“…However, with arousing awareness on lactose abundance in dairy effluents, cheaper and more versatile substrates, such as whey (Fischer & Kleinschmidt, 2015;Geiger et al, 2016;Sen et al, 2016) and whey permeate (Eskandarloo & Abbaspourrad, 2018;Mano et al, 2018), or even milk (Cao et al, 2017;Zhu et al, 2018), have been taken into account. Also, despite the fact that the various methods for the immobilization of b-galactosidases were proposed so far (Giacomini et al, 1998;Albayrak & Yang, 2002;Torres et al, 2003;Gaur et al, 2006;Grosov a et al, 2008;Neri et al, 2009;Guidini et al, 2010;Klein et al, 2012;Urrutia et al, 2013;Carevi c et al, 2016b;de Albuquerque et al, 2018;Levin et al, 2018;Guerrero et al, 2019;Kessi & Arias, 2019), the examples of immobilized enzyme preparations utilized in these reactions are rather scarce (Jovanovic-Malinovska et al, 2012;de Albuquerque et al, 2018;Eskandarloo & Abbaspourrad, 2018).…”