Apple juice is rich in nutrients, including vitamins, polyphenols, and various minerals. So how is it produced? Below, we will show you the apple juice processing flow chart.
1. Raw Material Selection and Acceptance:
The quality of apple juice depends primarily on the quality of the apples used. Generally, apples with moderate ripeness, a balanced sugar-acid ratio, and free from rot and pests are selected.
2. Cleaning and sorting: Apples may accumulate dust, mud, and sand during growth, harvesting, and transportation. They need to be cleaned before processing, and food-grade disinfectant can be added for disinfection if necessary.
3. Crushing and Juicing:
After washing, the apples are conveyed by an elevator to a crusher for crushing. The purpose of crushing is to break the apples into uniform small particles to increase the juice yield. They then proceed to the juicing process, where juicing machine pressure separates the juice from the pulp.
4. Filtration and Clarification:
The extracted juice usually contains a significant amount of pulp and suspended matter, requiring filtration. Initial filtration can be done using a sieve or vibrating filter. If the product is clarified apple juice, further clarification is necessary.
5. Blending and Standardization:
The filtered apple juice needs to be adjusted in terms of composition. Depending on the product positioning, adjustments may be made to the sugar content, acidity, or an appropriate amount of vitamin C may be added to prevent oxidation and discoloration.
6. Sterilization Treatment
To ensure product safety and extend shelf life, apple juice must be sterilized. Controlling the sterilization temperature and time is crucial. Excessive temperature will destroy the natural aroma and nutrients of the apples.
7. Filling and Packaging
Pasteurized apple juice must be filled in a sterile environment. Common packaging forms include glass bottles, PET bottles, and Tetra Pak cartons.
Important Considerations During Processing
1. Preventing Oxidation and Discoloration
Apples contain polyphenol oxidase, which easily oxidizes and turns brown after being cut or crushed. Therefore, contact with air should be minimized during crushing and juicing, which can be achieved by using a closed conveyor system or adding antioxidants.
2. Temperature Control
Temperature control is crucial at every stage, from enzymatic hydrolysis to sterilization. Excessive temperature will result in flavor loss, while insufficient temperature will affect juice yield and safety.