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Published : 2021-02-17
Vol. 66 No. 2 (2021)

The effect of plasticizers and chitosan concentration on the structure and properties of Gracilaria sp.-based thin films for food packaging purpose

M. Zulham Efendi Sinaga https://orcid.org/0000-0002-7111-6081 Saharman Gea https://orcid.org/0000-0003-0615-0918 Cut Fatimah Zuhra https://orcid.org/0000-0002-5387-9085 Yuan Alfinsyah Sihombing https://orcid.org/0000-0002-7640-1738 Emma Zaidar https://orcid.org/0000-0002-8125-1201 Firman Sebayang https://orcid.org/0000-0002-4260-5142 Tya Utari Ningsih https://orcid.org/0000-0002-3157-6614
DOI: https://doi.org/10.14314/polimery.2021.2.5

Abstract

Gracilaria sp. is well known as one kind of species of red algae. The major component of polysaccharide in this alga is agar that mostly used for making thin film. In this study, the Gracilaria sp.-based thin film had been prepared using two plasticizers (glycerol and sorbitol, 0.1, 0.2, and 0.3 wt %), and chitosan (1, 2, and 3 wt %). The FT-IR analysis confirmed the interaction that happened among the component of the mixture of Gracilaria sp., plasticizers, and chitosan was based on hydrogen bonding due to the presence of -OH and -NH2 groups. The plasticizers and chitosan concentration have significant role to the mechanical properties of Gracilaria sp.-based thin film. The optimum concentration of plasticizers and chitosan based on mechanical testing result was found at 0.2 and 3.0 wt %, respectively. At those concentrations, the thin film that prepared with sorbitol showed the highest mechanical properties. Other characterizations, i.e. TGA (Thermogravimetric Analysis), SEM (Scanning Electron Microscopy), and WVP (Water Vapor Permeability) also brought the same result. The antimicrobial properties of the as prepared thin film in the presence of chitosan on agar medium and as a packaging on selected bread showed the Gracilaria sp.-based thin films was able to inhibit the growth of microbes. This antimicrobial activity can be used to declare the potential of Gracilaria sp.-based thin film as a new active food packaging.

Keywords

Gracilaria sp ; chitosan ; sorbitol ; glycerol ; active packaging Gracilaria sp ; chitozan ; sorbitol ; glicerol ; opakowania aktywne



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Zasady cytowania

Sinaga, M. Z. E., Gea, S., Zuhra, C. F., Sihombing, Y. A., Zaidar, E., Sebayang, F., & Ningsih, T. U. (2021). The effect of plasticizers and chitosan concentration on the structure and properties of Gracilaria sp.-based thin films for food packaging purpose. Polimery, 66(2). https://doi.org/10.14314/polimery.2021.2.5

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