Capsicum leaf protein-based bionanocomposite films for packaging application: Effect of corn starch content on film properties

Qingyu Qin; Wenying Liu; Bing Gao; Xinyan Zhang; Lujia Han; Swee Leong Sing; Xian Liu

doi:10.1016/j.foodchem.2024.139449

Capsicum leaf protein-based bionanocomposite films for packaging application: Effect of corn starch content on film properties

Food Chem. 2024 Apr 25:451:139449. doi: 10.1016/j.foodchem.2024.139449. Online ahead of print.

Authors

Qingyu Qin¹, Wenying Liu², Bing Gao³, Xinyan Zhang⁴, Lujia Han⁵, Swee Leong Sing⁶, Xian Liu⁷

Affiliations

¹ Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China; Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, Singapore. Electronic address: qingyuqin@126.com.
² Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China. Electronic address: wenyingliu888@126.com.
³ Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China. Electronic address: gaobing_2022@126.com.
⁴ National Engineering Laboratory for Reducing Emissions from Coal Combustion, School of Energy and Power Engineering, Shandong University, Jinan, Shandong 250061, China. Electronic address: sddxzxy2020@sdu.edu.cn.
⁵ Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China. Electronic address: hanlj@cau.edu.cn.
⁶ Department of Mechanical Engineering, College of Design and Engineering, National University of Singapore, Singapore. Electronic address: sweeleong.sing@nus.edu.sg.
⁷ Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China. Electronic address: lx@cau.edu.cn.

PMID: 38678654
DOI: 10.1016/j.foodchem.2024.139449

Abstract

The addition of corn starch (CS) enhances the interfacial adhesion of the film-forming liquids (FFLs), weakening the internal relative molecular motion. As a result, the rheological properties and zeta potential values of the FFLs were affected. A tight spatial network structure between capsicum leaf protein (CLP), lignocellulose nanocrystals (LNCs) and CS can be formed through intermolecular entanglement and hydrogen bonding interactions. The crystallinity, thermal degradation temperature, tensile strength and water contact angle of the protein-based bionanocomposite films (PBBFs) increased with increasing CS addition. This is due to the transformation of the secondary space structure of the CLP inside the PBBFs and the increase in cohesion. However, the excessive addition of CS forms aggregated clusters on the surface of PBBFs, which increases the surface roughness of PBBFs and causes more light scattering. Therefore, the brightness and yellowness values of the PBBFs increase, and the transmittance decreases.

Keywords: Capsicum leaf protein; Corn starch; Nanocellulose; Solution casting method.