Extraction of pesticide residues in medical herbs by microwave

Microwave를 이용한 한약재 중의 잔류농약 추출

  • Kim, Taek-Kyum (Department of Agricultural Chemistry, College of Agriculture, Kyungpook National University) ;
  • Kim, Tang-Eok (Department of Agricultural Chemistry, College of Agriculture, Kyungpook National University)
  • 김택겸 (경북대학교 농과대학 농화학과) ;
  • 김장억 (경북대학교 농과대학 농화학과)
  • Published : 2000.09.30

Abstract

This study was conducted to elucidate extraction efficiency by microwave in comparison with Soxhlet for extraction of pesticide residues in dried medical herbs; red-ginseng, white-ginseng, Bupleuri Radix, Angelica gigas Nakai, Rehmannia glutinosa. The acetone extraction by microwave of tolclofos-methyl and quintozene in medical herbs was efficient. The extraction efficiency by microwave with power 45 to 150 watts, extraction time 1 to 5 minutes and solvent volume 30 ml was compared with that of Soxhlet with extraction time 7 hours and solvent volume 150 ml. The extraction efficiency by microwave with extraction time 3 to 5 minutes was similar with extraction time of 7 hours by Soxhlet. When medical herbs spiked with tolclofos-methyl and quintozene was analyzed to how the extraction efficiency of microwave by kind of medical herbs, the extraction efficiency by microwave with extraction time of 3 to 5 minutes was the same as Soxhlet extraction. The optimal condition for extraction of tolclofos-methyl and quintozene in medical herbs by microwave was 45 to 90 watts of power supply, 3 to 5 minutes of extraction time and acetone 30 ml of solvent volume.