Ferreira Teresa, Gomes Sandra M, Santos Lúcia
FEUP-Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
ALiCE-Associate Laboratory in Chemical Engineering, Faculty of Engineering, University of Porto, Rua Dr. Roberto Frias, 4200-465 Porto, Portugal.
Antioxidants (Basel). 2023 Dec 1;12(12):2069. doi: 10.3390/antiox12122069.
Enhancing the nutritional value of commonly consumed, cost-effective staple foods, such as bread and biscuits, by fortifying them with leaf powder (MOLP) and its phenolic-rich extract holds substantial potential for addressing malnutrition. This study evaluated the phenolic extract from MOLP obtained through Soxhlet extraction, focusing on its antioxidant, antibacterial, and antidiabetic properties. The resulting extract exhibited a total phenolic content (TPC) of 138.2 mg of gallic acid equivalents/g. The ABTS and DPPH assays presented IC values of 115.2 mg/L and 544.0 mg/L, respectively. Furthermore, the extract displayed notable α-amylase inhibition and no cytotoxicity towards human fibroblasts. The primary phenolic compounds identified were catechin, epicatechin, and caffeic acid. Subsequently, MOLP and its extract were incorporated into bread and biscuits, replacing 5% of wheat flour, resulting in fortified functional foods. The fortified products exhibited improved TPC and antioxidant activity compared to the non-fortified foods. Furthermore, they displayed the ability to inhibit microbial growth, leading to an extended shelf life. Sensory analysis indicated that the products incorporated with the extract were preferred over those with MOLP. These results have demonstrated the viability of using MOLP and its phenolic-rich extract as an environmentally sustainable strategy for enhancing the quality of cereal-based products.
通过用树叶粉末(MOLP)及其富含酚类的提取物强化面包和饼干等常见、经济高效的主食的营养价值,在解决营养不良问题方面具有巨大潜力。本研究评估了通过索氏提取法从MOLP中获得的酚类提取物,重点关注其抗氧化、抗菌和抗糖尿病特性。所得提取物的总酚含量(TPC)为138.2毫克没食子酸当量/克。ABTS和DPPH测定的IC值分别为115.2毫克/升和544.0毫克/升。此外,该提取物对α-淀粉酶有显著抑制作用,且对人成纤维细胞无细胞毒性。鉴定出的主要酚类化合物为儿茶素、表儿茶素和咖啡酸。随后,将MOLP及其提取物添加到面包和饼干中,替代5%的小麦粉,制成强化功能食品。与未强化的食品相比,强化产品的TPC和抗氧化活性有所提高。此外,它们还具有抑制微生物生长的能力,从而延长了保质期。感官分析表明,添加提取物的产品比添加MOLP的产品更受欢迎。这些结果证明了使用MOLP及其富含酚类的提取物作为提高谷物类产品质量的环境可持续策略的可行性。