Association studies of aggregated aqueous lutein diphosphate with human serum albumin and α1-acid glycoprotein in vitro: Evidence from circular dichroism and electronic absorption spectroscopy

Lutein diphosphate salt (LdP) retains the spectroscopic characteristics of natural source lutein in organic solvent, and forms H- and J-type aggregates in aqueous solution-without evidence of stoichiometric binding to human serum albumin (HSA) in vitro.