(a) Effect of ionic strength on the percentage of fluorescence hypochromicity while 27Bcl2 interacts with porphyrin drugs.

S. No.	Ionic strength of KBPES buffer (pH7.0)	Stoichiometry DNA : drug	Percentage of fluorescence hypochromicity
1.	TMPyP4 with 27BCL2
1.a	30 mM	1 : 4	34.2%
1.b	100 mM	1 : 4	28.5%
1.c	200 mM	1 : 4	20.3%
1.d	600 mM	1 : 4	6.5%
2.	TMPyP3 with 27BCL2
2.a	30 mM	1 : 2	59.8%
		1 : 3	51.5%
2.b	100 mM	1 : 2	52.5%
		1 : 3	49.5%
2.c	200 mM	1 : 2	33.6%
		1 : 3	16.6%
2.d	600 mM	1 : 2	8.6%
		1 : 3	4.9%
3.	TMPyP2 with 27BCL2
3.a	30 mM	1 : 2	37.4%
		1 : 3	40.2%
3.b	100 mM	1 : 2	11.9%
		1 : 3	12.3%
3.c	200 mM	1 : 2	6.5%
		1 : 3	4.4%
3.d	600 mM	1 : 2	0.7%
		1 : 3	0.3%