HPJ Processing (High-Pressure Processing)

High-Pressure Processing (HPP or HPJ) is a non-thermal food and beverage preservation technology that uses hydrostatic pressure (300–600 MPa) to inactivate pathogens and spoilage organisms without heat, preserving fresh flavor, nutritional content, and bioactive compounds.

HPP subjects packaged liquid to extreme isostatic pressure — equivalent to 5–6 times the pressure at the deepest ocean trench — for 1–6 minutes. This pressure disrupts microbial cell walls and denatures proteins responsible for spoilage, achieving pasteurization-equivalent microbial safety without the heat that destroys heat-sensitive vitamins, enzymes, and aromatics. The technology was originally developed for food (juices, deli meats, guacamole) and has found growing application in premium beverage production.

For zero-proof beverages, HPP is particularly valuable for raw fermented drinks (unpasteurized kombucha, water kefir, jun tea) and cold-pressed botanical extracts that would otherwise require heat pasteurization to achieve commercial shelf life. By using HPP instead of heat, producers can label their products as 'raw,' 'unpasteurized,' and 'live,' which aligns with functional wellness positioning and commands premium pricing.

A notable limitation of HPP: it does not inactivate all enzymes, meaning enzymatic browning and flavor changes can still occur in HPP-treated products, particularly those containing polyphenol oxidase (common in apple and grape-based drinks). Producers must manage pH, oxygen exclusion, and refrigerated supply chains in addition to HPP treatment to ensure consistent product quality.

HPP has also shown promise for a specific application unique to the zero-proof world: stabilizing dealcoholized wines and kombuchas that contain live cultures or residual yeast, enabling them to be sold without sulfites or other chemical preservatives — a significant commercial advantage in the organic, natural, and biodynamic segment of the zero-proof wine market.