Anandharamakrishnan et al _2010_ Dairy Sci Technol.pdf (2.3 MB)
Spray-freeze-drying of whey proteins at sub-atmospheric pressures
journal contribution
posted on 2011-05-04, 09:25 authored by C. Anandharamakrishnan, Chris RiellyChris Rielly, Andy StapleyAndy StapleySpray-freeze-drying (SFD) involves spraying a solution into a cold medium,
and freeze-drying the resultant frozen particles, which can be performed by contacting the particles with a cold, dry gas stream in a fluidized bed, typically
at atmospheric pressure. This enables much faster drying rates than are
usually possible by conventional freeze-drying, due to the small particle sizes
involved. However, the quantities of gas required for atmospheric fluidized
bed freeze-drying are prohibitively expensive. This has led to a process
modification whereby fluidization is performed at sub-atmospheric pressures,
which still allows rapid freeze-drying, but using much less gas. This study
demonstrates the fluidized bed spray-freeze-drying technique at sub-atmospheric pressures (0.1 bar) using whey protein isolate solution (20% w/w
solids) at gas inlet drying temperatures ranging from -10°C to -30°C. The
process yields a powder consisting of highly porous particles and shows little
loss of solubility for β-lactoglobulin and a-lactalbumin, the principal proteins in
the isolate. A wet basis moisture content of 8.1% was achieved after freeze
drying at -10 °C for only 1 hour, whilst at 30 °C a longer drying time (100 minutes) produced a wetter product (14% w.b.).
History
School
- Aeronautical, Automotive, Chemical and Materials Engineering
Department
- Chemical Engineering
Citation
ANANDHARAMAKRISHNAN, C., RIELLY, C.D. and STAPLEY, A.G.F., 2010. Spray-freeze-drying of whey proteins at sub-atmospheric pressures. Dairy Science and Technology, 90 (2-3), pp. 321-334.Publisher
© EDP Sciences / © INRAVersion
- AM (Accepted Manuscript)
Publication date
2010Notes
The original publication is available at: http://dx.doi.org/10.1051/dst/2010013ISSN
1958-5586;1958-5594Publisher version
Language
- en