Antilisterial Activity of Some Plants Used in Folk Medicine

Figures & data

Table 1 The names and origins of the plants used in this study.

Plantago major.	B4: Ankara: Kızılcahamam, 1000 m, 22.7.2002, AEF 22910
Ononis spinosa.	B4: Ankara: Kızılcahamam, 1000 m, 22.7.2002, AEF 22911
Lythrum salicaria.	B4: Ankara: Kızılcahamam, 1000 m, 22.7.2002, AEF 22912
Juglans regia.	B4: Ankara: Kızılcahamam, 1500 m, 22.7.2002, AEF 22944
Teucrium polium.	B4: Ankara: Kızılcahamam, 1000 m, 22.7.2002, AEF 22924
Centranthus longiflorus.	B4: Ankara: Kızılcahamam, 1000 m, 22.7.2002, AEF 22925

Table 2 Characteristics differentiating the species of the genus Listeria..

Characteristics	L. monocytogenes.	L. innocua.	L. ivanovii.	L. murrayi.
Gram stain	+	+	+	+
β-hemolysis	+	−	+	−
Mannitol	−	−	−	+
Hippurate	+	+	+	−
Voges proskauer	+	+	+	+
Esculin	+	+	+	+
CAMP-test S. aureus.	+	−	+	−

Table 3 Antilisterial activity of aqueous extracts of the plants (minimum inhibitory concentraion, µg/ml).

Sample name	L.monocytogenes.	L. ivanovii.	L. innocua.	L. murrayi.
Centranthus longiflorus.	25	NT	12.5	NT
Juglans regia.	12.5	25	NT	12.5
Lythrum selicaria.	50	NT	12.5	NT
Ononis spinosa.	12.5	50	NT	NT
Plantago major.	50	100	12.5	50
Teucrium polium.	50	NT	12.5	50
Ofloxacin	3.125	6.25	6.25	6.25

NT, not tested. Because these extracts have no growth inhibition zone in the diffusion method, they were note tested here.

Table 4 The diameters (mm) of inhibition zones of free and ethanolic extracts of the plants.

Samplename	L. monocytogenes.	L. ivanovii.	L. innocua.	L. murrayi.
Centranthus longiflorus.	10	0	14	0
Juglans regia.	13	10	0	10
Lythrum selicaria.	8	0	11	0
Ononis spinosa.	15	9	0	0
Plantago major.	12	9	15	10
Teucrium polium.	11	0	11	10
Ofloxacin	22	20	20	20