Nastasi Joseph Robert, Fitzgerald Melissa A, Kontogiorgos Vassilis
School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD, Australia.
School of Agriculture and Food Sciences, The University of Queensland, Brisbane, QLD, Australia.
Int J Biol Macromol. 2023 Dec 31;253(Pt 7):127536. doi: 10.1016/j.ijbiomac.2023.127536. Epub 2023 Oct 19.
The mechanical properties of pectin films enhanced with polyphenol-rich fruit extracts were investigated. The scavenging and reducing activity of plant extracts incorporated into the pectin films were determined using bench assays, and their antioxidant activity was correlated with a high presence of polyphenols, which were predominantly comprised of flavonoids and anthocyanins. The pectin films generated from the extracts exhibited a range of mechanical properties; tensile strength (4.99 MPa - 6.91 MPa), elongation at break (45.8 % - 52.3 %), and stiffness (1835 g mm - 2765 g mm). To investigate the underlying relationships between plant extract composition and mechanical properties, Projection to Latent Structures (PLS) models were developed. The PLS models revealed that extracts containing high sugar and polyphenol content increase the tensile strength and moisture content of films. The elongation at break of the films was improved or diminished depending on the profile of sugar, acids, and polyphenols in the fruit extracts. Furthermore, the structures and concentration of anthocyanins and flavonoids were identified to strongly influenced the elongation at break differences. By modifying the concentration of sugars, organic acids, and polyphenols, the mechanical properties of pectin-based films can be tuned for tailored applications as food packaging materials.
研究了富含多酚的水果提取物增强果胶膜的机械性能。采用台式试验测定了掺入果胶膜中的植物提取物的清除和还原活性，其抗氧化活性与大量存在的多酚相关，这些多酚主要由黄酮类化合物和花青素组成。由提取物制成的果胶膜表现出一系列机械性能：拉伸强度（4.99兆帕 - 6.91兆帕）、断裂伸长率（45.8% - 52.3%）和刚度（1835克·毫米 - 2765克·毫米）。为了研究植物提取物组成与机械性能之间的潜在关系，建立了潜在结构投影（PLS）模型。PLS模型显示，含糖和多酚含量高的提取物会提高膜的拉伸强度和水分含量。膜的断裂伸长率根据水果提取物中糖、酸和多酚的分布情况而提高或降低。此外，已确定花青素和黄酮类化合物的结构和浓度对断裂伸长率差异有强烈影响。通过改变糖、有机酸和多酚的浓度，可以调整基于果胶的膜的机械性能，以满足作为食品包装材料的特定应用需求。
