  The origin of chirality, closely related to the evolution of life on the
earth, has long been debated. In 1991, Abdus Salam suggested a novel approach
to achieve biomolecular homochirality by a phase transition. In his subsequent
publication, he predicted that this phase transition could eventually change
D-amino acids to L-amino acids as C -H bond would break and H atom became a
superconductive atom. Since many experiments denied the configuration change in
amino acids, Salam hypothesis aroused suspicion. This paper is aimed to provide
direct experimental evidence of a phase transition in alanine, valine single
crystals but deny the configuration change of D- to L- enantiomers. New views
on Salam phase transition are presented to revalidate its great importance in
the origin of homochirality.
