Optimized Technology For Preparing Antibacterial Film With Edible Potato Starch

With potato starch as main material,film making process and effects of different conditions on the properties of the antibacterial film were analyzed.The technological conditions of the edible potato starch film formation were optimized and the inhibitory effect of nisin on the common food-borne bacteria was discussed.The inhibitory effect of antibacterial film with edible potato starch on the common food borne bacteria(staphylococcus aureus,wax bacillus,single liszt fungus)was discussed:1.The effect of the potato starch addition on membrane properties was determined.After adding the potato starch,the tensile strength of the starch antibacterial film increased.The optimum adding amount was 9g/100 ml.Under this condition,the tensile strength of the film was 49.65 MPa,the elongation of the film was 27.6 percent,the water-solubility of the film was 26.2 percent,the opacity of the film was 79.8 percent.2.The effect of the glycerin addition on membrane properties was determined.After adding the glycerin,the elongation of the starch antibacterial film increased.The film becomes soft and elastic.The optimum adding amount was 6 g/100 ml.Under this condition,the tensile strength of the film was 37.22 MPa,the elongation of the film was 30.1 percent,the water-solubility of the film was 30.1 percent,the opacity of the film was 81.2 percent.3.The effect of the sodium alginate addition on membrane properties was determined.After adding the sodium alginate,the tensile strength of the starch antibacterial film increased.The optimum adding amount 0.6 g/100 ml.Under this condition,the tensile strength of the film was 50.73 MPa,the elongation of the film was 27.6 percent,the opacity of the film was 79.6 percent,the water-solubility of the film was 31.5 percent.4.The optimum technological conditions of potato starch inhibition membrane were determined as follows by orthogonal test optimization: potato starch content 9 g/100 ml,the glycerin adding amount 6 g/100 ml,the sodium alginate adding amount 0.6g/100 ml.And the nisin adding amount 0.05g/100 ml.Under this condition,the tensile strength of the film was 45.86 MPa,the elongation of the film was 31.6 percent,the water-solubility of the film was 31.7 percent,the opacity of the film was 80.2 percent.5.The effect of the antibacterial addition on membrane was determined.With staphylococcus aureus,wax bacillus,single liszt fungus as test objects.It was found to inhibit the harmful microorganisms.As the addition of nisin increased,the effect of the bacteria increased.The optimum adding amount was 0.1g/100 ml.