Abstract
Edible films have gradually become a research focus for food packaging materials due to a variety of benefits, including environmental friendliness, good barrier properties, and good carrying capacity. In this experimental study, we used sodium alginate as a film-forming substrate, sodium carboxymethylcellulose as a modifier, and glycerol as a plasticizer, then Lactococcus lactis was added to film solutions to form bacteriostatic films via the tape casting method. With the addition of Lactococcus lactis, the films did not significantly change thickness, while the transparency decreased and a significant increase in red and yellow hues was observed. Meanwhile, the dispersion of bacterial cells in film solutions destroyed intermolecular interactions in the solutions during film formation and increased the volume of voids in the Lactococcus lactis-containing films, thereby slightly decreasing the tensile strength of the films, but significantly increasing water vapor permeability. Moreover, the films with added Lactococcus lactis showed significant bacteriostatic activity against Staphylococcus aureus at 4 °C. In a seven-day bacteriostatic test, the films with Lactococcus lactis added at a level of 1.5 g/100 g resulted in a decrease in the viable cell count of Staphylococcus aureus by at least four logarithmic units. This study of Lactococcus lactis-containing films has provided a new method and strategy for antibacterial preservation of foods.
Highlights
The Food and Agriculture Organization of the United Nations and the World Health Organization (WHO) define probiotics as active beneficial microorganisms that colonize the human gut and reproductive system and can provide definite health benefits, thereby playing a beneficial role in improving the microecological balance of the host [1]
Studies have shown that the intake of a sufficient number of probiotics is beneficial to the health of the host, including maintaining intestinal homeostasis [2], fighting pathogenic intestinal bacteria, rebuilding intestinal flora [3], regulating the intestinal immune system, suppressing the damage of toxins in the intestine, and ensuring intestinal nutrient metabolism [4]
We propose a new idea for the bacteriostatic antimicrobial preservation storage of foods using plantarum-methylcellulose coating had a certain effect
Summary
The Food and Agriculture Organization of the United Nations and the World Health Organization (WHO) define probiotics as active beneficial microorganisms that colonize the human gut and reproductive system and can provide definite health benefits, thereby playing a beneficial role in improving the microecological balance of the host [1]. Lactic acid bacteria act as probiotics in the human body and are collectively a group of nonsporulating, Gram-positive bacteria that can produce large amounts of lactic acid in the fermentation of carbohydrates. They can regulate microbial flora in the organism, maintain microecological balance, inhibit the activity of pathogenic bacteria in the digestive tract and reduce their adhesion to the intestinal lining, and restore the physiological function of the intestines [5]. Lactic acid bacteria can enhance the barrier function of epithelial cells by stimulating intestinal epithelial cells to secrete mucin, which in turn reduces the risk of pathogenic bacterial infection [6].
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