Product name: ε-polylysine hydrochloride ε-Polylysine hydrochloride (ε-PLhcl) is a homopolymer composed of 25-35 L-lysine residues produced by fermentation of Streptomyces albulus. It has broad-spectrum antibacterial activity against gram-positive and gram-negative bacteria, yeast, and fungi. It is heat-stable, water-soluble, and widely used in various food products. It can be digested and absorbed by the human body, and is broken down into essential L-lysine without any side effects. Efficient and broad-spectrum antibacterial agent, with good inhibitory effect on gram-positive and gram-negative bacteria, fungi, yeast, and viruses. Good thermal stability. Works well in the pH range of 3-9, suitable for most foods. Water-soluble, with a clear solution and no odor, convenient to use without affecting the original color and flavor of the food. High safety, can be degraded into essential L-lysine in the body after consumption, without any toxic side effects.ε-polylysine hydrochloride (ε-PLhcl) is a unique and effective antibacterial agent that has gained increasing attention in the food industry. It is a homopolymer composed of 25-35 L-lysine residues produced by fermentation of Streptomyces albulus. This article aims to provide a comprehensive introduction to ε-PLhcl, including its properties, applications, and future prospects.