Binding of Sudan II and IV to lecithin liposomes and E. coli membranes: insights into the toxicity of hydrophobic azo dyes

Table 1 Standard curves for determination of Sudan red compounds in ethanol and pH 7.0 phosphate buffer solution (PBS)

Chemical	Upper limit, nM	Wave- length, nm	Medium	Linear equations	Linear correlation coefficient
Sudan II	40	495	ethanol	A = 0.0155C_L (2)	0.9982
Sudan II	1.2	495	PBS *	A = 0.0121C_L - 0.001 (3)	0.9993
Sudan IV	0.6	515	ethanol	A = 0.0318C_L - 0.0018 (4)	0.9990
Sudan IV	5	515	PBS	A = 0.0196C_L- 0.0007 (5)	0.9990

ISSN: 1472-6807