Naslov
Green recovery of polyphenols from nettle leaves (Urtica dioica L)

Autori
Maras, Marta ; Kruk, Valentina ; Radman, Sanja ; Dragović-Uzelac, Verica ; Bursać Kovačević, Danijela

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of abstracts of the 1st International Conference on Advanced Production and Processing / Vidović, Senka - Novi Sad : Tehnološki fakultet Univerziteta u Novom Sadu, 2019, 208-208

ISBN
978-86-6253-102-5

Skup
1st International Conference on Advanced Production and Processing (ICAPP 2019)

Mjesto i datum
Novi Sad, Srbija, 10.10.2019. - 11.10.2019

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
Nettle, Pressurized liquid extraction, Total phenolic content, Green recovery

Sažetak
Nettle (Urtica dioica L), as a wild-growing and widespread annual plant, possess a great economic potential due to its widespread application in food, pharmaceutical, animal feed and other industries. It has been used in a traditional medicine since ancient times due to the high content of various biologically active compounds, such as polyphenols which exert many pharmacological effects (i.e. antioxidative, hypoglycemic, antiviral, immunomodulatory etc.). Hence, nettle extracts are being prepared by conventional and/or novel extraction techniques (i.e. Pressurized Liquid Extraction, PLE). The advantages PLE are primarily related to shorter processing time, lower solvent consumption, higher efficiency and reduced energy costs, as well as the possibility to use "green solvents". This extraction process can compatible with the principles of green chemistry. Therefore, the aim of this study was to evaluate green extraction approach to optimize the valorization of dried nettle leaves in terms of total phenolic content (TPC) by PLE. PLE was conducted under different conditions by varying cycle numbers (1, 2, 3, 4), static times (5 and 10 min) and temperature (20 °C and 50 °C) with 96% ethanol as the generally recognized as safe and affordable extraction solvent (ASE 350, Dionex, Sunny-vale, CA, USA). The total phenolic content was estimated by Folin–Ciocalteu colorimetric method. The averages for TPC in the nettle extracts ranged from 106, 44 ± 0.11 to 739, 97 ± 0.XX mg Gallic Acid Equivalent per g of dry material. Increased static time and cycle number resulted in higher extraction yields with, the highest TPC in nettle extracts was obtained by 4 cycle process and 10 min of static times. With respect to temperature, results show a rise in TPC as extraction temperature increases (20 °C vs. 50 °C) probably due to more efficient degradation of cellular walls and easier release of bond phenolic compounds. In conclusion, PLE could be considered as an advanced and promising green approach that could overcome current limitations of conventional extraction and provide valuable nettle extracts that could find their application in industry and in emerging global markets.

Izvorni jezik
Engleski

Znanstvena područja
Prehrambena tehnologija

POVEZANOST RADA