Hydrolyzed vegetable protein (HVP) has been used
for >100 years to impart meatlike flavor to prepared
foods and represents one of the earliest forms of process
flavor (1). HVP is primarily composed of amino acids
liberated by the hydrolysis of vegetable protein with HCl
at 110-140 °C. Enzyme-hydrolyzed vegetable protein
(E-HVP), which is an alternative to the traditional HVP,
is produced using proteases under a more neutral pH
and lower temperature. These two types of HVP have
different sensory profiles due to the differences of the
contents of free amino acids and the composition of
volatile components (2).