Imported High Quality Nisin,Property Advantage

Nisin has excellent acid and heat resistance properties. The following is a detailed analysis of its performance:

1. Acid Resistance

Nisin is highly stable under acidic conditions. When the pH of the solution is low, such as at pH 2 or 2.5, it maintains a high level of stability. Specifically, its solubility at pH 2.5 is 12%, and it exhibits outstanding heat resistance in an acidic environment. Furthermore, it can withstand high-temperature treatment (121°C for 15 minutes) at pH 3.0. This demonstrates that nisin has good heat resistance under acidic conditions.

2. Heat Resistance

The heat resistance of nisin is closely related to the pH of the solution. Under acidic conditions, such as in dilute hydrochloric acid with a pH of 3, it can retain 100% of its activity even after high-temperature treatment at 121°C for 15 minutes. However, as the pH increases, its heat resistance decreases. For example, when dissolved in skim milk with a pH of 6.5, nisin loses only 15% of its activity after pasteurization at 85°C for 15 minutes. At higher pH values, its heat resistance diminishes further.

The acid and heat resistance of nisin makes it highly promising for applications in the food industry. It can be added as a preservative to various food products, such as meat products, dairy products, jams, beverages, and canned goods, to inhibit the growth and reproduction of Gram-positive bacteria. This extends the shelf life of food and helps maintain its freshness. Moreover, as a natural preservative, nisin is safer and non-toxic compared to chemical preservatives, and it poses no side effects to the human body.

The outstanding acid and heat resistance of nisin give it unique advantages and broad application prospects in the field of food preservation.