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. 2018 Sep;56(3):381–397. doi: 10.17113/ftb.56.03.18.5285

Table 6. Predicting shelf life time and specific rate of bacterial survival, change in moisture content and water activity of powders.

Temperature/°C	Culture medium powder							Optimized powder
	Bacterial survival			w(moisture)/%		a_w		Bacterial survival			w(moisture)/%		a_w
	k_m/day	R²	Shelf life/day	k_x/day	R²	k_w/day	R²	k_m/day	R²	Shelf life/day	k_x/day	R²	k_w/day	R²
4	–0.043	0.94	54.89	0.0106	0.95	0.0065	0.80	–0.12	0.94	23.03	0.0084	0.84	0.0080	0.85
25	–0.039	0.84	57.51	0.0113	0.94	0.0087	0.94	–0.39	0.88	7.66	0.0145	0.92	0.0101	0.88
37	–1.19	0.98	2.78	0.0160	0.91	0.0106	0.92	–1.08	0.94	3.23	0.0163	0.95	0.0123	0.95

k_m=specific viability loss (day^–1), k_x=specific moisture content change rate (day^–1), k_w=specific water activity change rate (day^–1)