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Bioflocculant Exopolysaccharide Production by Azotobacter indicus Using Flower Extract of Madhuca latifolia L

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Abstract

Efficacy of Azotobacter indicus ATCC 9540 strain for production exopolysaccharide (EPS) bioflocculant was investigated. Mahua flower extract (Madhuca latifolia L), a natural substrate at the concentration of 20 g L−1, gave maximum recovery of EPS followed by sucrose and mannitol as compared to other carbon sources after 172 h. Yeast extract was found to be the most effective nitrogen source as compared to beef extract, sodium nitrate, ammonium sulfate, casein hydrolysate, and urea for the production of EPS. EPS production was increased in presence of nitrogen (5.51 g L−1) as compared to nitrogen-free medium (3.51 g L−1), and fermentation time was also reduced by 28 h. Maximum EPS production (6.10 g L−1) was found in the presence of 20 g L−1 flower extract and 0.5 g L−1 yeast extract containing Ashby’s media with 180 rpm at 30 °C at 144 h, under controlled conditions in 2.5 L fermenter using optimized medium. The isolated EPS showed cation-dependent flocculating activity. Concentration of EPS played an important role in bioflocculating activity which increased in a concentration-dependent manner up to a certain limit, with the maximum flocculation of 72% at 500 mg L−1 concentration but remained almost static after this concentration. Extracted polymer was characterized by different chemical tests, FT-IR spectroscopy, and TLC which showed presence of uronic acids, O-acetyl groups, and Orcinol with suggestive indication of alginate like polymer. This study suggests that use of M. latifolia L. flowers can be a potential alternative bioresource for production of exopolysaccharide.

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Acknowledgement

Financial assistance from University Grants Commission (UGC) and Department of Science & Technology (DST), New Delhi, in the form of project grant SVP is gratefully acknowledged.

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  1. School of Life Sciences, North Maharashtra University, Post Box 80, Jalgaon, 425001, Maharashtra, India

    Satish V. Patil, Rahul B. Salunkhe, Chandrashekhar D. Patil, Deepak M. Patil & Bipinchandra K. Salunke

  2. Molecular Biology Unit, National Centre for Cell Science, Lab #3, Ganeshkhind, Pune, 411 007, MS, India

    Bipinchandra K. Salunke

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  1. Satish V. Patil
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Patil, S.V., Salunkhe, R.B., Patil, C.D. et al. Bioflocculant Exopolysaccharide Production by Azotobacter indicus Using Flower Extract of Madhuca latifolia L. Appl Biochem Biotechnol 162, 1095–1108 (2010). https://doi.org/10.1007/s12010-009-8820-8

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