Optimization of Extraction of Tomato Skins Based on Antioxidant Properties
Project no. 23501 · Status: Kapanmış · 2021
Summary
<p>In parallel with the increasing world population and food consumption, food wastes show a significant increase. Agricultural wastes constitute an important potential for the global economy as they contain components that are less preferred to be consumed as food due to their low bioavailability due to their indigestion in the human body or their sensory properties, but that may be beneficial to human health such as antioxidant substances and antimicrobial agents. The benefits of using these wastes in terms of economy and reducing environmental pollution are obvious. Tomato, which is one of the most used agricultural products in our country and in the world, is processed by removing its skins in the processing of many products. Tomato skins cause serious environmental problems and economic losses if they are not evaluated. In this direction, this study aims to optimize the extraction efficiency and the antioxidant and total phenolic content of the extract according to the independent variables of temperature and time, while the alkaline extraction process applied to tomato skins is cheap and industrially applicable. Using response surface methodology, the highest extraction yield (28.77 g/100 g dry bark), the highest total phenolic content (3819.32 mg GAE/100 g dry extract), and the highest total antioxidant capacity (2737.82 µmol Trolox/100 g dry extract)were obtained under extraction conditions of 5.26 hours at 100°C.. According to LC-MS/MS results, tomato skins treated with alkali contain various phenolic acids and some flavonoids. The phenolic component found in the highest amount in the tomato peel extract was determined as p-coumaric acid (429.99 ± 38.53 mg/100 g dry extract). Other important phenolic components are ferulic acid (12.44 ± 2.06); 4-hydroxy benzoic acid (7.13 ± 1.01) and vanillin (2.47 ± 0.22) mg/100 g dry extract.</p>