Particle formulation of hydroalcoholic rosemary (Rosmarinus officinalis L.) extracts using a spouted bed--颗粒学报PARTICUOLOGY

Peshev, D., Eichner, E., Goslinska, M., Pietsch, S., Trambabova, Y., Terzieva, T., . . . Heinrich, S. (2020). Particle formulation of hydroalcoholic rosemary (Rosmarinus officinalis L.) extracts using a spouted bed. Particuology, 51, 26-34. https://doi.org/10.1016/j.partic.2019.10.002

Particle formulation of hydroalcoholic rosemary (Rosmarinus officinalis L.) extracts using a spouted bed

D. Peshev ^a *, E. Eichner ^b, M. Goslinska ^b, S. Pietsch ^b, Y. Trambabova ^c, T. Terzieva ^c, N. Georgieva ^c, S. Heinrich^b

a Department of Chemical Engineering, University of Chemical Technology and Metallurgy, 1576 Sofia, Bulgaria
b Institute of Solids Process Engineering and Particle Technology, Hamburg University of Technology, 21073 Hamburg, Germany
c Department of Biotechnology, University of Chemical Technology and Metallurgy, 1576 Sofia, Bulgaria

10.1016/j.partic.2019.10.002

Volume 51, August 2020, Pages 26-34

Received 17 April 2019, Revised 4 October 2019, Accepted 8 October 2019, Available online 26 November 2019, Version of Record 11 April 2020.

E-mail: d.peshev@uctm.edu

Highlights

• Polyphenolic extracts are directly applied in spouted-bed encapsulation.

• A batch spouted-bed process is used for the encapsulation.

• Active constituents are quantitatively transferred from the extracts into particles.

• Maltodextrin with dextrose equivalent 6 is sufficient as a sole carrier and shell material.

Abstract

In this study, spouted bed technology was applied to the protection and functionalization of polyphenolic rosemary extracts. First, solid–liquid extraction was performed at 25 °C with ethanol–water. The ethanol–water ratio was chosen to obtain high phenolic acid and diterpene concentrations in the extract. The selected solvent composition gave liquid extracts that could be directly added to a coating mixture for feeding into a spouted bed apparatus. Thus, no preliminary solvent exchange or evaporation of the extraction solvent to dryness was required. Food grade Paselli MD 6 maltodextrin and HiCap 100 modified starch were used as inert core and shell materials in the spouted bed encapsulation process under mild operating conditions. The antioxidant activity of the fresh extract was retained during processing, which indicated that the active constituents were preserved and quantitatively transferred into the encapsulated formulations, which were readily soluble in water. The obtained powders were composed of nearly spherical particles. Their compositions, water solubilities, and particle morphologies make them a strong candidate for food and beverage applications as natural antioxidants, preservatives, or functional ingredients.

Graphical abstract

Keywords

Particle; Polyphenolic rosemary extract; Encapsulation; Spouted bed; Bioactive; Antioxidant

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