Abstract
Mannitol is a naturally occurring low calorie sweetener, widely used in the food, pharmaceutical, medicine and chemical industries. In this study mannitol producing strains of Leuconostoc spp. (210) were isolated from a wide array of sources such as raw milk, fermented milks, fermented cereal foods, fruits, vegetables and sugar factory syrup. During initial screening, half of the population of these isolates (105) exhibited ability to produce mannitol to a variable extent. Only 11.4% isolate produced mannitol yield of above 80% (when fructose used @ 50 g/l). Cultural and environmental factors affecting growth and mannitol production were studied for four high mannitol producing isolates. High mannitol production was favored by high temperature and high pH. Isolates had high osmotic tolerance as these could use fructose concentration as high as 100 g/l in batch culture. Sequencing of 16S rRNA genes of the strains revealed that Ln27, Ln104 and Ln206 were Leuconostoc mesenteroides and Ln92 was Leuconostoc fallax.
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Acknowledgments
We express our gratitude to the Director General, Indian Council of Agricultural Research (ICAR) and Director, National Dairy Research Institute (NDRI) Karnal, for providing financial assistance and necessary facilities to carry out this study.
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Patra, F., Tomar, S.K., Rajput, Y.S. et al. Characterization of mannitol producing strains of Leuconostoc species. World J Microbiol Biotechnol 27, 933–939 (2011). https://doi.org/10.1007/s11274-010-0536-y
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DOI: https://doi.org/10.1007/s11274-010-0536-y