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Articles by J.M. Jahim
Total Records ( 3 ) for J.M. Jahim
  F.A. Abdul Mutalib and J.M. Jahim
  Thermo-responsive polymers, Dehypon®LS54 and Berol®370 were paired randomly with starch derivatives, K4484®dextrin and N-Lite®D maltodextrin for develop thermoseparating ATPS. The developed systems are DehyponLS54/K4484, DehyponLS54/N-Lite.D and Berol370/K4484. All systems were tested with partitioning of BSA as model protein. Among the tested systems, DehyponLS54/K4484 was found as most suitable system for BSA recovery. A small electrochemical potential effect was observed in DehyponLS54/K4484 dextrin system in which the change of pH (pH 8 to 6) had slightly influence the partitioning behavior of BSA. At both pH, BSA was observed had high affinity to starch enriched phase and it caused a low yield value of BSA after thermoseparation step. However, recovery of BSA in water phase at pH 6 was higher 40% compared to pH 8. The addition of Na2SO4 has lowered the cloud point of Dehypon®LS54.
  W.N.R.W. Isahak , M. Ismail , M.A. Yarmo , J.M. Jahim and J. Salimon
  Crude glycerol samples used in this study consisted of crude glycerol (CG1) produced from homogeneous catalyst (NaOH) obtained from Golden Hope biodiesel plant and crude glycerol (CG2) as a product of heterogeneous catalysed transesterification RBD palm oil using KOH/Al2O3 catalyst. KOH/Al2O3 catalyst was produced by wet impregnation method and characterized by using BET, XRD and SEM-EDX methods. 15% KOH/ Al2O3 has BET surface area of 26.1 m2 g-1 compared with 100.4 m2 g-1 for fresh Al2O3. The first purification stage of the crude glycerol was achieved by employing the neutralization method followed by microfiltration and ion exchange resins methods. Inorganic salts as a result of the neutralization with 85% v/v phosphoric acid were filtered using syringe filter 0.45 μm. Only glycerol peak could be detected using a Dionex C-18 column in the HPLC indicating that the neutralization step enabled the removal of excess homogeneous catalyst as well as the unreacted free fatty acids in the crude glycerol samples. The free ions from salt and catalyst were then eliminated through ion exchange process using Amberlite resins to produce higher glycerol purity. The samples were also analyzed using FTIR to check on their purity level and to detect any impurity that may still exist. The products of this 3-step purification method were deemed comparable to that of a commercial pure glycerol based on the viscosity, pH value, free fatty acid value, moisture content and density rendering them as competitive feedstock for the biolubricant production.
  W.M. Alalayah , M.S. Kalil , A.A.H. Kadhum , J.M. Jahim , S.Z.S. Jaapar and N.M. Alauj
  A two-stage fermentation process consisting of dark and photo-fermentation periods was carried out in a batch reactor. In the first stage, glucose was fermented in the dark stage using Clostridium saccharoperbutylacetonicum N1-4 (ATCC 13564; CSN1-4) to produce acetate, CO2 and H2. The acetate produced in the first stage is fermented to H2 and CO2 by Rhodobacter sphaeroides NCIMB 8253 for further hydrogen production in the second, illuminated stage. The yield of hydrogen in the first stage was about 3.10 mol H2 (mol glucose)-1 at a glucose concentration of 10 g L-1, pH 6±0.2 and 37°C and the second stage yield was about 1.10-1.25 mol H2 (mol acetic acid)-1 at pH 6.8±0.2 and 32°C, without removal of the Clostridium CSN1-4. The overall yield of hydrogen in the two-stage process, with glucose as the main substrate was higher than single-stage fermentation.
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