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Bibliographic record number: 579295

Journal

Authors: Horžić, Dunja; Režek Jambrak, Anet; Belščak-Cvitanović, Ana; Komes, Draženka; Lelas, Vesna
Title: Comparison of Conventional and Ultrasound Assisted Extraction Techniques of Yellow Tea and Bioactive Composition of Obtained Extracts
Source: Food and Bioprocess Technology (1935-5130) 5 (2012), 7; 2858-2870
Paper type: article
Keywords: Yellow tea; HPLC; antioxidants; extraction; ultrasound
Abstract:
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.
Project / theme: 058-0000000-3470, 058-0580696-2533
Original language: ENG
Citation databases: Current Contents Connect (CCC)
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Category: Znanstveni
Research fields:
Food processing technology
URL: http://www.springerlink.com/content/dh2369t415074214/
Broj citata:
Altmetric:
DOI: 10.1007/s11947-012-0791-z
URL cjelovitog rada:
Google Scholar: Comparison of Conventional and Ultrasound Assisted Extraction Techniques of Yellow Tea and Bioactive Composition of Obtained Extracts
Contrib. to CROSBI by: arezek@pbf.hr (arezek@pbf.hr), 8. Svi. 2012. u 12:18 sati



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