UPSI Digital Repository (UDRep) : Guest Mode

Search Results

9 record(s) found

Gellan gum and pectin-functionalised magnetic graphene oxide nanocomposites as nanocarriers for permethrin to control mosquito larvae

Azlan Kamari

Abstract

In the present study, the efficacy of gellan gum-magnetic graphene oxide (GG-GO-Fe3O4) and pectin-magnetic graphene oxide (PEC-GO-Fe3O4) nanocomposites as nanocarriers for permethrin to control Aedes aegypti larvae was investigated for the first time. The physicochemical properties of the nanocomposites were studied using various scientific instruments. The ability of GG-GO-Fe3O4 and PEC-GO-Fe3O4 to load and release permethrin in vitro system was determined using an ultravioletvisible (UVVis) spectrometer. FTIR analysis has demonstrated the change in intensity and wavenumber of absorption bands, confirming the successful encapsulation of permethrin into the nanocarriers. Based on STEM analysis, the highest increment in size of nanocarriers (85%) was obtained after permethrin loading. The nanocarriers prolonged the release of permethrin up to 16h. The release profiles of permethrin from nanocarriers in rainwater were best fitted by Korsmeyer-Peppaskinetic model with correlation coeffici.....

Article Published 2023 456 hits Available

Physicochemical and morphological characterisation studies of fabrics treated with lavender essential oil-based nanoemulsion

Azlan Kamari

Abstract

Lavender essential oil is a concentrated plant extract obtained through steam distillation. It is well known for its properties as a good anxiety and stress reliever, for wound healing, for insect repellency and as an insomnia fighter. However, there are many volatile chemical compounds in the essential oil. Hence, formulating a lavender essential oil nanoemulsion is a potential solution to prolong those exclusive applications of the essential oil. Lavender essential oil-based nanoemulsion (LEONE) was prepared with tragacanth gum and Triton X-100 by a combined method of ultrasonic and high-speed homogenisation. This study focused on the physicochemical and morphological characterisation effects of fabrics treated with LEONE. Morphological and physicochemical evaluation of nanoemulsions were conducted by optical microscopy (OM), high resolution transmission electron microscopy (HR-TEM) and Fourier transform infrared (FTIR) spectroscopy. Ultraviolet-visible (UV-Vis) spectroscopy was util.....

Article Published 2024 390 hits Available

Lemongrass essential oil nanoemulsion formulations based on tragacanth gum and guar gum as durable anti-mosquito fabric finishing agents

Azlan Kamari

Abstract

Mosquito-repellent textiles are classified as protective textiles designed to mitigate the presence of mosquito species recognised as vectors for diseases such as malaria and dengue fever. This study aimed to explore the feasibility of employing a nanoemulsion system containing lemongrass essential oil encapsulated with biopolymers, specifically tragacanth gum and cationic guar gum, as finishing materials on cotton and polyester fabrics. Being anionic biopolymer, tragacanth gum has resulted in outstanding zeta potential, polydispersity index, particle size and encapsulation efficiency with the values of − 38.1 mV, 0.2, 14.1 nm and 99%, respectively. The positively charged guar gum that interacted with aluminium chloride led to precipitation, which disfavoured retention and repellency properties. Based on correlation coefficient (R2) values for tragacanth gum (0.9832) and cationic guar gum (0.9761)-based nanoemulsions, the release of lemongrass essential oil from nanoemulsions follo.....

Article Published 2024 316 hits Available

Formulation of nanoemulsions from cerbera odollam seeds essential oil and their larvicidal activities against aedes aegypti larvae

Azlan Kamari

Abstract

As of September 2024, there are 322,274 and 94,807 cases due to dengue in Indonesia and Malaysia, respectively. Prompt actions must be taken to control mosquito population and mosquito-borne diseases proliferation. Larvicidal control is one of the effective strategies that are promoted by World Health Organization (WHO). Bintaro (Cerbera odollam) are highly available in wetlands, but they are extremely toxic, especially their seed kernels. In this study, the active compounds of C. odollam seed kernels were gradually extracted using Soxhlet extraction with n-hexane, chloroform and ethanol and were further distilled with a rotary evaporator. Nanoemulsions were formulated with Arabic gum and Triton X-100 by using both homogenisations of high-speed and ultrasonic. Gas chromatography-mass spectrometry (GC-MS), Fourier transform infrared (FTIR) spectroscopy and scanning transmission electron microscopy (STEM) were used to characterise oils and nanoemulsions. Encapsulation efficiencies of nan.....

Article Published 2024 369 hits Available

Impregnation process and kinetics studies of MgO nanocatalyst/montmorilonite-K10 for biodiesel production from Cerbera odollam oil in modified-microwave reactor

Azlan Kamari

Abstract

Impregnation of MgO nanocatalysts on montmorillonite-K10 (MTe) and kinetics studies on transesterification reactions for biodiesel production using Cerbera odollam oil have been conducted. The impregnation process of nanocatalyst into MTe was carried out by mixing the MgO nanocatalyst with MTe dispersed in an ethanol solution. The MgO-MTe product was characterized using X-ray diffraction (XRD), Fourier transform infrared (FT-IR), and scanning electron microscopy (SEM). Transesterification reaction process of Cerbera odollam oil using MgO-MTe catalyst carried out in batch modified-microwave reactor with various oil/methanol ratios, reaction temperatures, reaction time, and the percentage weight of catalyst. Furthermore, the reaction kinetics analysis is done using the pseudo-first-order reaction. The quality of biodiesel was determined using the American society for testing and materials (ASTM) method for biodiesel test. The results show that with the increasing percentage weight of cat.....

Article Published 2024 279 hits Available

Enhancing critical thinking skills through stem problem-based contextual learning: An integrated e-module education website with virtual experiments

Azlan Kamari

Abstract

One of the skills needed in the 21st century is critical thinking skills that need to be developed for secondary school students. Currently, upper-secondary students’ critical thinking skills are still low. To overcome the problem, website-based E-module learning media was developed using a STEM approach with a Problem-Based Contextual Learning model with virtual experiments using PhET. The aim of developing this website-based E-Module media is to improve students’ thinking skills on thermochemistry learning materials. The development model is 4-D. Data collection in this study was gained from three schools representing schools in the high, medium, and low categories in Surakarta, Indonesia. In this research,216 students were involved as the subjects at the development module implementation stage. The results of expert validation of the material, language, and media modules are suitable for use with a score of 90.03% categorized as very good. In the feasibility test, the score was .....

Article Published 2024 269 hits Available

Thermal conversion of coral waste and its utilization as low-cost catalyst for biodiesel production

Azlan Kamari

Abstract

This study investigates the thermal conversion of waste coral and its utilization as a heterogeneous catalyst for biodiesel production from soybean oil. In this work, waste coral is calcined at varied temperatures of 800, 900, and 1000°C, and the effect of the calcination temperature on the physicochemical character of the solid is evaluated through Fourier-transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy, and basicity measurement. The results show that the higher temperature facilitates the conversion of CaCO3 of the aragonite and calcite phases in raw waste coral into CaO, achieving a complete conversion at the temperature of 1000°C. Thermal conversion influences the increased surface basicity of the solid, which is associated with the higher activity for biodiesel production. Further studies on the obtained CaO as a catalyst demonstrate the catalyst dosage and the methanol-to-oil ratio as significant factors for fatty acid methyl ester production. T.....

Article Published 2024 223 hits Available

Recyclable and reusable catalyst of chitosan-modified mgal-layered double hydroxide for biodiesel production

Azlan Kamari

Abstract

Study of chitosan modification to MgAl-LDH to increase surface basicity for improving biodiesel production from palm oil has been performed. Modification was conducted by chitosan gel impregnation onto prepared MgAl-LDH. Furthermore, the physicochemical character of material was evaluated by X-ray diffraction (XRD), scanning electron microscope, transmission electron microscope, gas sorption analysis, and determination of solid basicity. The XRD, specific surface area, pore distribution, and TEM analyses confirmed the reduced specific surface area due to the exfoliated LDH conformation. However, the increased surface basicity aroused from the modification leads to improved catalytic activity and yield. The maximum biodiesel yield of 92.8 % was achieved by the methanol to oil ratio of 10:1 at 90 °C for 2 h. The prominent reusability until the 5th cycle of usage without significant activity change is a potency for advocating the suitability of the low-cost catalysis technology for comme.....

Article Published 2024 236 hits Available

Preparation and characterization of zinc crosslinked chitosan membrane as an effective adsorption material for amoxicillin in pharmaceutical wastewater

Azlan Kamari

Abstract

This study aims to synthesize a zinc crosslinked chitosan (Chi/Zn) membrane as an adsorbent for amoxicillin in pharmaceutical wastewater. The Chi/Zn membranes were prepared over 14 hours at 50 °C with varying chitosan and zinc concentrations. FTIR analysis confirmed successful crosslinking by identifying hydroxyl (O-H), carbonyl (C-O), and amine groups (NH2), along with N-Zn and O-Zn interactions. XRD analysis indicated an amorphous structure, while SEM revealed rough, uneven surfaces. The highest adsorption capacity of a chitosan membrane occurs at a concentration of 60 mg/L. At this concentration, the pure chitosan membrane's adsorption effectiveness and capacity are 42.2% and 42.2 mg/L, respectively. The Chi/Zn membrane adsorbed amoxicillin with an adsorption efficiency of 58.86% with an adsorption capacity of 58.86 mg/g. Thus, it can be said that the chitosan/Zn membrane is quite effective in being applied as an amoxicillin adsorbent in pharmaceutical waste. © 2024, Rasayan Journ.....

Article Published 2024 273 hits Available

Search Results

Filter

Specific Period

Recently Accessed