Preparation of Oxidized Starch-based Composite Films and Capsule Shells Containing Flavonoids and Polyphenols

LIU Junling; SHAO Yahui; ZHU Mengchen; GE Hanwen; XU Huanfei

doi:10.19554/j.cnki.1001-3563.2025.17.016

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Packaging Engineering ›› 2025, Vol. 46 ›› Issue (17) : 144-153. DOI: 10.19554/j.cnki.1001-3563.2025.17.016

Advanced Materials

Preparation of Oxidized Starch-based Composite Films and Capsule Shells Containing Flavonoids and Polyphenols

LIU Junling^1,*, SHAO Yahui², ZHU Mengchen³, GE Hanwen², XU Huanfei^2,*

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Abstract

The work aims to optimize the mechanical properties and antioxidant capacity of oxidized starch films by incorporating lotus root powder-based deep eutectic solvent (DES) supernatant, which contains natural flavonoid and polyphenol active components, thereby expanding its potential applications. With oxidized starch as the raw material, biodegradable biomass film materials were prepared by adding sodium carboxymethyl cellulose. Different DES systems (binary DES composed of choline chloride-ethylene glycol and ternary DES composed of choline chloride-ethylene glycol-sorbitol) were employed to extract the supernatant from lotus root powder, which was then introduced as a plasticizer and antioxidant enhancer into the film matrix. The DPPH radical scavenging rate was measured via UV-Vis spectrophotometry to screen the optimal DES formulation. The structural and functional properties of the films were analyzed by Fourier-transform infrared spectroscopy (FTIR), thermogravimetric analysis (TGA), and tensile testing. The binary DES (choline chloride-ethylene glycol) extracted lotus root powder supernatant contained total flavonoids and polyphenols up to 29.19 mg/g, with a DPPH scavenging rate of 85.53%. The optimized ternary DES (with sorbitol) further improved extraction efficiency, achieving 34.84 mg/g of total flavonoids/polyphenols and an 89.34% DPPH scavenging rate. The ternary DES-modified biomass film exhibited outstanding comprehensive performance: a DPPH scavenging rate of 41.5%, tensile strength of 5.07 MPa, and elongation at break of 295.55%. In conclusion, the lotus root powder DES supernatant effectively enhances the mechanical properties of oxidized starch films through hydrogen bonding while imparting antioxidant functionality. The ternary DES further improves film flexibility and bioactive compound loading, providing a feasible strategy for developing high-performance biodegradable biomass film materials.

Key words

oxidized starch film / deep eutectic solvent (DES) / lotus root powder / flavonoids and polyphenols

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LIU Junling, SHAO Yahui, ZHU Mengchen, GE Hanwen, XU Huanfei. Preparation of Oxidized Starch-based Composite Films and Capsule Shells Containing Flavonoids and Polyphenols[J]. Packaging Engineering. 2025, 46(17): 144-153 https://doi.org/10.19554/j.cnki.1001-3563.2025.17.016

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