Noor Amirah Abdul Halim
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Preferred name
Noor Amirah Abdul Halim
Official Name
Noor Amirah , Abdul Halim
Alternative Name
Halim, Noor Amirah Abdul
Abdul Halim, N. A.
Halim, Noor A.A.
Main Affiliation
Scopus Author ID
57194716535
Researcher ID
JAA-5824-2023

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  • Publication
    Screening of factors influencing the yield of Citrus hystrix leaves essential oil extracted via pressurized hot water extraction based on resolution V fractional factorial design
    (Wiley, 2020)
    Noor Amirah Abdul Halim
    ;
    Zurina Z. Abidin
    ;
    Shamsul I. Siajam
    ;
    Chong G. Hean
    ;
    Mohd R. Harun
    Pressurized hot water extraction (PHWE) could be a better alternative in enhancing the yield of valuable Citrus hystrix leaves essential oil. Thus, the fractional factorial design based on resolution V was used to assess the crucial factors that affect the essential oil yield (%Y) extracted from Citrus hystrix leaves through a PHWE. A maximum Y% of 1.63% was successfully isolated at conditions involving 0.08% moisture content, 1 mm particle size, 1:0.2 ml/g solvent-to-sample ratio, 30 min extraction time, and 120°C extraction temperature. Moisture content and particle size were the main effects that significantly affect the %Y, while the extraction time and solvent-to-sample ratio exhibited a moderate effect on %Y, followed by extraction temperature that showed the least effect on %Y. A developed regression model has shown good correlation and adequacy on %Y. Based on the compositional analysis, neoisopulegol hydrate appears to be the main constituents of the oil obtained. Practical applications: C. hystrix leaves could be a promising alternative commodity to citrus peels in fulfilling the increasing market demand for the natural citrus essential oils. However, the conventional essential oil extraction technique such as hydrodistillation is generally time and energy-consuming and yields low production. Thus, an innovative technology involving a pressurized hot water extraction technique was employed to improve the efficiency of the extraction. A fractional factorial design approach was used to assist the optimization process with consideration on more factors with reduced experimental trials that can economically identify the significance of factors influencing the yield of essential oil. The use of resolution V design has enhanced the accuracy of the statistical analysis since the individual effects and the interaction effects of the factors studied were not aliased.
  • Publication
    Kinetic and Isotherm Studies of Malachite Green Adsorption From Aqueous Solution by Calcined Eggshell Treated Orange Peel
    ( 2023-06-09)
    Chun H.K.
    ;
    Sharifah Zati Hanani Syed Zuber
    ;
    Nor Fauziah Zainudin
    ;
    Noor Amirah Abdul Halim
    ;
    Rozaini Abdullah
    ;
    Mohd Qalani Che Kasim
    In this work, the ability of eggshell treated orange peel as a low-cost adsorbent to remove malachite green (MG) dye from an aqueous solution was investigated. The eggshell treated orange peel was characterized by using Fourier transform infrared (FTIR) spectroscopy analysis. From the FTIR analysis, the functional group that might be involved in the adsorption process was found to be carboxylic acid and alcohol. The effect of contact time, initial dye concentration and adsorbent dosage were also investigated by using batch adsorption mode. The results showed that the percentage of dye removal increased with the increase of contact time and the process attained equilibrium within 140 minutes with the highest percentage of MG dye removal was 98%. The percentage of dye removal was also found to increase with the increase of initial dye concentration and adsorbent dosage. The experimental result showed that 0.1 g eggshell treated orange peel was able to remove 98% of MG dye while about 99% of MG dye was removed for 250 mg/L of dye concentration. The adsorption isotherm data were well fitted to the Langmuir isotherm model with the qmax of 31.45 mg g-1. Meanwhile, the kinetic data was best presented by the pseudo-second-order model with R2> 0.99.
      26  1
  • Publication
    Synergistic effect of probe sonication and ionic liquid for extraction of phenolic acids from oak galls
    (Elsevier, 2020)
    N.F. Sukor
    ;
    R. Jusoh
    ;
    N.S. Kamarudin
    ;
    Noor Amirah Abdul Halim
    ;
    A.Z. Sulaiman
    ;
    S.B. Abdullah
      10  1