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Levans produced from Microbacterium laevaniformanswere isolated, characterized, and fractionated by molecularweight. TLC, HPLC, and GC-MS analyses of the exopolysaccharideshowed that it was a fructan-type polymer andwas composed of (2,6)- and (2,1)-glycosidic linkages. 13CNMRanalysis proved that the polysaccharide was mainly aβ-(2,6)-linked levan-type polysaccharide. To investigate thecytotoxicity of the acetone-precipitated levan fractions suchas M1, M2, and M3, HepG2, P388D1, U937, SNU-1, andSNUC2A cell lines were screened. Among the cell linestested, the cytotoxicity of M1-M3 fractions were detectedfrom only SNU-1 and HepG2 cells at the dosage level of100- 800 μg/ml. The M2 fraction (Mr 80,000) at 400 μg/mlhad the greatest cell growth inhibition (84.6%) on SNU-1,while the M1 (Mr 50,000) at 800 μg/ml showed the greatest(46.32%) on HepG2. To obtain more uniform Mr fractionsof levan, the levan was further fractionated from S1(Mr 1,000,000) to S5 (Mr 10,000) using gel permeationchromatography. Again, the S1-S5 fractions had strongcytotoxicity on SNU-1 and HepG2 cell lines. The greatestinhibition effects of S4 (Mr 80,000) on SNU-1 and S5(Mr 10,000) on HepG2 were shown to be 49.5% and 73.0%,respectively. The cytotoxicity of the levan fractions was moreeffective on SNU-1 than on HepG2. Although the relationshipbetween the Mw and the cytotoxicity was not clear, smallerMr fractions of levan showed greater growth inhibition effecton the cancer cell lines in general. Therefore, it was indicatedthat a specific Mw class of levan is responsible for theeffective cytotoxicity.

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