Photodynamic sterilization method for acidic foods

Abstract

The invention discloses a photodynamic cold sterilization method for acidic foods. The method comprises the following steps: firstly preparing a stock solution with a high concentration of >=800 mg / kgfrom an erythrosine photosensitizer, adding the stock solution into the acidic foods according to a dose of <45 mg / kg, performing uniform distribution, finally putting the acidic foods mixed with theerythrosine photosensitizer solution under a visible light source for irradiation, and performing immediate sealed package. The method provided by the invention has mild sterilization conditions andlow costs, does not destroy nutrient substances and flavor in the acid foods (because of cold sterilization technology), and has a good sterilization effect after light irradiation, the inactivation rate of microorganisms in the treated products are all >90%, and the method prolongs the shelf life (>15 days), has no toxic effects on human bodies, and is a novel safe, efficient low-cost and easy-to-operate sterilization method.

Description

technical field [0001] The invention belongs to the technical field of food processing, and in particular relates to a photodynamic sterilization method for acidic food. Background technique [0002] With the improvement of people's living standards and the increasing health problems related to diet, more and more people pay more attention to the nutritional value of food while pursuing the taste. Acidic foods (fruit and vegetable products, such as fruit and vegetable juices, pickles, etc.) are favored by people because of their good taste and high nutritional value, and their sales are also increasing year by year. [0003] As food to be sold on the shelves requires a certain period of sales, it needs to be sterilized during the production process. Traditional sterilization methods are mainly thermal sterilization (such as pasteurization and ultra-high temperature sterilization), that is, heat treatment methods that use steam and hot water as heat transfer media to transfe...

AI Technical Summary

Problems solved by technology

[0005] Since photodynamic sterilization is a method of inactivating microorganisms by using photosensitizer molecules to absorb specific wavelengths of light to generate reactive oxygen species (ROS) with high oxidative capacity, photosensitizers are one of the key factors for photodynamic antibacterial. Currently, researchers The developed photosensitizers (Yang, Su-Geun, Biomaterials Research 2018, 22(1), 25) are mainly used in the fields of clinical cancer treatment or inflammation treatment. These photosensitizers usually have certain toxicity and cannot be used in the food field

In addition, most photosensitizers are easy to lose antibacterial activity under acidic conditions due to the protonation sites such as N and O, which limits their application in acidic foods.

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