Abstract:
The isolation of bacterial that have ability to produce cellulose gel was done. Out of 108 isolates, the isolates of G9, G11, G16, R9 and R9/2 were found to produce cellulose gel under high temperature. These 5 isolates were subjected to study the biochemical characteristics and analysed for 16s rDNA sequences. They were identifiled to be Acetobacter xylinum. The isolate G9 was found to be able to produce high amount of cellulose under 37-42 ํC. It was chosen to study for the effect of various chemicals on the production of cellulose by the addition of chemicals to coconut medium, which contained total sugar 3.07%(w/v) at 0,2,5 and 8%(w/v) of sucrose: lactate at 0,0.1,0.15 and 0.20%(v/v) and methionine at 0, 0.0025, 0.005 and 0.0075 %(w/v). It was found that the addition of sucrose at 5%(w/v) produced the thickness pellicle of 14.91 7.12 and 5.79 millimeters, cellulose production 3.54 2.47 and 1.05 gram/litres at 37 40 and 42 ํC,respectively. The addition of lactate at 0.15%(v/v) to the medium showed the thickness pellicle at 15.03 millimeters and cellulose production 3.68 gram/litres at 37ํC and addition of lactate at 0.20%(v/v) showed the thickness pellicle at 7.55 and 4.12 millimeters and cellulose production 3.49 and 2.25 gram/litres at 40 and 42 ํC,respectively. The addition of methionine at 0.0075%(w/v) in the medium produced the thicknest pellicle of 14.78 millimeters and cellulose production 3.75 gram/litres at 37 ํC and the concentration of 0.0025%(w/v) produced the thickness pellicle of 4.16 and 3.85 millimeters and cellulose production 2.055 and 1.25 gram/litres at 40 and 42 ํC,respectively. The combination of these there effects were also studied. The isolate G9 was cultured in the coconut medium with the addition of 5%(w/v) sucrose, 0.20%(v/v) lactate and 0.0075%(w/v) methionine under 42 ํC. The isolate produced cellulose pellicle with the thickness of 15.55 8.56 and 4.57 millimeters and cellulose production 4.15 3.51 and 2.54 gram/litres at 37,40 and 42 ํC,respectively. When cultured G9 on the medium contain tea leave extraction under high temperature. It was found to be able to produce higher amount of cellulose than cultured in coconut medium,the extraction of tea leaves was fractionated by gel filtration chromatography. There were 95 fractions collected. It was found that the fraction number 40,42,45,46,53,54,55 and 56 induced the production of cellulose gel in the basal medium, while the fraction 53 showed the highest production. The composition of this fraction was found to be compound of 0.019, 0.134 and 0.308 mg/l of protein, total sugar and phenolic as gallic acid,respectively