Ultrasonic-assisted extraction and thermal stability of phytochemicals from fenugreek leaves      
Yazarlar (2)
Prof. Dr. Hilal İŞLEROĞLU Tokat Gaziosmanpaşa Üniversitesi, Türkiye
Arş. Gör. İzzet TÜRKER Tokat Gaziosmanpaşa Üniversitesi, Türkiye
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayınlanan tam makale
Dergi Adı Journal of Applied Research on Medicinal and Aromatic Plants
Dergi ISSN 2214-7861 Wos Dergi Scopus Dergi
Dergi Tarandığı Indeksler SCI-Expanded
Dergi Grubu Q1
Makale Dili İngilizce
Basım Tarihi 09-2022
Cilt No 30
Sayı 1
DOI Numarası 10.1016/j.jarmap.2022.100390
Makale Linki http://dx.doi.org/10.1016/j.jarmap.2022.100390
Özet
The current investigation aimed to determine the optimum ultrasonic-assisted extraction conditions of the phytochemicals from fenugreek leaves (Trigonella-foenum graecum L.). The effects of the solvent type, sample–solvent ratio, amplitude and extraction time on total phenolic compounds, total flavonoids, antioxidant activity and total saponin content were studied with a multi-objective perspective. Quadratic models were obtained by desirability function approach and a numerical optimization study was carried out to achieve the highest amount of phytochemicals in the extracts. Further, thermal stability of the extracts produced at the optimum conditions was determined in terms of the amount of the phytochemicals at different pH values (pH 3.0–9.0). The optimum extraction conditions of the ultrasonic-assisted extraction process were 100% of water, 35.02 g/L of sample–solvent ratio, 52.63% of amplitude, and 61.73 min of extraction time. Thermal stability of the extract obtained at the optimum extraction conditions was higher at pH 3.0 than that of pH 6.0 and pH 9.0, and its antioxidant properties were preserved by ~25% even after 10 h at 60 °C.
Anahtar Kelimeler
Antioxidant activity | Fenugreek leaves | Saponin | Thermal stability | Ultrasonic-assisted extraction