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Comparison of Conventional and Ultrasound Assisted Extraction Techniques of Yellow Tea and Bioactive Composition of Obtained Extracts (CROSBI ID 183877)

Prilog u časopisu | izvorni znanstveni rad | međunarodna recenzija

Horžić, Dunja ; Režek Jambrak, Anet ; Belščak-Cvitanović, Ana ; Komes, Draženka ; Lelas, Vesna Comparison of Conventional and Ultrasound Assisted Extraction Techniques of Yellow Tea and Bioactive Composition of Obtained Extracts // Food and Bioprocess Technology, 5 (2012), 7; 2858-2870. doi: 10.1007/s11947-012-0791-z

Podaci o odgovornosti

Horžić, Dunja ; Režek Jambrak, Anet ; Belščak-Cvitanović, Ana ; Komes, Draženka ; Lelas, Vesna

engleski

Comparison of Conventional and Ultrasound Assisted Extraction Techniques of Yellow Tea and Bioactive Composition of Obtained Extracts

Yellow tea is the least investigated type of tea (Camellia sinensis), therefore, this study is focused on characterization of bioactive content of yellow tea extracts as well as application of inovative extraction techniques (ultrasound bath and probe) compared to conventional extraction, in water and aqueous ethanol media. Comparison of obtained extracts was based on total flavonoid (TFC) and nonflavonoid (TNC) content, HPLC analysis of individual polyphenols and methylxanthines, and antioxidant capacity. The highest TFC was detected in extracts obtained by ultrasound probe assisted extraction in aqueous ethanol as an extraction medium and the lowest in extracts obtained by ultrasound bath extraction (water and aqueous ethanol) with a trend of increase with prolonged extraction time. Conventional extraction was successful when combined with 75% aqueous ethanol as an extraction medium. Results of HPLC analysis and antioxidant capacity assays were generally in compliance with these results. This study proves that ultrasound probe extraction could succesfully be used for extraction of polyphenols and methylxanthines from yellow tea.

Yellow tea; HPLC; antioxidants; extraction; ultrasound

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Podaci o izdanju

5 (7)

2012.

2858-2870

objavljeno

1935-5130

10.1007/s11947-012-0791-z

Povezanost rada

Prehrambena tehnologija

Poveznice
Indeksiranost