TABLE 2.

Physicochemical characteristics of the bacterial strains and dominant constituents of their outer surfaces

		ζ-potential (pH = 3)	ζ-potential (min)		Outer surface
Strain	pI*	[mV]*	[mV]*	θ0*	Polymer properties	Dominant surface constituents
L. johnsonii DSM20533	3.7	1.0	−5.1	0.07	Heterogenous, crosslinked	Neutral polysaccharides
L. johnsonii ATCC332	<3	−6.2	−25.3	0.53	Heterogeneous	(Lipo) teichoic acids
L. johnsonii ATCC33200	4.1	2.9	−13.0	0.08	Short, single polymers	Anionic polysaccharides
L. crispatus DSM20584	4.9	21.8	−29.2	0.75	Compact conformation	S-layer proteins
L. helveticus ATCC12046	3.9	2.7	−22.9	0.10	Heterogeneous, long, extended polymers	Anionic polysaccharides
L. helveticus ATCC15009	3.7	2.8	−16.3	0.01	Compact conformation, extended surface polymers	Anionic polysaccharides

^*In 10 mM KH₂PO₄-buffer.