Beverage sterilization methods can be broadly categorized into heat sterilization and cold sterilization, based on whether heating is involved. The core principle is to inactivate microorganisms using different technologies to ensure beverage safety and shelf life.
I. Heat Sterilization
Heat sterilization is the most traditional and widely used method in the beverage industry. It destroys the enzyme systems and cell structures of microorganisms through high temperatures.
1. Pasteurization
◦ Key Features: Low-temperature, long-time (LTLT, e.g., 62.8℃/30min) or high-temperature, short-time (HTST, e.g., 72℃/15s) processing
◦ Suitable for: Fresh milk, juice, beer, and other heat-sensitive beverages, preserving more flavor and nutrients.
2. Ultra-High Temperature (UHT) Sterilization
◦ Key Features: Holds at 135-150℃ for 2-8 seconds, completely killing microorganisms and spores.
◦ Suitable for: Room-temperature milk, Tetra Pak packaged juice, tea beverages, etc., enabling long-term storage at room temperature.
3. Atmospheric Pressure Sterilization
◦ Key Features: Sterilization with boiling water or steam below 100℃, simple equipment.
◦ Suitable for: Acidic beverages packaged in glass bottles (e.g., carbonated drinks, juice).
4. Autoclaving
◦ Key Features: High-pressure steam sterilization at 121-135℃, thorough sterilization.
◦ Applicable Scenarios: Low-acid beverages, complex beverages containing particles
II. Cold Sterilization
Cold sterilization does not require high temperatures, thus preserving the nutritional components and original flavor of beverages to the greatest extent. It is a sterilization technology that has developed rapidly in recent years.
1. High Pressure Processing (HPP)
◦ Core Feature: Applying high pressure (100-600 MPa) at room temperature to destroy the cell structure of microorganisms.
◦ Applicable Scenarios: Fruit juices, vegetable juices, dairy beverages, etc., preserving fresh taste.
2. Ultraviolet (UV) Sterilization
◦ Core Feature: Utilizing 254nm ultraviolet light to destroy the DNA of microorganisms.
◦ Applicable Scenarios: Bottled water, purified water, and other transparent beverages, where UV penetration must be ensured.
3. Ozone Sterilization
◦ Core Feature: Ozone has strong oxidizing properties, rapidly killing bacteria and viruses.
◦ Applicable Scenarios: Pre-treatment of drinking water and fruit juices, where residual levels must be controlled.
4. Pulsed Electric Field (PEF) Sterilization
◦ Core Feature: Utilizing a high-voltage pulsed electric field to destroy the cell membrane of microorganisms.
◦ Applicable Scenarios: Liquid foods such as juices and milk beverages, suitable for continuous production.
III. Other Sterilization Methods
1. Microwave Sterilization
◦ Core Features: Sterilization through the combined thermal and non-thermal effects of microwaves
◦ Applicable Scenarios: Beverages containing particles, eight-treasure porridge, etc.
2. Irradiation Sterilization
◦ Core Features: Killing microorganisms using ionizing radiation such as gamma rays and electron beams
◦ Applicable Scenarios: Packaged beverage products that must meet national irradiation food standards