Phenolic profile and antioxidant capacity of Pistacia lentiscus L. leaf extract isolated with application microwave assisted extraction

Autor: Kruk, Valentina
Přispěvatelé: Elez Garofulić, Ivona
Jazyk: chorvatština
Rok vydání: 2018
Předmět:
Popis: Cilj ovog istraživanja je postupkom ekstrakcije potpomognute mikrovalovima izolirati ukupne fenole iz lista tršlje (Pistacia lentiscus L.). Parametri varirani tijekom eksperimenta su: temperatura (50 °C –70 °C), snaga (200-500 W) i vrijeme (4-12 min). Vrijeme 12 minuta, temperatura 69 °C i snaga 512 W su optimalni parametri kojima se postiže najveća koncentracija ukupnih fenola u iznosu od 108,14 mg GAE/g. Slična koncentracija ukupnih fenola dobivena je klasičnom ekstrakcijom, ali uz produženo trajanje ekstrakcije od 30 min. Identifikacija i kvantifikacija ukupnih fenola provedena je primjenom ultra djelotvorne tekućinske kromatografije s masenom spektrometrijom (UPLC-MS/MS) te je analizom identificirano ukupno 34 fenolna spoja. U najvećim koncentracijama su određeni derivati galne kiseline (606 mg/100g uzorka, digaloilkina kiselina), derivati miricetina (1782,4 mg/100g uzorka, miricetin ramnozid) i derivati kvercetina (130,9 mg/100g uzorka, kvercetina ramnozid). ORAC metodom određena je visoka antioksidacijska aktivnost ekstrakta lista tršlje (10768,2±0,07 μmol TE/L) što dokazuje visok potencijal te biljke za primjenom u prehrambenoj industriji. The aim of this study was to examine the influence of microwave assisted extraction on the yield of total phenols from Pistacia lentiscus L. leaf. Temperature (50 °C –70 °C), power (200-500 W and time (4-12 min) were varied. The highest concentration of total phenols 108,14 mg GAE/g was obtained after 12 minutes of extraction at temperature 69 °C and power 512 W. Similar concentration of total phenols was obtained with classic extraction but with prolonged time (30min). Identification and quantification of total phenols has been implemented with UPLC-MS/MS and 34 phenolic compounds were identified. Derivates of galic acid, mircetin and kvercetin were defined at the highest concentration. High antioxidant activity of the Pistacia lentiscus L. leaf extract (10768,2±0,07 μmol TE/L) was determined by the ORAC method proves its high potential for application in food industry.
Databáze: OpenAIRE