Naslov
Optimizacija i kinetika otpuštanja vodenih ekstrakata Stevia rebaudiana od mikročestica na bazi alginata
(Optimization and release kinetics of Stevia rebaudiana aqueous extracts from alginate-based microparticles)

Autori
Marijan, Marijan ; Kolar, Sara ; Jurić, Slaven ; Vlahoviček-Kahlina, Kristina ; Vinceković, Marko

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, ostalo

Izvornik
56. HRVATSKI I 16. MEĐUNARODNI SIMPOZIJ AGRONOMA / Rožman, Vlatka ; Antunović, Zvonko - Osijek, 2021, 165-165

Skup
56. hrvatski i 16. međunarodni simpozij agronoma

Mjesto i datum
Vodice, Hrvatska, 05.09.2021. - 10.09.2021

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
ekstrakcija, optimizacija, inkapsulacija, Stevia rebaudiana, mikročestice
(extraction, optimization, encapsulation, Stevia rebaudiana, microparticles)

Sažetak
Stevia rebaudiana (Bertoni) represents a natural source of polyphenolic compounds. The extraction of polyphenols in aqueous medium from stevia leaves powder was achieved using an ultrasound-assisted extraction technique. Optimization of the extraction procedure was performed using response surface methodology and was used to determine optimal conditions (6 g L-1, 75A and 6 min) for extraction in terms of total polyphenolic compounds content (465.17 mg L-1). Optimal extracts were used for the preparation of calcium-alginate and calcium-alginate/casein microparticles. Release kinetics were observed as a cumulative release (%) of total polyphenolic compounds from dry microparticles. Both kinetics curves showed a similar release pattern with a significantly higher maximum cumulative release for calcium-alginate microparticles. The microcapsules were also compared based on different parameters such as encapsulation efficiency (EE %), loading capacity (LC), relative size and swelling degree both in water and acidic medium. Calcium-alginate/casein microparticles showed enhanced results in comparison with calcium-alginate microparticles with higher EE % (5.3%), LC (44.3%) and size (11.9%) values for 1 mm nozzle. Similar results were obtained for 0.75 mm nozzle with increased values of EE % (8.2%), LC (248.4%) and particle size (10.1%). The obtained results showed that there is a significant influence of different matrices on the physicochemical properties of microparticles.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA