• Bulletin of the Korean Chemical Society
• /
• 제31권2호
• /
• pp.401-405
• /
• 2010

The Schiff base 1,2-bis(E-2-hydroxy benzylidene amino)anthracene-9,10-dione has been synthesized and explored as ionophore for preparing PVC-based membrane sensors selective to the copper ($Cu^{2+}$) ion. Potentiometric investigations indicate high affinity of these receptors for copper ion. The best performance was shown by the membrane of composition (w/w) of ionophore: 1 mg, PVC: 33 mg, DOP: 66 mg and KTpClPB as additive were added 50 mol % relative to the ionophore in 1 ml THF. The proposed sensor's detection limit is $2.8{\times}10^{-7}$ M over pH 5 at room temperature (Nernstian slope 31.76 mV/dec.) with a response time of 15 seconds and showed good selectivity to copper ion over a number of interfering cations.

• 약학회지
• /
• 제39권1호
• /
• pp.61-67
• /
• 1995

PVC membrane electrodes based on the lipophilic neutral carrier, dibenzo-18-crown-6, cyclic oligomers of teit-butylphenol-formaidehyde condensates, calix[4]arenes as the active sensors for verapamil have been prepared and tested in a variety of plasticizers. At pH 5.0, the electrode exhibits a Nernstian response in the range of 10$^{-2}$~5$\times$10$^{-5}$ M verapamil with a slope of 49.1$\pm$0.5mV per concentration decade. The electrode constructed in this work can be used continuously for at least 1 month before any damage to the membrane occurs. And the analyses of the local anesthetic amine, which are good to select a specific compound in a mixed solution, were also accomplished by using of another neutral carrier, a DB18C6, for comparing with calix[4]arene.

• 공업화학
• /
• 제24권5호
• /
• pp.443-455
• /
• 2013

혼합되지 않는 두 용액 사이의 계면(interface between two immiscible electrolyte solutions, ITIES)에서의 전하 이동 반응에 대한 전기화학적 연구는 이온 검출용 센서, 바이오센서, 생체막 모델링, 약물 전달 반응, 상전이 촉매반응, 연료 생성, 태양에너지 전환 등을 포함한 다양한 연구 분야에 적용이 가능하기 때문에 크게 주목받고 있다. 특히 ITIES에서의 이온 전이 반응을 이용하여 이온물질 및 생물질 등을 검출할 수 있는 센서로 개발하기 위해 불안정한 ITIES의 한 쪽 액체층을 젤(gel)화하여 안정화하고, 마이크로 계면 형성을 통해 전압강하를 최소화 시키는 등의 연구가 활발하게 이루어졌다. 본 총설에서는 ITIES 계면에서의 이온 전이 반응을 이용하여 개발된 다양한 센서의 원리와 응용 및 발전 가능성에 대해 다루고자 한다. ITIES 계면을 (i) 보편적인 액체/액체 계면형, (ii) 마이크로피펫 팁형, (iii) 고분자 박막에 형성된 단일 마이크로홀 또는 마이크로홀 어래이형 및 (iv) 실리콘 기판에 제작된 마이크로홀 어래이형으로 분류하고, 이들 계면에서의 직접적인 이온 전이 반응과 보조 이온 전이 반응을 활용하여 수질 환경 오염의 원인이 되는 이온 및 농약 성분을 선택적으로 검출할 수 있는 이온 선택성 센서와 생물질을 분석할 수 있는 바이오센서 개발 연구에 대해 초점을 두고 소개하려 한다.

• Bulletin of the Korean Chemical Society
• /
• 제33권11호
• /
• pp.3625-3628
• /
• 2012

Fluorescent organic molecules that respond to changes in the $Fe^{2+}$ concentration with selectivity to other abundant di-valent metal ions will offer the ability to understand the dynamic fluctuations of the $Fe^{2+}$ ion in interesting media. The use of 6-Br-ppmbi, derived from 2-pyridin-2-yl-benzimidazole, for metal ion-selective fluorescence recognition was investigated. Screening of the main group and transition metal ions showed exclusive selectivity for $Fe^{2+}$ ions even in the presence of competing metal ions. In addition, the requirement for low concentrations of probe molecules to detect certain amounts of $Fe^{2+}$ ions make this sensor unique compared to previously reported $Fe^{2+}$ ion sensors.

• Bulletin of the Korean Chemical Society
• /
• 제34권9호
• /
• pp.2577-2582
• /
• 2013

A novel stick-shaped portable sensing device featuring a microhole array interface between the polyvinylchloride-2-nitrophenyloctylether (PVC-NPOE) gel and water phase was developed for in-situ sensing of perchlorate ions in real water samples. Perchlorate sensitive sensing responses were obtained based on measuring the current changes with respect to the assisted transfer reaction of perchlorate ions by a perchlorate selective ligand namely, bis(dibenzoylmethanato)Ni(II) (Ni(DBM)2) across the polarized microhole array interface. Cyclic voltammetry was used to characterize the assisted transfer reaction of perchlorate ions by the $Ni(DBM)_2$ ligand when using the portable sensing device. The current response for the transfer of perchlorate anions by $Ni(DBM)_2$ across the micro-water/gel interface linearly increased as a function of the perchlorate ion concentration. The technique of differential pulse stripping voltammetry was also utilized to improve the sensitivity of the perchlorate anion detection down to 10 ppb. This was acquired by preconcentrating perchlorate anions in the gel layer by means of holding the ion transfer potential at 0 mV (vs. Ag/AgCl) for 30 s followed by stripping the complexed perchlorate ion with the ligand. The effect of various potential interfering anions on the perchlorate sensor was also investigated and showed an excellent selectivity over $Br^-$, $NO_2{^-}$, $NO_3{^-}$, $CO{_3}^{2^-}$, $CH_3COO^-$ and $SO{_4}^{2^-}$ ions. As a final demonstration, some regional water samples from the Sincheon river in Daegu city were analyzed and the data was verified with that of ion chromatography (IC) analysis from one of the Korean-certified water quality evaluation centers.

• Journal of Electrochemical Science and Technology
• /
• 제2권3호
• /
• pp.143-145
• /
• 2011

Metal-binding antibiotics are very attractive choices as cation selective ionophores. The ability of tetracycline (TC) antibiotics to bind to metal ions has obtained much attention. TCs exhibit the potentiometric performance changes for various cations dependant on several experiment conditions. In this report, we investigated the potentiometric performance changes of TC as the modification of TC's possible metal binding site. We found that the selectivity alter with the blocking main binding site of ionophores for cations. And, additionally it is possible to control the selectivity of sensors with chemical modification of ionophores.

• 공업화학
• /
• 제30권6호
• /
• pp.737-741
• /
• 2019

본 연구에서는 스크린 프린팅 공정을 이용하여 저렴하고 유연한 칼륨 이온(K⁺) 센서를 제작하였다. 전도성 잉크의 균일한 코팅은 주사 전자 현미경 및 광학 현미경 측정에 의해 입증되었다. K⁺ 센서는 높은 감도, 빠른 응답 시간, 낮은 검출 한계를 보여주었다. 제조된 K⁺ 센서의 감도는 기계적으로 구부러진 상태에도 여전히 유지되었다. 히스테리시스 효과가 없는 우수한 반복성과 우수한 장기 안정성이 K⁺ 센서의 전기화학적 특성 분석에서 관찰되었다. 또한, K⁺ 센서는 다른 간섭 양이온이 존재하는 경우에도 정확하게 K⁺ 농도를 측정 할 수 있어 우수한 선택성을 증명하였다. 또한, 실제 스포츠 음료 샘플에서 K⁺ 농도의 성공적인 측정은 K⁺ 센서의 K⁺ 농도 값과 상용 K⁺ 미터를 비교하여 증명되었다.

• Bulletin of the Korean Chemical Society
• /
• 제27권6호
• /
• pp.899-902
• /
• 2006

The complexation of N,N'-4,5-(ethylenedioxy)benzenebis(salicylideneimine), (salphen$H_2$) with uranyl ion was studied in acetonitrile solution spectrophtometrically, and the formation constant of the resulting 1 : 1 complex was evaluated. The salphen$H_2$ ligand was used as an ionophore in plasticized poly(vinyl chloride) (PVC) matrix membrane sensor for uranyl ion. The prepared sensors exhibited a near Nernstian response, 28.0-30.9 mV/decade for uranyl ion over the concentration range $1.0\;{\times}\;10^{-2}$ to $1.0\;{\times}\;10^{-6}$M with a limit of detection of $3.2\;{\times}\;10^{-7}$ M. The proposed electrode could be used at a working pH range of 1.5 - 4.0.

• Korean Chemical Engineering Research
• /
• 제53권2호
• /
• pp.243-246
• /
• 2015

색센서는 액상 내 존재하는 특정 물질에 대하여 선택적인 색상변화를 통하여 대상물질을 검지할 수 있다. 기존 유기염료를 이용한 색센서는 단일종의 중금속 이온만을 검지한다는 단점이 있지만, 디티존(dithizone, DTZ)은 최소 5개 이상의 중금속 이온을 서로 다른 색상 변화로 검지해 낼 수 있다는 장점이 있다. 즉 다중검지용 색센서 물질로 사용할 수 있다. 그러나 디티존은 액상에서 주로 사용되어서 종이나 분말형태로 제조된 사례가 없어서 활용범위가 제한적이다. 이에 본 연구에서는 폴리스티렌(polystyrene, PS)과 디티존을 결합시켜 DTZ/PS 펠렛을 제조하여 10가지 중금속 이온에 대한 선택적인 색상변화를 관찰하였다. 제조한 DTZ/PS 펠렛에 대하여 10 ppm의 중금속 이온의 노출 결과, 수은과 코발트가 뚜렷한 색상 변화를 보였으며 선택적인 중금속 이온 검지에 활용할 수 있음을 확인하였다.

• Bulletin of the Korean Chemical Society
• /
• 제29권1호
• /
• pp.165-167
• /
• 2008

The performances of tetracycline based cation selective polymeric membrane electrodes of many sets with different plasticizers were investigated as the selectivity of ion-selective electrodes and optodes are greatly influenced by membrane solvent and also controlled by plasticizers. The membrane 1 with Bis(2-ethylhexyl) sebacate (DOS) and additive shows good potentiometric performance toward Ca2+ (slope: 27.8 mV per decade; DL: -4.52) including selectivity. Contrastingly, membrane 4 with Dibutyl phthalate (DBP) shows near-Nernstian response, it has also shown the best measuring range and detection limit for Ca2+ (29.5 mV and -5.10) and Mg2+ (24.4 mV and -5.04) and the least selectivity has been also observed between Ca2+ and Mg2+. When the membrane 1 and 4 were used together to flow system, we could determine the concentration of Ca2+ and Mg2+, simultaneously.