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±êÌ⣺¡°pH phoresis¡±:A new concept that can be used for improving drug delivery to tumor cells
ͻ񻣼We propose a new concept describing how nanoparticles composed of weak polybases(such as polyamines)
would behave when they are exposed to a pH gradient;weak polybase-containing particles will tend to
accumulate preferentially in low pH regions under a pH gradient environment.This phenomenon,which
we term¡°pH phoresis¡±,may provide a useful mechanism for improving the delivery of drugs to cancer
cells in solid tumor tissues.

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