Zarina Zakaria
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Preferred name
Zarina Zakaria
Official Name
Zarina, Zakaria
Alternative Name
Zakaria, Zarina
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Researcher ID
36459339400

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  • Publication
    Effect of photodegradation on chemical characteristics and enzymatic digestibility of chicken feather keratin
    ( 2024-03-21)
    Aziz F.
    ;
    Zarina Zakaria
    ;
    Syazwani Mahmad Puzi
    ;
    Huzairy Hassan
    The rapid development of poultry industry has correlated with increased production of keratin containing wastes that possessed complex morphology which difficult to degrade. UV irradiation pretreatment provide an initial stage of degradation before they are further degrade using fermentation process into ready to use protein. Untreated and treated with UV light chicken feathers morphology of fibers and cuticle cells were observed using SEM. A feather protein hydrolysate was produced by keratinolytic bacteria Bacillus subtilis under submerged fermentation. Keratinolytic kinetic is study using Michealis-Menten kinetics where Km value for treated chicken feathers with UV was 22.4591 M which is smaller compare to untreated chicken feathers, 42.3065 M. The smaller Km value shows tightly binding of keratinase and chicken feathers powder. Chicken feathers that were treated with UVC has the highest protein content about 3.19 mg/mL of protein while untreated chicken feathers only contains 2.29 mg/mL of protein.
      1
  • Publication
    The Optimization of Protease Enzyme Extraction from Streblus Asper (Kesinai)
    ( 2020-12-18)
    Seow Yen Yi
    ;
    Rozaini Abdullah
    ;
    Lee Yen Fong
    ;
    Zarina Zakaria
    ;
    Huzairy Hassan
    ;
    Sharifah Zati Hanani Syed Zuber
    ;
    Mohd Ruslan, Mahfuz Affif
    Protease from Streblus asper (Kesinai) is an interesting rennet substitute and yet very few studies had been conducted so far. In the present study, the leaf extract of Kesinai had been discovered to investigate the ability of this milk coagulating enzyme. The development of the optimized conditions for enzyme extraction was analyzed by using Central Composite Design (CCD). The studied factors were ratio of sample to buffer, weight of sample (g) and homogenization time (min). It was found that a 30 g of S. asper leaves sample with the ratio of the sample to buffer of 1:1 and at a mixing rate of 2 minutes established the most desirable conditions for serine proteases extraction from the S. asper leaves sample.
      5  8