TABLE 2.

Adsorption of viruses to DEAE-Sepharose^a

Virus	Slopeb	Correlation (r)	Adsorption groupc
MS2	−170 ± 26 A	0.88	I
E1	−160 ± 17 A	0.87	I
φX174	−130 ± 26 AB	0.71	I
CB4	−115 ± 22 B	0.82
T3	−110 ± 21 B	0.81
T7	−110 ± 21 B	0.81
CB5	−105 ± 15 B	0.89
E4	−100 ± 19 B	0.82
f2	−95 ± 15 BC	0.87
P1	−65 ± 20 C	0.80	II
T4	−65 ± 10 C	0.88	II
T2	−30 ± 4 D	0.91	II
E5	−6 ± 8 E	0.08

^aThe amount of virus adsorbed as the ionic strength of the solution was increased was determined and plotted as a percentage of the number of viruses in the portion of the solution that was not mixed with DEAE-Sepharose.

^bThe slope was determined by dividing the percentage of virus adsorbed by the ionic strength of the solution. The values are means ± standard deviations for triplicate determinations. Values followed by the same letter are not significantly different at a P value of >0.05. The weakest electrostatic interaction is represented by the slope of −170 ± 26 (MS2), and the strongest electrostatic interaction is represented by the slope of −6 ± 8 (E5).

^cVirus groups described by Gerba and Goyal (10).