Food Preservation

Gases like carbon dioxide and nitrogen displace oxygen or create inhospitable environments for spoilage-causing bacteria, yeast, and mold, while oxygen is used to maintain freshness in specific products like red meat and produce. This gas-based approach slows oxidation, reduces dehydration, and helps foods retain their color, texture, and flavor for longer periods.

Using industrial gases extends shelf life, reduces food waste and spoilage-related losses, and minimizes the need for chemical preservatives, resulting in cleaner label products. It also improves food safety by suppressing pathogenic and spoilage organisms, while helping processors and distributors maintain product quality across longer supply chains.

Carbon dioxide is bacteriostatic and fungistatic, meaning it suppresses the growth of aerobic bacteria and molds that cause spoilage. It’s commonly used in modified atmosphere packaging for meats, poultry, cheese, and baked goods, and can also be used as dry ice for cold chain shipping and temperature-sensitive transport.

Nitrogen is an inert gas that displaces oxygen inside packaging to prevent oxidation, rancidity, and the growth of aerobic microorganisms. It’s frequently used to preserve snack foods, nuts, coffee, and dried goods where maintaining crispness and preventing staleness is critical.

While often minimized in preservation applications, oxygen is intentionally included in specific gas mixtures for fresh red meat to maintain its bright red color through myoglobin oxygenation. Controlled oxygen levels also support the natural respiration process in some fresh fruits and vegetables to slow over-ripening.

Fresh meat typically uses a high-oxygen blend combined with carbon dioxide to preserve color while inhibiting bacterial growth, while poultry and seafood rely more heavily on carbon dioxide and nitrogen mixtures to control spoilage organisms. Baked goods, snacks, and dried foods generally use nitrogen alone or nitrogen-rich blends to prevent mold growth and oxidative rancidity.

Facilities using high volumes of nitrogen or carbon dioxide should ensure adequate ventilation, since both gases can displace oxygen in enclosed spaces and create asphyxiation hazards for workers. Proper gas monitoring, employee training, and food-grade certification of all supply lines and equipment are essential for maintaining both worker safety and product integrity.