suojakaasupakkausta

Suojakaasupakkaus, often referred to as modified atmosphere packaging (MAP) or protective atmosphere packaging, is a food preservation technique. It involves altering the gaseous atmosphere inside a package to extend the shelf life of perishable products. Typically, air, which is composed of approximately 78% nitrogen, 21% oxygen, and 1% carbon dioxide, is replaced with a specific mixture of gases.

The gases commonly used in MAP are nitrogen, carbon dioxide, and oxygen, though the exact composition varies depending on the food product. Nitrogen is often used as a filler gas because it is inert and displaces oxygen, which contributes to spoilage and the growth of aerobic bacteria. Carbon dioxide is a key component as it actively inhibits the growth of many microorganisms, including bacteria and molds, and also slows down enzymatic and chemical reactions that degrade food quality. Oxygen, when present in controlled amounts, can be beneficial for respiring products like fresh produce, helping to maintain their color and vitality, but its absence is crucial for preventing the growth of spoilage organisms in many other foods.

The process involves flushing the package with the desired gas mixture before sealing it. This controlled atmosphere slows down the natural deterioration processes, such as oxidation, microbial growth, and enzymatic activity, leading to a significantly extended shelf life compared to traditional packaging. MAP is widely used for a variety of food items, including fresh meats, poultry, fish, baked goods, salads, and pasta, helping to maintain their freshness, color, texture, and nutritional value for longer periods.