Isolation of gallic acid, caffeine and flavonols from black tea by on-line coupling of pressurized liquid extraction with an adsorbent for the production of functional bakery products

Author(s)

Souza, Mariana C. ^[1] ; Santos, Mariana P. ^[1] ; Sumere, Beatriz R. ^[1] ; Silva, Laise C. ^[1] ; Cunha, Diogo T. ^[1] ; Martinez, Julian ^[2] ; Barbero, Gerardo F. ^[3] ; Rostagno, Mauricio A. ^[1]

Affiliation

^[1] Univ Estadual Campinas, UNICAMP, Sch Appl Sci, Rua Pedro Zaccaria 1300, BR-13484350 Limeira, SP - Brazil

^[2] Univ Estadual Campinas, UNICAMP, Sch Food Engn, Rua Monteiro Lobato 80, BR-13083862 Campinas, SP - Brazil

^[3] Univ Cadiz, IVAGRO, Dept Analyt Chem, Avd Republ Saharaui, Cadiz 11510 - Spain

• Document type: Journal article
• Source: LWT-FOOD SCIENCE AND TECHNOLOGY; v. 117, JAN 2019.
• Web of Science Citations: 0

Abstract

The objective of this work was to evaluate the on-line coupling of pressurized liquid extraction with an adsorbent for the simultaneous extraction and separation of flavonols of black tea, producing a concentrated extract that could be used as ingredient for the production of functional bakery products. After the evaluation of different adsorbents, extraction temperatures and solvents, a two-stage process was developed which was capable of producing three extracts: one with high concentration of gallic acid (78.97 +/- 5.49 mg/L), another one with high concentration of caffeine (109.72 +/- 3.15 mg/L) and a highly concentrated flavonol extract (322.0 +/- 4.50 mg/L). The developed method uses greener solvents (water and ethanol) and is capable of producing higher flavonol (similar to 50%) yields than conventional methods. The introduction of the flavonol extract in the dough can be used for the development of functional bakery since compounds were stable under processing conditions. (AU)

• FAPESP's process: 16/20016-7 - Extraction of bioactive compounds from husks of pomegranate (Punica granatum L.) using pressurized liquids assisted by ultrasound
• Grantee: Mariana Pacífico dos Santos
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 16/19930-6 - Evaluation of the extraction with pressurized liquid assisted by ultrasound coupled to the solid phase extraction for the purification of phenolic compounds from tea (Camellia sinensis)
• Grantee: Mariana Corrêa de Souza
• Support Opportunities: Scholarships in Brazil - Master
• FAPESP's process: 18/17089-8 - Separation of bioactive compounds from black tea and mate by on-line coupling of pressurized liquid extraction with an adsorbent and evaluation of their antimicrobial potential
• Grantee: Mariana Corrêa de Souza
• Support Opportunities: Scholarships in Brazil - Doctorate (Direct)