2.2 HACCP Principles 1 to 3: Hazard Analysis, CCPs, & Critical Limits

2.2 HACCP Principles 1 to 3: Hazard Analysis, CCPs, & Critical Limits

Understanding the HACCP Framework

The Hazard Analysis Critical Control Point (HACCP) system is a preventative, science-based management system designed to protect food from biological, chemical, and physical hazards. Unlike reactive traditional inspections that rely on testing final products to find defects, HACCP identifies potential hazards during design and preparation, establishing controls to prevent food safety issues from occurring. Developed originally for the space program to ensure safe food for astronauts, HACCP is now mandated globally for high-risk food businesses, including food manufacturing, hotels, and large catering operations in Dubai.

A successful HACCP system relies on a multi-disciplinary HACCP team led by a trained coordinator, who is typically the Person in Charge (PIC). Before the first principle is applied, the team must complete five preliminary steps: assemble the HACCP team, describe the food product, identify the intended use and consumer, construct a process flow diagram, and conduct on-site verification of the flow diagram. Once verified, the team proceeds to the seven core principles of HACCP.

Principle 1: Conduct a Hazard Analysis

The first principle of HACCP is to identify and analyze potential hazards associated with every stage of the food flow, from receiving to service. A hazard is defined as any biological, chemical, or physical agent in, or condition of, food that is likely to cause illness or injury if not controlled.

Types of Hazards

• Biological Hazards: These are the most common cause of foodborne outbreaks. They include pathogenic bacteria (such as Salmonella, Listeria monocytogenes, Escherichia coli O157:H7, and Clostridium botulinum), viruses (like Norovirus and Hepatitis A), and parasites (such as Anisakis).
• Chemical Hazards: These include substances that can cause acute poisoning or long-term health issues. Examples include cleaning chemicals, sanitizers, pesticide residues, toxic metals leaching from non-food-grade cookware (like copper or lead), and natural toxins (histamine in spoiled fish). Under Dubai Municipality guidelines, food allergens are also classified as chemical hazards. The major food allergens (such as milk, eggs, peanuts, tree nuts, wheat, soy, fish, shellfish, sesame, and mustard) must be managed to prevent cross-contact.
• Physical Hazards: These are foreign objects that can cause physical damage, choking, or dental injury. Common physical hazards include glass fragments, metal shavings from can openers, stones from raw grains, wood splinters from pallets, and personal items like jewelry.

During the hazard analysis, the HACCP team conducts a two-stage evaluation:

1. Hazard Identification: Brainstorming what could go wrong at each process step.
2. Hazard Evaluation: Assessing each identified hazard based on its severity (how serious the illness or injury could be) and its likelihood of occurrence. Hazards that are both severe and highly likely are deemed "significant" and must be controlled by the system.

Principle 2: Determine Critical Control Points (CCPs)

Once the significant hazards are identified, the team must determine where they will be controlled. A Critical Control Point (CCP) is a specific step in the food process at which control can be applied and is essential to prevent or eliminate a food safety hazard or reduce it to an acceptable level.

It is vital to distinguish between a CCP and a Control Point (CP). A CP is any step where biological, physical, or chemical factors can be controlled, but a loss of control does not lead to an unacceptable health risk. For example, washing vegetables to remove dirt is a Control Point, but cooking raw ground beef to destroy pathogenic bacteria is a Critical Control Point.

To identify CCPs, the HACCP team typically uses a CCP Decision Tree, which asks a series of standardized questions:

1. Question 1: Do control preventive measures exist for the identified hazard?
2. Question 2: Is this step specifically designed to eliminate or reduce the likely occurrence of the hazard to an acceptable level? (If yes, this step is a CCP).
3. Question 3: Could contamination with identified hazards occur in excess of acceptable levels or increase to unacceptable levels? (If yes, proceed. If no, this step is not a CCP).
4. Question 4: Will a subsequent step eliminate or reduce the hazard to acceptable levels? (If yes, this step is not a CCP. If no, this step is a CCP).

Principle 3: Establish Critical Limits

For each identified CCP, the team must establish a Critical Limit. A critical limit is a scientifically validated, measurable boundary that separates acceptable (safe) from unacceptable (unsafe) conditions. If a process deviates from the critical limit, the food safety system has been breached, and immediate corrective action must be taken.

Critical limits must be objective and easily measurable during operation. Typical parameters include temperature, time, pH, water activity, and sanitizer concentration.

Science-Based Regulatory Standards

Critical limits must be based on scientific evidence or regulatory guidelines.

Critical Limits vs. Operating Limits

The PIC must understand the difference between a critical limit and an operating limit. An operating limit is a target value set tighter than the critical limit to prevent the process from drifting close to a deviation. For example, if the critical limit for cooking chicken is 75°C, a chef might set an operating limit of 78°C. This provides a safety buffer, allowing the kitchen to adjust the oven heat before a true critical limit deviation occurs.