Valuable Natural Antioxidant Products Recovered from Tomatoes by Green Extraction

Molecules. 2022 Jun 29;27(13):4191. doi: 10.3390/molecules27134191.

Abstract

Lycopene, β-carotene and ω-fatty acids are major compounds in tomatoes with known antioxidant activity, capable of preventing health disorders. The identification of potential natural sources of antioxidants, extraction efficiencies and antioxidant activity assessments are essential to promote such products to be used in the food, pharmaceutical or cosmetic industries. This work presents four added-value products recovered from tomatoes: pigmented solid oleoresin, pigmented oil and two raw extracts from supercritical and Soxhlet extraction. Different parameters including the matrices of tomatoes, extraction methods, green solvents and operating parameters were varied to obtain extracts with different qualities. Extract analysis was performed using UV-VIS, FT-IR, GC-MS, Folin-Ciocalteu and DPPH methods. The highest-quality extract was the solid oleoresin obtained from pomace using supercritical CO2 extraction at 450 bar, 70 °C and 11 kg/h: 1016.94 ± 23.95 mg lycopene/100 g extract, 154.87 ± 16.12 mg β-carotene/100 g extract, 35.25 ± 0.14 mg GAE/g extract and 67.02 ± 5.11% inhibition DPPH. The economic feasibility of the three extraction processes (1:10:100 kg dried pomace/batch as scalability criterion) was evaluated. The most profitable was the supercritical extraction process at the highest capacity, which produces pigmented solid oleoresin and oil with high content of lycopene valorized with a high market price, using natural food waste (pomace).

Keywords: antioxidants; economic analysis; green solvents; lycopene; supercritical CO2 extraction; tomato oil; β-carotene; ω fatty acids.

MeSH terms

  • Antioxidants / chemistry
  • Antioxidants / pharmacology
  • Biological Products* / pharmacology
  • Food
  • Lycopene
  • Plant Extracts / chemistry
  • Refuse Disposal*
  • Solanum lycopersicum*
  • Spectroscopy, Fourier Transform Infrared
  • beta Carotene

Substances

  • Antioxidants
  • Biological Products
  • Plant Extracts
  • beta Carotene
  • Lycopene

Grant support

M.P., P.I., V.P. and C.S.B acknowledge the financial support of the European Commission through the European Regional Development Fund and of the Romanian state budget, under the Grant Agreement 155/25.11.2016 (Project POC P-37-449, acronym ASPiRE).