Polyphenols from Red Vine Leaves Using Alternative Processing Techniques
- The extraction kinetics of polyphenols, which are leached from red vine leaves, are studied and evaluated using a laboratory robot and nonconventional processing techniques such as ultrasonic (US)-, microwave (MW)-, and pulsed electric field (PEF)-assisted extraction processes. The robotic high-throughput screening reveals optimal extraction conditions at a pH value of 2.5, a temperature of 56 °C, and a solvent mixture of methanol:water:HCl of 50:49:1 v/v/v. Nonconventional processing techniques, such as MW- and US-assisted extraction, have the fastest kinetics and produce the highest polyphenol yield. The non-conventional techniques yield is 2.29 g/L (MW) resp. 2.47 g/L (US) for particles that range in size from 450 to 2000 µm and 2.20 g/L (MW) resp. 2.05 g/L (US) for particles that range from 2000 to 4000 µm. PEF has the lowest yield of polyphenols with 0.94 g/L (450–2000 µm), resp. 0.64 g/L (2000–4000 µm) in comparison to 1.82 g/L (2000 to 4000 µm) in a standard stirred vessel (50 °C). When undried red vine leaves (2000 to 4000 µm) are used the total phenol content is 1.44 g/L with PEF.
Author: | Simone BachtlerORCiD, Hans-Jörg Bart |
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URN: | urn:nbn:de:hbz:386-kluedo-57608 |
ISSN: | 2227-9717 |
Publisher: | MDPI |
Document Type: | Article |
Language of publication: | English |
Date of Publication (online): | 2018/12/12 |
Year of first Publication: | 2018 |
Publishing Institution: | Technische Universität Kaiserslautern |
Date of the Publication (Server): | 2019/10/22 |
Issue: | 6(12) |
Page Number: | 15 |
Source: | https://www.mdpi.com/2227-9717/6/12/262/htm |
Faculties / Organisational entities: | Kaiserslautern - Fachbereich Maschinenbau und Verfahrenstechnik |
DDC-Cassification: | 6 Technik, Medizin, angewandte Wissenschaften / 620 Ingenieurwissenschaften und Maschinenbau |
Collections: | Open-Access-Publikationsfonds |
Licence (German): | Zweitveröffentlichung |