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Paclitaxel (PTX), an antimitotic drug from the taxanes group, prevents the proliferation of breast cancer cells through mitosis arrest and activation by a cascade of signaling pathways that lead to apoptosis. Mitochondria is one of the important signaling routes for inducing apoptosis. For mitochondria targeting, triphenylphosphonium (TPP) with a delocalized charge and hydrophobic nature was utilized as a moiety to facilitate penetration through a phospholipid membrane of mitochondria. PTX-TPP was synthesized via pH-sensitive ester bond between hydroxyl groups of PTX and carboxylic acid of (4-carboxybutyl) TPP. Then PTX-TPP prodrug encapsulated in alginate nanoparticles, which were self-assembled by the ionotropic complexation technique for enhancement of mitochondrial apoptosis in breast cancer cells. The loading of PTX-TPP conjugation in self-assembled alginate nanoparticles was 16.5% and the particle size of nanoparticles was 123 nm with zeta potential around - 25.8 Mv. The in vitro cytotoxicity and IC50 of PTX-TPP nanoparticles in the growth of MCF7 cancer cell increased 6.3-fold higher than free PTX. The early apoptotic cells and the late apoptotic/necrotic cells for PTX-TPP nanoparticles were 11.6 and 3.9-fold higher than free PTX. This study indicated this mitochondrial-targeted self-assembled nanoparticles can inhibit the tumor cell growth of breast cancer., (© 2024. The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.)