Korean Journal of Medicinal Crop Science (한국약용작물학회지)

The Korean Society of Medicinal Crop Science (한국약용작물학회)
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Effect of Drying Temperature on High Quality Functional Processed Products of Chinese Matrimony Vine

가공용 소재로서 구기자나무 잎의 건조온도 조건

  • Ju, Jung Il (Cheongyang Boxthorn Experiment Station, Chungnam Agircultural Research and Extension Service) ;
  • Lee, Jeong (Research and Development Bureau, Chungnam Agircultural Research and Extension Service) ;
  • Paik, Seung Woo (Research and Development Bureau, Chungnam Agircultural Research and Extension Service) ;
  • Yun, Tug Sang (Cheongyang Boxthorn Experiment Station, Chungnam Agircultural Research and Extension Service) ;
  • Park, Young Chun (Cheongyang Boxthorn Experiment Station, Chungnam Agircultural Research and Extension Service) ;
  • Lee, Bo Hee (Cheongyang Boxthorn Experiment Station, Chungnam Agircultural Research and Extension Service) ;
  • Kim, Hyun Ho (Cheongyang Boxthorn Experiment Station, Chungnam Agircultural Research and Extension Service) ;
  • Lee, Hee Bong (College of Agriculture and Life Science, Chungnam National University)
  • 주정일 (충남농업기술원 인삼약초연구소 청양구기자시험장) ;
  • 이정 (충남농업기술원 기술개발국) ;
  • 백승우 (충남농업기술원 기술개발국) ;
  • 윤덕상 (충남농업기술원 인삼약초연구소 청양구기자시험장) ;
  • 박영춘 (충남농업기술원 인삼약초연구소 청양구기자시험장) ;
  • 이보희 (충남농업기술원 인삼약초연구소 청양구기자시험장) ;
  • 김현호 (충남농업기술원 인삼약초연구소 청양구기자시험장) ;
  • 이희봉 (충남대학교 농업생명과학대학)
  • Received : 2015.10.01
  • Accepted : 2015.11.03
  • Published : 2015.12.30
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Abstract

Background : Chinese matrimony vine (Lycium chinense Mill.) is a deciduous shrub belonging to the Solanaceae. The leaves are used as an alternative raw material replacing dried fruits associated with high production costs in many industires. The aim of this experiment was to determine the effect of drying temperature on the leaves used in the manufacture of functional products. Methods and Results : The leaves of Chinese matrimony vine were harvested when the plant height reached 60 - 70 cm in the spring and treated at four different temperatures ($40^{\circ}C$, $50^{\circ}C$, $60^{\circ}C$ and $70^{\circ}C$). The time to reach the desiccation state of 20% was 63 h at $40^{\circ}C$, 37 h at $50^{\circ}C$, 17 h at $60^{\circ}C$ and 11 h at $70^{\circ}C$. The drying rate per hour was 1.28% at $40^{\circ}C$, 2.25% at $50^{\circ}C$, 4.94% at $60^{\circ}C$ and 7.60% at $70^{\circ}C$. No significant difference were observed in ash, crude fat, polyphenol or rutin content of treated samples. Crude protein and betaine content decreased with higher dry temperatures. Nitrogen free extract of the treated samples increased with higher drying temperatures. Conclusions : Taking into consideration drying time, drying rate, color value, energy consumption and functional ingredients is advantageous to dry the leaves of the Chinese matrimony vine at $60^{\circ}C$ using a hot air agricultural dryer.

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