Analytical Science and Technology (분석과학)

The Korean Society of Analytical Sciences (한국분석과학회)
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Analysis of gibberellic acid from fruits using HPLC/UV-vis

HPLC/UV-vis을 이용한 과일류 중의 지베렐린 산 분석

  • Received : 2012.08.23
  • Accepted : 2012.12.19
  • Published : 2013.02.25
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Abstract

Gibberllic acid ($GA_3$) is one of gibberellins (GAs) that are a class of plant growth hormones that exert profound and diverse effects on plant growth and development. $GA_3$ is essentially non-UV absorbing and is difficult to assay by UV-detector. For effective extraction of gibberellic acid from fruits by using liquid-liquid extraction, optimized pH and extraction solvent were established. The selective and sensitive derivative of $GA_3$ for HPLC/UV-vis was derivatized using phenacyl bromide, and the experimental factors, including reaction time, reaction temperature and amount of derivatizing reagent and base were investigated for the effective synthesis. The derivatized $GA_3$ with phenacyl bromide was effectively analyzed by HPLC/UV-vis. The structure of derivatized $GA_3$ was confirmed by HPLC/ESI-MS. For apple, LOD and LOQ were 0.008 mg/kg and 0.027 mg/kg, respectively. For pear, LOD and LOQ were 0.003 mg/kg, 0.012 mg/kg, respectively. The established method can be applied to more effective analysis of $GA_3$ from plant and food.

자외선 흡광도가 거의 없는 농작물의 생장 조절용 농약으로 사용되고 있는 지베렐린(GAs) 중 하나인 지베렐린 산($GA_3$)은 발색단이 미약해서 자외선 검출기를 이용하여 분석하기가 어려운 물질이다. 액체-액체 추출법을 이용하여 과일류로부터 지베렐린 산을 효과적으로 추출하기 위하여 시료의 pH와 추출용매에 대한 최적의 추출조건을 확립하고자 하였다. 페나실 브로마이드를 유도체화 시약으로 사용함으로써 자외선 검출기에 선택적이며 감도가 좋은 $GA_3$-유도체 화합물을 만들었으며, 최적의 유도체화 조건을 확립하기 위해서 반응온도 및 시간, 유도체화 시약의 양, 염기의 양 등을 변화시켜주는 실험이 수행되었다. 유도체화 된 $GA_3$는 C18 컬럼을 사용하여 방해물질이 없이 HPLC/UV-vis로 효과적으로 분석되었으며, HPLC/ESI-MS를 사용하여 유도체화된 화합물의 구조를 확인하였다. 사과의 경우, 검출한계(LOD)와 정량한계(LOQ)는 각각 0.008 mg/kg, 0.027 mg/kg로, 배의 경우, 검출한계(LOD)와 정량한계(LOQ)는 각각 0.003 mg/kg, 0.012 mg/kg로 낮은 검출한계와 정량한계를 보였다. 확립된 유도체화 방법은 과일류 중에 존재하는 $GA_3$의 효과적이고 편리한 분석에 응용될 수 있을 것이다.

Keywords

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