bamboo, respectively with...
Article
Immobilization of enzymes is beneficial in terms of improving the process economics by enabling an enzyme reusability and enhancing overall productivity and robustness. Increasingly, membranes are thought to be good supports for enzyme immobilization. Unfortunately, the available commercial membranes require modifications to make them suitable for...
Article
Carbon capture by using carbonic anhydrase (CA) enzyme has become an alternative and environmental friendly approach in carbon sequestration technology. Among various form of CA, immobilized CA onto the support materials offer better behaviour of enzyme including enhance enzyme stability, increase biocatalytic activity and improved enzyme reusabili...
Article
A high biocompatibility apatite coated titanium (Ti) could be achieved by biomimetic method. The method is beneficial in surface modification by lowering the processing cost and flexibility. However, the bond between apatite and titanium implant is weak. The structure and composition of apatite formed is different from the apatite in bone. The aim...
Article
Full-text available
The main objective of this paper is to study the coating adhesion of edible coating incorporated with active ingredients from turmeric essential oil on cherry tomatoes. The effects of different concentrations (20, 10, 5, 2.5, 1.25, and 0.75 μL) of turmeric essential oil into chitosan-based edible coating were evaluated. The sessile drop technique w...
Article
Full-text available
Higher adsorption capacities of activated carbon (AC) can be evaluate according to pore volume, porosity and surface area. AC with higher pore volume, porosity and surface area desired in the present study in order to enhance the properties of AC supercapacitor. Thus, the present studies focus on the chemical activation process to increase the char...
Article
Full-text available
Sugarcane bagasse is an agricultural waste that is potentially used as natural silica resources. Natural silica claimed to be safe in handling, cheap and can be generate from cheap resource. In this study, Santa Barbara Amorphous-15 (SBA-15) was synthesized using sodium silicate that is extracted from Sugarcane bagasse ash (SCBA). Post treatment me...
Article
Full-text available
Coating of apatite in a biomimetic fluid is an alternative technique for metallic coating. Key element for effective biomimetic apatite coating depends on the surface material that can be enhanced by physical and chemical pre-treatment process. Two different preparations of Titanium alloy (Ti6Al4V) have been studied namely as received (as-Ti) and a...
Conference Paper
The combined phenol treatment approaches were carried out in two separate sequences (photo-biodegradation and bio-photodegradation). TiO2/ZnO/N was used in photodegradation part and mixed consortia in biodegradation part. In the sequence where the photocatalytic was employed as a pretreatment, nearly 70% of initial 50 ppm of phenol were removed wit...
Article
Significance of essential oils from Etlingera elatior (E. elatior) are growing these days and have prospective to embrace great export in future, yet the quantity of the essential oil extracted does not extant in decent rate. Therefore the purpose of this research is to determine the optimum yield of the E. elatior essential oil. The E. elatior wer...
Article
Full-text available
Ordered mesoporous silica SBA-15 was prepared using hydrothermal synthesis using sodium silicate (Na2SiO3) as the silica source and amphiphilic block copolymer Pluronic P123 as the structure directing agent. The influence of the mass Na2SiO3, ripening duration, aging time and calcination temperature on the structural and mesoporous properties of si...
Conference Paper
Nannochloropsis oculata, a unicellular green microalgae has become a new prospective for biofuel feedstock which offers a long term of sustainability and energy security. N. oculata accumulate high oil content which is about 28.7-29% oil by biomass weight with the daily oil production of 25.8 mg/day. To enhance the economic feasibility of microalga...
Article
Carbon dioxide is one of the greenhouses gasses that increase yearly and contributed to the global warming and unbalance ecosystem. The main sources for CO2 emission are from transportation, industries and energy generation. The carbon emission from fossil fuel power plant contribute to one-third of total CO2 emission percentage. Generally, there a...
Conference Paper
Full-text available
Faculty of Chemical Engineering (FKK) has been implementing Integrated Project (IP) as one of the element in teaching. It is a defined short project formally introduced to combine assignments given by respective lecturers from 3–4 selected courses, mimicking the final year Chemical Engineering Capstone project but students are asked to present the...
Article
Biomethane is an alternative and renewable source that occurred naturally which produced from the anaerobic digestion of organic matter. It can be used as the electricity power generation, water heating and also vehicle fuel. In this study, the characteristics of the nanosilica of the tapioca peel as an adsorbent on the structural and physical prop...
Article
Full-text available
Renewable energy by using microalgae is another route to solve fossil fuel dependence, reduce climate change and enhance food security. The microalgae has a simple structure. Photosynthesis reaction of the microalgae converts solar energy into chemical energy which later can be used as fuel. This paper reviews microalgae as a new prospective for bi...
Conference Paper
Full-text available
Conversion of biomass waste to a useful product has been extensively studied to compensate its abundance in quantity and combat current environmental pollution issue. Of the biomass listed comes from agriculture industry; empty fruit bunch (EFB). This study was conducted to investigate the suitability of this waste as soil amendment in improving so...
Article
Epipremnum pinnatum is a vegetative, type of vines and climbing plant that can be found in a semitropical and tropical country in South East Asia and Asian region. It has been used as folk remedies due to its medicinal properties and capability in enhancing the immune system. However, limited scientific data are present to support this claim. Thus,...
Article
Full-text available
Momordica charantia is an anti-diabetic which is used as carminative, emmenagogue, in the treatment of colics, as antiviral, anthelmintic, antimalarial and antimicrobic remedy. The Momordica charantia was treated with Aspergillus niger pectinase at various concentration (0-500 U/ml), temperature (4-40°C) and times (0-10 min). Aspergillus niger was...
Article
Paper wastes accumulating in the environment are posing an ever increasing ecological threat. This study aimed to isolate soil bacteria closely associated with the bacteria degrading waste paper. A total of six soil samples were collected from dumped soil hostel garden at Universiti Teknologi MARA, Shah Alam. Bacillus, Aspergillus and Micrococcus s...
Article
A Cellulase and amylase are important enzymes for hydrolysis of cellulose and starchy material into the glucose. The performance of the mixed cellulose-amylase immobilized on polysulfone membrane (PSF) by cross-linked with glutaraldehyde was investigated. PSF membrane consists of 1-methyl-2-pyrolidone (NMP) as a solvent and using polyvinylpyrolidon...
Article
Full-text available
A study was conducted for production of activated carbon (AC) from industrial bamboo waste using carbonization and Microwave-alkali (Mw-A) activation techniques. The aim of the study is to produce activated carbon with higher surface area via Mw-A activation techniques. The study was focused on the effect of activation (KOH soaking and Mw-A) and ca...
Article
The ability of mixed enzyme (ɑ-amylase and cellulase) immobilized via cross-linking method with 3% of glutaraldehyde (GA) on polymeric membrane containing 20 wt% of polysulphone and 80 wt% of 1-methyl-2-pyrrolidone (NMP)/polyvinylpyrrolidone (PVP) to catalyze the complex structure (starch and cellulose) into glucose was investigated in this study....
Article
Pereskia Bleo is commonly used among the local traditional medicine practitioners to prevent or treat cancer by consuming the leaves either raw or taken as a concoction brewed from fresh leaves. However, more research, regulation and standardization are required before herbal medicines can be recommended as effective and safe therapies. The objecti...
Article
Full-text available
Multi-enzymes (alpha-amylase, glucoamylase and cellulase) were successfully encapsulated in calcium alginate-clay beads to hydrolyze cassava roots for glucose production. Under the optimal conditions (2% clay solution and 0.2 M CaCl2), the loading efficiency and the immobilization yield of enzymes were calculated to be 97.07% and 52.14%, respective...
Article
Full-text available
In this paper, the kinetic parameters of free and encapsulated enzymes in the calcium alginate-clay beads were determined using Lineweaver-Burk plot. The Michaelis constant, Km of free alpha-amylase, glucoamylase and cellulase were 2.0831, 1.8326 and 7.8592 mg/mL, respectively, whereas for the encapsulated system, the Km values were 3.1604, 2.1708...
Conference Paper
The aim of this study is to review on mechanism of ultrasonic irradiation in enzymatic esterification reaction, the effect on enzyme activity and stability and also rate of reaction in ultrasonic assisted enzymatic reaction. Conventional enzymatic esterification system using immobilized enzyme generally have a limitation in internal mass transfer t...
Conference Paper
Full-text available
This paper highlights the kinetic parameter of the free and immobilized enzymes (alpha-amylase, glucoamylase and cellulase) systems. The kinetic parameters were calculated using Lineweaver-Burk plot. The Michaelis constant (Km) of free alpha-amylase, glucoamylase and cellulase were 4.542, 1.069 and 9.082 mg/mL, respectively. For the immobilized enz...
Article
Preliminary study on enzymatic hydrolysis process using combination of cellulase and β 1-4 glucosidase on treated oil palm empty fruit bunch fibre (EFB) was performed. Crucial trends for parameters such as pH, temperature and substrate loading influencing the enzymatic hydrolysis of the treated EFB fibre were also studied. Results revealed that a c...
Article
Full-text available
Microwave-alkali (MW-A) pre-treated EFB consisting of 74% cellulose, 16% hemicellulose and 8% lignin was subjected to Simultaneous Saccharification and Fermentation (SSF) of lactic acid using Rhizopus oryzae NRRL 395. Two different morphologies of Rhizopus were studied for SSF of lactic acids; i.e., the clump and pellet form. Aspect Ratio (AR) was...
Article
A lipase catalysed enantioselective hydrolysis process under in situ racemization of the remaining (R)-ibuprofen ester substrate with sodium hydroxide as the catalyst was developed for the production of S-ibuprofen from (R,S)-ibuprofen ester in isooctane. Detailed investigations on parameters study indicated that 0.5 M NaOH, addition of 20% (v/v) c...

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