The microstructures of spray-dried whole milk powders with 0, 27, 38, 48, 58, and 67% lactose were evaluated. Delactosed milk concentrates were prepared by ultrafiltration and diafiltration, and the lactose concentration in the powders was adjusted by addition of lactose to the spray-dried feed. Milk powder particles with 0% lactose had a more porous matrix with deep dents and wrinkles; lower true and apparent particle densities; and larger median diameter, vacuole volume, surface area, and free fat content. Higher lactose concentrations produced nearly spherical particles with a less porous matrix; higher true and apparent particle densities; and smaller median diameter, vacuole volume, surface area, and free fat content. Whole milk powder with modified lactose content may have potential in the manufacture of milk chocolate.
All Science Journal Classification (ASJC) codes
- Food Science
- Animal Science and Zoology