Dechlorophyllation by Electrocoagulation

Abstract

Electrocoagulation was used for dechlorophyllation of alcoholic extracts from five plants. The results showed that for every plant extract studied, electrocoagulation was more efficient than the classical solvent extraction method in removing plant pigments, while not affecting the important secondary metabolites in those extracts.

Comparison between electrocoagulation and solvent extraction method in the process of the dechlorophyllation of alcoholic extracts from Moroccan medicinal plants Petroselinum crispum, Thymus satureioides and microalgae Spirulina platensis

“…It seems that dechlorophyllation by EC is more efficient than the conventional solvent fractionation method for all of the plants studied and the variations in absorbance are important between the two techniques. Our results are in accordance with the result previously reported in the literature by Kanlaya et al [45] while working on the dechlorophyllation of alcoholic extracts from five plants (Solanum laciniatum, Andrographis paniculata, Stevia rebaudiana, Centella asiatica, Cassia siamea) by EC.…”

Solvent Effects in Electrocoagulation of Selected Plant Pigments and Tannin

“…Thus, for example, when the alcoholic extract of the leaves of Solanum laciniatum, which contain solasonine (an important starting compound for steroid synthesis), was subject to decolourisation by electrocoagulation, typical results as shown in Figure 6 (for the yellow pigments) and Figure 7 (for the green pigments) were obtained. Importantly, however, it has been shown by our group that even with this general decreased efficacy of the pigment removal, electrocoagulation is still more efficient than the conventional method of extraction with organic solvents and does not affect the desired natural products, which were subsequently isolated [21]. Another important class of plant pigments is the phenolic substances, which include the tannins, the flavonoids, and the various quinone compounds.…”

Removal of chlorophyll and tannins from Anthocleista schweinfurthii Gilg leaves by electrocoagulation using iron electrodes: optimization using response surface methodology

“…In addition, organic solvents used during the extraction by conventional methods are in most cases harmful to human beings and the environment. In fact, when they are rejected after use, these solvents are a source of secondary pollution . Therefore, it would be attractive to find cheaper and eco‐friendly processes which can eliminate successfully chlorophyll and tannins, and produce the best quantities of bioactive compounds from the extracts.…”

“…Electrocoagulation is an electrochemical and environmentally friendly process capable to remove the pigments from plants without the use of enormous quantities of organic solvents . Several works on the isolation and recovery of some metabolites in the plants extracts by electrocoagulation have been already carried out . Few researches have been devoted to tannins removal and chlorophyll removal (CR) .…”