Carbon dioxide expanded liquid: an effective solvent for the extraction of quercetin from South African medicinal plants von PilaÅová, Veronika, Kuda, LukáÅ, Vlcková, Hana Kocová, Nováková, Lucie, Gupta, Shubhpriya, Kulkarni, Manoj, Svec, FrantiÅ¡ek, Van Staden, Johannes, Dolezal, Karel

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