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Gaeul Choi(최가을),Sungkuk Bae(배성국),Kwangmin Shim(심광민),Yeseop Park(박예섭),Junghwan Seo(서정환),Youkeun Oh(오유근) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Baseline drift in chromatography data often results in degraded quantitative analysis results. Baseline correction is required in order to achieve higher accuracy. It is difficult, however, to correct the baseline when its signal-to-noise ratio (SNR) is low or when the baseline drift occurs. This study proposes an algorithm to identify the correct baseline using the moving standard deviation and penalized least squares(PLS). The proposed method can be applied to noisy chromatographic data or even to any non-stationary data. This method calculates the moving standard deviation of data and identifies the points above the user-defined threshold. The initial weight vector of PLS for the corresponding points is initialized with the value of zero. The accurate baseline can be determined through the PLS method in an iterative manner. The performance of this method can be evaluated by comparing its root-mean-square error (RMSE) with other previous methods.
마약감지용 액상 시료 MEMS 샘플러 통합형 마이크로 가스 크로마토그래피 시스템 개발
배성국(Bae Sung kuk),심광민(Kwangmin Shim),박예섭(Yeseop Park),최가을(Gaeul Choi),오유근(Youkeun Oh),서정환(Jung Hwan Seo) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.11
Recently, a microfabricated gas chromatography (μGC) has emerged as one of the key technologies for the onsite hazardous gas mixture detection. However, there have been little research papers so far in the drug research field since a preconcentrator, one of the main components consisting of the existing μGC, is developed to adsorb gas-phase volatile or semi-volatile compounds while the vapor pressures of most drugs are extremely low. Here, in this study, we introduce our micro GC system capable of onsite detection of narcotic constituents in the solution. In order to realize the liquid sampling of the drug solution using our GC system, we have developed a MEMS liquid drug sampler which is compatible with a micro GC system. Our experimental results have demonstrated that our portable micro GC system integrated with the MEMS liquid sampler could achieve high chromatogram resolutions for the analytes in the narcotics solution.