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Articles by Ibrahim Che Omar
Total Records ( 2 ) for Ibrahim Che Omar
  Leong Sue Yie and Ibrahim Che Omar
  Optimization of the solid state fermentation on PKC for benzyldehyde production by a locally isolated fungus, which was identified to be Penicillium diversum revealed that at the temperature of 30̊C, particle size of PKC of 1 mm, water content of 40%, glucose to ammonium sulphate supplementation ratio of 1:1 and inoculum size of 105 spores g–1 PKC, benzyldehyde production of 7.2 mg g–1 PKC was obtained after 5 days fermentation. This is an increase by more than 80% compared to before optimization, The production does not depend on the growth of the fungus.
  Sharul Bariyah Shahul Hamid and Ibrahim Che Omar
  Optimization of the co-immobilized cholesterol esterase and cholesterol oxidase preparations on to cellulose acetate membrane by absorption was performed. A maximum absorption of 75% for cholesterol oxidase and 63% for cholesterol esterase was obtained under the conditions consisting of agitation rate of 70 oscillations per min for 18 h using 0.06 U cm–2 of cholesterol esterase and 0.08 U cm–2 of cholesterol oxidase at 37oC and pH 7.4. The enzyme activities and stabilities were improved when treated with 1.5% of glutaraldehyde. A significant and satisfactory stability of 8 repeated uses of the co-immobilized preparations was obtained with a t½ of 15 consecutives uses. When compared to the commercially available Sera-Pak® (Bayer corporation) and CHOD-PAP (Chema diagnostica), the co-immobilized enzymes preparation showed a significant correlation with an r value of 0.95 and 0.99, respectively.
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