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Potential of extraction of Steviol glycosides using cellulose acetate phthalate (CAP) – polyacrylonitrile (PAN) blend hollow fiber membranes

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Abstract

Cellulose acetate phthalate (CAP) – Polyacrylonitrile (PAN) blend hollow fibers were spun in the present work and their efficacy in extraction of Steviol glycosides was investigated. Various compositions of blend hollow fibers were characterized in terms of scanning electron microscopy (SEM), permeability, contact angle, pore size distribution and breaking stress. Concentration of CAP was varied up to 5 wt.% in a total polymer concentration of 20 wt.%. It was observed from SEM images that finger like pores in the cross-section became tear drop like with decrease in concentration of CAP, making them denser. Pure PAN membrane showed the highest permeability around 238 l/m2.h.bar and the lowest molecular weight cut off (MWCO) 12 kDa and the highest pore density 2.8 × 1018 m−2. CAP-PAN (4:16) blend membrane of MWCO 30 kDa was found to be the most suitable for extraction of Steviol glycosides. At 34 kPa transmembrane pressure drop (TMP) and cross flow rate (CFR) 10 l/h, glycoside recovery was 55 % and purity was 30 % under total recycle mode of operation. Steady state permeate flux was 8 l/m2.h at 102 kPa TMP. A three stage diafiltration was carried out at 34 kPa TMP and 5 l/h flow. Enhanced 94 % recovery and 54 % purity of the Steviol glycosides was obtained under these conditions.

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Acknowledgments

This work is partially supported by a grant from the Board of Research in Nuclear Sciences, Department of Atomic Energy, Government of India, Mumbai, under the scheme no. 2012/21/03-BRNS, Dt. 25-07-2012 and SRIC, IIT Kharagpur under scheme no. IIT/SRIC/CHE/SMU/2014-15/40, dated 17-04-2014. Any opinions, findings and conclusions expressed in this paper are those of the authors and do not necessarily reflect the views of BRNS. The authors acknowledge help of Mrinmoy, Sankha and Somak.

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Authors and Affiliations

  1. Department of Chemical Engineering, Indian Institute of Technology, Kharagpur, 721302, India

    Anirban Roy & Sirshendu De

  2. Membrane Separations Group, Chemical Engineering Division, Indian Institute of Chemical Technology (CSIR-IICT), Hyderabad, 500 007, India

    Siddhartha Moulik & Sundergopal Sridhar

Authors
  1. Anirban Roy
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  2. Siddhartha Moulik
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  3. Sundergopal Sridhar
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  4. Sirshendu De
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Correspondence to Sirshendu De.

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Fig. S1

Permeate flux profile for CAP: PAN 15:5 membrane at different flow rates (DOC 177 kb)

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Roy, A., Moulik, S., Sridhar, S. et al. Potential of extraction of Steviol glycosides using cellulose acetate phthalate (CAP) – polyacrylonitrile (PAN) blend hollow fiber membranes. J Food Sci Technol 52, 7081–7091 (2015). https://doi.org/10.1007/s13197-015-1865-5

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  • DOI: https://doi.org/10.1007/s13197-015-1865-5

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