Overview of pulsed light sterilization technology
Pulsed light is a new cold sterilization technology, which uses instantaneous, high-intensity pulsed light energy to kill all kinds of microorganisms on food and packaging. It is a non-thermal, high sterilization efficiency, non-toxic by-products, easy to control sterilization technology.
Pulsed strong light is the full spectrum of pulsed flashing (200-1100nm) "sunlight", is a synergistic effect of visible light, infrared and ultraviolet light on microorganisms, can destroy the cell wall and nucleic acid structure of microorganisms, thereby killing microorganisms.
Pulsed light has obvious bactericidal effect on mold, Gram-positive pathogenic bacteria, Gram-negative pathogenic bacteria, aerobic bacterial spores and fungal conidia, Staphylococcus aureus, Bacillus subtilis, yeast, etc. The bactericidal mechanism is mainly photochemical and photothermal effects.
Photothermal effect refers to the light energy is absorbed by the material will produce temperature rise. When microorganisms are irradiated by pulsed strong light at close range, the surface temperature of the microorganisms will rise sharply due to the absorption of a large amount of light energy in a short period of time, and the surface structure will be completely destroyed and die. Due to the very short process of photothermal action, the irradiated objects will not produce temperature rise and will not affect nutrients. According to the photothermal sterilization mechanism, pulsed strong light can kill all microorganisms very effectively.
Photochemical action refers to the optical reaction of microorganisms when they are irradiated with light of a specific wavelength. The double helix genetic information in microorganisms, when exposed to ultraviolet light, forms some of the isomers of diazobenzene and diazobenzene. This substance will make the microbial metabolism of their own obstacles, and will lead to the genetic problems of microorganisms, until death. Photochemical action is the main sterilization mechanism of traditional ultraviolet light. Since the pulsed intense light also covers the ultraviolet band, the pulsed intense light also has a photochemical sterilization mechanism. However, this mechanism only plays an auxiliary role in pulsed light. For fungi and spores, ultraviolet rays are difficult to penetrate the dense cell wall structure, and DNA substances cannot absorb ultraviolet rays, so the sterilization efficiency is very low.
Application advantages of pulsed light
Instant-on stop Parameters can be adjusted according to the requirements of use
Sterilization, testing Can be done by equipment only (1-2S)
Efficient Sterilization Rapid detection
No mercury/no by-products/ No chemical residues/no wastewater and emissions
Exclusive customization according to user needs Higher adaptability
光化作用指微生物接受特定波长的光照射时所产生 的光学反应。微生物中的双螺旋遗传信息在接受紫 外光照射时，会形成部分间二氮杂苯和间二氮杂苯 的异构体。这种物质会使微生物自身的新陈代谢机 能出现障碍，并且会导致微生物的遗传性出现问题， 直至死亡。光化作用是传统紫外线的主要杀菌机理。 由于脉冲强光也涵盖了紫外波段，因此脉冲强光也 具有光化杀菌机理。但该机理在脉冲强光中仅起到 辅助作用，对于霉菌类、芽孢类微生物，紫外线由 于很难穿透致密的细胞壁结构，DNA物质无法吸收紫 外线，因而杀菌效率很低。