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Microencapsulation by spray-drying of bioactive compounds extracted from blackberry (rubus fruticosus)

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Abstract

Blackberry aqueous extract acidified with 2 % citric acid was spray-dried using gum Arabic (GA) and polydextrose (PD) as encapsulating agents at concentrations of 10 and 15 % and temperatures of 140 to 160 °C. All powders presented high solubility, ranging from 88.2 to 97.4 %, and the encapsulation conditions did not significantly affect the hygroscopicity. The powders produced with gum Arabic showed higher brightness than those with polydextrose. The anthocyanins retention in the microcapsules was 878.32 to 1300.83 mg/100 g, and the phenolics was 2106.56 to 2429.22 mg (GAE)/100 g. The antioxidant activity was quantified according to DDPH and ABTS methods, with values ​​ranging from 31.28 to 40.26 % and 27 to 45.15 %, respectively. The microscopy showed spherical particles for both encapsulating agents, and smooth surface with some concavities with the gum Arabic, and smooth or slightly rough surface when using polydextrose. The Pearson correlation coefficient showed a high correlation between the color parameters, L*, a*, b*, Hue, Chroma and browning index (BI), which were also strongly correlated with anthocyanins. Phenolic presented correlation with DPPH and ABTS values. The results showed that the best encapsulation condition was atomization at 140 °C and 15 % gum Arabic.

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Acknowledgments

This work was supported by FAPERGS, CAPES and CNPq, Brazil.

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Authors and Affiliations

  1. Institute of Food Science and Technology, Federal University of Rio Grande do Sul, Av. Bento Gonçalves, n° 9500, Porto Alegre, RS, CEP 91501-970, Brazil

    Renata Trindade Rigon & Caciano P. Zapata Noreña

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  1. Renata Trindade Rigon
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  2. Caciano P. Zapata Noreña
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Correspondence to Caciano P. Zapata Noreña.

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Rigon, R.T., Zapata Noreña, C.P. Microencapsulation by spray-drying of bioactive compounds extracted from blackberry (rubus fruticosus). J Food Sci Technol 53, 1515–1524 (2016). https://doi.org/10.1007/s13197-015-2111-x

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  • DOI: https://doi.org/10.1007/s13197-015-2111-x

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