Abstract
Some representative quinones, viz. one naphthoquinone (plumbagin) and five anthraquinones (alizarin, purpurin, chrysazin, emodin, and anthrarufin), were subjected to electrocoagulation. It was found that the rate and extent of coagulation of these compounds appears to correlate with the number and relative position of their phenolic substituent groups, and that all of the coagulated quinones could be recovered. Attempts were then made to electrochemically isolate three quinones, namely plumbagin, morindone and erythrolaccin, from natural sources.
Highlights
Quinones, notably naphthoquinones and anthraquinones, are among the most widely distributed natural products
We have found that electrocoagulation is far more efficient than carbon treatment in decolourising seedlac by coagulating out the yellow erythrolaccin
It has been determined that a variety of structurally different quinones were susceptible to electrocoagulation in different degrees depending on the number and position of their phenolic hydroxyl groups
Summary
Notably naphthoquinones and anthraquinones, are among the most widely distributed natural products. Alizarin, purpurin, chrysazin, emodin, anthrarufin and plumbagin (Figure 1) were separately electrocoagulated using direct current and aluminium plates as electrodes in an aqueous alcoholic solution containing sodium chloride as the supporting electrolyte.
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