Grafting of PHGH on lignin improves the antibacterial activity and the usage as an additive of starch film

IF 8.5 1区农林科学 Q1 FOOD SCIENCE & TECHNOLOGY

Food Packaging and Shelf Life Pub Date : 2024-06-01 DOI:10.1016/j.fpsl.2024.101300

Yali Gao , Xinlu Liu , Shuzhen Ni , Xiaoqian Chen , Yingjuan Fu , Menghua Qin

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引用次数: 0

Abstract

The insufficient bacteriostatic capacity of lignin greatly limits its application performance in the packaging and medical fields. Herein, a lignin with significantly enhanced antibacterial activity was prepared, in which PHGH (polyhexamethylene guanidine hydrochloride) was chosen to be grafted onto lignin, initiated by the glyoxal induced cross-linking. The grafting of PHGH on the lignin (PHGH-m-lignin) was confirmed by the FTIR, ¹H- and ³¹P NMR spectra. The diameter size and zeta potential of PHGH-m-LNP were evaluated. Compared with that (199.96 nm) of pristine LNP, the diameter size of PHGH-m-LNP decreased to 71.44 nm, and the zeta potential increased to − 25.6 mV from − 30.1 mV. The results of antibacterial activity showed that the PHGH-m-LNP exhibited an excellent antibacterial activity (>99.99 %) towards E.coli. AFM images disclosed the physically antibacterial mechanism of PHGH-m-LNP. For the application, different concentrations of PHGH-m-lignin nanofiller (PHGH-m-LNP) were used to fabricate starch films via casting method. The PHGH-m-LNP could confer the starch film an exceptional antimicrobial activity (antibacterial activities = 98.84 %) at the addition level of 1 % (wt). In addition, the hydrophobicity and UV shielding capacity of starch film were enhanced, with the decreased maximum thermal degradation rate. Therefore, a new way to improve the antibacterial activity of lignin is provided, which is greatly significant for boosting the high-value application potential of lignin in the packaging and medical fields.

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在木质素上接枝 PHGH 可提高抗菌活性并用作淀粉膜添加剂

木质素的抑菌能力不足极大地限制了其在包装和医疗领域的应用。本文制备了一种抗菌活性明显增强的木质素，通过乙二醛诱导交联，将 PHGH（聚六亚甲基胍盐酸盐）接枝到木质素上。傅立叶变换红外光谱、1H- 和 31P NMR 光谱证实了 PHGH 与木质素（PHGH-m-木质素）的接枝。对 PHGH-m-LNP 的直径大小和 ZETA 电位进行了评估。与原始 LNP 的直径尺寸（199.96 nm）相比，PHGH-m-LNP 的直径尺寸减小到 71.44 nm，zeta 电位从 - 30.1 mV 上升到 - 25.6 mV。抗菌活性结果表明，PHGH-m-LNP 对大肠杆菌具有极佳的抗菌活性（99.99%）。原子力显微镜图像揭示了 PHGH-m-LNP 的物理抗菌机制。在应用中，使用不同浓度的PGH-m-木质素纳米填料（PGH-m-LNP）通过浇铸法制成淀粉膜。当 PHGH-m-LNP 的添加量为 1 %（重量比）时，淀粉膜具有优异的抗菌活性（抗菌活性 = 98.84 %）。此外，淀粉膜的疏水性和紫外线屏蔽能力也得到了增强，最大热降解率降低。因此，这提供了一种提高木质素抗菌活性的新方法，对于提升木质素在包装和医疗领域的高价值应用潜力意义重大。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Food Packaging and Shelf Life Agricultural and Biological Sciences-Food Science

CiteScore

14.00

自引率

8.80%

发文量

214

审稿时长

70 days

期刊介绍： Food packaging is crucial for preserving food integrity throughout the distribution chain. It safeguards against contamination by physical, chemical, and biological agents, ensuring the safety and quality of processed foods. The evolution of novel food packaging, including modified atmosphere and active packaging, has extended shelf life, enhancing convenience for consumers. Shelf life, the duration a perishable item remains suitable for sale, use, or consumption, is intricately linked with food packaging, emphasizing its role in maintaining product quality and safety.