Characterization of bio-nanocomposite films based on gelatin/polyvinyl alcohol blend reinforced with bacterial cellulose nanowhiskers for food packaging applications
Characterization of bio-nanocomposite films based on gelatin/polyvinyl alcohol blend reinforced with bacterial cellulose nanowhiskers for food packaging applications
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DOI：
10.1016/j.foodhyd.2020.106454
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发表时间：
2021-01-17
影响因子：
10.7
通讯作者：
Pulvirenti, Andrea
中科院分区：
文献类型：
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作者：
Haghighi, Hossein;Gullo, Maria;Pulvirenti, Andrea
采用硫酸水解法从木杆菌Komagataeibacter xylinus（K2 G30; UMCC 2756）中合成细菌纤维素纳米晶须（BCNW），并将其掺入明胶-聚乙烯醇（GL/PVA）共混膜基质中。研究了BCNW含量（生物聚合物的1- 10wt%）对生物纳米复合材料的微观结构、力学、光学和水阻隔性能的影响。透射电子显微镜显示BCNW具有平均长度为600 nm、平均宽度为30 nm的针状形貌。用X射线衍射法测得BCNW的结晶度为94.7%。扫描电子显微镜（SEM）显示GL/PVA共混膜基质和BCNW之间的良好相容性高达7.5wt%。傅里叶变换红外光谱在衰减全反射模式显示GL/PVA共混膜基质和BCNW的官能团之间的分子相互作用。当BCNW的加入量达到7.5%时，GL/PVA共混物的水蒸气透过率和水蒸气透过率分别降低了约22%和14%，而拉伸强度、断裂伸长率和弹性模量分别增加了约21.5%、41%和19%（p < 0.05）。BCNW的加入对膜的透明度没有影响（p > 0.05），表明BCNW在纳米尺度上均匀分散。所有的膜都是无色的（Δ E*
Bacterial cellulose nanowhiskers (BCNW) were synthesized from Komagataeibacter xylinus (strain K2G30; UMCC 2756) using sulfuric acid hydrolysis and incorporated into a gelatin-polyvinyl alcohol (GL/PVA) blend film matrix. The effect of BCNW content (1-10 wt% of biopolymer) on the microstructural, mechanical, optical, and water barrier properties of bio-nanocomposites was studied. Transmission electron microscopy showed that BCNW had a needle shape morphology with an average length of 600 nm and an average width of 30 nm. The crystallinity index of BCNW was 94.7% using X-ray diffraction. Scanning electron microscopy (SEM) illustrated good miscibility between GL/PVA blend film matrix and BCNW up to 7.5 wt%. Fourier-transform infrared spectroscopy in the attenuated total reflection mode showed molecular interactions between functional groups of the GL/PVA blend film matrix and BCNW. The incorporation of BCNW up to 7.5% into the GL/PVA blend reduced the water vapor transmission rate and water vapor permeability by about 22% and 14%, respectively, while tensile strength, elongation at break, and elastic modulus increased by about 21.5%, 41% and 19%, respectively (p < 0.05). Films transparency was not affected by the addition of BCNW (p > 0.05) suggesting that the BCNW were dispersed uniformly at the nanoscale. All films were colorless (Delta E*