We report new constraints on flavor-changing non-standard neutrino interactions from the MINOS long-baseline experiment using $ u_{e}$ and $bar{ u}_{e}$ appearance candidate events from predominantly $ u_{mu}$ and $bar{ u}_{mu}$ beams. We used a statistical selection algorithm to separate $ u_{e}$ candidates from background events, enabling an analysis of the combined MINOS neutrino and antineutrino data. We observe no deviations from standard neutrino mixing, and thus place constraints on the non-standard interaction matter effect, $|varepsilon_{etau}|$, and phase, $(delta_{CP}+delta_{etau})$, using a thirty-bin likelihood fit.
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