Para-hydrogen perspectives in hyperpolarized NMR.

Highlights: [•] Application of para-hydrogen polarized samples as molecular imaging agents and future challenges. [•] Detection of minute substance amounts for reactor monitoring and trace analysis. [•] Use of PHIP in inhomogeneous fields and in time domain experiments. [•] Recent developments of PHIP phenomena in ultra-low field and zero-field NMR. [ABSTRACT FROM AUTHOR]