Moisture sorption isotherms for crystalline, amorphous and predominantly crystalline lactose powders
2004
Bronlund, John | Paterson, Tony
Moisture sorption isotherms for amorphous lactose, crystalline α-lactose monohydrate and a predominantly crystalline lactose powder were measured. No temperature dependence was observed over the range investigated (12–40°C), except for amorphous lactose at 12°C, which absorbed less moisture than observed at higher temperatures. The amount of water absorbed by crystalline powders at high water activity was dependent on the packing density of the powder. This observation could be explained using the capillary condensation theory. The moisture isotherm of a partially amorphous lactose powder was successfully predicted by using a simple additive isotherm model to combine the isotherms of crystalline and amorphous lactose powders. Small quantities of amorphous lactose present on crystalline powders, causes significant changes to the moisture sorption isotherm. If the high water activity region of the isotherm of crystalline α-lactose monohydrate is of interest then the isotherm should be measured at the packing density of interest.
Show more [+] Less [-]AGROVOC Keywords
Bibliographic information
This bibliographic record has been provided by National Agricultural Library