APPLICATION OF COLD PLASMA TECHNOLOGY FOR MICROBIAL DECONTAMINATION IN FOOD PROCESSING AND PRESERVATION

Аннотация

Cold plasma (CP) technology is emerging as a novel non-thermal technique for ensuring microbial safety and extending the shelf life of various food products. This article explores the application of cold plasma in food processing, especially focusing on microbial decontamination without compromising the nutritional and sensory qualities of food. Drawing from academic research and practical applications, this paper discusses the mechanisms, efficacy, and limitations of cold plasma treatment and its integration into post-harvest handling, packaging, and storagepractices. Key words: Cold plasma, microbial decontamination, food safety, non-thermal processing, food preservation, plasma-activated water. Introduction:With rising consumer demand for safer, minimally processed foods, non-thermal technologies such as cold plasma have gained significant attention in food science and biotechnology. Unlike traditional thermal methods, CP can inactivate microorganisms at ambient temperatures, thereby preserving nutrients, flavors, and textures. This paper investigates the scope of CP as a viable technique for ensuring microbial safety in food products during processing and storage. Literature Review: Several studies have reported the antimicrobial potential of cold plasma treatment on a wide range of food matrices, including fruits, vegetables, meats, and dairy products. Researchers such as Niemira (2012) and Misra et al. (2014) demonstrated that CP could reduce microbial loads by over 5 log units in minutes. Key plasma species such as ozone, NOx, and hydroxyl radicals are central to microbial inactivation mechanisms. These findings form thebasis ofmodern CPsystem design for commercial applications. Theoretical Framework: Cold plasma is generated by ionizing a gas (commonly air, argon, or helium) under ambient conditions, producing a reactive gas mixture containing electrons, ions, and radicals. The antimicrobial effects are attributed to oxidative stress induced by reactive oxygen and nitrogen species (RONS), which damage microbial cell walls, DNA, and metabolic pathways. This study builds upon the principles of plasma physics and microbiology to assess CP's efficacy and optimization. Methodology: The study relies on a qualitative meta-analysis of existing experimental research articles, technical reports, and case studies published between 2010 and 2024. Selected sources focus on food-relevant applications of cold plasma, particularly those evaluating microbial reduction rates, treatment times, gas types, and post-treatment quality attributes. The analysis also includes comparisons with conventional decontamination methods. Results: Numerous studies demonstrate that cold plasma effectively decontaminates surfaces andraw materials, including: 87 INTERNATIONAL JOURNAL OF ARTIFICIAL INTELLIGENCE ISSN:2692-5206,ImpactFactor:12,23 AmericanAcademicpublishers,volume05,issue08,2025 Journal: https://www.academicpublishers.org/journals/index.php/ijai Fruits and Vegetables: CP treatment for 2–5 minutes using atmospheric air plasma reduced E. coliand Salmonellacounts onstrawberries, apples, and lettuce by3–6log CFU/g. Meat and Seafood: Cold plasma showed substantial microbial reductions on chicken breast, beefslices, and shrimp withoutaltering sensory attributes. Dried and Ready-to-Eat Products: Low-moisture foods benefit from CP's surface activity, which is ideal fordried fruit, nuts, and spices where heat may degrade quality. In all cases, plasma gas composition and exposure time critically affect both microbial inactivation and product quality. For instance, oxygen-rich plasmas tend to generate more ozone and are more effective against Gram-negative bacteria. However, longer treatment may causesurface discoloration or lipid oxidation, especiallyinfatty products. Industrial Applications: Cold plasma devices such as dielectric barrier discharge (DBD) and plasma jets are now commercially available for food industry integration. Major use cases include: Packaging sterilization Surface treatment ofproduce Plasma-activated water (PAW)for washing and rinsing Some fruit and vegetable processors in Europe and Asia have begun adopting CP as a final decontamination step priortopackaging. Safety and Regulatory Considerations: The U.S. FDA and European Food Safety Authority (EFSA) currently allow CP-treated foods under specific conditions, provided that no harmful residues or chemical transformations occur. The safety of CP relies on its controlled usage and the absence of toxic byproducts. Long-term studies show that CP does not significantly alter vitaminsorproteins in most cases. Advantages andLimitations: Advantages: No heat damage to products High microbial reduction rates Environmentallyfriendly (no water or chemicals required) Applicableto a widerange offoods Limitations: Surface-only treatment (not suitableforinternal contamination) Requires optimization foreach food type High initial investment forequipment Possibleoxidativedamage