Physical, mechanical, and antibacterial properties of Hibiscus sabdariffa L. extract and graphene oxide incorporated corn starch nanocomposite films,Polymer Composites

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Physical, mechanical, and antibacterial properties of Hibiscus sabdariffa L. extract and graphene oxide incorporated corn starch nanocomposite films
Polymer Composites ( IF 4.8 ) Pub Date : 2022-06-22 , DOI: 10.1002/pc.26831
Gulsum Aydin ₁ , Mualla Yildiz ₁

Affiliation

The utilization of eco-friendly and biodegradable natural biopolymers is globally expanding due to environmental problems caused by non-degradable synthetic polymers. This study examined the physical, mechanical, and antibacterial properties of corn starch-based films incorporated with Hibiscus sabdariffa L. extract (HE) and different concentrations (0.5, 1, and 1.5 wt% of starch) of graphene oxide (GO). The addition of HE and GO into the starch matrix resulted in increased thickness, moisture content, solubility, and swelling degree in the composite films. FTIR spectrum proved intermolecular interactions among starch, HE, and GO. Moreover, SEM images showed that films presented a continuous surface without cracks and bubbles, without separation of phases between starch, HE, and GO verifying the compatibility of the constituents in the film matrix. On the other hand, the addition of the plant extract and GO significantly reduced the tensile strength of the films (except the film containing 0.5% GO) and increased the percentage of elongation at break. Furthermore, all films displayed strong antibacterial activity against both the Gram-positive and Gram-negative bacteria. Obtained results suggest that the novel antibacterial starch films incorporated with HE and GO are promising to be used as wound dress or food coating.

中文翻译：

Hibiscus sabdariffa L. 提取物和氧化石墨烯掺入玉米淀粉纳米复合薄膜的物理、机械和抗菌性能

由于不可降解的合成聚合物引起的环境问题，环保和可生物降解的天然生物聚合物的使用正在全球范围内扩大。本研究检测了掺入木槿的玉米淀粉基薄膜的物理、机械和抗菌性能L. 提取物 (HE) 和不同浓度（0.5、1 和 1.5 wt% 的淀粉）的氧化石墨烯 (GO)。在淀粉基质中添加 HE 和 GO 导致复合膜的厚度、水分含量、溶解度和溶胀度增加。FTIR 光谱证明了淀粉、HE 和 GO 之间的分子间相互作用。此外，SEM 图像显示薄膜呈现连续表面，没有裂纹和气泡，淀粉、HE 和 GO 之间没有相分离，验证了薄膜基质中成分的相容性。另一方面，植物提取物和 GO 的添加显着降低了薄膜的拉伸强度（含 0.5% GO 的薄膜除外），并增加了断裂伸长率。此外，所有薄膜对革兰氏阳性菌和革兰氏阴性菌均显示出强抗菌活性。获得的结果表明，与 HE 和 GO 结合的新型抗菌淀粉薄膜有望用作伤口敷料或食品涂层。

更新日期：2022-06-22

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