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Critical micelle concentration (CMC) determination of biotin-graft-poly(lactic acid) (PLA). (A) Excitation spectra of pyrene from 300–360 nm as a function of biotin-graft-PLA concentration in water. (B) Intensity ratio (328/326) of pyrene versus logarithm concentration of poly(ethylene glycol)-graft-PLA. CMC was 7.1 × 10−4 mg/mL, determined by taking the midpoint in the plot of (B).
