he production and consumption of herbal beverages has increased
in recent years due to their health benefits. Pennywort
juice is one of the popular cooling drinks in this respect. To preserve
this juice, it is often subjected to heat treatment which could
certainly destroy microorganisms but which may have an undesirable
effect on nutritional and organoleptic properties. Nonthermal
methods for juice processing such as ultra-high-pressure processing
(HPP) represent highly promising technologies to supersede the
traditional thermal processes. Ultra-high pressure is frequently applied
in juice processing because it can eliminate vegetative bacteria,
yeasts, and molds with minimal damage to heat-sensitive
compounds. This method is capable of maintaining freshness and
nutritive value (Houlka and others 2006). The European Commission
has included products processed by high pressure in the group
of novel foods regulated by the Novel Foods Legislation.