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송봉준,유승곤,이보성 충남대학교 공업교육연구소 1986 論文集 Vol.8 No.3
The water-soluble extract of Persicaria hydropiper was investigated with respect to its insecticidal effect. Small plant parasitic insects such as Aphis and Perichaeta communissma were wholly killed within 60 min, in the aqueous solution including 1250 ppm of the water-soluble extract. This extract was passed through cation and anion resins, and the non-adsorption parts were fractionated with membrane filters. The lower molecular fraction (MW/<500) exhibited a strong insecticidal effect and a new component having R_f value of 0.24 has been observed on the TLC from this low molecular fraction.
유승곤,송봉준,이보성 충남대학교 공업교육연구소 1985 論文集 Vol.8 No.1
Water soluble components of Persicaria hydropiper have an insecticidal effect. The extraction mechanism of water solubles from Persicaria hydropiper was studied and it turned out to be a diffusion model. The diffusivity was logarithmically increased with respect to extraction temperature (20…70℃) showing the values in 0.7…2.65×10^-7 cm²/min. Some variables which have an effect on extracted quantity of water solubles were also observed. As a result, optimum operatin conditions and empirical equation were presented for the industrial scale extraction.