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In the present work the influence of reducing agent dithiothreitol doping on photoluminescence spectra of nanotubes with adsorbed biopolymers (single stranded DNA and polyC) in aqueous suspensions and films was studied. It is revealed that greater intensity enhancement at 10 -3 mol/L dithiothreitol concen tration is observed for (7,5) and (6,5) nanotubes in suspension with single stranded DNA (by more than 150% of initial intensity) comparing to polyC suspension (less than 60%) while for (6,4) and (9,1) nanotubes enhancement is less than 50% for both suspensions. Photoluminescence intensity increasing for nanotube film with DNA is less than 50% without noticeable dependence on nanotube chirality. It is assumed, that dif ferent influence of biopolymers on nanotube luminescence intensity enhancement is due to their different coverage of nanotube surface.