Acylated high amylose corn starch and Wenguan fruit shell extract empower the performance improvement of Kedelan/starch packaging film

Background of Research on Biobased Composite Membrane With the continuous deepening of the concept of resource recycling, the development of biobased packaging materials has attracted industry attention. A study published in Packaging Technology and Science aimed to address the limitations of natural polysaccharide blending and starch modification. Curdlan (CD) was combined with high amylose maize starch (HAMS) to systematically investigate the effects of starch acetylation (HAMSA) and butyrylation (HAMSB) modification on membrane structure and properties. This study provides new ideas for the sustainable design of resins and films used in food packaging.

Effects of acylation modification on membrane structure and properties

The research results show that the stability of the composite system is mainly achieved through physical interactions.

. Acylation modification can inhibit the retrogradation and crystallization of starch, and regulate the microstructure of the membrane through hydrophobic interactions and steric hindrance effects. Among the two modified starches, HAMSA has the best compatibility with Corderian and can form a uniform and dense network structure. This structure endows the composite film with outstanding comprehensive performance: a tensile strength of 31.02 MPa, a fracture elongation of 237.93%, a light transmittance of 9.66% at a wavelength of 660 nm, and an oxygen transmittance of 0.85 cm ³/(m ² · 24 h · 0.1 MPa). This means that the film material not only maintains optical transparency, but also has good mechanical strength and oxygen barrier ability, which has practical significance for high oil food packaging that needs to control oxidative degradation.

Agricultural waste extract endows functional activity

To further expand the functionality of the membrane, the research team introduced the antioxidant extract (XSHE) of Xanthoceras sorbifolium husk into the CD/HAMSA system.

. Wenguan fruit shells belong to agricultural waste, and the reuse of their extracts is in line with the direction of high-value resource utilization. After adding XSHE, the resulting film showed significant antioxidant activity, with a DPPH radical scavenging rate of 93.18%, and excellent UV barrier, oil resistance, and optical transparency properties. For high oil and low moisture foods such as nuts and dried meat, packaging films that combine oxygen blocking, UV resistance, and antioxidant functions can help delay oil oxidation and quality deterioration.

Inspiration for polymer additives and packaging industry

From the perspective of polymer processing and additive application, the value of this research is reflected in multiple aspects.

. Firstly, starch acylation modification is essentially a chemical modification method for natural polymers, which changes the intermolecular hydrogen bonding and crystallization behavior by regulating the degree of hydroxyl reaction, thereby affecting the processing stability and mechanical properties of the final film. This is logically related to the role of processing stabilizers and modifying agents in the field of packaging materials, which optimizes macroscopic performance through molecular level structural regulation. Secondly, natural antioxidant components such as Wenguan fruit shell extract are directly incorporated into the membrane matrix, replacing or reducing the addition of synthetic antioxidants, providing a new option for biobased additives in active packaging. The extract also provides UV barrier function, indicating that natural polyphenolic components have multiple potential in the direction of functional additives. Furthermore, the research on using agricultural waste as raw material echoes the industry trend of recycled material utilization and recyclable design, providing a reference path for the full lifecycle sustainability of packaging materials. Overall, this work combines polysaccharide blending, starch acylation modification, and functionalization of natural extracts to construct a transparent, strong, oxygen resistant, and antioxidant biobased film. Although it is still in the research stage, its targeted application in high oil and low moisture food packaging scenarios, as well as its integrated approach to anti-oxidation, anti UV and other functions, deserve continuous attention from the packaging materials and additives industry.

Information source:Effects of Acylated High‐Amylose Maize Starch and Xanthoceras sorbifolium Husk Extract Loading on the Properties' Enhancement of Curdlan/Starch Film， Organized by Herun Chemical.