Table 5.

The numbers of eluted Salmonella entrica serovar Typhimurium from surface of lettuce by alkaline water and different alkaline buffers.

Buffers pH	Salmonella entrica serovar Typhimurium initial inoculation: 1.5×108 cfu/ml
	pH=9		pH=9.5		pH= 10
	cfu/ml	% recovery	cfu/ml	% recovery	cfu/ml	% recovery
PBS	NG	0	1×107	85.62	1.5×105	63.30
Gly	1×106	73.38	1.2×106	74.35	NG	0
Gly-T-BE	NG	0	3.3×106	79.73	NG	0
BPW	6×107	95.15	1.46×108	99.85	1.2×108	98.81
ADW	7×107	96	1.42×108	99.70	5.5×106	82.44

NG= not growth; cfu/ml= colony forming units per milliliter; % recovery= log final cfu/ml / log initial cfu/ml×100; PBS= phosphate buffer saline; Gly= 0.05 M glycine; Gly-T-BE= 0.05 M glycine-100 mM Tris base-%1 (w/v) beef extract; BPW=buffer peptone water; ADW=alkalinedistilled water.