Journal of the Korean Society of Food Science and Nutrition (한국식품영양과학회지)

The Korean Society of Food Science and Nutrition (한국식품영양과학회)
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A Study on the Mineral Contents of Dolwoe Tea(Gynostemma pentaphyllum Makino)

돌외차(Gynostemma pentaphyllum Makino)의 무기성분에 관한 연구

  • Park, Young-Hee (Department of Food Science and Nutrition, Chonam National University) ;
  • Hong, Youn-Ho (Department of Food Science and Nutrition, Chonam National University) ;
  • Park, Won-Ki (Department of Food Science and Nutrition, Chosun University)
  • 박영희 (전남대학교 식품영양학과) ;
  • 홍윤호 (전남대학교 식품영양학과) ;
  • 박원기 (조선대학교 식품영양학과)
  • Published : 1987.05.30
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Abstract

The mineral content of Dolowe, which were prepared in the laboratory and marketed Korean products of Dolwoe, Japanese product of Dolwoe and Korean-roasted products of Dolwoe were analysed and compared. Dolwoe-leaf tea had high mineral content of Ca, Mg, Mn and Cu, while Dolwone-stem tea had high mineral content of K, Na and Fe. Especially in the ash of Dolwoe-stem tea showed the highest mineral content of K (33.4%) Dolwoe teas were extracted for 5 minutes as ratio of $1,000m{\ell}$ boiling water to 4g Dolwoe tea (250: 1, v/w). Comparing the ratio of extraction of minerals in Dolwoe tea made by us and marketed Dolwoe products, K was the most abundant element of all extractions with the rate of $83.2%{\sim}96.3%$ followed by Mg with $44.8%{\sim}62.2%$, Ca with $23.1%{\sim}64.4%$ and Na with $6.3%{\sim}55.6%$. On the other hand Mn, Fe and Cu were extracted in extremely small quantities.

돌외를 채취해서 잎과 줄기로 나누어 각자 실험실에서 차로 제조한 것과 제품으로 시판되고 있는 국산품과 일본산 제품 및 국산품 볶은것에 대해 무기성분의 함량을 측정하고 비교하였다. 돌외차에 함유된 무기성분은 잎에서 Mg, Mn, Ca 및 Cu의 함량이 많았고 줄기에서 K, Na 및 Fe이 많이 함유되어 있었으며 특히 줄기중 총회분의 K의 함량이 33.4%로서 가장 높았다. 제조된 돌외차와 시판제품에서 차 4g을 $1{\ell}$의 끓는물에 넣어 5분간 우려냈을 때 무기성분의 침출율은 K이 $83.2{\sim}96.3%$로 가장 높았으며 다음 Mg이$44.8{\sim}62.2%$ 이었고 Ca은 $23.1{\sim}64.4%$, Na은 $6.3{\sim}55.6%$ 순이었으나 Mn, Fe 및 Cu등은 극히 미량만 침출되었다.

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