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Open AccessArticle

Sodium Alginate-Based Green Packaging Films Functionalized by Guava Leaf Extracts and Their Bioactivities

1
School of Biology and Biological Engineering, South China University of Technology, Guangzhou 510006, China
2
Department of Biological Engineering, Pan Asia (Jiangmen) Institute of Biological Engineering and Health, Jiangmen 529080, China
*
Author to whom correspondence should be addressed.
Materials 2019, 12(18), 2923; https://doi.org/10.3390/ma12182923
Received: 8 August 2019 / Revised: 28 August 2019 / Accepted: 9 September 2019 / Published: 10 September 2019
The aim of this work was to develop green and bioactive films with sodium alginate incorporating guava leaf extracts. Seven formulations were performed with a different sodium alginate: Guava leaf water extract (WE)/ethanolic extract (EE) proportions (100:0, 90:10, 85:15, 80:20), and glycerol were used as a plasticizer. The HPLC-PDA analysis showed the main phenolic compounds in WE were gallic acid, ellagic acid, quercetin-3-O-β-D-xylopyranoside, avicularin and quercetin. The main polyphenols in EE were rutin, isoquercitrin, quercetin-3-O-β-D-xylopyranoside, avicularin, quercitrin, quercetin and kaempferol. Guava leaf extracts could greatly enhance the antioxidant activity, antibacterial activity, tensile strength and water solubility of the sodium alginate film as well as the water barrier property, while inducing a decrease in the moisture content and elongation at the break. The FTIR and SEM analyses indicated that intermolecular hydrogen bonding between the guava leaf extract and sodium alginate resulted in a more compact structure in the composite films. These results indicated that sodium alginate-guava leaf extract films might be developed into antiradical and antimicrobial food packaging materials. View Full-Text
Keywords: bioactive film; sodium alginate; guava leaf extract; polyphenol; antioxidant; antibacterial bioactive film; sodium alginate; guava leaf extract; polyphenol; antioxidant; antibacterial
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MDPI and ACS Style

Luo, Y.; Liu, H.; Yang, S.; Zeng, J.; Wu, Z. Sodium Alginate-Based Green Packaging Films Functionalized by Guava Leaf Extracts and Their Bioactivities. Materials 2019, 12, 2923.

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