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

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.

Microencapsulation of spinach extract using binary blends of biopolymers: A comparison between freeze drying and spray drying approaches

“…Similar results were reported by others (Rajabi et al, 2015;Rezende et al, 2018;Xin et al, 2022). Valková et al (2022) observed that increasing the total solids content of feed increased the powder yield of spray-dried and freeze-dried β-glucan powder.…”

Obtention of Sacha Inchi (Plukenetia volubilis Linneo) Seed Oil Microcapsules as a Strategy for the Valorization of Amazonian Fruits: Physicochemical, Morphological, and Controlled Release Characterization

“…To obtain the microcapsules, different drying technologies can be used, including spray-drying (SD) and freeze-drying (FD). The advantages of the SD method include ease of industrialization, cost-effectiveness, high production and throughput, compatibility with many coating materials, and the possibility of handling thermolabile materials due to the short drying times [ 21 ]. However, the quality of the spray-dried microcapsule is highly dependent on the set operating parameters [ 22 ].…”