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. 2022 Jul 29;11(15):2267.
doi: 10.3390/foods11152267.

Impact of Freeze- and Spray-Drying Microencapsulation Techniques on β-Glucan Powder Biological Activity: A Comparative Study

Veronika Valková  1 , Hana Ďúranová  1 , Aude Falcimaigne-Cordin  2 , Claire Rossi  2 , Frédéric Nadaud  3 , Alla Nesterenko  4 , Marvin Moncada  5 , Mykola Orel  1 , Eva Ivanišová  6 , Zuzana Chlebová  1 , Lucia Gabríny  1 , Miroslava Kačániová  7   8
Affiliations

Impact of Freeze- and Spray-Drying Microencapsulation Techniques on β-Glucan Powder Biological Activity: A Comparative Study

Veronika Valková et al. Foods. .

Abstract

The study compares the impact of freeze- and spray-drying (FD, SD) microencapsulation methods on the content of β-glucan, total polyphenols (TP), total flavonoids (TF), phenolic acids (PA), and antioxidant activity (AA) in commercially β-glucan powder (Pleurotus ostreatus) using maltodextrin as a carrier. Morphology (scanning electron microscopy- SEM), yield, moisture content (MC), and water activity (aw) were also evaluated in the samples. Our examinations revealed significant structural differences between powders microencapsulated by the drying methods. As compared to non-encapsulated powder, the SD powder with yield of 44.38 ± 0.55% exhibited more reduced (p < 0.05) values for aw (0.456 ± 0.001) and MC (8.90 ± 0.44%) than the FD one (yield: 27.97 ± 0.33%; aw: 0.506 ± 0.002; MC: 11.30 ± 0.28%). In addition, the highest values for β-glucan content (72.39 ± 0.38%), TPC (3.40 ± 0.17 mg GAE/g), and TFC (3.07 ± 0.29 mg QE/g) have been detected in the SD powder. Our results allow for the conclusion that the SD microencapsulation method using maltodextrin seems to be more powerful in terms of the β-glucan powder yield and its contents of β-glucan, TP, and TF as compared to the FD technique.

Keywords: DPPH assay; SEM; biologically active substances; freeze-drying; maltodextrin; microencapsulation; spray-drying; β-glucan.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
SEM images of β-glucan powder microencapsulated by: FD (A–C); and SD (D–F); methods using MD as wall material. The following magnification was applied: (A,D)—250×; (B,E)—1000×; (C,F)—2500×.
See this image and copyright information in PMC

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