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Optimization of spray-drying process conditions for the production of maximally viable microencapsulated L. acidophilus NCIMB 701748

Behboudi-Jobbehdar, Solmaz; Soukoulis, Christos; Yonekura, Lina; Fisk, Ian D.

Authors

Solmaz Behboudi-Jobbehdar

Christos Soukoulis

Lina Yonekura



Abstract

Inrecent years, the use of spray drying for the production of anhydrobiotics has gained the interest of functional food manufacturers, mainly due to cost efficiencies and enhanced product and process flexibility (e.g., enhanced shelf life). In the present work, spray-drying conditions (air inlet temperature and feed flow rate) were optimized for the microencapsulation of the thermo sensitive probiotic lactobacilli strains Lactobacillus acidophilus stabilized in a 60:20:20 (w/w) maltodextrin: whey protein concentrate: D-glucose carrier. A 23 full-factorial experimental design was constructed with air inlet temperature (120, 140, and 160°C) and feed flow rate (6, 7.5, and 9.0 mL/min) as the independent variables and total viable counts (TVC), water activity (a w ), and cyclone recovery (CR) defined as the dependent variables. The increase in air inlet temperature from 120 to 160°C induced a significant (p < 0.001) reduction in the TVC from 9.02 to 7.20 log cfu/g, which corresponds to a97.5% loss of the L. acidophilus viable counts. On the other hand, the increase in the feed flow rate from 6 to 7.5 mL/min significantly reduced (p < 0.001) the heat-induced viability loss. A further increase in the feeding rate did not further modify the achieved thermo protection, and a detrimental impact of cyclone recovery (reduction) and water activity (increase) of the powder was observed. Using pruned quadratic mathematical models, the optimum spray-drying conditions for the production of maximally viable microencapsulated L. acidophilus were 133.34°C and 7.14 mL/min. The physicochemical and structural characteristics of the powders produced were acceptable for application with regards to residual water content, particles mean size, and thermo physical properties to ensure appropriate storage stability under room temperature conditions, with a low inactivation rate of L. acidophilus. Microcapsules appeared partially collapsed by scanning electron microscope with a spherical shape with surface concavities.

Citation

Behboudi-Jobbehdar, S., Soukoulis, C., Yonekura, L., & Fisk, I. D. (2013). Optimization of spray-drying process conditions for the production of maximally viable microencapsulated L. acidophilus NCIMB 701748. Drying Technology, 31(11), doi:10.1080/07373937.2013.788509

Journal Article Type Article
Publication Date Aug 25, 2013
Deposit Date Apr 7, 2014
Publicly Available Date Apr 7, 2014
Journal Drying Technology
Print ISSN 0737-3937
Electronic ISSN 0737-3937
Publisher Taylor & Francis
Peer Reviewed Peer Reviewed
Volume 31
Issue 11
DOI https://doi.org/10.1080/07373937.2013.788509
Keywords Feed rate, Inlet temperature, Microencapsulation, Probiotics, Survival
Public URL http://eprints.nottingham.ac.uk/id/eprint/2630
Publisher URL http://www.tandfonline.com/doi/full/10.1080/07373937.2013.788509#.UzB_kah_s9Y
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-nc/4.0





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