Caramel Color Production Techniques

I. Classification and Processes of Mainstream Production Techniques

1. Atmospheric Pressure Method (Open Pot Cooking)

• Principle: Sugar materials (sucrose, glucose syrup, etc.) are directly heated and dehydrated in open containers for caramelization[()].
• Process:
• Heat raw sugar to a molten state (approx. 150–160°C).
• Add catalysts (e.g., ammonia water) and raise temperature to 190–200°C until reaction endpoint.
• Cool and filter to obtain liquid caramel color.
• Limitations: Unstable temperature control, product prone to sedimentation, low color intensity (typically <10,000 EBC), and significant batch variations.

2. Pressurized Method (Sealed Reactor)

• Principle: Sugar materials undergo precisely controlled reactions in stirred high-pressure reactors, categorized by catalyst type:
• Plain Process: No catalyst, suitable for baking and soy sauce applications, characterized by strong salt resistance and high red index.
• Ammonia Process: Catalyzed by ammonium salts, specialized for acidic beverages like cola, achieving high color intensity (>20,000 EBC).
• Ammonium Sulfite Process: Catalyzed by sulfites + ammonium compounds, produces high-intensity products (e.g., double-strength caramel color) with doubled color strength[()].
• Advantages:
• Precise control of reaction parameters (temperature: 130–160°C, pH, time), improving color stability by >30%.
• Gradient caramelization technology limits byproduct 4-methylimidazole content (<200mg/kg, meeting international safety limits).

3. Extrusion Method (Solid Caramel Powder)

• Process: Sugar materials are dehydrated via high-temperature (>200°C) spray grinding in screw extruders, producing powdered caramel with ≤3% moisture content.
• Innovation: Overcomes storage/transport limitations of liquid caramel, suitable for solid beverages and seasoning packets.

II. Industry Technical Challenges and Breakthroughs

• Challenges:
• High water-insoluble matter in atmospheric pressure products (>0.1%).
• High equipment costs and low industrialization rate for extrusion method[()].
• Breakthrough Directions:
• Vacuum Low-Temperature Caramelization: Reduces energy consumption by 30% at 130–160°C, elevating red index to >6.35.
• Full-Chain Digitalization: Integrated "sugar source screening-caramelization-flavor locking" system achieves standardized color/flavor synergy.