Effect of addition of pullulan on the properties of native/waxy corn starch‐based films

Hao Cheng, Long Chen, Zipei Zhang, Ruojie Zhang, D. Mcclements, Hao Xu, Zhenlin Xu, Man Meng, Zhen Jin
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Abstract

This article reports on the preparation of native/waxy corn starch (NCS/WCS)‐based films with the addition of pullulan (PUL). Our study investigated the effects of varying amounts of PUL and amylose contents on the structure, mechanical and physicochemical properties of corn starch films. Notably, it was observed that WCS films with low amylose content exhibited superior transparency, while NCS films with high amylose content demonstrated enhanced tensile strength (up to 7.35 ± 0.18 MPa). Fourier transform infrared spectroscopy (FTIR) analysis indicated that the addition of PUL did not change the molecular interactions within the corn starch films. The X‐ray diffraction (XRD) results supported that the WCS films were amorphous, while the NCS film exhibited B‐type and V‐type crystals. Moreover, an increase in PUL content led to a gradual reduction in the crystallinity of both WCS films and NCS films. The addition of PUL improved the mechanical properties and oxygen barrier characteristics of these films but had an adverse impact on their water vapor barrier properties. These findings offer valuable insights for the selection of additives for corn starch film, which can further enhance the practical application potential of corn starch films in food and other industries.
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添加拉鲁兰对原生/蜡质玉米淀粉薄膜性能的影响
本文报道了添加普鲁兰(PUL)制备天然/蜡质玉米淀粉(NCS/WCS)基薄膜。研究了不同用量的PUL和直链淀粉含量对玉米淀粉膜结构、力学和理化性质的影响。值得注意的是,直链淀粉含量低的WCS薄膜具有更好的透明度,而直链淀粉含量高的NCS薄膜具有更高的抗拉强度(高达7.35±0.18 MPa)。傅里叶变换红外光谱(FTIR)分析表明,PUL的加入没有改变玉米淀粉膜内的分子相互作用。X射线衍射(XRD)结果表明WCS薄膜是无定形的,而NCS薄膜则表现为B型和V型晶体。此外,PUL含量的增加导致WCS薄膜和NCS薄膜的结晶度逐渐降低。PUL的加入改善了膜的力学性能和氧阻隔性能,但对膜的水蒸气阻隔性能有不利影响。这些研究结果为玉米淀粉膜添加剂的选择提供了有价值的见解,可以进一步增强玉米淀粉膜在食品等行业的实际应用潜力。
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