Survival of Unstressed and Acid-, Cold-, and Starvation-Stress-Adapted Listeria monocytogenes in Ham Extract with Hops Beta Acids and Consumer Acceptability of HBA on Ready-to-Eat Ham

Table 2

Means (S.E.) of lag phase duration (LPD) and growth rate (GR) of unstressed and acid-, cold-, and starvation-stress-adapted L. monocytogenes during exposure to hops beta acids (HBA) in ham extract calculated using the Baranyi Full Growth Model in DMFIT software.

Type of stress	HBA; concentration	LPD; (days)	GR; (/ml/day)
Unstressed	0.0 mg/L (control)	2.49^a (0.79)	0.39^a (0.03)	0.99
	4.44 mg/L	3.49^a (1.30)	0.29^b (0.03)	0.98
	10.0 mg/L	12.98^b (3.14)	0.24^b (0.07)	0.93
Acid	0.0 mg/L (control)	2.33^a (0.46)	0.50^c (0.02)	0.99
	4.44 mg/L	2.89^a (0.46)	0.48^c (0.02)	0.99
	10.0 mg/L	3.42^a (0.88)	0.44^c (0.03)	0.99
Cold	0.0 mg/L (control)	—	0.71^d (0.02)	0.99
	4.44 mg/L	—	0.65^d (0.01)	0.99
	10.0 mg/L	—	0.50^c (0.01)	0.99
Starvation	0.0 mg/L (control)	3.26^a (0.73)	0.68^d (0.07)	0.99
	4.44 mg/L HBA	3.30^a (0.40)	0.66^d (0.03)	0.99
	10.0 mg/L HBA	5.44^a (1.13)	0.57^c (0.07)	0.97

—: Lag phase duration is not detected.
Means in the same column with the same superscript letter were not significantly different ().