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Aim of the study Effect of internalized phthalyl starch nanoparticles (PSNs) on the antimicrobial ability of Lactococcus lactis (LL) KCTC 2013. Methods and results Phthalyl starch nanoparticles (PSNs) were prepared by self-assembly of phthalyl starch and the amount of the hydrophobic phthalic moieties were characterized by nuclear magnetic resonance (NMR), PSN1 (DS 14.3 mol.-%), PSN2 (DS 17.8 mol.-%) and PSN3 (DS 30.4 mol.-%), the sizes of PSN1, PSN2, and PSN3 measured by dynamic light scattering (DLS) were 364.7, 248,4 and 213.4 nm resp