Exploring secondary metabolites in coffee and tea food wastes

Grohar, Mariana Cecilia (author), Gačnik, Barbara (author), Mikulič Petkovšek, Maja (author), Hudina, Metka (author), Veberič, Robert (author)

Coffee and tea are popular beverages worldwide, and therefore generate large amounts of waste. Here we describe the caffeine content and phenolic profile in three types of teas and coffees, and how they vary with two successive extractions. Although the first extraction was far more efficient than the second, green tea also showed a high content of flavanols in the second extraction, as did mate tea for phenolic acids. Black tea could also be a good option since caffeine content was highest in both extractions. Water also proved to be the most effective solvent in almost all cases, which represent a major benefit for urban horticulture, as it is a simple extraction method from an easily accessible source. Coffee and tea residues are a rich source of caffeine and phenolic compounds that could potentially be used as alternatives to conventional pesticides.

• Language: English
• Keywords: caffeine, phenolic compounds, solvents, second extraction
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2021
• Number of pages: 14 str.
• Numbering: Vol. 7, iss. 11, art. 443
• PID: 20.500.12556/RUL-132751
• UDC: 543
• ISSN on article: 2311-7524
• DOI: 10.3390/horticulturae7110443
• COBISS.SI-ID: 83087363
• Publication date in RUL: 02.11.2021

Record is a part of a journal

• Title: Horticulturae
• Shortened title: Horticulturae
• Publisher: MDPI
• ISSN: 2311-7524
• COBISS.SI-ID: 526326297

Licences

• License: CC BY 4.0, Creative Commons Attribution 4.0 International
• Link: http://creativecommons.org/licenses/by/4.0/
• Description: This is the standard Creative Commons license that gives others maximum freedom to do what they want with the work as long as they credit the author.

Secondary language

• Language: Slovenian
• Keywords: kava, čaj, kemična sestava, sekundarni metaboliti, fenolne spojine, odpadek, bioaktivne snovi

Projects

• Funder: ARRS - Slovenian Research Agency
• Project number: P4-0013
• Name: Hortikultura