Disinterested Sentiment is not directly and plainly recognized by Plato.

His highest virtue is self-regarding; a concern for the Health of the Soul.
III .-- On the Bonum, or Summum Bonum, Plato is ascetic and self-denying.

1.

We have seen that in Philebus, Pleasure is not good, unless united with Knowledge or Intelligence; and the greater the Intelligence, the higher the pleasure.

That the highest happiness of man is the pursuit of truth or Philosophy, was common to Plato and to Aristotle.
2.