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dc.contributor.authorSiti Aqlima, Ahmad,-
dc.contributor.authorNoorliza, Mat Arif,-
dc.contributor.authorGan Bee, Koon,-
dc.contributor.authorMohd Yunus, Abdul Shukor,-
dc.contributor.authorMohd Arif, Syed,-
dc.contributor.authorNor Aripin, Shamaan,-
dc.description.abstractA locally isolated Acinetobacter sp. Strain AQ5NOL 1 was encapsulated in gellan gum and its ability to degrade phenol was compared with the free cells. Optimal phenol degradation was achieved at gellan gum concentration of 0.75% (w/v), bead size of 3 mm diameter (estimated surface area of 28.26 mm(2)) and bead number of 300 per 100 ml medium. At phenol concentration of 100 mg l(-1), both free and immobilized bacteria exhibited similar rates of phenol degradation but at higher phenol concentrations, the immobilized bacteria exhibited a higher rate of degradation of phenol. The immobilized cells completely degrade phenol within 108, 216 and 240 h at 1,100, 1,500 and 1,900 mg l(-1) phenol, respectively, whereas free cells took 240 h to completely degrade phenol at 1,100 mg l(-1). However, the free cells were unable to completely degrade phenol at higher concentrations. Overall, the rates of phenol degradation by both immobilized and free bacteria decreased gradually as the phenol concentration was increased. The immobilized cells showed no loss in phenol degrading activity after being used repeatedly for 45 cycles of 18 h cycle. However, phenol degrading activity of the immobilized bacteria experienced 10 and 38% losses after the 46 and 47th cycles, respectively. The study has shown an increased efficiency of phenol degradation when the cells are encapsulated in gellan gum.en_US
dc.subjectGellan Gumen_US
dc.subjectImmobilized Cellen_US
dc.subjectPhenol Degradationen_US
dc.subjectAcinetobacter Spen_US
dc.titleEnhanced phenol degradation by immobilized Acinetobacter sp strain AQ5NOL 1en_US
Appears in Collections:World Journal Of Microbiology & Biotechnology

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