Water Adsorption Isotherms and Storage Stability of Freeze-Dried Bovine Colostrum Powder

Figures & data

Figure 1 Moisture sorption isotherms of FDBC powder at three temperatures.

Table 1  Constants of the isotherm models for FDBC powder

		Temperature (°C)
Mathematical equation	Constants	15	25	35
BET^a	M 0 (g H2O/100 g dry solids)	5.346	4.840	4.484
	C	14.276	17.211	13.783
	E (%)	4.25	1.90	1.00
	RMSE (%)	3.80	1.59	0.80
	SEE	0.42	0.12	0.05
	R ^2	0.993	0.983	0.983
	Residual plot	Random	Random	Random
GAB	M 0 (g H2O/100 g dry solids)	6.561	5.505	5.600
	C	10.091	13.874	9.241
	K	0.846	0.882	0.853
	E (%)	3.81	2.12	4.17
	RMSE (%)	4.65	2.63	4.72
	SEE	0.54	0.31	0.39
	R ^2	0.994	0.997	0.995
	Residual plot	Random	Random	Random
^aOnly experimental data with aw < 0.50 were fitted to the BET model.

Figure 2 Comparison between experimental data and predicted data of freeze-dried bovine colostrum powder at 25°C.

Figure 3 Changes in moisture content (g H₂O/100 g dry solids) of FDBC powder packaged in ALPE pouches during storage at 25°C and 50% RH.

Figure 5 Changes in IgG concentration (g/100 g dry solids) of FDBC powder packaged in ALPE pouches during storage at 25°C and 50% RH.

Figure 4 Changes in color difference (ΔE) of FDBC powder packaged in ALPE pouches during storage at 25°C and 50% RH.

Table 2  Regression analysis of color change and IgG concentration from zero- and first-order reaction kinetics of FDBC powder packaged in ALPE pouches

	Zero order			First order
Parameters	K 0	C 0	R	K 1	C 0	R
Color change	0.084	2.516	0.989	0.018	2.753	0.986
IgG concentration	−0.0155	5.934	0.902	−0.00279	5.934	0.913