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Spray-Drying Microencapsulation of Polyphenol Bioactives: A Comparative Study Using Different Natural Fibre Polymers as Encapsulants

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Abstract

This research explores the spray-drying microencapsulation of polyphenols (PPs), quercetin and vanillin, using four different fibre polymers as encapsulants (sodium alginate, methyl β-cyclodextrin (MβCD), hydroxypropylmethyl cellulose (HPMC) and inulin). The microstructure, physico-chemical properties, PP content and reconstitution properties in water of the spray-dried powders were systematically evaluated and compared. Techniques used for powder characterisation were scanning electron microscopy, N2 physisorption, Fourier transform infrared (FT-IR) spectroscopy and water activity measurements. High-performance liquid chromatography and viscosity measurements were used to characterise the solutions obtained by reconstitution of the spray-dried powders in methanol or water, respectively. Results show that the type of encapsulant strongly influenced powder morphology, powder surface area and encapsulation efficiency of PPs. Powders prepared using sodium alginate and MβCD possessed more spherical particle shape, smaller average particle size and higher specific surface area than those using HPMC or inulin as encapsulants. For each encapsulant, higher encapsulation efficiencies were achieved for vanillin (37–53 %) than quercetin (9–19 %). Encapsulation efficiencies were inulin > MβCD > HPMC > sodium alginate for vanillin-containing powders. Inulin, MβCD and sodium alginate all gave similar encapsulation efficiencies for quercetin-containing powders. All powders possessed low water activity and excellent dissolution properties in water. Therefore, spray-drying microencapsulation using natural fibre encapsulants is a feasible approach for delivering the dual health benefits of PPs and dietary fibre to consumers. Spray-drying yields a product in a convenient powder form, which can be reconstituted in water or other beverages for direct consumption or used as a functional additive in solid food systems.

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Acknowledgements

We acknowledge research funding from The University of Auckland and Plant and Food Research.

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Authors and Affiliations

  1. Mt. Albert Research Centre, The New Zealand Institute for Plant and Food Research Limited, Private Bag, 92169, Auckland, New Zealand

    Dongxiao Sun-Waterhouse & Sandhya S. Wadhwa

  2. School of Chemical Sciences, The University of Auckland, Private Bag, 92019, Auckland, New Zealand

    Geoffrey I. N. Waterhouse

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  1. Dongxiao Sun-Waterhouse
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  2. Sandhya S. Wadhwa
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  3. Geoffrey I. N. Waterhouse
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Correspondence to Geoffrey I. N. Waterhouse.

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Sun-Waterhouse, D., Wadhwa, S.S. & Waterhouse, G.I.N. Spray-Drying Microencapsulation of Polyphenol Bioactives: A Comparative Study Using Different Natural Fibre Polymers as Encapsulants. Food Bioprocess Technol 6, 2376–2388 (2013). https://doi.org/10.1007/s11947-012-0946-y

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