Effect of Chitosan on Properties of Edible Corn Starch Films

doi:10.19491/j.issn.1001-9278.2021.04.007

Abstract

Abstract:

Chitosan/corn starch composite edible films were prepared by a solution-casting method using corn starch as a raw material in the presence of plasticizer glycerin. Their membrane structure and microscopic morphology were characterized using Fourier-transform infrared spectroscopy and scanning electron microscopy. The effects of chitosan content on the mechanical properties， water vapor permeability， oil resistance and antibacterial properties of the resultant films were investigated. The results indicated that chitosan not only improved the mechanical properties of the films but also enhanced their water-proof and oil-proof properties. The membrane obtained at a chitosan/starch mass ratio of 1/3 exhibited a uniform structure， and it tensile strength and water vapor transmission rate reached 21.54 MPa and 4.52×10^-5 g·mm^-1·d^-1， respectively. The membranes could inhibit the growth of Escherichia coli and Staphylococcus aureus， with antibacterial rates of 43.55 % and 32.89 %， respectively.

Key words: chitosan, corn starch, antibacterial behavior, physical property

CLC Number:

O 636.1⁺2

CHENG Long, HAO Yanling, SONG Xiaoshuang. Effect of Chitosan on Properties of Edible Corn Starch Films[J]. China Plastics, 2021, 35(4): 35-41.

Figures/Tables 9

样品编号

壳聚糖质量/g

淀粉与壳聚糖质量比

CS?C6/1

CS?C5/1

CS?C4/1

CS?C3/1

CS?C2/1

0.50

0.60

0.75

1.00

1.50

3∶0

6∶1

5∶1

4∶1

3∶1

2∶1

Tab.1. Sample symbols

Fig.1. SEM of the surfaces of the films

Fig.2. SEM of the cross?sections of the films

Fig.3. FTIR spectra of the films

Fig.4. Tensile strength and elongation at break of the films

Fig.5. Water vapour transmittance of the films

Fig.6. Oil permeability coefficients of the films

Fig.7. Bacteriostatic ring in the films

Fig.8. Bacteriostatic activity of the films

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