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Articles by Noraini Samat
Total Records ( 4 ) for Noraini Samat
  Suraini Abd-Aziz , Gan Siew Hung , Mohd Ali Hassan , Mohamed Ismail Abdul Karim and Noraini Samat
  Solid-State Fermentation (SSF) of Aspergillus niger FTCC 5003 on Palm Kernel Cake (PKC) is a practical approach to upgrade PKC into value added product. Present study was conducted on Aspergillus niger FTCC 5003 growth profile and models that are able to describe the growth in SSF using PKC substrate. Due to the difficulties of separating cell biomass quantitatively from the substrate for SSF systems, indirect method for measurement of cell growth during SSF of PKC by Aspergillus niger FTCC 5003 was studied based on the estimation of glucosamine and protein content. Preliminary relationships between glucosamine and protein contents to fungal dry cell weight (Dw) were developed using simulated homogenous SSF data using glass beads as support materials. Both glucosamine and protein contents were well correlated to the fungal dry cell weight in SSF on support materials for protein and glucosamine, respectively. The equations obtained were used for the estimation of cell biomass profile during SSF of PKC from the data of glucosamine and protein as growth indicator study. The estimated fungal dry cell weight based on protein concentration and β-mannanase activity as metabolic activity for microbial growth were well correlated to PKC dry weight which, indicating that both were suitable marker in describing the growth of A. niger FTCC 5003 in this system. In contrast, estimated fungal dry cell weight based on glucosamine concentration was not suitable to describe the growth of A. niger FTCC 5003.
  Jahwarhar Izuan Abdul Rashid , Noraini Samat and Wan Mohtar Wan Yusoff
  Optimization of three parameters, temperature (25-35°C), moisture content (40% (w/v)-60% (w/v) and inoculum sizes (5% (w/v)-15% (w/v) were investigated and optimized by Response Surface Methodology (RSM) for optimal mannanase production by Aspergillus terreus SUK-1. A second order polynomial equation was fitted and the optimum condition was established. The result showed that the moisture content was a critical factor in terms of its effect on mannanase. The optimum condition for mannanase production was predicted at 42.86% (w/v) initial moisture (31°C) temperature and 5.5% (w/v) inoculum size . The predicted optimal parameter were tested in the laboratory and the mannanase activity 45.12 IU mL-1 were recorded to be closed to the predicted value (44.80 IU mL-1). Under the optimized SSF condition (31°C, 42.86% moisture content (w/v) and 5.5% inoculum size (w/v)), the maximum mannanase production was to prevail about 45.12 IU mL-1 compare to before optimized (30°C, 50% moisture content (w/v) and 10% inoculum size (w/v)) was only 34.42 IU mL-1.
  Jahwarhar Izuan Abd Rashid , Noraini Samat and Wan Mohtar Wan Yusoff
  Microbial mannanases have become biotechnologically important in industry but their application is limited due to high production cost. In presents study, the extraction of mannanase from fermented Palm Kernel Cake (PKC) in the Solid State Fermentation (SSF) was optimized. Local isolate of Aspergillus terreus SUK-1 was grown on PKC in (SSF) using column bioreactor. The optimum condition were achieved after two washes of fermented PKC by adding of 10% glycerol (v/v) soaked for 10 h at the room temperature with solvent to ratio, 1:5 (w/v).
  Jahwarhar Izuan Abd Rashid , Noraini Samat and Wan Mohtar Wan Yusoff
  In this study, two statistical experimental methods including Plackett Burman design and Response Surface Methodology (RSM) were employed to optimize the medium composition for mannanase production by Aspergillus terreus SUK-1, a locally isolated fungus using Palm Kernel Cake (PKC) as the sole carbon source. A total of 19 media were screened in order to determine the optimum media for mannanase production using Plackett-Burman design. Soya bean, proteose peptone, urea and NH4NO3 were identified as the supplement to give positive effect on mannanase production by A. terreus SUK-1. Proteose peptone was more significant in terms of its effect on mannanase production compared to urea. The optimum of the medium composition was predicted when the concentrations of proteose peptone and urea were set at 0.5 and 1% (g g-1), respectively. The optimum mannanase activity was closed to the predicted value 30.24±1.32-32.60 IU g-1 when the optimum medium composition was employed. Under the optimized medium (0.5% (g g-1) of proteose peptone and 1% (g g-1) of urea), Mannanase production was 3-fold higher than the activity obtained under original medium (9.97±1.34 IU g-1).
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