KR101293968B1 - 은 이온 검출용 올리고뉴클레오티드 고정 마이크로 오실레이터 및 이의 공진을 이용한 은 이온 검출방법 - Google Patents
은 이온 검출용 올리고뉴클레오티드 고정 마이크로 오실레이터 및 이의 공진을 이용한 은 이온 검출방법 Download PDFInfo
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- KR101293968B1 KR101293968B1 KR1020120057409A KR20120057409A KR101293968B1 KR 101293968 B1 KR101293968 B1 KR 101293968B1 KR 1020120057409 A KR1020120057409 A KR 1020120057409A KR 20120057409 A KR20120057409 A KR 20120057409A KR 101293968 B1 KR101293968 B1 KR 101293968B1
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Abstract
Description
도 2는 본 발명에 따른 마이크로-오실레이터 표면상에 시토신으로 구성된 올리고뉴클레오티드의 고정화를 확인한 광학 현미경 이미지(도 2a, 도2b) 및 형광 현미경 이미지(도 2c, 도 2d)이다.
도 3은 DNA가 (a) 결합되지 않은 본래 상태의 오실레이터 표면, (b) DNA가 고정화된 오실레이터 표면, (c) 은 이온과 시토신이 결합된 경우의 오실레이터 표면에 대한 탭핑 모드 AFM 이미지 및 (d) 각 상태에서의 입자 크기 이력을 보여주는 그래프이다.(탭핑 모드 상은 7 ㎛ × 7 ㎛이다)
도 4는 본 발명의 일 실시예에 따른 은 이온의 농도(청색 막대)에 따라 본 발명의 은 특이성 DNA 코팅 오실레이터의 정규화된 공진 주파수 이동을 보여주는 그래프이다.(회색 막대는 대조구이며, 와인색의 선은 은 이온 검출에 대한 추세선을 나타낸다.)
도 5는 본 발명의 일 실시예에 따라 은 이온의 선택도를 확인한 데이터 그래프로서, 은 이온은 회색막대, 다른 경쟁이온(리튬, 아연, 철, 나트륨)은 녹색막대로 표시한 그래프이다.(농도 100 nM)
도 6은 (a) 상수도(녹색 사각형) 및 100 nM의 은 이온이 용해된 상수도(청색 사각형)에서의 은 이온 특이성 뉴클레오티드 코팅 오실레이터의 공진 주파수이고, (b) 각 상태에 대한 은 이온 특이성 뉴클레오티드 코팅 오실레이터의 정규화된 공진 주파수이다.
도 7은 시토신 분자의 첨가를 하지 않은 경우(즉, 증폭기가 없는 경우, 녹색 상자)와 시토신 분자를 첨가한 경우(즉, 증폭기가 있는 경우, 청색 상자)에 본 발명의 은 이온 특이성 뉴클레오티드 코팅 오실레이터(SSNO)의 공진 주파수 이동 및 탭핑 모드 AFM 이미지이다.
삽입 도면은 각각 시토신 없이 Ag+ 결합상태 및 시토신과 함께의 Ag+ 결합상태의 정규화된 공진 곡선이다.
도 8은 (a) 은 이온 없는 경우의 물리적 흡착에 대한 대조 실험 결과이고, (b) AT-15 DNA 시퀀스로 수행한 은 특이성 대조 실험결과이다.
Claims (11)
- 은-이온 검출용 마이크로-오실레이터로서, 상기 마이크로-오실레이터 표면에는 말단이 티올화된 시토신으로 구성된 DNA가 부착되어 고정화되어 있고,
상기 DNA가 부착되어 고정화되는 마이크로-오실레이터의 표면은 크롬(Cr) 및 금(Au)으로 순차적으로 코팅되어 있고, 상기 금(Au)과 상기 DNA의 티올화 말단이 결합하는 것을 특징으로 하는 은-이온 검출용 마이크로-오실레이터. - 삭제
- 제 1 항에 있어서,
상기 DNA가 부착되어 고정된 마이크로-오실레이터 표면의 배면은 알루미늄으로 코팅되어 있는 것을 특징으로 하는 은-이온 검출용 마이크로-오실레이터. - 제 1 항에 있어서,
상기 DNA는 5'-(CCC)n-HS-3'(1≤n≤20)인 것을 특징으로 하는 은-이온 검출용 마이크로-오실레이터. - (a) 마이크로-오실레이터 표면에 말단이 티올화된 시토신으로 구성된 DNA를 고정화시키는 단계;
(b) 상기 마이크로-오실레이터 표면에 은 이온을 포함하는 시료와 반응시키는 단계; 및
(c) 상기 마이크로-오실레이터의 공진 주파수 변화를 실시간 측정하는 단계;를 포함하는 은-이온 검출방법. - 제 5 항에 있어서,
상기 은 이온을 포함하는 시료는 질산나트륨 및 시토신 분자를 더 포함하는 것을 특징으로 하는 은-이온 검출방법. - 제 5 항에 있어서,
상기 공진 주파수의 변화는 시토신 분자 및 포획된 은-이온의 질량에 비례하고, 상기 공진 주파수의 변화는 기준 공진 주파수와 실시간 측정한 공진 주파수의 차이인 것을 특징으로 하는 은-이온 검출방법. - 제 7 항에 있어서,
상기 기준 공진 주파수는 은-이온을 포함하지 않는 시료 내에서 측정된 마이크로-오실레이터의 공진 주파수인 것을 특징으로 하는 은-이온 검출방법. - 제 5 항에 있어서,
상기 (a) 단계 이전에 마이크로-오실레이터의 표면을 기능화시키는 단계를 더 포함하는 것을 특징으로 하는 은-이온 검출방법. - 제 9 항에 있어서,
상기 기능화시키는 단계는 상기 마이크로-오실레이터 표면을 크롬(Cr) 및 금(Au)으로 순차적으로 코팅하고, 배면은 알루미늄으로 코팅하여 기능화시키는 것을 특징으로 하는 은-이온 검출방법. - 제 5 항에 있어서,
상기 DNA는 5'-(CCC)n-HS-3'(1≤n≤20)인 것을 특징으로 하는 은-이온 검출방법.
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