engleski

The study of adsorption kinetics of flavan-3-ols, dihydrochalcones and anthocyanins onto barley β-glucan

Polyphenols can interact with dietary fibers and these interactions can affect polyphenols bioactivities. The interactions can be studied with the adsorption process, and adsorptions of flavan-3-ols (procyanidin B1, procyanidin B2), dihydrochalcones (phloretin, phloretin-2- glucoside), and anthocyanins (cyanidin-3- glucoside, cyanidin-3-galactoside) onto β-D-glucan from barley were studied in this work. The intention was to reveal the kinetics of the adsorption process. Adsorption was carried out using model solutions at room temperature. The results showed that in the flavan-3-ol group procyanidin B1 showed higher adsorption capacity than procyanidin B2. Phloretin showed a higher adsorption capacity than phloretin-2-glucoside in the dihydrochalcone group and anthocyanins showed similar adsorption capacities. Parameter k1 for all polyphenols was in the range from 0.30 h-1 to 0.93 h-1. Adsorption capacity qe for all polyphenols ranged from 2.90 mmol g-1 to 9.76 mmol g-1, parameter k2 was in the range 70 - 225 g mol- 1 h-1, and adsorption capacities qe ranged from 3.70 mmol g-1 to 9.90 mmol g-1.

flavan-3-ol ; dihydrochalcone ; anthocyanin ; β-D-glucan ; kinetic models

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