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Evaluation of various clean-up sorbents in kale followed by LC-MS/MS analysis of pesticides
정영성,송노을,최지연,황선혜,구민선,남태규 한국식품과학회 2022 Food Science and Biotechnology Vol.31 No.7
Chlorophyll-rich samples, such as kale, interfere with the analysis of residual pesticides and adversely affect the integrity of tandem mass spectrometers. Dispersed solid-phase (d-SPE) extraction using graphitized carbon black effectively removes pigments from kale extracts; however, it also reduces the recoveries of 30 pesticides. To overcome this, alternative sorbents, including ENVI-Carb, ChloroFiltr, and Z-Sep+, were evaluated in this study. A sorbent combination based on 50 mg of Z-Sep+ was most advantageous (21/30), good precision (< 15%), excellent pigment removal capacity, and low matrix effect. The limit of quantification (0.0001–0.0040 mg/kg) was lower than the Korean maximum residue limits levels. The proposed method was validated according to international guidelines and applied to real kale samples. The results demonstrated that d-SPE using Z-Sep+ provides an effective strategy for ensuring mass spectrometry system integrity and improving the analytical accuracy in chlorophyll-rich samples. This is a previ
장보윤,정노을,( Rajesh Cheruku ),안광순,김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The measurement of electron diffusion coefficients and electron lifetimes of dye sensitized solar cells (DSSCs) is essentially required to characterize the cell performance, further investigate high performance solar cells. In this research, stepped light induced transient measurements (SLIM) of photocurrent and voltage is conducted to estimate the electron diffusion coefficients and electron lifetimes of DSSCs. SLIM methods is relatively simple experiment, which can simplify the optical setup and reduce measuring time. In this method, the light having different laser intensity is irradiated to the solar cells with using chopper for lighting on/off.
Pt-coated ZnO as a catalytic counter electrode for dye-sensitized solar cells
박지영,정노을,안광순,김재홍 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
DSSCs are composed of dye molecules, nanocrystalline titanium dioxide, and electrolytes containing a redox couple and counter electrode. The oxidized dye is then regenerated by electron donation from an electrolyte solution, which normally contains the iodide (I-)/triiodide (I3-) couple. This catalyst is needed to reduce the voltage loss due to chargetransfer over potential at the counter electrode. A counter electrode with high electro-chemical activity is a very important factor in achieving a high DSSC Photoconversion efficiency, maintaining a large application area.