Screw press extraction and ultrafiltration of flavonoids from kalanchoe leaves and stems

Knud Villy Christensen*, Christian Emil Dyrkær Christiansen, Peter Brilner Lund, Rime El-Houri

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Abstrakt

Kalanchoe leaves and stems contain flavonoids known to have anti-inflammatory, anti-microbial and anti-allergenic properties of interest for use in cosmetics and pharmaceuticals. The present study investigates the aqueous extraction of flavonoids from the leaves and stems of kalanchoe hybrids. The extraction process consisted of screw pressing followed by aqueous batch extraction, microfiltration using tubular 0.2 μm polypropylene membranes, 20 kDa polyethersulfone flat sheet membranes and 1 kDa composite fluoropolymer membranes. The experiments showed that the screw press efficiently separated the kalanchoe leaves and stems into a solid fraction with a dry matter content of 14 % and a liquid fraction with a dry matter content of 2.4 %. Approximately two thirds of the flavonoids were in the liquid phase after the initial pressing. The batch extraction time was found to be 3 hours to achieve maximum flavonoid concentration. The combination of microfiltration and ultrafiltration could produce a liquid fraction rich in flavonoids. However, the proposed combination of membranes and cleaning procedures are not optimal and needs further development.

OriginalsprogEngelsk
BogserieChemical engineering transactions
Vol/bind74
Sider (fra-til)211-216
ISSN1974-9791
DOI
StatusUdgivet - 31. maj 2019
Begivenhed14th International Conference on Chemical and Process Engineering - RoyalCarlton Hotel, Via Montebello 8, Bologna, Italien
Varighed: 26. maj 201929. maj 2019
Konferencens nummer: 14
http://www.aidic.it/icheap14/

Konference

Konference14th International Conference on Chemical and Process Engineering
Nummer14
LokationRoyalCarlton Hotel, Via Montebello 8
LandItalien
ByBologna
Periode26/05/201929/05/2019
Internetadresse

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