Abstract
ABSTRACTIndustrial production of lactose hydrolyzed milk powder (LHMP) remains challenging. Due to the presence of the monosaccharides glucose and galactose, lactose-free powders tend to suffer stickiness, caking, and browning during drying and storage. We sought to find ideal conditions spray dryer inlet air temperature (θair,in) and concentrated milk flow rate (mCM) for LHMP production. We tested θair,in settings of 115–160°C and mCM of 0.3–1.5 kg · h−1, and also applied mass and energetic balances. LHMP generally exhibited higher mass and energetic losses than the control (milk powder containing lactose), as a consequence of the relatively low dryability of LHMP. For a lab scale spray dryer, the ideal conditions settings for LHMP production were θair,in = 145 ± 2°C and mCM = 1.0 kg · h−1, taking into account the mass yield and energetic cost (kJ · kg−1 of powder) of the process. These ideal conditions are a potential tool for the industrial development of lactose-free dairy powders.
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