作者
Mona A Esawy, Eman F Ahmed, Wafaa A Helmy, Nahla M Mansour, Waled M El-Senousy, Mounir M El-Safty
发表日期
2011/8/15
期刊
Carbohydrate polymers
卷号
86
期号
2
页码范围
823-830
出版商
Elsevier
简介
Six Bacillus strains were isolated from different honey sources as levansucrase producers. The isolates were identified as Bacillus sp. based on both phenotypic and molecular identification using sequencing of 16S rRNA gene method. To distinguish them on species level other genes such as recA and ytcP genes have been employed. The molecular identification methods revealed that the six strains K, M, A, C, E, and G belong to unique Bacillus subtilis. Levan production by the isolates was dependent mainly on commercial sucrose media, the use of beet molasses glucose, lactose and fructose led to noticeable reduction in levan synthesis. Chemical hydrolysis of levan products showed that the polysaccharide consisted entirely of fructose. Levan produced by isolates K, M, A, C, E, and G had different molecular masses (40.938, 71.887, 43.487, 154.638, 77.753 and 14.200 kDa, respectively). The levan yield using …
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