Nur Izzati Iberahim
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Nur Izzati Iberahim
Official Name
Nur Izzati, Iberahim
Alternative Name
Berahim, Nurizzati
Iberahim, N. I.
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Scopus Author ID
57200276640

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  • Publication
    Extraction of omega-3 fatty acid from Jade Perch (Scortum barcoo) using enzymatic hydrolysis technique
    (Chemistry Department, Universitas Gadjah Mada, 2020)
    Nur Izzati Iberahim
    ;
    Yee Chee Hann
    ;
    Zainab Hamzah
    ;
    Khairunissa Syairah Ahmad Sohaimi
    Extraction of omega-3 fatty acid from Jade Perch (Scortum barcoo) using enzymatic hydrolysis techniques are expected to be more economically possible techniques due to the uses of the enzyme with the characteristic of environmentally friendly, reusable and less energy required during large-scale production. Design of Experiments (DOE) was used to study the effect of process parameters such as the concentration of alcalase (0.5–1.5%), temperature (50–70 °C) and pH (6.5–8.5) towards the yield of oil. The findings showed 16.55% of oil yield was extracted from the jade perch under an optimum condition at 50 °C, 6.5 pH with 0.5% of enzyme concentration for 2 h incubation time. The fish oil was then undergone enzymatic concentration of omega-3 FA using lipase from Candida rugosa. The acid value and peroxide value of the fish oil was 71.422 mg KOH/g and 0.799 meq/kg, while the acid and peroxide value of the omega-3 concentrated oil was lower to 49.074 mg KOH/g and 0.399 meq/kg. The FTIR spectrum showed the presence of C–H stretch, =C–H stretch and C=O stretch bond justified the existence of lipids as it presents of alkanes, alkene, and carboxylic acids functional group. At the same time, GC-MS analysis showed the fish oil contains higher total PUFA content and omega-3 fatty acid content than omega-3 concentrated oil.
      1  2
  • Publication
    Ammonium adsorption - Desorption using rice husk biochar
    ( 2021-05-24)
    Khairunissa Syairah Ahmad Sohaimi
    ;
    Nur Izzati Iberahim
    ;
    Ghani A.A.
    ;
    Zafifah Zamrud
    ;
    Heng C.W.
    Rice husk was utilized into biochar by pyrolysis and used as adsorbent for ammonium removal. Rice husk biochar (RHB) was produced at temperature of 3500C, 4000C, 4500C, 5000C, and 5500C. Characteristics of biochar were analyzed by moisture content, ash content, pH Zero Charge and Fourier Transform Infrared (FTIR) Spectroscopy. As the temperature for the pyrolysis increases, the moisture content of RHB decreases while the ash content of RHB increases. From the pH zero charge analysis, the value obtained from analysis is pH 7. The FTIR spectra showed the organic part of RHB with different functional groups such as alkene, alcohol, phenol, ether, ester etc. Based on the result of the characterization test, RHB500 was chosen as the best biochar for the adsorption of ammonium. The equilibrium contact time was 180 minutes and the optimum adsorbent dosage was 0.1g and the optimum concentration of ammonium was 1.2 ppm. For the adsorption-desorption of ammonium, RHB can run up to 5 cycles for biochar regeneration. Adsorption kinetic, pseudo-second-order model is more preferable than pseudo-first-order model because R2 value is 0.9995 which closer to 1.
      33  1